WO2021059084A1

WO2021059084A1 - Fluid injecting & collecting system with retractable needle operable by vacuum

Info

Publication number: WO2021059084A1
Application number: PCT/IB2020/058573
Authority: WO
Inventors: Pratibha RATHORE; Jai Hind RATHORE; Bharati RATHORE; Bhuvan Chandra RATHORE; Neelam RATHORE
Original assignee: Rathore Pratibha; Rathore Jai Hind; Rathore Bharati; Rathore Bhuvan Chandra
Priority date: 2019-09-23
Filing date: 2020-09-15
Publication date: 2021-04-01
Also published as: AU2020356502A1

Abstract

The present invention relates to a fluid injecting and collecting system. An injector of the system comprises an Injector barrel (10, 10') whose body is partitioned into two chambers by an Integrated gland (12, 12'). A Plunger shaft (30, 30') is configured to move at a central axis of the Injector barrel (10, 10'). A Fluid-cartridge of the system comprises a Fluid-cartridge barrel (50, 50') including a hollow cylindrical body having openings at both ends and a conical mouth present at a proximal end (P). Radially arranged Retention Beads (51, 51') are provided at a distal end of outer surface of the Fluid-cartridge barrel (50, 50') to firmly attach with L-shaped grooves (15, 15') of an Injector (A, A', A'', A''', A-1, and A-2). A Piston-head (60, 60') and a Needle-assembly (70, 70') including a Hypodermic Needle (74, 74') are also provided in the Fluid-cartridge barrel (50, 50').

Description

FLUID INJECTING & COLLECTING SYSTEM WITH RETRACTABLE NEEDLE OPERABLE BY VACUUM

TECHNICAL FIELD

[001] The embodiments of the disclosure relate to a Fluid injecting and collecting system consisting of a frequently reusable Injector, disposable as well as non-reusable Fluid-cartridge and Fluid-collector.

BACKGROUND

[002] Injecting systems and collecting systems have a wide range of application. A bulk of them is consumed in healthcare not only as drug delivering system but also to withdraw or collect bodily Fluids for various medical purposes.

[003] Due to sterility maintenance concerns, the injection system and the containment systems (usually vials, ampules, etc.) are used with a single patient and need to be disposed of upon completion of an injection or collection process, thus creating significant medical waste, wastage of precious drug, risk of anti-microbial resistant due to the leftout drug. Also, the needle injection configuration carries a threat of transmitting blood borne diseases like AIDS, and Hepatitis B & C, via needle stick injuries.

[004] Recent advancements have included the development and refinement of conventional systems of injecting Fluid, mostly hypodermic syringes, by incorporating various retraction mechanisms to prevent the needle stick injuries. However, they have additional shortcomings such as high manufacturing cost, no reusability, complex mechanism, chances of secondary cross-infection due to fast retraction mechanism etc. and are beyond the reach of masses. [005] Thus, there remains a need to develop a reusable fluid injector and a safely disposable fluid-cartridge.

OBJECT OF THE DISCLOSURE

[006] An object of the present disclosure is to provide a Fluid injecting system, wherein the empty or pre-filled disposable Fluid-cartridge is attachable with a frequently reusable Injector to constitute a safety syringe with Vacuum-retractable needle and operable like a conventional syringe.

[007] Another object of the present disclosure is to provide a Fluid injecting system, wherein the pre-filled disposable Capillary Fluid-cartridge is attachable with a frequently reusable Injector to constitute a safety syringe with Vacuum-retractable needle and operable like a conventional syringe.

[008] An object of the present disclosure is to provide a Fluid collecting system, wherein the empty disposable Fluid-collector is attachable with a frequently reusable Injector to constitute a safety Fluid collecting system operable like a conventional syringe.

[009] An object of the present disclosure is to provide a Fluid injecting system with Vacuum operable retractable needle mechanism consisting of Injector and Fluid-cartridge to safely inject the Fluid at the injectable site without any risk of needle stick injury.

[0010] Another object of the present disclosure is to provide a Fluid collecting system with Vacuum operable retractable needle mechanism consisting of Injector and Fluid-collector to safely collect and store the Fluid from the Fluid source without any risk of needle stick injury. [0011] Another object of the present disclosure is to provide a frequently reusable Injector and safely disposable as well as non-reusable Fluid-cartridge, wherein the used needle auto-retracts and encapsulates within the barrel of the Fluid-cartridge. [0012] Another object of the present disclosure is to provide an empty Fluid-cartridge and a fixed volume pre-filled Fluid-cartridge for replacing the barrel of the conventional syringe with provisions to attach with the injector, which further replaces the conventional packaging containers (i.e. vials, ampules, etc.), having retractable Needle- assembly containing either inbuilt or replaceable hypodermic needle or has provision to attach the hypodermic needle of desired dimensions.

[0013] Another object of the present disclosure is to provide the Injector (or Capillary Injector) having means to firmly attach with the Fluid-cartridge to constitute a Vacuum operable retractable Fluid injection system.

(i) While attaching the empty Fluid-cartridge with injector to constitute a Vacuum operable retractable Fluid injection system, the desired volume of Fluid can be aspirated conveniently from the Fluid container into the Fluid-cartridge and may be completely injected into the patient, in a conventional manner.

(ii) In case, pre-filled Fluid-cartridge is attached with injector in place of empty drug- cartridge, the resultant assembly automatically constitutes a Vacuum operable retractable Fluid injection system, ready to inject the Fluid into patient until last drop in conventional manner.

[0014] After the completion of injection procedure, the hypodermic needle automatically retracts into the empty drug-cartridge without the intervention of user, and thereafter the empty drug-cartridge with encapsulated used needle automatically detaches itself from the piston assembly of injector to render the injector ready for next injection procedure.

[0015] Another object of the present disclosure is to provide the Fluid injecting system having the Fluid collector with a needle retraction mechanism which is removably connected with the injector and is configured to collect the Fluid from the target.

[0016] Another object of the present disclosure is to provide a Fluid injecting system for micro dosage of Fluid with volume of 0.5ml or lesser, consisting of Capillary Injector and Capillary Fluid-cartridge with Vacuum operable retractable needle mechanism to safely inject the Fluid at the injectable site without any risk of needle stick injury.

SUMMARY

[0017] This summary is provided to introduce aspects related to Fluid injecting and collecting systems with retractable needle operable by Vacuum, and the aspects are further described below in the detailed description. This summary is not intended to identify essential features of the claimed subject matter nor is it intended for use in determining or limiting the scope of the claimed subject matter.

[0018] In an embodiment, an injector usable for injecting and collecting Fluid, according to the current disclosure, may comprise an Injector barrel. A body of the Injector barrel is partitioned into two chambers by an Integrated gland present at a proximal end of the Injector barrel. The injector may further comprise a Plunger shaft configured to move at a central axis of the Injector barrel. A Collar provided at a proximal end of the Plunger shaft restricts backward motion of the Plunger shaft beyond the Integrated gland of the Injector barrel. An O-ring seal-1 is embedded on a lateral and inner surface of the Integrated gland. A Ring-seal is provided at the proximal end of the Injector barrel and in contact with the Integrated gland to create a seal with a Fluid-cartridge or a Fluid-collector.

[0019] L- shaped grooves are provided at proximal end at the inner surface of the

Injector barrel to firmly hold a Fluid-cartridge or a Fluid Collector. A Finger-rest is provided at a distal end of the Injector barrel to hold the injector. A Thumb-rest is provided at a distal end of the Plunger shaft for application of force by a user. The Thumb-rest is secured upon a Threaded portion present at the distal end of the Plunger shaft.

[0020] A Plunger shaft retainer is positioned behind the Integrated gland. The Plunger shaft retainer comprises a crescent shaped Static brake-fixture present in a first semi-cylindrical portion of the Injector barrel. The Plunger shaft retainer further comprises a Dynamic brake- fixture present in a second semi-cylindrical portion of the Injector barrel. The Plunger shaft retainer further comprises a Compressible sheet sandwiched between the Static brake-fixture and the Dynamic brake-fixture. A Central passage is present within the Plunger shaft retainer for allowing axial movement of the Plunger shaft. The Dynamic brake-fixture has an inclined surface to house a Slide-switch used for controlling movement of the Plunger shaft.

[0021] A Lubricant- soaked foam is positioned next to the Integrated-gland, towards the proximal end of the Injector barrel. A Ring-seal-II is positioned at the proximal end of the Injector barrel, to create a seal with a Fluid-cartridge or a Fluid-collector. A Gland Plug is provided at a distal end of the Injector barrel. A Gland-magnet-I and a Gasket-seal are provided at an outer rim of the Gland-plug. An O-ring Seal-II is provided at an inner rim of the Gland Plug. A Support flange is provided at the distal end of the Gland plug to support airtight fixing and removing the Gland plug at the distal end of the Injector barrel.

[0022] A Piston is provided around a central point present along a length of the Plunger shaft. The Piston extends outwards, towards an inner surface of the Injector barrel and a Piston- seal is provided at an outer rim of the Piston, to form an air tight seal at the distal end of the Injector barrel. A Piston-magnet-II is provided on the Piston. The Plunger shaft is axially provided with a Capillary. A distal end of the Capillary opens outside the Injector barrel when the Plunger shaft is present in an un-pressed condition, and a proximal end of the Capillary has a conical Suction-cup.

[0023] L- shaped grooves are provided at the inner surface of the proximal end of the

Injector barrel, to firmly hold the Fluid-cartridge or Fluid Collector. A straight rod-like Needle- shaft extends from the piston towards the proximal end of the Injector barrel. A proximal end of the Needle-shaft is provided with an Attachment fixture at the tip to hold a Collapsible-bulb made of a resilient soft material to act as a collapsible piston. [0024] In another embodiment, a Fluid-cartridge, according to the present disclosure, comprises a Fluid-cartridge barrel including a hollow cylindrical body having openings at both ends and a conical mouth present at a proximal end of the Fluid-cartridge barrel. The conical mouth constitutes a Cap Retention Fixture present at an outer surface of the Fluid-cartridge barrel. The Fluid-cartridge barrel further includes radially arranged Retention Beads provided at a distal end of the outer surface of the Fluid-cartridge barrel to firmly attach with L-shaped grooves provided internally at a proximal end of an Injector. The Fluid-cartridge barrel further includes a Piston-head having a cylindrical disc shape. The Fluid-cartridge barrel further includes a Needle-assembly including a Hypodermic Needle affixed at a proximal end of the Fluid-cartridge barrel.

[0025] The Piston-head comprises an O-ring Seal present at the outer rim of the Piston- head. The Piston-head is sealingly moveable alongside the Fluid-cartridge barrel. A centrally protruded Needle Catch Projection is present at a proximal end of the Piston-head. The Needle- assembly comprises a Needle -hub with a Needle Catch Cavity at a distal end of the Needle- hub to receive and engage with the Needle Catch Projection. An axial Groove is provided alongside an inner rim of the Needle Catch Cavity. The Hypodermic Needle distally opens in the Needle Catch cavity. An inner diameter of the Needle Catch Cavity is equal to an outer diameter of Needle Catch Projection to receive and firmly engage with the Needle Catch Projection.

[0026] The Needle-hub is provided with a Collar at distal end of the outer rim to hold a Displacer O-ring seal between the Collar and an inner surface of the Fluid-cartridge barrel. An inner diameter of a distal end of the Displacer O-ring seal is larger than the outer diameter of the Collar for disengaging the Needle-hub from the O-ring seal. A Needle cover is used to guard the Hypodermic -needle. A Retention- sleeve is provided at a distal end of the Needle cover to engage with the Cap Retention-fixture of the Fluid-cartridge barrel. In one implementation, pre-filled Fluid may be stored in a space present between the Piston-head and the Needle-assembly of the pre-filled Fluid-cartridge. Further, Graduation marks are provided on a surface of a Fluid-cartridge barrel of empty Fluid-cartridge, between the Piston-head and the Needle assembly, for allowing reading of volume of a Fluid aspirated into a space present between the Piston-head and the Needle assembly.

[0027] In one embodiment, a capillary Fluid-cartridge, according to the present disclosure, comprises a hollow capillary Fluid-cartridge barrel having a Conical-mouth at a proximal end, an Axial-capillary present along a central longitudinal axis of the Fluid-cartridge barrel, a bead-shaped Piston-head provided at a distal end of the Axial-capillary, and a Needle- assembly comprising a Hypodermic Needle at a proximal end of the Axial-capillary. A distal end of the Hypodermic Needle is fixed in a Needle-hub and opens distally of the Needle-hub. The Needle-hub slides within the Axial-capillary upon movement of the bead-shaped Piston- head.

[0028] An opening at a proximal end of the Axial-capillary is provided with a Needle hub-restrictor Flange comprising an aperture, to restrict axial movement of the Needle- assembly. A fixed volume of Fluid is pre-filled between the Piston-head and the Needle -hub. Volume of the pre-filled Fluid present inside the capillary is mentioned at the surface of Fluid- cartridge Barrel. A conical Tip-guard is provided on a proximal end of the Fluid-cartridge barrel to be fixed on Retention fixture for protecting the Hypodermic needle. Proximal end of the Hypodermic Needle is closed with an End-tip bead having diameter higher than an aperture of Needle hub-restrictor Flange of the Axial capillary.

[0029] In one embodiment, a Fluid collector, according to the present disclosure, comprises a Fluid collecting Barrel having a Needle-retention Nozzle at a proximal end of the Fluid collecting Barrel. A proximal end of an axial Capillary centrally opens outside the Needle-retention Nozzle and a distal end opens in the Fluid collecting Barrel. The Fluid collector further comprises a Needle-hub removably affixed on the Needle -retention Nozzle and containing a Hypodermic Needle. The Fluid collector further comprises a Piston-head plugging a distal end of the Fluid collecting Barrel and configured to slide within the Fluid collecting Barrel upon application of force by an injector.

[0030] Conical Lock-2 present at a distal end of a Needle cover allows locking of the

Needle cover onto indentations present around the proximal end of the Fluid collecting Barrel. A Conical Lock-1 is provided at a distal end of the Needle Hub. An inner diameter of the Conical Lock-1 is equal to an outer diameter of the Needle Retention Nozzle. A radial Breakaway Seal is used to fasten the Fluid collecting Barrel with the Needle cover. The Breakaway Seal is provided with a Tab for allowing breaking and removal of the Breakaway seal. Removal of the Breakaway seal separates the Needle cover from the Fluid collecting barrel to expose the Hypodermic Needle before a Fluid collection process.

[0031] Retention-beads are provided on the distal end of the Fluid collecting Barrel for firmly engaging with L-shaped grooves of an Injector. Graduation-marks are provided on a surface of the Fluid collecting Barrel for allowing measuring volume of a Fluid filled into the Fluid collecting Barrel. The Piston-head comprises a cylindrical disc provided with O-ring Seals on outer rim of the Piston-head.

[0032] In one embodiment, a retractable injection system, according to the present disclosure, comprises an Injector barrel. A body of the Injector barrel is partitioned into two chambers by an Integrated gland present at a proximal end of the Injector barrel. A Plunger shaft is configured to move at a central axis of the Injector barrel. A Thumb-rest is provided at a distal end of the Plunger shaft. The Thumb-rest is secured at the distal end of the Plunger shaft. A Collar provided at a proximal end of the Plunger shaft restricts backward motion of the Plunger shaft beyond the Integrated gland of the Injector barrel. A Ring-seal is positioned towards the proximal end of the Injector barrel, to create a seal with a Fluid-cartridge. [0033] The retractable injection system further comprises a Fluid-cartridge. The Fluid- cartridge comprises a Fluid-cartridge barrel including a hollow cylindrical body having openings at both ends and a conical mouth present at a proximal end of the Fluid-cartridge barrel, wherein the conical mouth constitutes a Cap Retention Fixture present at an outer surface of the Fluid-cartridge barrel. The Fluid-cartridge barrel also includes radially arranged Retention Beads provided at a distal end of the outer surface of the Fluid-cartridge barrel to firmly attach with L-shaped grooves provided internally at a proximal end of the Injector. [0034] The Fluid-cartridge further comprises a Piston-head having a cylindrical disc shape. The Piston-head is centrally provided with a Needle catch projection at proximal end. The Fluid-cartridge further comprises a Needle-assembly including a Hypodermic Needle affixed at a proximal end of the Fluid-cartridge barrel. The Needle-assembly comprises a Needle-hub with a Needle Catch Cavity at a distal end of the Fluid-cartridge barrel, to receive and engage with a Needle Catch Projection present on a proximal surface of the Piston-head. Upon attachment of the Fluid-cartridge with the Injector, an air tight seal is created at a junction between the injector and the Fluid-cartridge, and an end-tip of a Plunger shaft of the injector comes in close contact of a distal surface of a Piston-head of the Fluid-cartridge.

[0035] In one embodiment, filling of Fluid into the Fluid-cartridge barrel requires: a) attaching L-shaped grooves provided internally at a proximal end of the Injector with radially arranged Retention Beads provided at a distal end of the outer surface of the Fluid- cartridge barrel; b) exposing the Hypodermic needle by removing a Needle guard and placing the Hypodermic needle embedded in the Fluid; b) exerting pressure on the Thumb-rest configured to move the Plunger shaft in a forward direction, wherein upon movement in the forward direction, the Plunger shaft pushes the Piston-head in the forward direction along- side the Injector barrel, and wherein a Vacuum develops between the Ring seal of the injector and the Piston-head of the Fluid-cartridge; and c) gradually releasing the pressure applied on the Thumb-rest, wherein gradually releasing the pressure causes movement of the Piston-head along with Plunger shaft in a backward direction due to release of the Vacuum, and wherein the Fluid is aspirated into the Fluid-cartridge with movement of the Piston-head along with Plunger shaft in the backward direction.

[0036] A volume of the Fluid aspirated into the Fluid-cartridge is identified through graduation marks provided on a surface of the Fluid-cartridge. The Fluid aspirated into the Fluid-cartridge is injected into the injection site by applying force on the Thumb-rest. Upon injecting entire quantity of the Fluid into injection site during injection procedure, the Needle- catch-projection gets inserted into the Needle-catch cavity and attaches the Needle -hub along with Hypodermic-needle, and the Displacer O-ring slides in forward direction to set the Collar of Needle -hub free. Thereupon, the Needle -hub containing the Hypodermic -needle freely moves in the backward direction due to release of the Vacuum on gradually releasing the force applied on the Thumb rest.

[0037] Upon backward movement, the Needle -hub along with the used Hypodermic- needle retracts into the empty Fluid-cartridge and safely encapsulates therein for separation from the Injector and safe disposal; and the Plunger shaft attains initial state to bring the Injector ready for a next injection procedure. When the Needle-catch-projection begins entering into the Needle-catch cavity, the Fluid trapped between the Piston-head and the Needle-hub passes through a Needle-cavity groove provided alongside the inner surface of the Needle Catch Cavity.

[0038] The retractable injection system further comprises a Plunger shaft retainer positioned behind the Integrated gland. The Plunger shaft retainer comprises a crescent shaped Static brake-fixture present in a first semi-cylindrical portion of the Injector barrel, a Dynamic brake-fixture present in a second semi-cylindrical portion of the Injector barrel, and a Compressible sheet sandwiched between the Static brake-fixture and the Dynamic brake- fixture. A Central passage is present within the Plunger shaft retainer for allowing movement of the Plunger shaft, and the Dynamic brake-fixture has an inclined surface to house a Slide- switch used for controlling movement of the Plunger shaft.

[0039] Movement of the injector Shaft is retained in either direction during injection procedure by gently pushing the Slide-switch in a forward direction, and released by pulling the Slide-switch in a backward direction. Gently pushing the Slide-switch retains movement of the injector Shaft by pressing the Dynamic break-fixture inwardly to press the Compressible sheet against the Static brake fixture. Pressing of the Compressible sheet against the Static brake-fixture arrests and restricts movement of the Shaft in either direction.

[0040] In one embodiment, the retractable injection system further includes a Gland

Plug provided at a distal end of the Injector barrel. The Plunger shaft extends to a Piston present around a central point along a length of the Plunger shaft, thereby forming an air tight seal at the distal end of the Injector barrel between the Piston and the Gland Plug. The Plunger shaft is axially provided with a Capillary, a distal end of the Capillary opens outside the Injector barrel when the retractable injection system is present in an un-pressed condition, and a proximal end of the Capillary has a conical Suction-cup, and the Suction-cup comes in close contact of the distal surface of Piston-head when the injector and the Fluid-cartridge are connected.

[0041] In one embodiment, filling of Fluid into the Fluid-cartridge barrel requires: a) attaching L-shaped grooves provided internally at a proximal end of the Injector with radially arranged Retention Beads provided at a distal end of the outer surface of the Fluid- cartridge barrel; b) exposing the Hypodermic needle by removing a Needle guard and placing the Hypodermic needle embedded in the Fluid; c) exerting pressure on a Thumb-rest configured to move the Plunger shaft along with the piston in a forward direction, wherein upon movement in the forward direction: the Plunger shaft pushes the Piston provided with Plunger-shaft in the forward direction, and a first Vacuum develops between the Piston and the Gland-plug; and the suction cup pushes the Piston-head of Fluid-cartridge in the forward direction to create a second Vacuum between the Ring- seal and the Piston-head, wherein when the distal opening of the capillary comes in contact of the first Vacuum, air is drawn in from the suction cup through the capillary, causing the Suction cup to firmly attach at the distal surface of the Piston-head, d) gradually releasing the pressure applied on the Thumb-rest to cause backward movement of Piston along with the Piston-head due to release of the first Vacuum and the second Vacuum, wherein upon backward movement of the Piston and the Piston-head, required volume of Fluid gets filled into the Fluid-cartridge and the volume of Fluid is readable through graduation marks on surface of barrel of the Fluid-cartridge.

[0042] In one embodiment, releasing of Fluid present in the Fluid-cartridge barrel during an injection procedure requires: a) inserting the Hypodermic needle into an injection site; b) exerting pressure on a Thumb-rest configured to move the Plunger shaft along with the piston in a forward direction to release the Fluid through the Hypodermic needle, wherein upon movement in the forward direction: the Plunger shaft pushes the Piston provided with Plunger-shaft in the forward direction, and a first Vacuum develops between the Piston and the Gland-plug; and the suction cup pushes the Piston-head of the Fluid-cartridge in the forward direction to create a second Vacuum between the Ring-seal and the Piston-head; wherein when the distal opening of the capillary comes in contact of the first Vacuum, air from the suction cup is drawn through the capillary, causing Vacuum in the Suction cup to firmly attach the Suction cup at the distal surface of the Piston- head; wherein gradual increase of pressure on the Piston-head through the Thumb- rest pushes the Fluid of Fluid-cartridge in forward direction to inject the Fluid into the injection site through the Hypodermic needle; and wherein when the Piston-head comes in contact of a Displacer O-ring, and the Piston-head pushes the Displacer O-ring in the forward direction; the Displacer O-ring begins disengaging from the Needle -hub; the Needle-catch-projection gets inserted into the Needle-catch cavity to firmly attach the Needle-hub along with Hypodermic-needle; and the Needle-hub containing Hypodermic-needle gets completely disengaged from the Displacer-O-ring due to its sliding in the forward direction and becomes free to move in a backward direction due to a gap created between an inner surface of Displacer-O-ring and an outer surface of Needle-rim-Collar, wherein upon gradual release of the pressure applied on the Thumb-rest, the first Vacuum and the second Vacuum begin releasing to retract the Hypodermic needle attached with Piston-head, whereby the Piston-head containing the Hypodermic needle gradually retracts along with the Plunger shaft in the backward direction, and the used Hypodermic needle retracts and encapsulates inside the empty Fluid-cartridge, which is detached from the Injector for disposal, and wherein the Plunger-shaft attains initial position, the distal end of Capillary exposes to air behind the Gland-plug, which rushes into Suction cup to release the Vacuum in the Suction cup, resulting into detachment of the suction cup from the distal surface of Piston-head, and to bring the Plunger shaft in initial state to make the Injector ready for next injection procedure.

[0043] In one embodiment, a retractable injection system, according to the present disclosure, comprises: an injector including: an Injector barrel, wherein a body of the Injector barrel is partitioned into two chambers by an Integrated gland present at a proximal end of the Injector barrel; a Plunger shaft configured to move at a central axis of the Injector barrel; a Gland Plug provided at a distal end of the Injector barrel; a Gland-magnet-I and a Gasket- seal provided at an outer rim of the Gland-plug; an O-ring Seal-II provided at an inner rim of the Gland Plug; a Support flange provided at the distal end of the Gland plug to support airtight fixing and removing the Gland plug at the distal end of the Injector barrel; a Piston embedded with a Piston magnet- II facing the Gland-magnet-I with opposite pole being provided around a central point present along a length of the Plunger- shaft; a straight rod-like Needle-shaft extending from the piston towards the proximal end of the Injector barrel, wherein a proximal end of the Needle- shaft is provided with an Attachment fixture at the tip to hold a Collapsible- bulb made of a resilient soft material to act as a collapsible piston; a Thumb-rest provided at a distal end of the Plunger shaft for application of force by a user; a Finger-rest provided at a distal end of the Injector barrel to hold the injector; and a Ring-seal provided at the proximal end of the Injector barrel and in contact with the Integrated gland to create a seal with a Fluid-cartridge or a Fluid-collector, and a capillary Fluid-cartridge including: a hollow capillary Fluid-cartridge barrel having a Conical-mouth at a proximal end; an Axial-capillary present along a central longitudinal axis of the Fluid-cartridge barrel; a bead-shaped Piston-head provided at a distal end of the Axial capillary; and a Needle-assembly comprising a Hypodermic Needle covered with a Tip-guard, present at a proximal end of the Axial-capillary, wherein a distal end of the Hypodermic Needle is fixed within a through hole of a Needle -hub, wherein proximal end of the Hypodermic Needle is closed with an End-tip bead having diameter higher than an aperture of Needle hub-restrictor Flange of the Axial capillary, wherein a particular volume of Fluid, mentioned at the surface of Fluid-cartridge barrel, is filled between the bead- shaped Piston-head and the Needle assembly, wherein the Fluid along with the Needle-hub containing the Hypodermic needle slides in forward direction within the Axial-capillary upon movement of the bead-shaped Piston-head in forward direction resulting the proximal end of Hypodermic needle to protrude out of the proximal end mouth of the Axial capillary piercing through the End-tip bead, and wherein L-shaped grooves provided at the inner surface of the Injector barrel firmly hold the capillary Fluid-cartridge through radial beads present on a distal end of the capillary Fluid-cartridge.

[0044] In one embodiment, the retractable injection system further comprises a Plunger shaft retainer positioned behind the Integrated gland. The Plunger shaft retainer comprises a crescent shaped Static brake-fixture present in a first semi-cylindrical portion of the Injector barrel, a Dynamic brake-fixture present in a second semi-cylindrical portion of the Injector barrel, and a Compressible sheet sandwiched between the Static brake-fixture and the Dynamic brake-fixture. A Central passage is present within the Plunger shaft retainer for allowing movement of the Plunger shaft. The Dynamic brake-fixture has an inclined surface to house a Slide-switch for controlling movement of the Plunger shaft.

[0045] In one embodiment, injecting the Fluid present within the Axial-capillary into injection site requires: a) attaching the Capillary Fluid-cartridge at the proximal end of Capillary injector through Radial beads of said Capillary Fluid-cartridge into the F-shaped grooves of the Capillary injector; b) removing the Tip-guard covering the Hypodermic needle; c) placing the End-tip of the Capillary Fluid-cartridge in close contact of the intended injection- site; d) exerting pressure on the Thumb-rest configured to move the Plunger shaft along with the piston in a forward direction to release the Fluid through the Hypodermic needle, wherein upon movement in the forward direction: the proximal end of the Collapsible-bulb resting at the distal end of the Capillary enters into the Capillary to act like a piston, and a Vacuum is developed between the Gland-plug and the Piston, the Collapsible -bulb presses the Piston-head and forces the Fluid along with the Needle-assembly in a forward direction, wherein the Hypodermic-needle upon moving in a forward direction pierces the End- tip bead and enters into the injection site, wherein the movement of End- tip bead and the Needle-hub is restricted by an aperture of the Capillary Fluid-cartridge, further exertion of pressure on the thumb-rest directly presses the Piston-head on the Fluid, which in turn is forced to pass through the Hypodermic needle into the injection site, when all of the Fluid is injected into the injection site, the proximal end of Piston-head comes in close contact of distal end of the Needle-hub with no space therebetween, e) gradually withdrawing the pressure applied on the Thumb-rest to cause: release of the Vacuum created between the Gland-plug and the Piston, wherein release of the Vacuum causes the Plunger-shaft to move in backward direction along with the Collapsible -bulb which sucks the Piston-head and the Needle -hub along with the used Hypodermic needle in backward direction, wherein upon such backward movement the used Hypodermic needle retracts and gets encapsulated into the empty Capillary of the Capillary Fluid-cartridge for safe disposal, and wherein the opposite pole of Piston magnet- II of Piston while moving in backward direction comes closer and is attracted by opposite pole of the Gland magnet-I of the Gland-plug to bring the Collapsible-bulb in initial state, thereby getting the Capillary injector ready for a next injection procedure.

[0046] In one embodiment, the injector may further comprise a hollow and cylindrical telescopic barrel housing the Plunger shaft. The injector may further comprise a Finger-rest on a distal end of the Injector barrel for holding the injector, wherein the Finger-rest projects outwards and perpendicular to the Injector barrel. The injector may further comprise a Rim present at the distal end of the Injector barrel, wherein the Rim is provided with two equidistant Slots projecting inwardly and perpendicularly connected with straight, linear, and parallel grooves at the inner surface of the Injector barrel through L-shaped grooves rotatable at 90° angle and holding the Telescopic barrel through beads present at proximal ends of the Telescopic barrel. The injector may further comprise a Compressible spring disposed in a chamber defined between the Plunger shaft and the Telescopic barrel. The injector may further comprise a Thumb-rest provided at a distal end of the Telescopic barrel to move the Telescopic barrel alongside the Injector barrel in a forward direction.

[0047] The Plunger shaft and the Telescopic barrel coalesce at the Thumb-rest, and wherein upon application of force on the Thumb-rest, the Telescopic barrel moves inside the Injector barrel in forward direction and compresses the Compressible spring which expands upon the release of the force applied on the Thumb-rest to bring the Telescopic barrel and the Plunger shaft in an initial state. An inner diameter of the Rim is greater than an outer diameter of the Telescopic barrel. Two equidistant radially arranged beads opposite to each other are provided at outer surface of the proximal end of the Telescopic barrel. Outer diameters and width of the slots and the grooves are equal and/or greater than the inner diameter of the Injector barrel and the outer diameter of beads, for allowing axial movement of the Telescopic barrel inside the Injector barrel. [0048] The Plunger shaft may further comprise an extended portion present outside a distal end of the Telescopic barrel and ending up into the Thumb-rest. The Plunger shaft may further comprise a remaining portion present inside the Telescopic barrel. The Plunger shaft may further comprise two equidistant beads present at a junction between the extended portion and the remaining portion of the Plunger shaft, wherein the beads project outwards, disposed inside the Telescopic barrel, and engage with inwardly projecting Slots of the Rim to retain the remaining portion of the Plunger shaft inside the Telescopic barrel. The Plunger shaft may further comprise a Rim present at the distal end of the Telescopic barrel, wherein the Rim is provided with two equidistant Slots projecting inwardly and perpendicularly connected with straight, linear, and parallel grooves at the inner surface of the Telescopic barrel through L- shaped grooves rotatable at 90° angle and holding the Plunger-shaft through beads present at a junction between the extended portion and the remaining portion of the Plunger shaft. Upon application of force on the Thumb-rest, the extended portion of the Plunger shaft moves inside the Telescopic barrel in forward direction and compresses the Compressible spring, which expands to attain an initial state upon release of the force applied on the Thumb-rest.

[0049] An inner diameter of the Rim is greater than an outer diameter of the Plunger- shaft. The Beads have a predefined dimension to conveniently pass through the slots, while fitting the Plunger-shaft inside the Telescopic barrel to facilitate sliding movement of the Beads of the Plunger-shaft within linear grooves provided at internal surface of the Telescopic barrel. Outer diameters and width of the slots and the grooves are equal and greater than the inner diameter of the Telescopic -barrel and the outer diameter of beads, for allowing axial movement of the Plunger-shaft inside the Telescopic barrel.

[0050] In one embodiment, within the injector, a Plunger shaft retainer is positioned behind the Integrated gland. The Plunger shaft retainer may comprise a crescent shaped Static brake-fixture present in a first semi-cylindrical portion of the Injector barrel, a Dynamic brake- fixture present in a second semi-cylindrical portion of the Injector barrel, and a Compressible sheet sandwiched between the Static brake-fixture and the Dynamic brake-fixture. A Central passage is present within the Plunger shaft retainer for allowing movement of the Plunger shaft. The Dynamic brake-fixture has an inclined surface to house a Slide-switch for controlling movement of the Plunger shaft. A rectangular Slot is provided before the Integrated gland to house the Slide-switch. L-shaped grooves are provided at the inner surface of a proximal end of the Injector barrel to lock with radial beads present on a distal end of Fluid-cartridge and Fluid-collector respectively.

BRIEF DESCRIPTION OF ACCOMPANYING DRAWINGS

[0051] These and other features, aspects, and advantages of the present disclosure will become better understood when the following detailed description is read with reference to the accompanying drawings in which the like characters represent the like parts throughout the drawings, wherein:

[0052] Fig. 1(a) illustrates a cross-sectional line diagram of the Injector (A) of the disclosed Fluid Injection and Collection System, in accordance with an embodiment of current disclosure.

[0053] Fig. 1(b) illustrates a transverse cross-sectional line diagram of the Fluid- cartridge (B) of the disclosed Fluid Injection and Collection System, in accordance with an embodiment of current disclosure.

[0054] Fig. 2 illustrates a cross-sectional line diagram of the Fluid collector (C) of the disclosed Fluid Injection and Collection System, in accordance with an embodiment of current disclosure. [0055] Fig. 3(a) illustrates a cross-sectional line diagram of the Injector (A’) of the disclosed Fluid Injection and Collection System, in accordance with an embodiment of current disclosure.

[0056] Fig. 3(b) illustrates a transverse cross-sectional line diagram of the Plunger shaft retainer of the disclosed Fluid Injection and Collection System, in accordance with an embodiment of current disclosure.

[0057] Fig. 4 illustrates a cross-sectional line diagram of the Injector (A”) of the disclosed Fluid Injection and Collection System, in accordance with an embodiment of current disclosure.

[0058] Fig. 5(a) illustrates a cross-sectional line diagram of the Capillary injector (A’ ”) of the disclosed Fluid Injection and Collection System, in accordance with an embodiment of current disclosure.

[0059] Fig. 5(b) illustrates a transverse cross-sectional line diagram of the Plunger shaft retainer of the disclosed Fluid Injection and Collection System, in accordance with an embodiment of current disclosure.

[0060] Fig. 6 illustrates a cross-sectional line diagram of the Capillary Fluid-cartridge

(B’) of the disclosed Fluid Injection and Collection System, in accordance with an embodiment of current disclosure.

[0061] Fig. 7 (a) to (h) illustrate cross-sectional line diagram and functioning steps of the Auto-retractable Safety Syringe Assembly (A) and (B) of the disclosed Fluid Injection and Collection System, in accordance with an embodiment of current disclosure.

[0062] Figs. 8 (a) to (h) illustrate cross-sectional line diagram and functioning steps of the Auto-retractable Safety Syringe Assembly (A’) and (B) of the disclosed Fluid Injection and Collection System, in accordance with an embodiment of current disclosure. [0063] Figs. 9 (a) to (h) illustrate cross-sectional line diagram and functioning steps of the Auto-retractable Safety Syringe Assembly (A”) and (B) of the disclosed Fluid Injection and Collection System, in accordance with an embodiment of current disclosure.

[0064] Figs. 10 (a) to (f) illustrate cross-sectional line diagram and functioning steps of the Auto-retractable Safety Syringe Assembly of Capillary Injector and Capillary Fluid- cartridge (A’”) and (B’) respectively of the disclosed Fluid Injection and Collection System, in accordance with an embodiment of current disclosure.

[0065] Figs. 11 (a) to (h)illustrate cross-sectional line diagram and the functioning steps of the Fluid Collection System (A”) and (C) of the disclosed Fluid Injection and Collection System, in accordance with an embodiment of current disclosure.

[0066] Fig. 12a illustrates side view of Injector barrel utilizing a Compressible spring, in accordance with an embodiment of current disclosure.

[0067] Fig. 12b illustrates front view of Injector barrel utilizing a Compressible spring, in accordance with an embodiment of current disclosure.

[0068] Figs. 12c through 12e illustrate sectional views of Injector barrel utilizing a

Compressible spring, in accordance with an embodiment of current disclosure.

[0069] Fig. 13a illustrates side view of Injector barrel utilizing a Compressible spring, in accordance with another embodiment of current disclosure.

[0070] Figs. 13b through 13d illustrate sectional views of Injector barrel utilizing a

Compressible spring, in accordance with another embodiment of current disclosure.

[0071] Figs. 14 (a) to (j) illustrate sectional views of Injector barrel (A-l) utilizing a

Compressible spring (26) cross-sectional line diagrams showing functional steps of an Auto- retractable Safety Syringe Assembly including Injector barrel (A-l) and a Fluid-cartridge (B), in accordance with an embodiment of current disclosure. DETAILED DESCRIPTION

[0072] The embodiments of disclosure entitled “A Fluid injecting & collecting system with retractable needle operable by Vacuum” are described in detail with reference to the accompanying drawings. However, the present subject matter is not limited to these embodiments, which are only provided to explain more clearly the present subject matter to the person skilled in the art of the present disclosure. In the accompanying drawings, like reference numerals are used to indicate the like components.

[0073] The proposed method and device to constitute a Fluid injecting and Collecting system with retractable needle consisting of Injector and Fluid-cartridge (100) as shown in Fig. 7 (b) consists of three parts namely the Injector (A) and the Fluid-cartridge (B) and Fluid- collector (C), as are separately shown in Figs. 1(a), 1(b), and 2 respectively.

[0074] The Injector (A) as shown in Fig. 1(a) comprises of an Injector barrel (10) and a Plunger shaft (30). The Injector barrel (10) of the Injector (A) is a uniformly hollow, regular cylindrical body opened at both ends. The body is separated into two chambers through an Integrated-gland (12) at the proximal end (P) embedded with O-ring seal-1 (13) at inner surface and a Ring- seal (14) at the proximal end to create a seal with the Fluid-cartridge (B, B’) or Fluid-collector (C). At proximal end, the Injector barrel (10) is also provided with a securing mean, such as L-shaped grooves (15) at the inner surface to firmly hold the Fluid- cartridge (B, B’) or Fluid Collector (C) during the injection or fluid collection procedure. The distal end of Injector barrel (10) is provided with a Finger-rest (11) to hold the injector.

[0075] A Plunger shaft (30) is a straight and uniform rod like structure movable axially alongside the Injector barrel (10) provided with a Collar (38) to restrict the Plunger shaft (30) to move in backward direction. The distal end of Plunger shaft (30) is provided with a Thumb- rest (34). The Thumb-rest (34) is attached with a Threaded portion (33) present on the distal end of Plunger shaft (30). [0076] Another embodiment of Injector (A’) as shown in Fig. 3(a) consists of an

Injector barrel (10), Plunger shaft retainer (20), and a Plunger shaft (30). The Injector barrel

(10) of the Injector (A’) is a uniformly hollow, regular cylindrical body opened at both ends. The body is separated into two chambers through an Integrated-gland (12) at the proximal end embedded with O-ring seal-1 (13) at inner surface and a Ring-seal (14) at the proximal end to create a seal with the Fluid-cartridge (B, B’) or Fluid-collector (C). At proximal end, the Injector barrel (10) is also provided with L-shaped grooves (15) at the inner surface to firmly hold the Fluid-cartridge (B, B’) or Fluid Collector (C) and create a seal during the injection or Fluid collection procedure. The distal end of Injector barrel (10) is provided with a Finger-rest

(11) to hold the injector.

[0077] The Plunger shaft retainer (20) consists of a crescent shaped Static brake-fixture

(21a) and a Dynamic brake-fixture (21b) with a Compressible sheet (24) sandwiched between them provided with a Central passage (22) for the Plunger shaft (30) to move parallely alongside the Injector barrel (10), as shown in Fig. 3(b). A Dynamic brake-fixture (21b) is provided at upper end along with inclined surface to house a Slide-switch (23) to control the movement of Plunger shaft (30).

[0078] A Plunger shaft (30) is a straight and uniform rod like structure movable axially alongside the Injector barrel (10) provided with a Collar (38) to restrict the Plunger shaft (30) to move in backward direction. The distal end of the Plunger shaft (30) is provided with a Thumb-rest (34) attached with a Threaded end (33). The distal end of the Plunger shaft (30) is provided with a Thumb-rest (34) attached with a Threaded end (33).

[0079] Another embodiment of the Injector (A”) as shown in Fig. 4 consists of an

Injector barrel (10), Plunger shaft retainer (20), Plunger shaft (30), and a Gland Plug (40). The Injector barrel (10) of the Injector (A) is a uniformly hollow, regular cylindrical body opened at both ends. The body is separated into two chambers through an Integrated-gland (12) at the proximal end embedded with O-ring seal-I (13) at inner surface, Lubricant-soaked foam (17) and a Ring-seal-II (14) at the proximal end to create a seal with the Fluid-cartridge (B) or Fluid-collector (C). At proximal end the Injector barrel (10) is provided with a rectangular Slot (16) before the Integrated gland (12) to provide a Slide-switch (23). It is also provided with L- shaped grooves (15) to firmly hold the Fluid-cartridge (B, B’) or Fluid Collector (C) during the injection or fluid collection procedure. The distal end of Injector barrel (10) is provided with a Finger-rest (11) to hold the injector. The distal end of the Injector barrel (10) is also provided with a Gland-plug (40) holding a Gland-magnet-I (44) and a Gasket- seal (42) at its outer rim, O-ring Seal-II (43) at the inner rim, and a Support flange (41) at the distal end to constitute an air tight seal at the distal end of the Injector barrel (10).

[0080] The Plunger shaft retainer (20) consists of a crescent shaped Static brake-fixture

(21a) and a Dynamic brake-fixture (21b) with a Compressible sheet (24) sandwiched between them provided with a Central passage (22) for the Plunger shaft (30) to move parallely alongside the Injector barrel (10). A Dynamic brake-fixture (21b) is provided at upper end along with inclined plane surface to house the Slide-switch (23) to control the movement of Plunger shaft (30).

[0081] The Plunger shaft (30) is a straight rod like structure movable axially alongside the Injector barrel (10) provided with a Piston (31) at middle holding a Piston-magnet-II (36) and a Piston-seal (35) at an outer rim of the Piston (31). The Piston (31) extends outwards, towards an inner surface of the Injector barrel (10).

[0082] The distal end of Plunger shaft (30) is provided with a Thumb-rest (34) attached with a Threaded end (33). The Plunger shaft (30) is axially provided with a Capillary (32), with distal end opening around middle of the Plunger shaft (30) and constituting a conical Suction- cup (37) at proximal end. The distal end of the Capillary (32) opens outside the Injector barrel (10) when the syringe is present in an un-pressed (relaxed) condition. [0083] Another embodiment of Capillary-injector (A’ ”) is shown in Fig. 5(a) having a slight modification in injector (A”) to suit to Capillary Fluid-cartridge (B’). It consists of a Capillary Injector barrel (10’), Plunger shaft retainer (20’), Plunger shaft (30’), and a Gland- plug (40’). The Plunger shaft (30’) constitutes a straight rod-like Needle-shaft (39’) extending from the piston (3F) to the proximal end provided with an Attachment fixture (37’) at the proximal end of the Needle-shaft (39’) to hold a Collapsible-bulb (38’) made of resilient soft material to act as a collapsible piston. The Plunger shaft retainer (20’) is also modified accordingly as shown in Fig. 5(b).

[0084] The Fluid-cartridge (B) as shown in Fig. 1(b) consists of a Fluid-cartridge Barrel

(50), a Piston-head (60) and a Needle-assembly (70). Referring to Fig. lb, the Fluid-cartridge Barrel (50) is a uniformly regular and hollow cylindrical body, opening at both ends and with a conical mouth at proximal end (P) constituting a Cap Retention Fixture (52) at its outer surface. The Fluid-cartridge Barrel (50) is provided with radially arranged Retention Beads

(51) at distal end of the outer surface to firmly attach with the L-shaped grooves (15) provided internally at the proximal end of the Injector (A).

[0085] The Piston-head (60) consists of a cylindrical disc with a centrally protruded

Needle Catch Projection (61) present at its proximal end, and an O-ring Seal (62) present at the outer rim of the Piston-head (60). The Piston-head (60) having the O-ring Seal (62) is sealingly moveable alongside the Fluid-cartridge Barrel (50).

[0086] The Needle-assembly (70) consists of a Needle-hub (78) with a Needle Catch

Cavity (72) at distal end to receive and engage with the Needle Catch Projection (61). The Needle Catch Cavity (72) is provided with an axial Groove (71) alongside the inner rim. The Needle-hub (78) holds a uniform hollow regular and straight Hypodermic Needle (74) at proximal end distally opening in the Needle Catch cavity (72). The inner diameter of Needle Catch Cavity (72) is equal to the outer diameter of Needle Catch Projection (61) to receive and engage with it firmly. The Needle-hub (78) is provided with a Collar (77) at its distal end of the outer rim to hold the Displacer O-ring seal (73) between the Collar (77) and the inner surface of the Fluid-cartridge Barrel (50). The inner diameter of the Displacer O-ring seal (73) at distal end is kept slightly larger than the outer diameter of Collar (77) to disengage the Needle-hub (78) from the O-ring seal (73). It is further provided with a Needle cover (75) to guard the Hypodermic-needle (74) with a Retention-sleeve (76) at distal end and to engage with the Cap Retention-fixture (52) of Fluid-cartridge Barrel (50).

[0087] There is a space between Piston-head (60) and the Needle-assembly (70) to hold the Fluid (65), which may be aspirated into said space of empty Fluid-cartridge (B) from the intended Fluid source and/or said Fluid (65) may be transferred from such filled or prefilled Fluid-cartridge (B) into the injection site through hypodermic needle (74).

[0088] In empty Fluid-cartridge, the surface of the Fluid-cartridge barrel (50) is provided with graduation marks between the Piston-head (60) and the Needle-assembly (70) to read the volume of aspirated Fluid into said space (65), whereas in another embodiment of pre-filled Fluid-cartridge, a fixed volume of Fluid is filled in space (65) between the Piston- head (60) and the Needle-assembly (70), volume of which is written at the surface of the Fluid- c-rtridge barrel (50) of said Fluid-cartridge (B).

[0089] Another embodiment regarded as Capillary Fluid-cartridge (B’) as shown in

Fig. 6 consisting of a regular, uniform, straight, and hollow capillary Fluid-cartridge Barrel (50’) with a Conical-mouth (55’) at proximal end, housing inside an axially straight, regular, uniform and hollow Axial-capillary (53’). The Axial-capillary (53’) is present along a central longitudinal axis of the Fluid-cartridge Barrel (50’). Opening at a proximal end of the Axial- capillary (53’) is provided with a Needle hub-restrictor Flange (54’) to restrict the axial movement of the Needle-assembly (70’), the Axial-capillary (53’) holding a cylindrical disc or bead-shaped Piston-head (60’) at its distal end and Needle-assembly (70’) at proximal end holding a straight, regular, uniform and hollow Hypodermic Needle (74’) at proximal end. The Hypodermic Needle (74’) opening at both ends is provided with a slidable bead-shaped- structure constituting Needle -hub (78’) at distal end. A fixed volume of Fluid (65’) is pre-filled between the Piston-head (60’) and the Needle-hub (78’). The volume of Fluid inside the capillary is written at the surface of Fluid-cartridge Barrel (50’). The proximal end of the Fluid- Cartridge Barrel (50’) is provided with a conical Tip-guard (75’) to protect the Hypodermic Needle (74’). Proximal end of the Hypodermic Needle (74’) is closed with an End-tip bead (74a) having diameter higher than an aperture of Needle hub-restrictor Flange (54’) of the Axial capillary (53’). The End-tip bead (74a) would prevent leakage of the Fluid (65’) within the Needle hub-restrictor Flange (54’) and/or the Tip-guard (75’) while the Piston-head (60’) is being pressed for release of the Fluid (65’) in an injection site. During operation, the Needle hub-restrictor Flange (54’) would not allow the End-tip bead (74a) to move out and thus, the End-tip bead (74a) would get punctured by the Hypodermic Needle (74’) and the Fluid (65’) would be released only when the Hypodermic Needle (74’) moves out of the Needle hub- restrictor Flange (54’).

[0090] The Fluid-collector (C) as shown in Fig. 2 consists of a Fluid collecting Barrel

(80), a Piston-head (90), and a Needle-hub (110). The Fluid collecting Barrel (80) is a uniformly regular and hollow cylindrical body, opening at both ends provided with a conical Needle-retention Nozzle (84) at proximal end with an axial Capillary (83) centrally opening through the Needle-retention Nozzle (84) at proximal end to hold the Needle -hub (110) containing a Hypodermic Needle (111). The distal end of axial Capillary (83) opens in the Fluid collecting Barrel (80) to provide passage to the Hypodermic-needle (111). The proximal portion of the Fluid collecting Barrel (80) has a provision at its outer surface to retain the Needle cover (113) along with a radial Breakaway Seal (115), which fastens the Fluid collecting barrel (80) with a Needle cover (113). At the distal end, the Fluid collecting barrel (80) is radially provided with Retention-beads (81) to firmly engage with L-shaped grooves (15) of the Injector (A). The surface of Fluid collecting Barrel (80) is provided with Graduation-marks (82) to measure the volume of Fluid. The distal end of the Fluid collecting Barrel (80) is provided with a fixedly slidable Piston-head (90) housing inside the Fluid collecting barrel (80), comprising of a cylindrical disc provided with O-ring Seals (91) on its outer rim.

[0091] The Needle-hub (110) consists of a hollow conical body, with a distal end constituting Conical Lock-1 (112), with an inner diameter equal to an outer diameter of the Needle Retention Nozzle (84). It is provided with a uniform hollow regular and straight Hypodermic Needle (111) at proximal end.

[0092] The Needle cover (113) is a hollow cylindrical body opening at distal end with an inner diameter equal to the outer diameter of the Fluid collecting Barrel (80) and an elongated narrow cylindrical hollow body at proximal end to guard the Hypodermic Needle (111). The Needle cover (113) is internally provided with a Conical Lock-2 (114) at the distal end of elongated cylindrical body.

[0093] The Breakaway Seal (115) is a removable radial fixture at the distal end of the

Needle cover (113) to fasten the Fluid collecting Barrel (80) with the Needle cover (113). It is provided with a Tab (116) to break and remove the Breakaway seal (115) to separate the Needle cover (113) from the Fluid collecting barrel (80) to expose the Hypodermic Needle (111) before a Fluid collection process.

[0094] The Schematic details of operation of Fluid injecting and collecting system are shown in Figs. 7 to 11.

[0095] For injection procedure, various operational steps of the combination of the

Injector (A) and the Fluid-cartridge (B) is illustrated in Figs. 7(a) to (h). At first, the desired Fluid-cartridge (B) (either empty or pre-filled Fluid-cartridge as per requirement) is attached with Injector (A) to constitute the said retractable injection system. The distal end of the Fluid- cartridge (B) is attached at the proximal end of the Injector (A) through the Beads (51) of Fluid- cartridge by engaging said beads within the L-shaped grooves (15) to constitute the complete injection system in the form of Vacuum operable Retractable Syringe (100) as shown in Figure - 7(b). On attaching the Fluid-cartridge (B) with the Injector (A), an air tight seal is created at the junction between the injector (A) and the Fluid-cartridge (B) and the end-tip of Plunger shaft (30) comes in close contact of the distal surface of Piston-head (60) of the Fluid-cartridge (B).

[0096] While using empty Fluid-cartridge (B), the user needs to aspirate the Fluid

(medicament) from the Fluid container (vial, ampule etc.). In order to aspirate the Fluid from the Fluid container the Hypodermic needle (74) is exposed by removing the Needle guard (75) and the needle is placed embedded in Fluid of container. On exerting pressure on the Thumb- rest (34) to move the Plunger shaft (30) in forward direction, it simultaneously pushes the Piston-head (60) in forward direction along-side the Injector barrel (10), consequently a Vacuum (V) begins creating between the Ring seal (14) of the injector (A) and Piston-head (60) of the Fluid-cartridge (B). In case, the Fluid container is a closed vessel, air available between Piston-head (60) and the Needle-assembly (70) gets transferred into said Fluid container, which in turn helps in aspiration of Fluid by increasing air pressure inside said Fluid container. The Thumb-rest (34) is pressed to the extent that the Piston-head (60) does not touch the Displacer O-ring seal (73) of the Needle-assembly (70).

[0097] Thereupon, pressure applied on the Thumb-rest (34) is gradually released, which results in automatic movement of the Piston-head (60) in backward direction along with the Plunger shaft (30) due to release of Vacuum (V). The Fluid also begins aspirating from said Fluid container into the empty Fluid-cartridge (B). The desired volume of Fluid may thus be aspirated into empty Fluid-cartridge through controlled movement of the Plunger shaft (30) in forward and backward direction, in a usual manner. In this manner, required volume of the Fluid (65) is aspirated from said container by observing the volume through graduation marks placed at the surface of empty Fluid-cartridge (B). The hypodermic-needle is withdrawn after aspiration of said Fluid from the Fluid-container as shown in Fig. 7(d).

[0098] Now, the needle is gently inserted at injection site. When pressure is exerted on the Thumb-rest (34), the Plunger shaft (30) moves in forward direction to push the Piston-head (60) alongside the Fluid-cartridge barrel (50), which results in transfer of the Fluid (65) from the Fluid-cartridge (B) into the injection site through the Hypodermic-needle (74). When the Piston-head (60) comes in contact of the Displacer O-ring (73) and pushes it in forward direction, the Displacer O-ring (73) begins disengaging from the Needle -hub (78) and simultaneously the Needle-catch-projection (61) begins inserting in the Needle catch cavity (72), as shown in Fig. 7 (e). At this stage, the Fluid (65) trapped between the Piston-head (60) and the Needle-hub (78) conveniently passes through the Needle-cavity groove (71) and after completion of injection process, the Needle-catch-projection (61) completely occupies the Needle catch cavity (72) to attach the Needle-hub (78) along with the Hypodermic-needle (74), which is completely disengaged from the Displacer-O-ring (73) due to its sliding in forward direction. Thus, the Needle -hub (78) containing the Hypodermic-needle (74) is firmly attached with the proximal surface of the Piston-head (60) and becomes free to move in backward direction due to a gap created between the inner surface of the Displacer-O-ring (73) and outer surface of a Needle-rim-Collar (77), as shown in Fig. 7 (f).

[0099] When the pressure is gradually released from the Thumb-rest (34), the Vacuum

(V) begins releasing to retract the Hypodermic needle (74) attached with the Piston-head (60) along with the Plunger shaft (30) in backward direction, to bring the Injector (A) in initial state, as shown in Fig. 7(g). At the completion of injection procedure, the used Hypodermic needle (74) attached at proximal end of the Piston-head (60) is finally retracted and is safely encapsulated inside the empty Fluid-cartridge (B), which is finally detached from the injector (A) for safe disposal. In this manner, the Injector (A) attains its initial state to become ready for next injection procedure, as shown in Fig. 7(h).

[00100] In case, the prefilled Fluid-cartridge is attached with Injector (A) to constitute Vacuum operable retractable syringe, the injection procedure becomes quite easy and the operator simply needs to expose and insert the Hypodermic needle (74) into the injection site and press the Thumb-rest (34) to complete the injection procedure in the like manner.

[00101] For injection procedure, various operational steps of the combination of the Injector (A’) and the Fluid-cartridge (B) are illustrated in Figs. 8(a) to (h).

[00102] The desired Fluid-cartridge (B) (either empty or pre-filled Fluid-cartridge as per requirement) is attached with injector (A’) to constitute said retractable injection system (100’) in the like manner as shown in Fig. 8 (b).

[00103] The injector A’ has been provided with a Plunger shaft retainer (20), which effectively facilitates controlled movement of the Plunger shaft (30) while aspirating the Fluid from the Fluid container into the empty Fluid-cartridge or delivering the Fluid into the injection site. Rest functions of said system (100’) are performed in the like manner as described earlier in case of Injector (A), as shown in Figs. 7(a) to (h).

[00104] When the desired volume of Fluid is retained in Empty-cartridge, the movement of injector Shaft (30) may be retained by gently pushing the Slide-switch (23) in forward direction, which presses the Dynamic break-fixture (21b) inwardly to press the Compressible sheet (24) against the Static brake-fixture (21b), which arrests and restricts the movement of Shaft (30) in either direction. The Slide-switch (23) may be released further by pulling it in backward direction during the injection procedure to release the Plunger shaft (30) after inserting the hypodermic needle (74) into the injection site before exerting pressure on the Thumb-rest (34) to complete the injection procedure. [00105] For injection procedure, various operational steps of the combination of the

Injector (A”) and the Fluid-cartridge (B) are illustrated in Figs. 9(a) to (h).

[00106] The desired Fluid-cartridge (B) (either empty or pre-filled Fluid-cartridge as per requirement) is attached with Injector (A”) to constitute the said retractable injection system (100”) in the like manner as shown in Fig. 9(b).

[00107] The distal end of the desired Fluid-cartridge (B) (either empty or pre-filled Fluid-cartridge as per requirement) is attached at the proximal end of the Injector (A”) through the Retention beads (51) of Fluid-cartridge by engaging the said beads within L-shaped grooves (15) of the Injector (A”) to constitute complete injection system in form of Vacuum operable retractable syringe (100”), as shown in Fig. 9(b). On attaching said Fluid-cartridge (B) with Injector (A”), an airtight seal is created at the junction between the injector (A”) and the drug- cartridge (B) and the Suction cup (37) attached at the end-tip of capillary (32) of the Plunger shaft (30) comes in close contact of the distal surface of Piston-head (60) of the Fluid-cartridge (B).

[00108] The Piston (31) disposed at the middle of the Plunger shaft (30) initially remains in close contact with the Gland-plug (40) due to magnetic force of attraction created between opposite poles of magnets (44) and (36) embedded inside the gland-plug (40) and the Piston (31) respectively. On exerting pressure on Thumb-rest (34), the Plunger shaft (30) along with the Piston (31) moves in forward direction to create a first Vacuum (V-l) inside the Injector (A”) between the Piston (31) and the Gland-plug (40). Simultaneously, the suction cup (37) also pushes the Piston-head (60) in forward direction to create a second Vacuum (V-2) inside the Fluid-cartridge (B) between the Ring-seal (14) and the Piston-head (60). When the distal opening of Shaft-capillary (32) comes in contact of the first Vacuum (V-l), it sucks the air from suction cup (37) through the capillary (32) resulting the Suction cup (37) to firmly attach at the distal surface of the Piston-head (60). The force of attachment between the Suction cup (37) and the Piston-head (60) gradually increases with creation of the first Vacuum (V-l) and the second Vacuum (V-2) upon movement of the Piston (31) in forward direction, as shown in Fig. 9(c). During this process, air of the empty Fluid-cartridge gradually transfers into the Fluid container, increasing air-pressure inside Fluid-container. The Thumb-rest (34) is pressed to the extent that the piston-head does not touch the Displacer O-ring seal (73). When the pressure is gradually released from the Thumb-rest (34), it results into movement of the Piston (31) along with the Piston-head (60) in backward direction due to the release of the first Vacuum (V-l) and the second Vacuum (V-2). Consequently, the Fluid (65) rushes from the Fluid container into the empty Fluid-cartridge. The air-pressure inside the Fluid container also aids in this aspiration process of said Fluid. Desired volume of the Fluid (65) is aspirated into empty Fluid- cartridge through controlled movement of the Shaft in forward and backward direction. Volume of the Fluid (65) aspirated in the Fluid-cartridge may be read on its surface graduation marks. When desired volume of the Fluid (65) is retained in Empty-cartridge, movement of the injector Shaft (30) is retained by gently pushing the Slide-switch (23) in forward direction, which presses the Dynamic break- fixture (21b) inwardly to press the Compressible sheet (24) against the Static brake-fixture (21b), which arrests and restricts movement of the Shaft (30) in either direction. After aspiration of desired volume of Fluid, the Hypodermic-needle (74) is withdrawn from the Fluid-container, as shown in Fig. 9 (d).

[00109] Now, the Hypodermic needle (74) is gently inserted at injection site and the Slide-switch (23) is slightly pulled in backward direction to release the Plunger shaft (30) to allow its movement in backward direction due to release of the first Vacuum (V-l) and the second Vacuum (V-2), therefore operator needs be careful to keep proper control on the Thumb-rest (34) before pulling the Slide-switch (23).

[00110] On increasing further pressure on the Thumb-rest (34), the Plunger shaft (30) moves further in forward direction to push the Piston-head (60), which results in transfer of the Fluid (65) from the Fluid-cartridge (B) into the injection site, through the Hypodermic-needle (74). When the Piston-head (60) comes in contact of the Displacer O-ring (73) and pushes it in forward direction, the Displacer O-ring (73) begins disengaging from the Needle-hub (78) and simultaneously the Needle-catch-projection (61) begins inserting in the Needle catch cavity (72), as shown in Fig. 9(e). At this stage, the Fluid (65) trapped between the Piston-head (60) and the Needle-hub (78) conveniently passes through the Needle-cavity groove (71) and after completion of injection process, the Needle catch-projection (61) completely occupies the Needle catch cavity (72) to firmly attach the Needle-hub (78) along with the Hypodermic- needle (74). The Needle-hub (78) is completely disengaged from the Displacer-O-ring (73) by sliding in forward direction. Thus, the Needle-hub (78) containing the Hypodermic-needle (74) firmly attached with the proximal surface of the Piston-head (60) becomes free to move in backward direction due to a gap created between inner surface of the Displacer-O-ring (73) and outer surface of the Needle-rim-Collar (77), as shown in Fig. 9(f). When the pressure is gradually released from the Thumb-rest (34), the first Vacuum (V-l) and the second Vacuum (V-2) begin releasing to retract the Hypodermic needle (74) attached with the Piston-head (60), which is also attached to the Suction-cup (37) at distal end due to suction of its air. Thus, the Piston-head (60) containing the Hypodermic needle (74) gradually slides with the Plunger shaft (30) in backward direction. As soon as the distance between the Plunger shaft-piston (31) and the Gland-plug (40) decreases, force of attraction between opposite poles of the Gland magnet (44) and the Piston-magnet (36) begin increasing, to bring them in close contact of each other, as shown in Fig. 9(g). Open end of the Capillary (32) simultaneously comes outside of the Gland-plug (40) of the injector (A”) allowing the air to rush into capillary, in order to release its Vacuum, resulting into separation of the Suction-cup (37) from the Piston-head (60). At the completion of injection procedure, the used Hypodermic needle (74) attached at proximal end of the Piston-head (60) is finally retracted and safely encapsulated inside the empty Fluid- cartridge (B), which is finally detached from the injector (A”) and is safely disposed-off. The Injector (A”) finally attains its initial state to become ready for next injection procedure, as shown in Fig. 9(h).

[00111] In case, the prefilled Fluid-cartridge is attached with Injector (A”) to constitute Vacuum operable retractable syringe, the injection procedure becomes quite easy and the operator simply needs to attach the said Fluid-cartridge with Injector (A”), expose and insert the Hypodermic needle into the injection site, and press the Thumb-rest to complete the injection procedure in the like manner.

[00112] Another embodiment of Capillary -injector (A’”) may be employed conveniently for injecting the micro -do sage of injectable Fluid (65’) with a volume of 0.5ml or lesser pre-filled in the Capillary (53’) of Capillary-Fluid-cartridge (B’) between the Piston- head (60’) and the Needle-assembly (70’), as shown in Fig. 10 (a).

[00113] In this case, distal end of the Capillary Fluid-cartridge (B’) is attached at the proximal end of the Capillary-injector (A’”) with the help of its radial beads (51”) and the L- shaped groove (15”) of the Injector (A’”) in the like manner to constitute said Vacuum retractable safety syringe (100’”), as shown in Fig. 10(b). The Tip-guard (75’) of the Capillary Fluid-cartridge is removed to expose its proximal end and the exposed end-tip of Capillary Fluid-cartridge (B’) is placed at injection site at desirable angle, as shown in Fig. 10 (b). When the Thumb-rest (34’) is pressed during the injection process, proximal end of the Collapsible- bulb (38’) resting at the distal end of a Capillary (53’) of Capillary Fluid-cartridge (B’) enters into the Capillary (53’) and acts like a piston. It results into creation of a first Vacuum (V-l) in Injector (A’ ”) between a Gland-plug (40’) and the Piston (31 ’), which goes on increasing with movement of Plunger shaft (30’) in forward direction. The Collapsible-bulb (38’) presses the Piston-head (60’), which in turn presses the Fluid along with Needle-assembly (70’) in forward direction. On further pressing the Thumb-rest (34’), the Hypodermic-needle (74’) moves in forward direction and gently pierces the End-tip bead (74a) and enters into injection site. At this stage, the proximal end of the Needle-hub (70’) moving in forward direction is restricted along with the End-tip bead (74a) by narrow proximal aperture/opening (54’) of Capillary- Fluid-cartridge (B’), which results in the exertion of mounting pressure on Piston-head directly on the pre-filled Fluid itself, consequently, the Fluid (65’) begins rushing in forward direction and injecting into the injection site passing through the Hypodermic-needle (74’) as shown in Figs. 10 (c) and (d).

[00114] On completion of injection procedure, pressure applied on the Thumb-rest (34’) is gradually released, which results in auto-release of the first Vacuum (V-l) and auto movement of Plunger shaft (30’) along with Collapsible -bulb (38’) in backward direction. The Collapsible-bulb (38’) acting like apiston inside the Capillary (53’) sucks the Piston-head (60’) along with the Needle- assembly (70’) in backward direction, resulting into retraction of the Hypodermic-needle (74’) into the Capillary (53’). During this process, with release of the first Vacuum (V-l) and decrease in distance between Plunger shaft-piston (3G) and Gland-plug (40’), the force of attraction between opposite poles of Gland magnet (44’) and Piston-magnet (36’) begins increasing to bring them in close contact of each other. At this stage, the Collapsible-bulb is completely withdrawn from the capillary and the Capillary-injector (A’) attains the initial state to become ready for the next injection procedure as shown in Fig. 10 (e). [00115] The used Hypodermic -needle (74’) is finally retracted and encapsulated inside the capillary in empty Capillary-Fluid-cartridge (B’), which may be detached from the Capillary-injector and safely disposed-off as shown in Fig. 10 (f).

[00116] It is also noteworthy that in this injection procedure, the Hypodermic needle (74’) is not visible at all at any stage.

[00117] The Schematic details of operation of Fluid collecting system are shown in Figs.

11 (a) to (h). [00118] The Injector (A’) discussed in preceding embodiments may be conveniently employed for Fluid collection process. The Injector (A”) may also be employed for the Fluid collection purpose, provided the Plunger shaft (30) does not contain the capillary (32) and the suction cup (37).

[00119] While using the said Injector (A”) without the capillary (32) and the Suction- cup (37) for fluid collection purpose, distal end of the Fluid-collector (C) is attached at proximal end of the Injector (A”), through the beads (81) of the Fluid-collector, by engaging said beads (81) within the L-shaped grooves (15) of Injector (A”), to constitute complete Fluid collection system. On attaching the said Fluid-collector (C) with Injector (A”), an air tight seal is created at the junction between the injector (A”) and the Fluid-collector (C) and also the end-tip of the Plunger shaft (30) comes in close contact of the distal surface of the Piston-head (90) of the Fluid-collector (C), as shown in Fig. 11(b).

[00120] Subsequently, the Breakaway Seal (115) joining the Fluid collecting barrel (80) with Needle-cover (113) is broken and removed with help of a Seal-tab (116), to expose the Hypodermic needle (111), Pressure is exerted on the Thumb-rest (34) to move the Plunger shaft (30) along with the Piston-head (90) in forward direction alongside the Fluid collecting Barrel (80) until the Piston-head touches the internal end of said Fluid collecting Barrel (80) to remove its air from Fluid collector. During this process, a first Vacuum (V-l) is created between the Piston (31) of the Plunger shaft (30) and the Gland -plug (40) inside the Injector (A”) and a second Vacuum (V-2) is created between Ring seal (14) of Injector and Piston-head (90) of Fluid collector (C), as shown in Fig. 11 (c).

[00121] Now, the Slide-switch (23) is slightly pushed in forward direction to arrest movement of the Plunger shaft (30). The needle (111) of Fluid collector (C) is inserted/placed in the Fluid source and the Slide-switch (23) is gently pulled back to gradually release movement of the Plunger shaft (30) in backward direction in order to release the first Vacuum (V-l) in injector (A”) and the second Vacuum (V-2) in the Fluid collecting barrel (80) of the Fluid collector (C). It results in gradual movement of the Plunger shaft (30) along with the Piston-head (90) in backward direction resulting withdrawal of Fluid (65”) from the source into the Fluid-collector (C). As soon as the desired volume of Fluid is withdrawn and collected in the Fluid collecting barrel (80), the Slide-switch (23) is again gently pushed in forward direction to restrict the movement of the Plunger shaft (30), and the needle (111) is withdrawn from the Fluid source. The volume of said Fluid may be well observed and noted through the graduation marks provided on surface of the Fluid collector (C). The needle (111) is then carefully covered with the Needle-cover (113). As soon as the Needle-cover (113) is pressed against the Fluid collecting barrel (80), it slides in backward direction to occupy the space of removed Breakaway Seal (115) on the surface of Fluid collector (C), which results engagement and locking of the Conical Lock-2 (114) with the Conical Lock-1 (112) encapsulating the needle (111) inside the Needle cover (113), as shown in Fig. 11 (d).

[00122] In order to detach the Fluid-collector (C) from the Injector (A”), the Fluid collector is gently rotated in anticlockwise direction, while holding the Injector (A”). The loosened junction allows outer air to rush inside the Fluid collecting barrel (80) to release the second Vacuum (V-2) and to allow movement of the Plunger shaft (30) in backward direction due to release of the first Vacuum (V-l), in order to bring the Injector (A) in initial state. The Fluid-collector (C) containing desired volume of Fluid may now be safely preserved/transported for further processing as shown in Fig. 11 (e).

[00123] Desired volume of the Fluid (65”) contained in the Fluid-collector (C) may be withdrawn and conveniently transferred into the desired container by attaching said Fluid- collector (C) again with the same Injector (A”) in the like manner. For this purpose, when the Needle-cover (113) is removed from the Fluid collecting barrel (80), the needle separates from the Needle Retention Nozzle (84) due to obstruction of Conical Lock-2 (114). Consequently, the needle (111) remains safely locked and encapsulated inside the Needle cover (113), which is never exposed or reused, as shown in Fig. 11 (f) . If required, the user may attach fresh needle with the end tip of Needle-retention-nozzle (84).

[00124] On pressing the Thumb-rest (34) in forward direction, desired volume of the Fluid stored in Fluid collector (C) ejaculates from the Needle-retention-nozzle (84) (or from the hypodermic needle, if separately attached with the nozzle) in usual manner as shown in Fig. 11 (g).

[00125] After withdrawal of fluid stored in Fluid collector, the Needle cover (113) is re capped at proximal end of the Fluid collector before detaching the used Fluid collector for safe disposal.

[00126] The new Hypodermic-needle, if separately attached with the Needle-retention- nozzle during withdrawal of stored fluid from the Fluid-collector is also finally encapsulated inside the Needle cover (113) of Fluid-collector (C) along with previously used Hypodermic needle (111) used during the fluid collection procedure, which may be detached from the Injector (A) and may be safely disposed-off, as shown in Fig. 11 (h).

[00127] Injector (A’) may be employed for Fluid collection process of the predefined volume of Fluid (65”) storable within the whole space available in empty Fluid collector (C) between the Piston-head (90) and proximal end of the Fluid collector (C). The Injector (A’) may be attached with the said empty Fluid collector of the known volume mentioned on its surface in the like manner and the rest of the process employs identical operational steps as described for the Fluid collection process by Injector (A”) in preceding description.

[00128] The Injector (A-l) as shown in Figs. 12 (a) to (e) consists of an Injector barrel (10), a telescopic barrel (18) holding a Plunger shaft (30), and a Plunger shaft retainer (20). [00129] The Injector-barrel (10) of the Injector (A-l) as shown in Figs. 12(a) and (c) is a uniformly hollow, regular cylindrical body opened at both ends; the body being separated into two chambers through an Integrated-gland (12) at the proximal side embedded with O- ring seal-1 (13) at inner surface and a Ring- seal (14) at the proximal end to create a seal with the Fluid-cartridge (B, B’) or Fluid-collector (C).

[00130] Proximal end the Injector-barrel (10) is provided with a rectangular Slot (16) before the Integrated gland (12) as shown in Fig. 12(c) to provide a Slide-switch (23) of Shaft- retainer (20). The Injector-barrel (10) is also provided with the L-shaped grooves (15) to firmly hold the Fluid-cartridge (B, B’) or Fluid Collector (C), during the injection or Fluid collection procedure.

[00131] Distal end of the Injector barrel (10) is provided with a Finger-rest (11) to hold the injector during injection procedure and a Rim (19) to axially hold the Telescopic barrel (18) at its center. Inner diameter of the Rim (19) is slightly greater than outer diameter of the Telescopic barrel (18) to allow its axial movement alongside the Injector barrel (10) in forward and backward direction with help of the Thumb-rest (34) provided at distal end of the Telescopic barrel (18).

[00132] The Rim (19) of the Injector barrel (10) is provided with two equidistant

Slots (19a), as shown in Fig. 12(b), which are oppositely facing to each other and perpendicularly connected with straight, linear and parallel grooves (27a) at the inner surface of Injector-barrel (10) through L-shaped grooves (27) rotatable at 90° angle.

[00133] Inner diameter of the Rim (19) of the Injector-barrel (10) is slightly greater than outer diameter of Telescopic barrel (18) to allow its movement in forward and backward direction with help of the Thumb-rest (34) provided at distal end of the Telescopic barrel (18). [00134] The Telescopic barrel (18), as shown in Fig. 12(d), is a uniformly hollow, regular cylindrical body opened at proximal end. It is closed at distal end and is axially integrated at center with a Plunger shaft (30), which is a straight, uniform and regular rod like structure, axially running parallel to the Telescopic barrel (18) and constituting a Chamber (25) between the Plunger shaft (30) and the Telescopic barrel (18) to hold a Compressible spring (26). The diameter of Plunger shaft throughout its length is slightly lesser than the Integrated- gland (12) and the Ring-seal (14), so as to create an airtight seal with the Fluid-cartridge (B) or Fluid-collector (C) through the O-ring seal-1 (13) embedded with Integrated-gland (12) at its inner surface.

[00135] Distal end of the Telescopic barrel (18) is provided with a Thumb-rest (34) to move the Telescopic barrel (18) alongside the Injector barrel (10) in forward and backward direction. At proximal end, the Telescopic barrel (18) is provided with two equidistant radially arranged beads (18a) at outer surface, just opposite to each other.

[00136] The Beads (18a) are of such dimensions and in such alignment with slots (19a), so that the beads (18a) may conveniently pass through the slots (19a), while fitting the Telescopic barrel (18) inside the Injector-barrel (10) in order to facilitate the sliding movement of Telescopic barrel (18) in forward and backward direction inside the Injector-barrel (10) within its parallel, straight and linear grooves (27a) provided at the internal surface.

[00137] Outer diameters and width of the slots (19a) and the grooves (27) and (27a) are equal to one another but slightly greater than inner diameter of the Injector barrel (10) and the outer diameter of beads (18a), in order to allow convenient passage to the beads (18a) of the Telescopic barrel (10) to fit and movably engage within the oppositely facing straight, linear and parallel Grooves (27a) of Injector-barrel (10), so as to facilitate axial movement of the Telescopic barrel (18) inside the Injector-barrel (10) in forward and backward direction. [00138] While fitting and engaging the Telescopic barrel (18) within the Injector barrel (10), the beads (18a) of the Telescopic barrel (18) are conveniently passed through the Slots (19a) of the Rim (19). The L-shaped grooves (27) facilitate axial rotation of the bead (18a) inside the Injector barrel (10) at 90° angle in clockwise direction, in order to slip and fit the Beads (18a) inside the straight, linear and parallel grooves (27a), to allow axial movement of the Telescopic barrel (18) in forward and backward direction.

[00139] The Plunger shaft retainer (20) consists of a crescent shaped Static brake-fixture (21a) and a Dynamic brake-fixture (21b) with a Compressible sheet (24) sandwiched between them provided with a Central passage (22) for the Plunger shaft (30) to move parallely alongside the Injector barrel (10). A Dynamic brake-fixture (21b) is provided at upper end along with inclined plane surface to house the Slide-switch (23) to control the movement of Plunger shaft (30), as described earlier and shown in Fig. 3(b). A cross-section diagram of this embodiment of Injector (A-l) is shown in Fig. 12(e).

[00140] Another embodiment of a Telescopic Injector (A-2) is shown in Figs. 13(a) to (d) having a slight modification in Injector (A-l).

[00141] In this Telescopic Injector (A-2), the length of the Plunger shaft (30) may be increased keeping the original length of Injector barrel (10) constant in order to suit to the Fluid-cartridges (B, B’) and the Fluid collectors (C) of varying volumes of Fluids with greater length, which require more axial displacement of Plunger shaft (30) in forward direction to accomplish the intended injection of Fluid collection procedure successfully.

[00142] In this embodiment of disclosure, the Thumb-rest (34) provided at the distal end of Telescopic Barrel (18) is removed and it is provided at the distal end of the Extended Plunger shaft (30). The distal end of Telescopic barrel (18) is opened and provided with oppositely facing slots (19a’) in the Rim (19’) connected perpendicularly with L-shaped grooves (27’), rotatable in clockwise direction at the inner surface of the Telescopic barrel (18) exactly in the like manner as described earlier in case of Injector (A-l).

[00143] Beads (30a) are provided at an outer surface and near to distal end of the Plunger shaft (30), just after its extended portion, to hold the Spring (26) in order to facilitate its compression in forward direction. [00144] The exemplary implementation described above is illustrated with specific shapes, dimensions, and other characteristics, but the scope of the disclosure includes various other shapes, dimensions, and characteristics. Also, the Fluid injecting and collecting system as described above could be designed and fabricated in various other ways and could include various other materials and various other Fluid-cartridge, Fluid container, hypodermic needle etc.

[00145] Various modifications to these embodiments are apparent to those skilled in the art from the description and the accompanying drawings. The principles associated with the various embodiments described herein may be applied to other embodiments.

[00146] Therefore, the description is not intended to be limited to the embodiments shown along with the accompanying drawings but is to be providing broadest scope of consistent with the principles and the novel and inventive features disclosed or suggested herein. Accordingly, the disclosure is anticipated to hold on to all other such alternatives, modifications, and variations that fall within the scope of the present disclosure and appended claims.

Claims

We claim:

1. An injector comprising: an Injector barrel (10, 10’), wherein a body of the Injector barrel (10, 10’) is partitioned into two chambers by an Integrated gland (12, 12’) present at a proximal end (P) of the Injector barrel (10, 10’); and a Plunger shaft (30, 30’) configured to move at a central axis of the Injector barrel (10, 10’).

2. The injector as claimed in claim 1, wherein a Collar (38) provided at a proximal end of the Plunger shaft (30) restricts backward motion of the Plunger shaft (30) beyond the Integrated gland (12) of the Injector barrel (10).

3. The injector as claimed in claim 1, wherein the injector is used for injecting and collecting Fluid.

4. The injector as claimed in claim 1, wherein an O-ring seal-1 (13) is embedded on a lateral and inner surface of the Integrated gland (12).

5. The injector as claimed in claim 1, wherein a Ring-seal (14, 14’) is provided at the proximal end of the Injector barrel (10, 10’) and in contact with the Integrated gland (12, 12’) to create a seal with a Fluid-cartridge (B, B’) or a Fluid-collector (C).

6. The injector as claimed in claim 1, wherein L-shaped grooves (15, 15’) are provided at proximal end at the inner surface of the Injector barrel (10, 10’) to firmly hold a Fluid-cartridge (B, B’) or a Fluid Collector (C).

7. The injector as claimed in claim 1, wherein a Finger-rest (11, 11’) is provided at a distal end of the Injector barrel (10, 10’) to hold the injector.

8. The injector as claimed in claim 1, wherein a Thumb-rest (34, 34’) is provided at a distal end of the Plunger shaft (30, 30’) for application of force by a user, and wherein the Thumb-rest (34, 34’) is secured upon a Threaded portion (33, 33’) present at the distal end of the Plunger shaft (30, 30’).

9. The injector as claimed in claim 1, further comprising: a Plunger shaft retainer (20, 20’) positioned behind the Integrated gland (12, 12’), wherein the Plunger shaft retainer (20, 20’) comprises: a crescent shaped Static brake-fixture (21a, 21a’) present in a first semi-cylindrical portion of the Injector barrel (10, 10’); a Dynamic brake-fixture (21b, 21b’) present in a second semi-cylindrical portion of the Injector barrel (10, 10’); and a Compressible sheet (24, 24’) sandwiched between the Static brake- fixture (21a, 21a’) and the Dynamic brake-fixture (21b, 21b’), wherein a Central passage (22, 22’) is present within the Plunger shaft retainer (20, 20’) for allowing axial movement of the Plunger shaft (30, 30’), and wherein the Dynamic brake-fixture (21b, 21b’) has an inclined surface to house a Slide-switch (23, 23’) used for controlling movement of the Plunger shaft (30, 30’).

10. The injector as claimed in claim 9, wherein a Lubricant- soaked foam (17) is positioned next to the Integrated-gland (12), towards the proximal end (P) of the Injector barrel (10).

11. The injector as claimed in claim 10, wherein a Ring-seal-II (14, 14’) is positioned at the proximal end (P) of the Injector barrel (10, 10’), to create a seal with a Fluid- cartridge (B) or a Fluid-collector (C).

12. The injector as claimed in claim 11, wherein a Gland Plug (40, 40’) is provided at a distal end of the Injector barrel (10,

10’), a Gland-magnet-I (44, 44’) and a Gasket-seal (42, 42’) are provided at an outer rim of the Gland-plug (40, 40’), an O-ring Seal-II (43, 43’) is provided at an inner rim of the Gland Plug (40, 40’), and a Support flange (41) is provided at the distal end of the Gland plug (40, 40’) to support airtight fixing and removing the Gland plug (40, 40’) at the distal end of the Injector barrel (10, 10’).

13. The injector as claimed in claim 12, wherein a Piston (31, 31’) is provided around a central point present along a length of the Plunger shaft (30, 30’), and wherein the Piston (31, 31’) extends outwards, towards an inner surface of the Injector barrel (10, 10’) and a Piston-seal (35) is provided at an outer rim of the Piston (31, 31’), to form an air tight seal at the distal end of the Injector barrel (10, 10’).

14. The injector as claimed in claim 13, wherein a Piston-magnet-II (36) is provided on the Piston (31, 31’).

15. The injector as claimed in claim 14, wherein the Plunger shaft (30, 30’) is axially provided with a Capillary (32), and wherein a distal end of the Capillary (32) opens outside the Injector barrel (10, 10’) when the Plunger shaft (30, 30’) is present in an un-pressed condition, and a proximal end of the Capillary (32) has a conical Suction- cup (37).

16. The injector as claimed in claim 15, wherein L-shaped grooves (15) are provided at the inner surface of the proximal end (P) of the Injector barrel (10, 10’), to firmly hold the Fluid-cartridge (B, B’) or Fluid Collector (C).

17. The injector as claimed in claim 14, wherein a straight rod-like Needle-shaft (39’) extends from the piston (31, 31’) towards the proximal end of the Injector barrel (10, 10’), and wherein a proximal end of the Needle-shaft (39’) is provided with an Attachment fixture (37’) at the tip to hold a Collapsible-bulb (38’) made of a resilient soft material to act as a collapsible piston.

18. A Fluid-cartridge comprising: a Fluid-cartridge barrel (50, 50’) including: a hollow cylindrical body having openings at both ends and a conical mouth present at a proximal end (P) of the Fluid-cartridge barrel (50, 50’), wherein the conical mouth constitutes a Cap Retention Fixture (52, 52’) present at an outer surface of the Fluid-cartridge barrel (50, 50’); and radially arranged Retention Beads (51, 51’) provided at a distal end of the outer surface of the Fluid-cartridge barrel (50, 50’) to firmly attach with L- shaped grooves (15, 15’) provided internally at a proximal end of an Injector (A, A' A”, A''', A-1, and A-2); a Piston-head (60, 60’) having a cylindrical disc shape; and a Needle-assembly (70, 70’) including a Hypodermic Needle (74, 74’) affixed at a proximal end of the Fluid-cartridge barrel (50, 50’).

19. The Fluid-cartridge as claimed in claim 18, wherein the Piston-head (60) comprises an O-ring Seal (62) present at the outer rim of the Piston-head (60), and wherein the Piston-head (60, 60’) is sealingly moveable alongside the Fluid-cartridge barrel (50, 50’).

20. The Fluid-cartridge as claimed in claim 18, wherein a centrally protruded Needle Catch Projection (61) is present at a proximal end of the Piston-head (60).

21. The Fluid-cartridge as claimed in claim 20, wherein the Needle- assembly (70) comprises a Needle -hub (78) with a Needle Catch Cavity (72) at a distal end of the Needle-hub (78) to receive and engage with the Needle Catch Projection (61).

22. The Fluid-cartridge as claimed in claim 21, wherein an axial Groove (71) is provided alongside an inner rim of the Needle Catch Cavity (72).

23. The Fluid-cartridge as claimed in claim 21, wherein the Hypodermic Needle (74) distally opens in the Needle Catch cavity (72).

24. The Fluid-cartridge as claimed in claim 21, wherein an inner diameter of the Needle Catch Cavity (72) is equal to an outer diameter of Needle Catch Projection (61) to receive and firmly engage with the Needle Catch Projection (61).

25. The Fluid-cartridge as claimed in claim 21, wherein the Needle-hub (78) is provided with a Collar (77) at distal end of the outer rim to hold a Displacer O-ring seal (73) between the Collar (77) and an inner surface of the Fluid-cartridge barrel (50).

26. The Fluid-cartridge as claimed in claim 25, wherein an inner diameter of a distal end of the Displacer O-ring seal (73) is larger than the outer diameter of the Collar (77) for disengaging the Needle -hub (78) from the O-ring seal (73).

27. The Fluid-cartridge as claimed in claim 25, wherein a Needle cover (75) is used to guard the Hypodermic-needle (74), and wherein a Retention- sleeve (76) is provided at a distal end of the Needle cover (75) to engage with the Cap Retention-fixture (52) of the Fluid-cartridge barrel (50).

28. The Fluid-cartridge as claimed in claim 18, wherein a pre-filled Fluid is stored in a space present between the Piston-head (60) and the Needle-assembly (70) of the pre filled Fluid-cartridge (B).

29. The Fluid-cartridge as claimed in claim 18, wherein graduation marks are provided on a surface of a Fluid-cartridge barrel (50) of empty Fluid-cartridge (B), between the Piston-head (60) and the Needle- assembly (70), for allowing reading of volume of a Fluid aspirated into a space present between the Piston-head (60) and the Needle- assembly (70).

30. A capillary Fluid-cartridge (B’) comprising: a hollow capillary Fluid-cartridge barrel (50’) having a Conical-mouth (55’) at a proximal end; an Axial-capillary (53’) present along a central longitudinal axis of the Fluid- cartridge barrel (50’); a bead-shaped Piston-head (60’) provided at a distal end of the Axial-capillary (53’); and a Needle-assembly (70’) comprising a Hypodermic Needle (74’) at a proximal end of the Axial-capillary (53’), wherein a distal end of the Hypodermic Needle (74’) is fixed in a Needle-hub (78’) and opens distally of the Needle-hub (78’), and wherein the Needle-hub (78’) slides within the Axial-capillary (53’) upon movement of the bead-shaped Piston-head (60’).

31. The capillary Fluid-cartridge as claimed in claim 30, wherein an opening at a proximal end of the Axial-capillary (53’) is provided with a Needle hub-restrictor Flange (54’) comprising an aperture, to restrict axial movement of the Needle- assembly (70’).

32. The capillary Fluid-cartridge as claimed in claim 30, wherein a fixed volume of Fluid (65’) is pre-filled between the Piston-head (60’) and the Needle -hub (78’).

33. The capillary Fluid-cartridge as claimed in claim 30, wherein the volume of the pre- filled Fluid present inside the capillary is mentioned at the surface of Fluid-cartridge Barrel (50’).

34. The capillary Fluid-cartridge as claimed in claim 30, wherein a conical Tip-guard (75’) is provided on a proximal end of the Fluid-cartridge barrel (50’) to be fixed on Retention fixture (52’) for protecting the Hypodermic Needle (74’).

35. A Fluid collector comprising: a Fluid collecting Barrel (80) having a Needle -retention Nozzle (84) at a proximal end of the Fluid collecting Barrel (80), wherein a proximal end of an axial Capillary (83) centrally opens outside the Needle -retention Nozzle (84) and a distal end opens in the Fluid collecting Barrel (80); a Needle-hub (110) removably affixed on the Needle -retention Nozzle (84) and containing a Hypodermic Needle (111); and a Piston-head (90) plugging a distal end of the Fluid collecting Barrel (80) and configured to slide within the Fluid collecting Barrel (80) upon application of force by an injector.

36. The Fluid collector as claimed in claim 35, wherein Conical Lock-2 (114) present at a distal end of a Needle cover (113) allows locking of the Needle cover (113) onto indentations present around the proximal end of the Fluid collecting Barrel (80).

37. The Fluid collector as claimed in claim 36, wherein a Conical Lock-1 (112) is provided at a distal end of the Needle-hub (110), and wherein an inner diameter of the Conical Lock-1 (112) is equal to an outer diameter of the Needle Retention Nozzle

(84).

38. The Fluid collector as claimed in claim 36, wherein a radial Breakaway Seal (115) is used to fasten the Fluid collecting Barrel (80) with the Needle cover (113).

39. The Fluid collector as claimed in claim 38, wherein the Breakaway Seal (115) is provided with a Tab (116) for allowing breaking and removal of the Breakaway seal (115), and wherein removal of the Breakaway seal (115) separates the Needle cover (113) from the Fluid collecting barrel (80) to expose the Hypodermic Needle (111) before a Fluid collection process.

40. The Fluid collector as claimed in claim 35, wherein Retention-beads (81) are provided on the distal end of the Fluid collecting Barrel (80) for firmly engaging with L-shaped grooves (15) of an Injector.

41. The Fluid collector as claimed in claim 35, wherein Graduation-marks (82) are provided on a surface of the Fluid collecting Barrel (80) for allowing measuring volume of a Fluid filled into the Fluid collecting Barrel (80).

42. The Fluid collector as claimed in claim 35, wherein the Piston-head (90) comprises a cylindrical disc provided with O-ring Seals (91) on outer rim of the Piston-head (90).

43. A retractable injection system comprising: an injector comprising: an Injector barrel (10, 10’), wherein a body of the Injector barrel (10, 10’) is partitioned into two chambers by an Integrated gland (12, 12’) present at a proximal end (P) of the Injector barrel (10, 10’); a Plunger shaft (30, 30’) configured to move at a central axis of the Injector barrel (10, 10’), wherein a Thumb-rest (34, 34’) is provided at a distal end of the Plunger shaft (30, 30’), wherein the Thumb-rest (34, 34’) is secured at the distal end of the Plunger shaft (30, 30’), and wherein a Collar (38) provided at a proximal end of the Plunger shaft (30) restricts backward motion of the Plunger shaft (30) beyond the Integrated gland (12) of the Injector barrel (10); and a Ring-seal (14, 14’) positioned towards the proximal end (P) of the Injector barrel (10, 10’), to create a seal with a Fluid-cartridge (B); and the Fluid-cartridge comprising: a Fluid-cartridge barrel (50, 50’) including: a hollow cylindrical body having openings at both ends and a conical mouth present at a proximal end (P) of the Fluid-cartridge barrel (50, 50’), wherein the conical mouth constitutes a Cap Retention Fixture

(52, 52’) present at an outer surface of the Fluid-cartridge barrel (50, 50’); and radially arranged Retention Beads (51, 51’) provided at a distal end of the outer surface of the Fluid-cartridge barrel (50, 50’) to firmly attach with L-shaped grooves (15, 15’) provided internally at a proximal end of the Injector; a Piston-head (60, 60’) having a cylindrical disc shape; wherein the Piston-head (60) is centrally provided with a Needle catch projection (61) at proximal end; and a Needle-assembly (70) including a Hypodermic Needle (74) affixed at a proximal end of the Fluid-cartridge barrel (50), wherein the Needle-assembly (70) comprises a Needle -hub (78) with a Needle Catch Cavity (72) at a distal end of the Fluid-cartridge barrel (50), to receive and engage with a Needle Catch Projection (61) present on a proximal surface of the Piston-head (60), wherein on attachment of the Fluid-cartridge with the Injector, an air tight seal is created at a junction between the injector and the Fluid-cartridge, and an end-tip of a Plunger shaft (30) of the injector comes in close contact of a distal surface of a Piston- head (60) of the Fluid-cartridge.

44. The retractable injection system as claimed in claim 43, wherein filling of Fluid into the Fluid-cartridge barrel (50) requires: attaching L-shaped grooves (15, 15’) provided internally at a proximal end of the Injector with radially arranged Retention Beads (51, 51’) provided at a distal end of the outer surface of the Fluid-cartridge barrel (50, 50’); exposing the Hypodermic needle (74) by removing a Needle guard (75) and placing the Hypodermic needle (74) embedded in the Fluid; exerting pressure on the Thumb-rest (34) configured to move the Plunger shaft (30) in a forward direction, wherein upon movement in the forward direction, the Plunger shaft (30) pushes the Piston-head (60) in the forward direction along-side the Injector barrel (10), and wherein a Vacuum (V) develops between the Ring seal (14) of the injector and the Piston-head (60) of the Fluid-cartridge; and gradually releasing the pressure applied on the Thumb-rest (34), wherein gradually releasing the pressure causes movement of the Piston-head (60) along with Plunger shaft (30) in a backward direction due to release of the Vacuum (V), and wherein the Fluid is aspirated into the Fluid-cartridge (B) with movement of the Piston-head (60) along with Plunger shaft (30) in the backward direction.

45. The retractable injection system as claimed in claim 44, wherein a volume of the Fluid aspirated into the Fluid-cartridge (B) is identified through graduation marks provided on a surface of the Fluid-cartridge (B).

46. The retractable injection system as claimed in claim 44, wherein the Fluid aspirated into the Fluid-cartridge (B) is injected into the injection site by applying force on the Thumb-rest (34).

47. The retractable injection system as claimed in claim 46, wherein upon injecting entire quantity of the Fluid into injection site during injection procedure, the Needle-catch- projection (61) gets inserted into the Needle-catch cavity (72) and attaches the Needle-hub (78) along with Hypodermic-needle (74), and the Displacer O-ring (73) slides in forward direction to set the Collar (70) of Needle-hub (78) free, thereupon the Needle -hub (78) containing the Hypodermic-needle (74) freely moves in the backward direction due to release of the Vacuum (V) on gradually releasing the force applied on the Thumb rest (34 ).

48. The retractable injection system as claimed in claim 47, wherein upon backward movement, the Needle -hub (78) along with the used Hypodermic-needle (74) retracts into the empty Fluid-cartridge and safely encapsulates therein for separation from the Injector and safe disposal; and the Plunger shaft (30) attains initial state to bring the Injector ready for a next injection procedure

49. The retractable injection system as claimed in claim 46, wherein when the Needle- catch-projection (61) begins entering into the Needle-catch cavity (72), the Fluid trapped between the Piston-head (60) and the Needle-hub (78) passes through a Needle-cavity groove (71) provided alongside the inner surface of the Needle Catch Cavity (72).

50. The retractable injection system as claimed in claim 43, further comprising: a Plunger shaft retainer (20, 20’) positioned behind the Integrated gland (12, 12’), wherein the Plunger shaft retainer (20, 20’) comprises: a crescent shaped Static brake-fixture (21a, 21a’) present in a first semi-cylindrical portion of the Injector barrel (10, 10’); a Dynamic brake-fixture (21b, 21b’) present in a second semi- cylindrical portion of the Injector barrel (10, 10’); and a Compressible sheet (24, 24’) sandwiched between the Static brake- fixture (21a, 21a’) and the Dynamic brake-fixture (21b, 21b’), wherein a Central passage (22, 22’) is present within the Plunger shaft retainer (20, 20’) for allowing movement of the Plunger shaft (30, 30’), and wherein the Dynamic brake-fixture (21b, 21b’) has an inclined surface to house a Slide-switch (23, 23’) used for controlling movement of the Plunger shaft (30, 30’).

51. The retractable injection system as claimed in claim 50, wherein the movement of the injector Shaft (30, 30’) is retained in either direction during injection procedure by gently pushing the Slide-switch (23, 23’) in a forward direction, and released by pulling the Slide-switch (23, 23’) in a backward direction .

52. The retractable injection system as claimed in claim 51, wherein gently pushing the Slide-switch (23) retains movement of the injector Shaft (30) by: pressing the Dynamic break-fixture (21b) inwardly to press the Compressible sheet (24) against the Static brake-fixture (21b), wherein pressing of the Compressible sheet (24) against the Static brake- fixture (21b) arrests and restricts movement of the Shaft (30) in either direction.

53. The retractable injection system as claimed in claim 43, wherein a Gland Plug (40, 40’) is provided at a distal end of the Injector barrel (10,

10’); the Plunger shaft (30, 30’) extends to a Piston (31, 31’) present around a central point along a length of the Plunger shaft (30, 30’), thereby forming an air tight seal at the distal end of the Injector barrel (10,10’) between the Piston (31,31’) and the Gland Plug (40,40’); and the Plunger shaft (30) is axially provided with a Capillary (32), a distal end of the Capillary (32) opens outside the Injector barrel (10) when the retractable injection system is present in an un-pressed condition, and a proximal end of the Capillary (32) has a conical Suction-cup (37), and the Suction-cup (37) comes in close contact of the distal surface of Piston-head (60) when the injector and the Fluid-cartridge are connected.

54. The retractable injection system as claimed in claim 53, wherein filling of Fluid into the Fluid-cartridge barrel (50) requires: attaching L-shaped grooves (15,15’) provided internally at a proximal end of the Injector with radially arranged Retention Beads (51,51’) provided at a distal end of the outer surface of the Fluid-cartridge barrel (50,50’); exposing the Hypodermic needle (74) by removing a Needle guard (75) and placing the Hypodermic needle (74) embedded in the Fluid; exerting pressure on a Thumb-rest (34) configured to move the Plunger shaft (30) along with the piston (31) in a forward direction, wherein upon movement in the forward direction: the Plunger shaft(30) pushes the Piston-head (60) in the forward direction, and a first Vacuum (V-l) develops between the Piston (31) and the Gland-plug (40); and the suction cup (37) pushes the Piston-head (60) in the forward direction to create a second Vacuum (V-2) between the Ring-seal (14) and the Piston-head (60), wherein when the distal opening of the capillary (32) comes in contact of the first Vacuum (V-l), air is drawn in from the suction cup (37) through the capillary (32), causing the Suction cup (37) to firmly attach at the distal surface of the Piston- head (60), gradually releasing the pressure applied on the Thumb-rest (34) to cause backward movement of Piston (31) along with the Piston-head (60) due to release of the first Vacuum (V-l) and the second Vacuum (V-2), wherein upon backward movement of the Piston (31) and the Piston-head (60), required volume of Fluid (65) gets filled into the Fluid-cartridge (B) and the volume of Fluid (65) is readable through graduation marks on surface of barrel (50) of the Fluid-cartridge (B).

55. The retractable injection system as claimed in claim 53, wherein releasing of Fluid (65) present in the Fluid-cartridge barrel (50) during an injection procedure requires: inserting the Hypodermic needle (74) into an injection site; exerting pressure on a Thumb-rest (34) configured to move the Plunger shaft (30) along with the piston (31) in a forward direction to release the Fluid through the Hypodermic needle (74), wherein upon movement in the forward direction: the Plunger shaft (30) pushes the Piston-head (60) in the forward direction, and a first Vacuum (V-l) develops between the Piston (31) and the Gland-plug (40); and the suction cup (37) pushes the Piston-head (60) in the forward direction to create a second Vacuum (V-2) between the Ring-seal (14) and the Piston-head (60); wherein when the distal opening of the capillary (32) comes in contact of the first Vacuum (V-l), air from the suction cup (37) is drawn through the capillary (32), causing Vacuum in the Suction cup (37) to firmly attach the Suction cup (37) at the distal surface of the Piston-head (60); wherein gradual increase of pressure on the Piston-head (60) through the Thumb-rest (34) pushes the Fluid (65) of Fluid-cartridge (B) in forward direction to inject the Fluid (65) into the injection site through the Hypodermic needle (74); and wherein when the Piston-head (60) comes in contact of a Displacer O-ring (73), and the Piston-head (60) pushes the Displacer O-ring (73) in the forward direction; the Displacer O-ring (73) begins disengaging from the Needle-hub

(78); the Needle-catch-projection (61) gets inserted into the Needle-catch cavity (72) to firmly attach the Needle-hub (78) along with Hypodermic- needle (74); and the Needle-hub (78) containing Hypodermic-needle (74) gets completely disengaged from the Displacer-O-ring (73) due to its sliding in the forward direction and becomes free to move in a backward direction due to a gap created between an inner surface of Displacer-O-ring (73) and an outer surface of Needle-rim-Collar (77), wherein upon gradual release of the pressure applied on the Thumb-rest (34), the first Vacuum (V-l) and the second Vacuum (V-2) begin releasing to retract the Hypodermic needle (74) attached with Piston-head (60), whereby the Piston-head (60) containing the Hypodermic needle (74) gradually retracts along with the Plunger shaft (30) in the backward direction, and the used Hypodermic needle (74) retracts and encapsulates inside the empty Fluid-cartridge (B), which is detached from the Injector for disposal, and wherein the Plunger-shaft (30) attains initial position, the distal end of Capillary (32) exposes to air behind the Gland-plug (40), which rushes into Suction cup (37) to release the Vacuum in the Suction cup (37), resulting into detachment of the suction cup (37) from the distal surface of Piston-head (60), and to bring the Plunger shaft (30) in initial state to make the Injector ready for next injection procedure.

56. A retractable injection system comprising: an injector including: an Injector barrel (10’), wherein a body of the Injector barrel (10’) is partitioned into two chambers by an Integrated gland (12’) present at a proximal end (P) of the Injector barrel (10’); a Plunger shaft (30’) configured to move at a central axis of the Injector barrel (10’); a Gland Plug (40’) provided at a distal end of the Injector barrel (10’); a Gland-magnet-I (44’) and a Gasket-seal (42’) provided at an outer rim of the Gland-plug (40’); an O-ring Seal-II (43’) provided at an inner rim of the Gland Plug

(40’); a Support flange (41’) provided at the distal end of the Gland plug (40’) to support airtight fixing and removing the Gland plug (40’) at the distal end of the Injector barrel (10’); a Piston (31’) embedded with a Piston magnet-II (36’) facing the Gland-magnet-I (44’) with opposite pole being provided around a central point present along a length of the Plunger-shaft (30’); a straight rod-like Needle-shaft (39’) extending from the piston (31’) towards the proximal end of the Injector barrel (10’), wherein a proximal end of the Needle-shaft (39’) is provided with an Attachment fixture (37’) at the tip to hold a Collapsible -bulb (38’) made of a resilient soft material to act as a collapsible piston; a Thumb-rest (34’) provided at a distal end of the Plunger shaft (30’) for application of force by a user; a Finger-rest (11’) provided at a distal end of the Injector barrel (10’) to hold the injector; and a Ring-seal (14, 14’) provided at the proximal end of the Injector barrel (10’) and in contact with the Integrated gland (12’) to create a seal with a Fluid-cartridge (B, B’) or a Fluid-collector (C), and a capillary Fluid-cartridge including: a hollow capillary Fluid-cartridge barrel (50’) having a Conical-mouth (55’) at a proximal end; an Axial-capillary (53’) present along a central longitudinal axis of the Fluid-cartridge barrel (50’); a bead-shaped Piston-head (60’) provided at a distal end of the Axialcapillary (53’); and a Needle-assembly (70’) comprising a Hypodermic Needle (74’) covered with a Tip-guard (75’), present at a proximal end of the Axialcapillary (53’), wherein a distal end of the Hypodermic Needle (74’) is fixed within a through hole of a Needle -hub (78’), wherein proximal end of the Hypodermic Needle (74’) is closed with an End-tip bead (74a) having diameter higher than an aperture of Needle hub- restrictor Flange (54’) of the Axial capillary (53’), wherein a particular volume of Fluid (65’), mentioned at the surface of Fluid-cartridge barrel (50’), is filled between the bead-shaped Piston-head (60’) and the Needle-assembly(70’), wherein the Fluid (65’) along with the Needle-hub (78’) containing the Hypodermic needle (74’) slides in forward direction within the Axial-capillary (53’) upon movement of the bead-shaped Piston-head (60’) in forward direction resulting the proximal end of Hypodermic needle (74’) to protrude out of the proximal end mouth (54’) of the Axial capillary (53’) piercing through the End-tip bead (74a), and wherein F-shaped grooves (15’ ) provided at the inner surface of the Injector barrel (10’) firmly hold the capillary Fluid-cartridge through radial beads (51’ ) present on a distal end of the capillary Fluid-cartridge.

57. The retractable injection system as claimed in claim 56, wherein a Plunger shaft retainer (20’) is positioned behind the Integrated gland (12’), and wherein the Plunger shaft retainer (20’) comprises: a crescent shaped Static brake-fixture (21a’) present in a first semi- cylindrical portion of the Injector barrel (10’); a Dynamic brake-fixture (21b’) present in a second semi-cylindrical portion of the Injector barrel (10’); and a Compressible sheet (24’) sandwiched between the Static brake- fixture (21a’) and the Dynamic brake-fixture (21b’), wherein a Central passage (22’) is present within the Plunger shaft retainer (20’) for allowing movement of the Plunger shaft (30’), wherein the Dynamic brake-fixture (21b’) has an inclined surface to house a Slide- switch (23’) for controlling movement of the Plunger shaft (30’).

58. The retractable injection system as claimed in claim 56, wherein injecting the Fluid (65’) present within the Axial-capillary (53’) into injection site requires: attaching the Capillary Fluid-cartridge (B’) at the proximal end of Capillary injector (a) through Radial beads (51’ ) of said Capillary Fluid-cartridge (B’) into the L-shaped grooves (15’ ) of the Capillary injector (a); removing the Tip-guard (75’) covering the Hypodermic needle (74’); placing the End-tip (54’) of the Capillary Fluid-cartridge (B’) in close contact of the intended injection-site; exerting pressure on the Thumb-rest (34’) configured to move the Plunger shaft (30’) along with the piston (31’) in a forward direction to release the Fluid through the Hypodermic needle (74’), wherein upon movement in the forward direction: the proximal end of the Collapsible-bulb (38’) resting at the distal end of the Capillary (53’) enters into the Capillary (53’) to act like a piston, and a Vacuum (V-l) is developed between the Gland-plug (40’) and the Piston (31’), the Collapsible -bulb (38’) presses the Piston-head (60’) and forces the Fluid along with the Needle-assembly (70’) in a forward direction, wherein the Hypodermic -needle (74’) upon moving in a forward direction pierces the End-tip bead (74a) and enters into the injection site, wherein the movement of End-tip bead (74a) and the Needle-hub (70’) is restricted by an aperture of End-tip (54’) of the Capillary Fluid-cartridge (B’), further exertion of pressure on the thumb-rest (34’) directly presses the Piston-head (60’) on the Fluid (65’), which in turn is forced to pass through the Hypodermic needle (74’) into the injection site, when all of the Fluid (65’) is injected into the injection site, the proximal end of Piston-head (60’) comes in close contact of distal end of the Needle-hub (78’) with no space therebetween, gradually withdrawing the pressure applied on the Thumb-rest (34’) to cause: release of the Vacuum (V-l) created between the Gland-plug (40’) and the Piston (31’), wherein release of the Vacuum (V-l) causes the Plunger-shaft (30’) to move in backward direction along with the Collapsible-bulb (37’) which sucks the Piston-head (60’) and the Needle-hub (78’) along with the used Hypodermic needle (74’) in backward direction, wherein upon such backward movement the used Hypodermic needle (74’) retracts and gets encapsulated into the empty Capillary (53’) of the Capillary Fluid-cartridge (B’) for safe disposal, and wherein the opposite pole of Piston magnet-II (36’) of (Piston (31’) while moving in backward direction comes closer to and is attracted by opposite pole of the Gland magnet-I (44’) of the Gland-plug (40’) to bring the Collapsible -bulb (37’) in initial state, thereby getting the Capillary injector (a) ready for a next injection procedure.

59. The injector as claimed in claim 1, wherein the injector further comprises: a hollow and cylindrical telescopic barrel (18) housing the Plunger shaft (30); a Finger-rest (11) on a distal end of the Injector barrel (10) for holding the injector, wherein the Finger-rest (11) projects outwards and perpendicular to the Injector barrel (10); a Rim (19) present at the distal end of the Injector barrel (10), wherein the Rim (19) is provided with two equidistant Slots (19a) projecting inwardly and perpendicularly connected with straight, linear, and parallel grooves (27a) at the inner surface of the Injector barrel (10) through L-shaped grooves (27) rotatable at 90° angle and holding the Telescopic barrel (18) through beads (18a) present at proximal ends of the Telescopic barrel (18); a Compressible spring (26) disposed in a chamber (25) defined between the Plunger shaft (30) and the Telescopic barrel (18); and a Thumb-rest (34) provided at a distal end of the Telescopic barrel (18) to move the Telescopic barrel (18) alongside the Injector barrel (10) in a forward direction.

60. The injector as claimed in claim 59, wherein the Plunger shaft (30) and the Telescopic barrel (18) coalesce at the Thumb-rest (34), and wherein upon application of force on the Thumb-rest (34), the Telescopic barrel (18) moves inside the Injector barrel (10) in forward direction and compresses the Compressible spring (26) which expands upon the release of the force applied on the Thumb-rest (34) to bring the Telescopic barrel (18) and the Plunger shaft (30) in an initial state.

61. The injector as claimed in claim 59, wherein an inner diameter of the Rim (19) is greater than an outer diameter of the Telescopic barrel (18). 62. The injector as claimed in claim 59, wherein two equidistant radially arranged beads (18a) opposite to each other are provided at outer surface of the proximal end of the Telescopic barrel (18).

63. The injector as claimed in claim 59, wherein outer diameters and width of the slots (19a) and the grooves (27a) are equal and/or greater than the inner diameter of the Injector barrel (10) and the outer diameter of beads (18a), for allowing axial movement of the Telescopic barrel (18) inside the Injector barrel (10).

64. The injector as claimed in claim 59, wherein the Plunger shaft (30) comprises: an extended portion present outside a distal end of the Telescopic barrel (18) and ending up into the Thumb-rest (34); a remaining portion present inside the Telescopic barrel (18); and two equidistant beads (30a) present at a junction between the extended portion and the remaining portion of the Plunger shaft (30), wherein the beads (30a) project outwards, disposed inside the Telescopic barrel (18), and engage with inwardly projecting Slots (19a’) of the Rim (19’) to retain the remaining portion of the Plunger shaft (30) inside the Telescopic barrel (18), a Rim (19’) present at the distal end of the Telescopic barrel (18), wherein the Rim (19’) is provided with two equidistant Slots (19a’) projecting inwardly and perpendicularly connected with straight, linear, and parallel grooves (27a’) at the inner surface of the Telescopic barrel (18) through L-shaped grooves (27’) rotatable at 90° angle and holding the Plunger-shaft (30) through beads (30a) present at a junction between the extended portion and the remaining portion of the Plunger shaft (30); wherein upon application of force on the Thumb-rest (34), the extended portion of the Plunger shaft (30) moves inside the Telescopic barrel (18) in forward direction and compresses the Compressible spring (26), which expands to attain an initial state upon release of the force applied on the Thumb-rest (34).

65. The injector as claimed in claim 64, wherein an inner diameter of the Rim (19’) is greater than an outer diameter of the Plunger- shaft (30).

66. The injector as claimed in claim 65, wherein the Beads (30a) have a predefined dimension to conveniently pass through the slots (19a’), while fitting the Plunger- shaft (30) inside the Telescopic barrel (18) to facilitate sliding movement of the Beads (30a) of the Plunger-shaft (30) within linear grooves (27a’) provided at internal surface of the Telescopic barrel (18).

67. The injector as claimed in claim 66, wherein outer diameters and width of the slots (19a’) and the grooves (27a’) are equal and greater than the inner diameter of the Telescopic -barrel (18) and the outer diameter of beads (30a), for allowing axial movement of the Plunger-shaft (30) inside the Telescopic barrel (18).

68. The injector as claimed in claim 67, wherein a Plunger shaft retainer (20) is positioned behind the Integrated gland (12), and the Plunger shaft retainer (20) comprises: a crescent shaped Static brake-fixture (21a) present in a first semi- cylindrical portion of the Injector barrel (10); a Dynamic brake-fixture (21b) present in a second semi-cylindrical portion of the Injector barrel (10); and a Compressible sheet (24) sandwiched between the Static brake- fixture (21a) and the Dynamic brake-fixture (21b), wherein a Central passage (22) is present within the Plunger shaft retainer (20) for allowing movement of the Plunger shaft (30), and wherein the Dynamic brake-fixture (21b) has an inclined surface to house a Slide-switch (23) for controlling movement of the Plunger shaft (30).

69. The injector as claimed in claim 68, wherein a rectangular Slot (16) is provided before the Integrated gland (12) to house the Slide-switch (23).

70. The injector as claimed in claim 60, wherein L-shaped grooves (15, 15’) are provided at the inner surface of a proximal end of the Injector barrel (10) to lock with radial beads (51, 81) present on a distal end of Fluid-cartridge (B) and Fluid-collector (C) respectively.