CN214485233U

CN214485233U - Syringe with a needle

Info

Publication number: CN214485233U
Application number: CN202022085910.8U
Authority: CN
Inventors: J-P·乌尔德里; N·亨里; J-M·阿曼
Original assignee: Sucre Ltd
Current assignee: Sucre Ltd; Socorex Isba SA
Priority date: 2019-04-12
Filing date: 2019-08-21
Publication date: 2021-10-26
Anticipated expiration: 2029-08-21
Also published as: CN211301528U; DE202019102126U1

Abstract

The present invention relates to a syringe for automatic refill of continuous and/or repeated administration liquids and which is reusable. The syringe includes an actuation assembly, a handle, a housing, a cartridge, and a plunger. The housing also includes a liquid inlet aperture, a liquid outlet aperture, and a liquid transfer channel. The syringe further comprises an inlet connector for attaching the inlet valve assembly to said liquid inlet aperture and an outlet connector for attaching the outlet valve assembly to said liquid outlet aperture. The inlet valve assembly and/or the outlet valve assembly are provided as detachable, separate entities or units.

Description

Syringe with a needle

The application is a divisional application of a utility model patent application with the application date of 2019, 8 and 21 months, the application number of 201921362417.7 and the name of a utility model of a syringe.

Technical Field

The present invention relates to veterinary medical devices, in particular syringes, such as continuous syringes. The present invention also relates to syringes configured for continuous, repeated use. The present invention also relates to a syringe for veterinary use and/or for animal health.

Background

Veterinarians or farmers often require syringes when treating animals. When the number of animals in large-scale farming is high and vaccination is required at different stages of animal growth, repeated injections of the drug must be made. The breeder or veterinarian then does not need to change the medication or vaccine agent as often as the injector is used. Due to the large workload, frequent refilling of the medicament must be avoided frequently and the treatment must be accelerated by continuous dispensing. To date, continuous syringes on the market have not been designed for small volumes. They generally have the disadvantages of being complex in structure, heavy in weight in the case of metal, partially or not removable, hardly autoclavable and of limited use in the case of plastic materials. Their poor design often leads to hand fatigue and difficulty in achieving adequate filling for good performance when they are used in small volumes. A single small part as a valve component is easily lost when disassembled for cleaning.

The present invention aims to solve the drawbacks of the prior art and provide a continuous injector for animal health, veterinary use and agriculture, which has a more rational design, better ergonomics, simpler structure and is more convenient to use and maintain.

SUMMERY OF THE UTILITY MODEL

In one aspect, the present invention provides a syringe that is self-refilling and reusable for continuous and/or repeated administration of a liquid, comprising an actuation assembly, a handle, a housing, a cartridge and a piston, wherein the cartridge and the piston are held by the housing, and wherein the piston is connected to the actuation assembly to allow aspiration and administration of the liquid by actuation of the actuation assembly, the housing further comprising: a liquid inlet hole through which liquid can be sucked and introduced into the cartridge; a liquid outlet aperture through which the liquid can be ejected from the cartridge by actuation of the actuation assembly; a liquid transfer channel for directing the liquid into and out of the cartridge. The syringe further comprises: an inlet connector for attaching an inlet valve assembly to the liquid inlet aperture; an outlet connector for attaching an outlet valve assembly to the liquid outlet aperture, wherein the outlet connector is configured to connect a needle to the syringe. The inlet valve assembly and/or the outlet valve assembly are provided as detachable separate entities or units.

In one embodiment, the inlet valve assembly and/or the outlet valve assembly comprises a plurality of assembled components.

In one embodiment, the assembled components are stably assembled, connected and/or retained in the inlet valve assembly and/or the outlet valve assembly.

In one embodiment, the inlet valve assembly comprises a first valve housing having a first through-passage, a first resilient member and a first valve plug/valve ball received in the first through-passage, wherein the first resilient member is arranged in the first valve housing to act on the first valve plug/valve ball and close the first through-passage.

In one embodiment, the outlet valve assembly comprises a second valve housing having a second through-passage, a second resilient member and a second valve plug/ball received in the second through-passage, wherein the second resilient member is arranged in the second valve housing to act on the second valve plug/ball and close the second through-passage.

In one embodiment, the geometry of the first valve housing and the second valve housing is designed for determining the orientation and positioning of the inlet valve assembly and the outlet valve assembly, respectively, wherein the inlet valve assembly and the outlet valve assembly are mechanically and/or structurally coded and/or matched to the first valve housing and the second valve housing, respectively.

In one embodiment, the first valve housing comprises one or more first geometries, and wherein the liquid inlet opening, the liquid outlet opening, the inlet connector and the outlet connector comprise a geometry-related and/or structure-related configuration or coding which is provided in such a way that the inlet valve assembly can be mounted at the liquid inlet opening and only in the correct orientation, but not at the liquid outlet opening.

In one embodiment, the second valve housing comprises one or more second geometries, and wherein the liquid inlet aperture, the liquid outlet aperture, the inlet connector and the outlet connector comprise a geometry-related and/or structure-related configuration or coding arranged in such a way that the outlet valve assembly can be mounted at the liquid outlet aperture and only in the correct orientation, but not at the liquid inlet aperture.

In one embodiment, the syringe further comprises an outlet valve assembly having a mechanical coding, which functions as a check valve and is inserted into a matching groove located inside the front end of the housing or the liquid outlet hole.

In one embodiment, the inlet valve assembly and the outlet valve assembly are color coded or lettered.

In another aspect, the present invention provides an injector comprising an actuation assembly, a handle, a housing for holding a cartridge for aspirating and administering a liquid by actuating the actuation assembly, the housing further comprising: a liquid inlet aperture; a liquid outlet aperture; a liquid transfer channel for directing the liquid into and out of the cartridge, the injector further comprising: an inlet connector for attaching an inlet valve assembly to the liquid inlet aperture; an outlet connector for attaching an outlet valve assembly to the outlet bore, wherein the outlet connector is configured to connect a needle to the syringe.

In yet another aspect, the present invention provides an injector comprising an actuation assembly, a handle, a housing for holding a cartridge for aspirating and administering a liquid by actuating the actuation assembly, the housing further comprising: a liquid inlet hole through which liquid can be sucked and introduced into the cartridge; a liquid outlet aperture through which the liquid can be ejected from the cartridge by actuation of the actuation assembly; a fluid delivery channel for directing the fluid into and out of the cartridge, the injector further comprising: an inlet connector for attaching an inlet valve assembly to the liquid inlet aperture; an outlet connector for attaching an outlet valve assembly to the outlet bore, wherein the outlet connector is configured to connect a needle to the syringe.

In yet another aspect, the present invention provides a syringe that is automatically refillable and reusable for continuous and/or repeated administration of a liquid, comprising an actuation assembly, a handle, a housing, a cartridge and a plunger, wherein the cartridge and the plunger are retained by the housing, and wherein the plunger is connected to the actuation assembly to allow aspiration and administration of the liquid by actuation of the actuation assembly, the housing further comprising: a liquid inlet aperture through which liquid can be drawn into and directed into the cartridge, a liquid outlet aperture through which the liquid can be ejected from the cartridge by actuation of the actuation assembly for directing the liquid into and out of a liquid delivery passage of the cartridge, the injector further comprising: an inlet connector for attaching an inlet valve assembly to the liquid inlet bore, an outlet connector for attaching an outlet valve assembly to the liquid outlet bore, wherein the outlet connector is configured to connect a needle to the syringe, wherein at least the cartridge, piston and housing are detachably assembled parts of the syringe, the handle and housing are mainly made of plastic, and the syringe is autoclavable at a temperature of 121 ℃ or higher when fully assembled.

In one embodiment, the syringe includes a housing nut for attaching the housing to the handle such that unscrewing of the housing nut allows the housing and cartridge to be removed from the handle and the piston to be separated from the actuation assembly.

In one embodiment, the syringe further comprises a volume adjustment socket removably connected to the handle, wherein the actuation assembly is removably connected to the handle through the volume adjustment socket.

In one embodiment, the inlet valve assembly and/or the outlet valve assembly are provided as detachable, independent entities or units.

In one embodiment, the inlet valve assembly comprises a first valve housing comprising a first through-passage, a first resilient member and a first valve plug/valve ball received in the first through-passage, wherein the first resilient member is arranged in the first valve housing to act on the first valve plug/valve ball and close the first through-passage.

In one embodiment, the outlet valve assembly comprises a second valve housing comprising a second through-passage, a second resilient device and a second valve plug/ball received in the second through-passage, wherein the second resilient device is arranged in the second valve housing to act on the second valve plug/ball and close the second through-passage.

In one embodiment, the outlet valve assembly comprises a second valve housing or body comprising one or more geometries, and wherein the liquid inlet aperture, the liquid outlet aperture, the inlet connector and the outlet connector comprise a geometrical and/or structural configuration or coding arranged in such a way that the outlet valve assembly can be mounted at the liquid outlet aperture and only in the correct orientation, but not at the liquid inlet aperture.

In one embodiment, the syringe has an adjustable volume, and wherein the nominal volume of the syringe is 0.5ml or less.

In one embodiment, the handle comprises or is associated with an upper or body portion comprising: a connector receptacle for attaching the housing to the handle by means of a housing nut, wherein the housing is configured to connect to the connector receptacle at one or more re-determined angular positions.

In one embodiment, the connector receptacles of the housing and the upper or body portion are geometrically and/or structurally configured to connect and/or assemble with respect to each other at an angular position selectable from a plurality of predetermined angular positions.

In one embodiment, the housing comprises a serrated sleeve, and wherein the connector receptacle comprises one or more protrusions that match gaps provided in the serrated sleeve, wherein the position of the one or more protrusions determines the angular position of the housing relative to the connector receptacle.

In one embodiment, the outlet connector includes a forward end including a luer lock nozzle configured to allow a needle to be connected to the outlet connector.

In one embodiment, the handle includes an upper portion or body portion including vial connector engagement structure for removably connecting a vial connector to the syringe at the vial connector engagement structure.

In one embodiment, the injector is provided with a separate vial connector configured to releasably connect to the injector at the vial connector engagement structure.

In one embodiment, the vial connector engagement structure comprises a groove, and wherein the vial connector comprises a guide rail for receipt in the groove.

In one embodiment, the vial connector comprises an extension or pin, wherein the extension or pin is configured to be retained by a housing nut when the vial connector is connected to the vial connector engagement structure, wherein the housing nut is further configured to connect the housing to the handle.

In one embodiment, the upper or body portion includes a connector receptacle for attaching the housing to the handle, wherein the connector receptacle includes a recess for receiving the extension or pin, wherein the housing nut is configured to extend at least partially over the extension or pin when the housing nut is secured to the connector receptacle so as to retain the extension or pin and thereby the vial connector at the vial connector engagement structure of the upper or body portion.

In one embodiment, the syringe is configured for complete disassembly and reassembly.

In a further aspect, the present invention provides an injector suitable for automatic refilling and/or continuous injection of animal health, the injector comprising an actuation assembly, a return spring, a handle, a three-way housing, a separate valve assembly, a cartridge, a piston, an inlet connector, an output connector and a needle, wherein the actuation assembly is connected to the piston via the handle and comprises a push rod, wherein the return spring is sleeved on said rod of the actuation assembly, wherein the piston and the cartridge are contained in said housing, and the needle may be connected at a front end of the housing.

In some embodiments, the inlet valve assembly and/or the outlet valve assembly are provided as detachable, separate entities or units.

In some embodiments, wherein the inlet valve assembly and/or the outlet valve assembly comprises a plurality of assembled components. Preferably, the components are stably assembled, connected and/or retained in the valve assembly. Thus, if the syringe is disassembled, the individual components and/or parts of the valve assembly remain connected together, thus avoiding loss of the individual components and/or parts.

In some embodiments, the surface of the cartridge is provided with a precise scale, thereby enabling adjustment of the volume to be injected.

In some embodiments, the intermediate portion of the push rod and the return spring are sleeved in a volume adjustment socket, and the front portion of the volume adjustment socket is secured in a fine adjustment opening or a fine adjustment socket provided in the handle. In some embodiments, a fine tuning lock nut is disposed on the fine tuning socket.

In some embodiments, the piston comprises a rear end and the push rod comprises a front end, and wherein the rear end of the piston is adapted to be connected to the front end of the push rod. Preferably, the piston includes a recess at the rear end for receiving the front end of the push rod.

In some embodiments, the present disclosure provides a syringe assembly comprising the syringe and a vial holder, wherein the syringe is configured for attaching the vial holder to the syringe. The syringe may be supplied with liquid from a vial on the vial holder via an inlet conduit connected to the vial holder. Alternatively, the inlet conduit may be connected directly to the external reservoir, at the option of the user.

Other aspects and preferred embodiments of the invention are defined hereinafter and in the appended claims.

Other features and advantages of the present invention will become apparent to those skilled in the art from the description of the exemplary and/or preferred embodiments given below. These embodiments are provided by way of example and are not intended to limit the invention to the particular embodiments shown in the drawings and described below.

Drawings

Fig. 1 is a side view of a syringe according to one embodiment of the present invention.

Fig. 2 is a perspective exploded view of the syringe shown in fig. 1.

Fig. 3 is a perspective exploded view of the forward end of the housing and valve assembly of the syringe shown in fig. 1 and 2.

Fig. 4A and 4B are front and longitudinal sectional views, respectively, of the outlet valve assembly (top) and the inlet valve assembly (bottom) of the syringe shown in fig. 1 and 2.

Fig. 5A and 5B are side and rear perspective views, respectively, of the handle of the syringe shown in fig. 1 and 2 and a vial connector adapted to be releasably connected to the syringe.

Detailed Description

The present invention relates to syringes for injecting injectable liquids such as drugs, vaccines, nutrients such as vitamin solutions and the like. Preferably, the syringe is generally envisaged for veterinary use and/or in the field of animal health.

The syringe is preferably configured for repeated injections of a specific volume of liquid. Thus, the syringe preferably comprises a liquid inlet through which liquid can be repeatedly drawn into the cartridge of the syringe by the piston and then ejected through the outlet and needle for injection into the animal. The inlet is preferably connected to a reservoir of liquid so that the same syringe comprising the same needle can be used repeatedly to repeatedly inject a specific amount of the same liquid, e.g. for continuously administering the liquid contained in the reservoir to a plurality of animals.

Referring to fig. 1 and 2, the injector 1 for veterinary use comprises an actuation assembly 25, the actuation assembly 25 comprising actuation means, such as a button 23 and an actuation rod or push rod 24. The syringe further comprises a return spring 3, a handle 6, a housing 12, a piston 8 and an outlet connector 16, the outlet connector 16 comprising a luer lock nozzle 41 for connecting the needle 19 to the outlet connector 16.

The push rod 24 is accommodated in the handle 6, in particular in an upper body or upper part 31 of the handle. In the assembled syringe, the piston 8 is connected to the push rod 24. The upper body 31 includes a tubular passage through which the ram 24 passes when the syringe is assembled.

The return spring 3 is installed in the middle portion of the push rod 24. The piston 8 and the cartridge 10 are located in a housing 12.

The surface of the cartridge 10 is provided with graduations or graduations for allowing volume adjustment. For example, the position of the O-ring 9 provided on the piston 8 may be used as a volume indication together with the scale. The cartridge 10 is preferably transparent, for example made of pyrex, and the O-ring 9 may be provided in an easily distinguishable, light or striking colour, so as to be visible through said cartridge 10.

A luer lock nozzle 41 for the needle 19 is connected to the forward end of the housing 12, and in particular is included in the outlet connector 16.

For the purposes of this specification, the term "front" or "forward end" refers to the end, side, part or movement that is directed towards the needle 19 when the syringe is assembled, while the term "rear" is used to point towards the end, side, orientation, etc. of the button 23 of the syringe. Furthermore, a distinction can be made between "upstream" and "downstream" with respect to the orientation according to the direction of the liquid flow, where "downstream" refers to a position relatively closer to the ejection of the liquid at the needle 19, and "upstream" refers to a position closer to the reservoir of the liquid to be injected.

The push rod 25 and the intermediate and rear sections of the return spring 3 are nested in the volume adjustment socket 4. The front of the volume adjusting socket 4 is fixed in the rear opening or rear hole of the handle 6. In the illustrated embodiment, the body portion 31 of the handle 6 includes a through hole or passage that includes a first or rear opening in which the internal threads 29 are disposed (fig. 5B). The volume adjusting socket 4 preferably comprises an external thread for screwing into the internal thread 29 at the rear opening of the body part 31.

In one embodiment, the syringe is an adjustable volume syringe comprising a volume adjustment assembly 4, 5 for adjusting the volume of liquid over a range of volumes. By screwing in or out the volume adjustment socket 4 relative to the rear opening or bore of the handle 6, the specific volume to be injected can be adjusted within an adjustable volume range.

The volume adjustment socket 4 comprises a volume adjustment nut 5. A volume adjusting nut is preferably screwed onto the external thread of the volume adjusting socket 4. When the volume adjustment nut is tightened to make contact with the rear end of the body portion 31 (at the rear opening), the entire volume adjustment socket 4 is blocked in place and volume is adjusted. To change the adjusted volume, the user may loosen the volume adjusting nut 5, which again makes it possible to screw/unscrew the volume adjusting socket 4 with respect to the upper part 31 and thus adjust the volume to be injected.

The thrust ring (or travel stop ring) 2 engages at a specific longitudinal position on said thrust rod 25 (fig. 2). Furthermore, the front end of the volume adjusting socket 4 comprises a narrowing rim 27. A spring 3 is housed in said volume adjustment socket 4 in order to press the actuation assembly 25 and thus also the piston to a rear or rest position in which there is no pressure exerted by the user on the button 23. The thrust ring 2 abutting the narrowed rim 27 limits the rearward/retraction stroke of the push rod 25, thereby defining the rest position. The forward stroke of the actuating assembly 25 during liquid ejection is limited by a stroke stop inside the housing 12. Thus, the front abutment position of the piston stroke is fixed, while the rear abutment position can be adjusted by screwing the volume adjustment socket 4, thereby allowing volume adjustment.

The piston 8 is arranged in the cartridge 10, thereby providing a piston/cylinder assembly effective for sucking and ejecting liquid. Thus, there is a seal provided in the form of a gasket (e.g. an O-ring) 11 for providing the required ejection and suction when the user actuates and releases the actuation assembly 25 respectively, the O-ring 11 being attached in a circular groove on the piston 8.

The push rod 24 is attached to the piston 8 via a recess provided in the rear end of the piston 8. The front end of the push rod comprises a geometry, e.g. a protrusion/recess matching a recess in the rear end of the piston, for enabling a connection in the longitudinal direction along the piston axis. The housing 12 is secured to the handle 6 using a main or housing nut 7.

In one embodiment, the injector comprises a housing nut 7 for attaching said housing 12 to said handle 6, such that unscrewing of said housing nut 7 allows removing and/or disassembling said housing 12 from the handle 6 and optionally also said cartridge 10. Preferably, removing the housing nut 7 also allows the piston 8 to be separated from the actuating assembly 25.

In one embodiment, the injector further comprises a volume adjustment socket 4 detachably connected to said handle 6, wherein said actuation assembly 25 is detachably connected to said handle 6 through said volume adjustment socket 4.

In one embodiment, the handle 6 comprises and/or is associated with a body portion 31, the body portion 31 comprising: a connector socket 32 for attaching the housing 12 to the handle 6 by means of a housing nut 7, wherein the housing 12 is configured to connect to the connector socket 32 at one or more predetermined angular positions.

In one embodiment, the housing 12 and the connection socket 32 of the body portion 31 are geometrically and/or structurally configured to connect and/or assemble with respect to each other at an angular position selectable from a plurality of predetermined angular positions.

In one embodiment, the housing 12 includes a serrated sleeve 34, and wherein the connector receptacle 32 includes one or more protrusions 36, the protrusions 36 mating with gaps provided in the serrated sleeve, wherein the position of the one or more protrusions 36 determines the angular position of the housing 12 relative to the connector receptacle 32. As can be seen from fig. 2, the connector socket 32 comprises a sleeve comprising an external thread which matches an internal thread of the housing nut 7 and thus allows the housing nut 7 to be screwed onto the threaded sleeve of the connector socket 32. The protrusions 36 are provided in the inner surface of the sleeve. On the other hand, the serrated sleeve 34 of the housing 12 is received as a male portion within the sleeve of the connector receptacle acting as a female portion. The toothed teeth and projections of the toothed sleeve 34 and the sleeve 21, respectively, are provided to prevent any angular positioning of the housing 12 relative to the sleeve 6 and in particular relative to the upper portion 31 thereof.

Thus, the user can change the angular position of the housing 12 relative to the handle 6 by using corresponding grooves and protrusions provided on both sides.

The fixing of said angular position causes any blocking of the rotation of the casing 12 with respect to the handle, once the casing 12 is inserted in the connection socket 32, even before the casing nut 7 is tightened.

A container (not shown) containing the liquid to be injected may branch off at the inlet connector 16 via a flexible duct or conduit 17 to the front of the housing 12.

Referring to fig. 3, the outlet valve assembly 14 with the mechanical coding is inserted into a mating groove located inside the front or outlet bore 22 of the housing 12. An outlet connector 16 including a luer lock nozzle 41 (for needle attachment) is attached to the forward end of outlet bore 22 to tightly compress and retain outlet valve assembly 14 in the valve assembly housing provided by the outlet connector 16 and the outlet bore 22 when both are preferably threadedly connected. In the embodiment shown, the outlet connector 16 has a nut-like structure and comprises an internal thread matching an external thread provided at said outlet hole 22.

There is a suitable liquid transfer passage in the front of the housing 12 to allow liquid transfer and dispensing when the syringe is in use.

One or both of the inlet and outlet valve assemblies are preferably one-way valves. As shown in fig. 4B, the inlet valve assembly 13 and the outlet valve assembly 14 each include a through hole or

passage

13d and 14d, respectively.

In one embodiment, the inlet valve assembly 13 comprises a first valve housing 13a (which comprises a first through passage 13d), a first resilient member 13c and a first valve plug/valve ball 13b received in the first through passage 13d, wherein the first resilient member 13c is arranged in the first valve housing 13a so as to act on the first valve plug/valve ball 13b and close the first through passage 13 d.

In one embodiment, the outlet valve assembly 14 includes a second valve housing 14a (which includes a second through passage 14d), a second resilient member 14c, and a second valve plug/ball 14b received in the second through passage 14d, wherein the second resilient member 14c is disposed in the second valve housing 14a to act on the second valve plug/ball 14b and close the second through passage 14 d.

As can also be seen from fig. 4B, each individual/one-

club cartridge valve

13 and 14 comprises a valve housing or

valve body

13a, 14a, a sealing plug 13B, 14B, preferably made of an elastomeric material, and a

metal spring

13c, 14 c.

In the shown embodiment the elastic/

metal springs

13c, 14c are acting in traction. At one end, each

spring

13c, 14c is connected to a

respective plug

13b, 14b, and at the other end of the spring, the springs are connected to a valve body or

valve housing

13a, 14a, respectively.

In this way, the spring here acts by traction on the plug in the direction of closing the respective valve, thus providing the one-way valve.

When the inlet valve assembly 13 is secured in the housing provided by the inlet bore 21 and the inlet connector 15, the through bore 13d of the inlet valve assembly 13 connects the bottom passage (not shown) of the housing 12 to the supply or feed port or inlet hose mount 26 of the inlet connector 15. The inlet valve assembly 13 is tightly pressed at both ends between the inner housing contact surface of the connector 15 and the inlet aperture 21 of the outer housing 12.

When the outlet valve assembly 14 is secured in the housing provided by the outlet bore 22 and the outlet connector 16, the through bore 14d of the outlet valve assembly 14 connects the front passage (not shown) of the housing 12 to the luer lock nozzle of the outlet connector 16.

The two ends or extremities of outlet valve assembly 14 are tightly pressed between the inner housing contact surface of outlet connector 16 and outlet bore 22 of outer housing 12.

The housings for the

valve assemblies

13, 14 are provided by an inlet connector 15 and a side inlet port 21 and an outlet connector 16 and outlet port 22, respectively. The geometry of the valve assembly housing is designed to minimize dead volume to provide optimal dispensing performance and priming.

Preferably, the geometry of the valve assembly housing is designed to determine the orientation and positioning of the valve assembly. To this end, the valve assembly and the corresponding housing are preferably mechanically and/or structurally coded and/or matched, similar to the components of the splice and/or the plug and socket assembled together. Preferably, each valve assembly has a downstream side and an upstream side, and the mechanical coding allows to determine the correct insertion with respect to these sides and to insert a specific valve assembly into a predetermined one of the two housings, for example the inlet valve assembly into a housing provided specifically for the inlet valve assembly.

In one embodiment, the outlet valve assembly 14 comprises a valve body 14a comprising one or more geometries 14e, and wherein the inlet bore 21, the outlet bore 22, the inlet connector 15 and the outlet connector 16 comprise a geometry-related and/or structure-related configuration and/or coding provided in such a way that the outlet valve assembly 14 can be mounted only at the outlet bore 22 and preferably only in the correct orientation.

In one embodiment, the outlet valve assembly 14, preferably the valve body 14a of the outlet valve assembly 14, comprises one or more protrusions 14e having a first geometry, and wherein the outlet orifice 22 comprises one or more recesses 22e matching the first geometry, thereby selectively allowing a correct and/or predetermined positioning of the outlet valve assembly 14 relative to the outlet orifice.

In one embodiment, the inlet valve assembly 13 comprises a valve housing or valve body 13a comprising one or more geometries 13e, and wherein the inlet aperture 21, the outlet aperture 22, the inlet connector 15 and the outlet connector 16 comprise a geometrically and/or structurally configured arrangement provided in such a way that the inlet valve assembly 13 can be mounted only at the inlet aperture 21, but not at the outlet aperture 22, and preferably only in the correct orientation.

In one embodiment, the inlet valve assembly 13, and preferably the valve body 13a of the inlet valve assembly 13, comprises one or more protrusions 13e having a second geometry, and wherein the inlet aperture 21 comprises one or more recesses matching the second geometry, thereby selectively allowing a correct and/or predetermined positioning of the inlet valve assembly 13 relative to the inlet aperture.

In one embodiment, the outlet bore 22 and the outlet connector 16 provide a housing specific to the outlet valve assembly 14, wherein the housing includes a geometry, such as an outer diameter, mechanical coding, etc., that preferably matches the shape of the outlet valve assembly 14 in such a way that the outlet valve assembly 14 is configured to be assembled in the outlet valve housing only in a predetermined orientation, and preferably will not be assembled in the housing provided for the inlet valve assembly.

In one embodiment, the inlet aperture 21 and the inlet connector 15 provide a housing dedicated to the inlet valve assembly 13, wherein the housing comprises a geometry, such as an outer diameter, a mechanical coding, etc., which preferably matches the shape of the inlet valve assembly 13 in such a way that the inlet valve assembly 13 is configured to be assembled in the inlet valve housing only in a predetermined orientation, and preferably not in the housing provided for the outlet valve assembly.

It should be noted that in this specification, an exemplary inlet and outlet valve assembly is shown, which includes a valve housing or body, a valve spring, and a valve plug. Other valve types may be used and may be modified in accordance with the present invention to provide the features and advantages described herein. For example, a valve assembly using a valve ball may be employed. Additionally or alternatively, a valve assembly may be used in which the valve passage is closed by a pushing force (rather than a pulling force) provided by a resilient member such as a spring. Yet another variation covered by the present invention is the use of resilient members other than springs. Finally, the present invention encompasses the use of other valve types, for example, valves without an elastomeric component, and possibly a valve plug. Preferably, the valve assembly is self-contained and provided in an assembly element such that individual parts or components of the valve assembly are not easily lost but remain together. This facilitates maintenance and reduces component loss during disassembly of the syringe, for example for maintenance.

Preferably, since the direction of liquid delivery is to be controlled by the valve assemblies, the valve assemblies are marked or geometrically configured in a manner to avoid, prevent or prevent mis-positioning of the valve assemblies in their respective housings. Instead of or in addition to the geometric matching shapes provided to enable correct positioning and prevent or hinder incorrect positioning of the valve assembly in the valve housing and also to prevent confusion between valves, other means may be used, such as colour coding on the assembly, inscriptions etc.

In a preferred embodiment, the inlet and outlet valve assemblies have (at least slightly) different opening characteristics, and/or the valve assemblies comprise different resilient members. Thus, preferably, the inlet valve assembly and the outlet valve assembly are not placed in a housing provided for the respective other valve.

In one embodiment, the outlet connector 16 includes a forward end that includes a luer lock nozzle 41, the luer lock nozzle 41 configured to allow a needle 19 to be connected to the outlet connector 16. Preferably, the luer lock nozzle 41 and more preferably the entire outlet connector 16 is made of metal.

Fig. 5A and 5B illustrate the handle 6 and a vial holder or vial connector 46, the vial holder 46 configured for connection to the injector 1 at the handle. A vial (not shown), such as a vial containing a (liquid) medicament, may be secured to the vial holder 46. To this end, for example, the vial holder 46 includes external threads 49 for securing a vial protection device or retaining device including internal threads by screwing. For example, such vial protection devices may take the form of a band, plastic bottle, socket, or cylinder. The external threads 49 may also be provided with retaining means for screwing the vial onto the vial holder 46.

In one embodiment, the handle 6 includes an upper or body portion 31 that includes a vial connector engagement structure 44 for releasably and/or detachably connecting a vial connector 46 to the injector 1 at the connector engagement structure 44.

In one embodiment, injector 1 is provided with a separate vial connector 46, the vial connector 46 being configured to releasably connect to the injector at the connector engagement structure 44. Preferably, the connector engagement structure 44 is provided at the upper or body portion 31 of the handle, more preferably exposed from the upper side of the upper or body portion 31.

In one embodiment, the vial connector engagement structure 44 includes a groove 45 and the vial connector 46 includes a guide 47 for receipt in the groove 45.

In one embodiment, the vial connector 46 includes an extension or pin 48, wherein the pin is configured for retention by the housing nut 7 when the vial connector 46 is connected to the vial connector engagement structure 44, wherein the nut is further configured to connect the housing 12 to the handle 6.

In one embodiment, the upper or body portion 31 includes a connector receptacle 32 for attaching the housing 12 to the handle 6, wherein the connector receptacle 32 includes a recess 42 for receiving the pin 48, wherein the housing nut 7 is configured to extend at least partially over the pin 48 when the housing nut 7 is secured to the connector receptacle 32 so as to retain the pin 48 and thereby the vial connector 46 at the vial connection structure 44 of the body portion 31. A recess 42 is preferably provided in the handle 6 and preferably extends to the connector socket 32.

The handle 6 and in particular the upper body 31 comprises a branch 44, which branch 44 comprises a groove or groove-shaped recess 45 (fig. 2). Vial holder 46 includes a guide 47 for insertion through the channel by a translationally guided motion.

Vial connector 46 is blocked in place in recess 45 by main nut 7. A first opening of a feed conduit or tube 17, for example made of rubber, may be connected to the outlet hose mount 43 of the vial holder 46 and a second opening of the conduit 17 may be connected to the inlet hose mount 26 of the inlet connector 15.

Alternatively, without the use of vial holder 46, a sinker or suction sinker 18 may be connected to the first end of tubing 17, and tubing 17 may thus be inserted into a receptacle, such as a bottle, containing the liquid to be injected.

In one embodiment of the invention, one or more of the group comprising the following components are made of plastic: the handle 6, the housing 12, the actuation means 23 of the actuation assembly 25, and the inlet connector 15. Preferably, one or more of the main nut 7, the volume adjustment socket 4, the volume adjustment nut 5 and the actuating means 23 are also made of plastic. Preferably, some of the components are made of metal. In one embodiment, one or more of the group comprising the following components are made of metal, preferably stainless steel or plated brass: push rod 24, thrust ring 2, piston 8, and outlet connector 16. Generally, the syringe as a whole is considered to be a syringe made substantially of plastic, although some components include metal components.

In one embodiment of the invention, the syringe has a nominal (maximum) volume of 0.5ml (milliliters) or less. For example, typical nominal volumes for exemplary syringes are 0.1ml, 0.2ml, 0.3ml, 0.4ml and 0.5 ml. The injector preferably has an adjustment range within which the volume to be injected can be adjusted by the user. For example, in the case of a syringe with a nominal volume of 0.2ml, the adjustment range may be 0.0 to 0.2 ml. In other embodiments, the syringe may have a minimum volume, such as 0.01 or 0.02ml, displayed or derivable from the volume scale, such that the adjustment range starts from a value greater than 0 up to the nominal volume, such as a range of 0.02 to 0.5 ml.

In one embodiment of the invention, the syringe is adapted to be continuously refilled and/or to continuously, and/or to successively and/or repeatedly inject an adjusted amount of liquid. Thus, the injector is an "auto refill injector" in which, during use of the injector, a user releasing the button 23 after an injection causes liquid to be drawn from a liquid reservoir (e.g. from a vial) into the cartridge 10. Subsequent actuation of the button 23 causes injection of the liquid through the needle 19 and subsequent release causes the liquid to be drawn into the cartridge again. Such automatic refill syringes are known, for example, from veterinary medicine and/or animal health, in which liquid is administered in successive and/or repeated administration actions.

Preferably, the syringe 1 is not a disposable and/or single-use syringe. Preferably, the syringe is reusable.

In one embodiment of the invention, the injector comprises a plurality of detachably mounted components. Preferably, the housing 12, the housing nut 7 and the handle 6 are detachably assembled parts of the syringe.

In one embodiment, the injector comprises a

volume subassembly

8, 10, 12 comprising a cartridge 10, a piston 8 and a housing 12, wherein said

volume subassembly

8, 10, 12 is removably mounted in and/or is a removably mounted subassembly of said injector.

Preferably, the cartridge 10 and the piston 8 are also detachably assembled parts of the injector.

Preferably, the actuation assembly 25 is also a detachably assembled part of the syringe 1. In one embodiment, the volume adjustment socket 4, the actuating assembly 25 and the spring 3 are detachably assembled into an actuating and

volume adjustment subassembly

3, 4, 25. The syringe is described. Preferably, the actuation and

volume adjustment subassemblies

3, 4, 25 are detachably assembled subassemblies of the syringe. The

sub-assemblies

3, 4, 25 preferably also include a thrust ring 2 and may be disassembled by removing the thrust ring 2 from the actuator rod 24.

In one embodiment, the syringe is configured for complete disassembly and reassembly and/or is suitable for multiple uses.

In particular, the user can disassemble the syringe, for example, into all the parts shown in fig. 2, in order to clean the parts, in particular those coming into contact with the liquid to be administered.

Preferably, the adjustment socket 4, the spring 3 and the actuating assembly 25 are configured for assembly without disassembly or disassembly during general disassembly and maintenance.

Preferably, disassembling the syringe, for example by removing the member, may be done manually by the user, preferably without the use of tools. In particular, the user may unscrew the housing nut 7, allowing the housing 12, cartridge 10 and piston 8 to be removed from the handle 6 and actuation assembly 25. Similarly, the volume adjustment socket 4 and/or the inlet and

outlet connectors

15 and 16 may be removed by the user, preferably manually, most preferably by unscrewing. Removal of the inlet and

outlet connectors

15 and 16 allows removal of the

valve assemblies

13 and 14, respectively. After opening the housing screw 7, removing the volume adjustment socket 4 allows the actuation assembly 25 to be removed from the handle 6.

Preferably, the

valve assemblies

13 and 14 are not provided for disassembly by the user into their components 13a-13c and 14a-14 b. Preferably, the valve assembly is provided for unitary use and, if required, is replaced in its entirety, as a single piece. The valve assembly is not specifically designed to enable such disassembly, although it is not necessarily technically impossible to disassemble the components 13a-13c and 14a-14 c. As a result, valve performance may be adversely affected by such disassembly and reassembly of the valve member, or the member may be damaged.

In one embodiment of the present invention, the syringe 1, when fully assembled, may be autoclaved at 121 ℃ or higher. The material from which the syringe is made is selected to allow for said autoclaving. In one embodiment, the fully assembled syringe may be autoclaved at 125 ℃.

Compared with the prior continuous injector, the injector of the utility model has the following advantages and characteristics:

an automatic refill syringe with a spring-loaded plunger and a three-way valve system,

at least 4 types are available, for example, 0.1ml, 0.2ml, 0.3ml and 0.5ml,

allowing easy injection of extremely small volumes up to 0.02ml, while improving handling and reducing weight,

the volume can be easily set using micro-screws and lock nuts,

a strong or solid cartridge with a fine volume scale,

autoclaving (20 min) at 121 ℃ when fully assembled,

good chemical resistance to various water and oil-based vaccines used in the veterinary field,

a reliable syringe, easy to clean and maintain, comprising interchangeable spare parts, including available graduated glass cartridges.

While certain preferred embodiments of the present invention have been described and specifically exemplified above, it is not intended that the present invention be limited to these embodiments. Various modifications may be made thereto without departing from the scope and spirit of the invention as set forth in the following claims.

List of reference numerals

1. Syringe with a needle

2. Thrust ring for preventing retraction stroke

3. Reset spring

4. Volume adjusting socket

5. Volume setting nut

6. Handle comprising an upper body with a socket for a housing

7. Shell nut

8. Piston with grooves for O-rings (0.1ml, 0.2ml, 0.3ml) or precision ground piston without grooves (0.5ml)

O-ring 9

10. Cartridge with volume scale

11. Gasket for cartridge

12. A housing including a housing for the inlet and outlet valve assemblies, threads for the inlet and outlet connectors, a front piston travel stop, a cartridge window, and a slot for angular positioning with respect to the handle

13. An inlet valve assembly (or inlet valve body) comprising a valve housing, a spring and elastomer plug, through

holes

13a, 13b, 13c, 13d

14. An outlet valve assembly (or outlet valve body) comprising a valve housing, a spring and elastomer plug, a through bore and

mating structure

14a, 14b, 14c, 14d, 14e

15. Inlet connector

16. Outlet connector with luer lock nozzle

17. Feed pipe

18. Sinking ball

19. Needle head

20. Pipeline sinking ball for supplementing pipeline feeding

21. Inlet opening of a housing

22. Outlet opening of the housing

22e. matching recesses

23. Actuating device/push button

24. Actuating lever

25. Actuating assembly

26. Mounting for pipe mounting at inlet connector

27. Narrowed edge

29. Internal thread for a volume adjusting socket

31. Upper or main part of the handle

32. Connector socket or receptacle

34. Serrated sleeve

36. Protrusion

41. Luer lock nozzle

42. Recess in handle 2

43. Outlet hose fitting

44. Medicine bottle connector joint structure

45. Groove

46. Vial holder or vial connector

47. Guide rail

48. Extensions or pins

49. External threads for attaching a vial protector or holder.

Claims

1. A syringe (1) which is self-refilling and reusable for continuous and/or repeated administration of a liquid, comprising an actuation assembly (25), a handle (6), a housing (12), a cartridge (10) and a piston (8), wherein the cartridge (10) and the piston (8) are held by the housing (12) and wherein the piston (8) is connected to the actuation assembly (25) to allow aspiration and administration of the liquid by actuation of the actuation assembly (25), the housing (12) further comprising:

a liquid inlet hole (21) through which liquid can be sucked and introduced into the cartridge (10),

a liquid outlet opening (22) through which the liquid can be ejected from the cartridge (10) by actuation of the actuation assembly (25),

a liquid transfer channel for guiding the liquid into and out of the cartridge (10), the injector (1) further comprising:

an inlet connector (15) for attaching an inlet valve assembly (13) to the liquid inlet aperture (21),

an outlet connector (16) for attaching an outlet valve assembly (14) to the liquid outlet aperture (22), wherein the outlet connector (16) is configured to connect a needle to the syringe,

it is characterized in that

The inlet valve assembly (13) and/or the outlet valve assembly (14) are provided as detachable separate entities or units.

2. Syringe (1) according to claim 1, characterized in that the inlet valve assembly (13) and/or the outlet valve assembly (14) comprise a plurality of assembled components (13a-13 d; 14a-14 c).

3. Syringe (1) according to claim 2, characterized in that the assembled components (13a-13 d; 14a-14c) are stably assembled, connected and/or retained in the inlet valve assembly (13) and/or in the outlet valve assembly (14).

4. Syringe (1) according to any one of claims 1 to 3, characterized in that the inlet valve assembly (13) comprises a first valve housing (13a) having a first through-passage (13d), a first elastic means (13c) and a first valve plug/ball (13b) housed in the first through-passage (13d), wherein the first elastic means (13c) is provided in the first valve housing (13a) so as to act on the first valve plug/ball (13b) and close the first through-passage (13 d).

5. Syringe (1) according to claim 4, characterized in that the outlet valve assembly (14) comprises a second valve housing (14a) having a second through passage (14d), a second elastic means (14c) and a second valve plug/ball (14b) housed in the second through passage (14d), wherein the second elastic means (14c) is provided in the second valve housing (14a) so as to act on the second valve plug/ball (14b) and close the second through passage (14 d).

6. Syringe (1) according to claim 5, characterized in that the geometry of the first and second valve housings (13a, 14a) is designed to determine the orientation and positioning of the inlet valve assembly (13) and outlet valve assembly (14), respectively.

7. Syringe (1) according to claim 6, characterized in that the first valve housing (13a) comprises one or more first geometries (13e) and in that the liquid inlet orifice (21), the liquid outlet orifice (22), the inlet connector (15) and the outlet connector (16) comprise a geometrical and/or structural configuration or coding provided in such a way that the inlet valve assembly (13) can be mounted at the liquid inlet orifice (21) and only in the correct orientation, without being mounted at the liquid outlet orifice (22).

8. Syringe (1) according to claim 6, characterized in that the second valve housing (14a) comprises one or more second geometries (14e) and in that the liquid inlet hole (21), the liquid outlet hole (22), the inlet connector (15) and the outlet connector (16) comprise a geometrical and/or structural configuration or coding provided in such a way that the outlet valve assembly (14) can be mounted at the liquid outlet hole (22) and only in the correct orientation, without being mounted at the liquid inlet hole (21).

9. Syringe (1) according to any one of claims 1 to 3, characterized in that the syringe (1) also comprises an outlet valve assembly (14) with mechanical coding, the outlet valve assembly (14) acting as a non-return valve and being inserted in a matching groove located inside the front end of the casing (12) or the liquid outlet orifice (22).

10. Syringe (1) according to any one of claims 1 to 3, characterized in that the inlet valve assembly (13) and the outlet valve assembly (14) are marked in a colour-coded or inscription manner.