JP2008104776A - Container-cum-syringe - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To observe the state of medical liquid before injection well, and to surely prevent the medical liquid from projecting from an injection needle so as to inject the medical liquid to a human body at ease. <P>SOLUTION: The container-cum-syringe 1 comprises: a cylinder 2 where a bypass path 2a is formed; front and rear stoppers 5a and 5b fitted to a rear chamber 2c on the rear side of the bypass path 2a for liquid-tightly sealing the medical liquid m filled in the rear chamber 2c; a cylinder tip 3 provided with a lure point 3a and fitted to the front end of the cylinder 2; a finger grip 4 fitted to the rear end of the cylinder 2; and a plunger rod 6 connected to the rear stopper 5b. The length L of the bypass path 2a is longer than the front stopper 5a, the length L2 of a front chamber 2b is set longer than the mutual distance L3 of the front and rear stoppers 5a and 5b in the rear chamber 2c, and a movable valve 9 for mitigating the flow of the medical liquid m from the front chamber 2b to the distal end side of the lure point 3a and making it pass through is provided inside the through-hole 3f of the lure point 3a. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a container-use syringe provided with a movable valve inside a luer at the end of a cylinder fitted to the tip of a cylinder.

Conventionally, a cylinder, a front stopper and a rear stopper, which are fitted on the front and rear end sides of the cylinder and seal the chemical liquid filled in the cylinder, and a front stopper A cylinder chamber provided with a bypass chamber into which the needle enters and a luer tip for attaching a syringe needle at the tip thereof, a finger grip fitted to the rear end of the cylinder, and inserted into the cylinder from the rear end of the cylinder A plunger rod connected to the rear stopper, and when in use, the rear stopper is pushed by the plunger rod and the front stopper is pushed forward together with the chemical solution. By entering the inside, the liquid medicine sealed between the front and rear stoppers The seal on the tip side is released and the gas flows out from the cylinder into the bypass chamber, flows through the gap between the front stopper and the bypass chamber, and is guided to the inner surface of the lure tip along the bypass groove provided on the inner wall of the bypass chamber. A container-use syringe that is introduced into a syringe needle is known (see, for example, Patent Document 1 and Patent Document 2).
Japanese Examined Patent Publication No. 62-58745 Japanese Patent Laid-Open No. 8-148101

  However, in the container / syringe, the unsealed drug solution flows into the bypass chamber from the cylinder, and is narrow between the outer peripheral surface of the front stopper that has previously entered the bypass chamber and the bypass groove. Since it is guided to the injection needle through the gap, there is a problem that the state immediately before the injection of the liquid medicine injected into the human body cannot be seen well including bubbles.

  The present invention has been made in view of the above circumstances. It is possible to observe well the state of the drug solution before injection and to reliably prevent the drug solution from protruding from the injection needle. It is an object of the present invention to provide a container-use syringe that can inject a medical solution into a human body.

The present invention is characterized by the following points in order to solve the above problems.
That is, the container-use syringe according to claim 1 is made of a transparent material, and has a cylinder formed with a bypass passage formed by bulging the cylinder wall outward in an axial intermediate portion, and a cylinder on the rear side of the bypass passage. The front and rear stoppers are fitted in the rear chamber with a gap in the axial direction and the liquid medicine filled in the rear chamber is sealed in a liquid-tight manner. A cylinder tip having a base end fitted to the outer periphery of the front end of the cylinder, a finger grip provided on the outer periphery of the rear end of the cylinder, and the rear portion inserted into the cylinder from the rear end of the cylinder A container-use syringe including a plunger rod connected to a stopper, wherein the length of the bypass path of the cylinder is set to be longer than the axial length of the front stopper. The length of the front chamber of the cylinder on the front side of the bypass path is set to be longer than the distance between the front stopper and the rear stopper separated by the chemical solution in the rear chamber of the cylinder. A movable valve that relaxes and allows the flow of the chemical solution from the cylinder to the tip side of the luer tip is provided inside the through hole that is formed to communicate with the cylinder.

  The container-use injector according to claim 2 is the container-use injector according to claim 1, wherein the movable valve is a circular plate having a diameter smaller than the inner diameter of the through-hole of the luer tip, and the outer peripheral portion thereof is the through-hole. The outer periphery of the through hole is oriented perpendicular to the axial direction of the through hole, and the outer peripheral portion thereof is connected to the inner wall surface of the through hole by a single point support. It is characterized by being provided so as to be swingable.

The present invention has the following excellent effects.
According to the container-combined syringe of claim 1, the chemical solution whose front seal has been released by the front stopper being pushed into the position of the bypass path of the cylinder is transferred from the rear chamber of the cylinder behind the bypass path to the bypass path. Since the entire amount enters the front chamber of the cylinder on the front side of the bypass passage, the state of the liquid medicine before injection, which is difficult to see in the cylinder tip of the conventional container-use syringe, is transparent in the front chamber of the cylinder, including bubbles. The air bubbles remaining in the front chamber can be completely discharged to the outside through the injection needle, and the liquid medicine can be injected into the human body with peace of mind. Further, as described above, when the front stopper is pushed into the position of the bypass path of the cylinder, when the chemical solution whose front side is released passes through the bypass path and enters the front chamber, it passes through the narrow passage of the bypass path. The chemical solution flows into the through-hole of the lure tip from the front chamber at once, but the movable valve effectively relaxes the flow of the chemical solution in the through-hole, thus reliably preventing the water gun phenomenon that the chemical solution protrudes from the tip of the injection needle can do.

  Further, according to the container combined syringe according to claim 2, since the movable valve can swing back and forth through the through-hole of the luer tip, not only the injection of the drug solution but also the flashback of the blood can be seen without any trouble. And the structure is simple and can be easily manufactured.

Hereinafter, a container-use syringe according to an embodiment of the present invention will be described with reference to the accompanying drawings.
In FIG. 1, reference numeral 1 denotes a container-use syringe according to an embodiment of the present invention. The container-use syringe 1 is fitted to a cylinder 2, a cylinder tip 3 fitted to the outer periphery of the front end (left end in FIG. 1) of the cylinder 2, and an outer periphery of the rear end (right end of FIG. 1) of the cylinder 2. The finger grip 4 made of synthetic resin and the chemical liquid m filled in the cylinder 2 are sealed between each other, and is provided in the cylinder 2 so as to be reciprocated by being inserted into the cylinder 2 with an interval in the axial direction. Front stopper 5a and rear stopper 5b, and a plunger rod which is inserted into the cylinder 2 from the rear end thereof, the front end portion is connected to the rear stopper 5b, and the rear stopper 5b is reciprocated in the axial direction of the cylinder 2. 6, an injection needle 7 attached to a luer tip 3 a provided at the tip of the tube tip 3, and a protector 8 that covers the injection needle 7.

  The cylinder 2 is made of a transparent glass cylinder, and is provided with one bypass passage 2a formed by bulging a part of the cylinder wall in the middle portion slightly closer to the front than the center in the axial direction. The front side (left side in FIG. 1) of the bypass path 2a is a front chamber 2b, and the rear side (right side in FIG. 1) of the bypass path 2a is a rear chamber 2c, both of which have the same inner diameter. The length L of the passage 2a1 in the axial direction of the cylinder 2 of the bypass passage 2a is longer than the axial length (thickness) L1 of the front stopper 5a, for example, 1.3 times the axial length of the front stopper 5a. It is set to 1.7 times.

The front and rear stoppers 5a and 5b each have an outer diameter slightly larger than the inner diameter of the cylinder 2, and are formed of an elastic material made of a material such as rubber for medical drugs. 5a is positioned slightly rearward from the rear end of the bypass passage 2a in the rear chamber 2c, and the rear stopper 5b is spaced rearward from the front stopper 5a so as to be within the rear chamber 2c of the cylinder 2 between them. It is positioned at a position where it can be filled with a volume of chemical solution m, and is inserted into the rear chamber 2c, and the chemical solution m filled in the rear chamber 2c is sealed.
The volume of the front chamber 2b of the cylinder 2 is slightly larger than the volume of the chemical solution m filled between the front and rear stoppers 5a and 5b in the rear chamber 2c. The axial length (length) L2 is set to be longer than the distance L3 between the rear stoppers 5a and 5b before being separated by the chemical solution m in the rear chamber 2c.

The tube tip 3 is formed by molding with a transparent synthetic resin material, and has a cylindrical base end portion 3b closed at the front side, the luer tip 3a coupled to the front end of the base end portion 3b, and the lure A luer lock portion 3c that is coupled to the front end of the base end portion 3b with a space outside the tip 3a. The fitting hole 3d formed inside the base end portion 3b has a front end at the bottom 3e. By inserting the cylinder 2 until it comes into contact, the tube tip 3 is liquid-tightly fitted to the front end portion of the cylinder 2. The luer tip 3a is provided with a through-hole 3f that penetrates back and forth on its axis and opens the inner end side to the bottom 3e of the base end 3b and communicates with the front chamber 2b of the cylinder 2. .
The luer lock portion 3c is provided with a lock screw 3g for locking the base of the injection needle 7 and an annular groove 3h for locking the protector 8. The tube tip 3 may be formed as a tube tip not provided with the luer lock portion 3e.

The flow of the chemical solution m from the front chamber 2b of the cylinder 2 to the distal end side of the luer tip 3a is reduced in the through hole 3f of the luer tip 3a at a position close to the bottom 3e side of the base end portion 3b. A movable valve 9 is provided.
As shown in FIGS. 2 and 3, the movable valve 9 has a thin circular plate 9a whose diameter is smaller than the inner diameter of the through hole 3f and is perpendicular to the axis of the through hole 3f. An annular gap e is arranged between the inner wall surface and one point (lower end portion in FIG. 3) of the outer peripheral portion is connected to the inner wall surface of the through-hole 3f by a support piece 9b at one point support. Is provided so as to be swingable forward and backward in the axial direction of the through hole 3f (left and right in FIG. 2).
The movable valve 9 is made of the same material as that of the tube tip 3, and is usually molded integrally when the tube tip 3 is molded. However, the movable valve 9 may be formed separately and bonded with an adhesive or the like.

  A ring-shaped protrusion 2d is provided on the outer peripheral portion of the front end of the cylinder 2, and the protrusion 2d is fitted into a ring-shaped groove 3i formed at the front end of the fitting hole 3d of the tube tip 3. As a result, the cylinder tip 3 is fitted in a gas-tight and liquid-tight manner to the front end portion of the cylinder 2, and similarly, a ring-shaped protrusion 2e is provided on the outer peripheral portion of the rear end of the cylinder 2, and the protrusion 2e is The finger grip 4 is fitted into a ring-shaped groove 4 b formed in the cylindrical hole 4 a of the finger grip 4 and is firmly fitted to the outer peripheral portion of the rear end of the cylinder 2. The finger grip 4 may be formed integrally with the cylinder 2 instead of being fitted to the cylinder 2.

Next, the effect | action of the container combined use syringe 1 which concerns on one embodiment of this invention is demonstrated, referring FIG.
In the container / syringe 1 having the above-described configuration, when the container / syringe 1 is used, first, as shown in FIG. 4 (a), the plunger / rod 6 is slowly pushed through the rear stopper 5b from the state shown in FIG. Then, the chemical solution m in the rear chamber 2c is sent to the front side of the cylinder 2 to push the front stopper 5a into the position of the bypass path 2a of the cylinder 2. At this time, since the front seal of the chemical solution m by the front stopper 5a is released, the chemical solution m flows into the front chamber 2b on the front side of the front stopper 5a through the passage 2a1 inside the bypass passage 2a. Become. The front stopper 5a that has moved to the position of the bypass passage 2a is stopped at the position of the bypass passage 2a by the frictional resistance with the inner wall of the cylinder 2 without moving forward with the flow pressure of the chemical solution m.

Further, as shown in FIG. 4B, when the plunger rod 6 is pushed, the chemical solution m on the front side of the rear stopper 5b sequentially flows through the passage 2a1 of the bypass passage 2a to the front of the front stopper 5a. Then, it moves into the front chamber 2b on the front side of the bypass passage 2a. Here, the rear stopper 5b comes into contact with the rear end surface of the front stopper 5a, and the chemical solution m is completely moved into the front chamber 2b. The user sufficiently observes the chemical solution that has moved to the front chamber 2b from the outer peripheral side of the front chamber 2b of the cylinder 2, and checks whether there is an abnormality in the chemical solution m including bubbles.
In addition, when the front stopper 5a is pushed into the position of the bypass passage 2a of the cylinder 2 as described above, the chemical solution m whose front seal is released enters the front chamber 2b through the bypass passage 2a. The chemical solution m that has passed through the narrow passage 2a1 of the passage 2a flows from the front chamber 2b all at once into the through hole 3f of the luer tip 3a, but the movable valve 9 effectively reduces the flow of the chemical solution m in the through hole 3f. Therefore, the water gun phenomenon that the chemical solution m protrudes from the tip of the injection needle 7 is reliably prevented.

  Thereafter, as shown in FIG. 4 (c), the protector 8 covered with the injection needle 7 is removed from the barrel tip 3, and if there are bubbles remaining on the upper part of the drug solution m, the plunger rod 6 is appropriately operated. As a result, the bubbles are discharged through the injection needle 7 from the through hole 3f of the luer tip 3a. After the bubbles are completely removed from the cylinder 2, as shown in FIG. 4D, the plunger rod 6 is further pushed so that the front stopper 5a passes through the rear stopper 5b and the front end of the front chamber 2b (the cylinder tip 3). Injection is performed by advancing to the bottom 3e) of the proximal end 3b.

  As described above, in the syringe 1 for both containers, when the drug solution m in the rear chamber 2c of the cylinder 2 moves to the front chamber 2b of the cylinder 2 through the passage 2a1 of the bypass passage 2a of the cylinder 2, Immediately jumping into the front chamber 2b through the narrow passage 2a1 and preventing a water gun phenomenon protruding from the tip of the injection needle 7, an abnormal condition including a bubble of the drug solution m immediately before injection is made in the front chamber 2b. Presence / absence can be firmly observed from the outer peripheral side of the transparent cylinder 2, and it is possible to perform the injection with peace of mind after confirming that there is no abnormality in the drug solution m.

  As explained above, the container-use syringe 1 according to the above embodiment is made of a transparent material, and the cylinder 2 in which the bypass passage 2a formed by bulging the cylinder wall outward is formed in the intermediate portion in the axial direction; A front portion that is fitted into the rear chamber 2c of the cylinder 2 on the rear side of the bypass passage 2a with a space in the axial direction thereof, and seals the liquid medicine m filled in the rear chamber 2c in a liquid-tight manner. A stopper 5a, a rear stopper 5b, a luer tip 3a for attaching the injection needle 7 to the tip, and a tube tip 3 fitted with a base end 3b on the outer peripheral portion of the front end of the cylinder 2 through a fitting hole 3d; A finger grip 4 fitted to the outer peripheral portion of the rear end of the cylinder 2 and a plunger rod 6 inserted into the cylinder 2 from the rear end portion of the cylinder 2 and connected to the rear stopper 5b. Preparation The length L of the bypass path 2a of the cylinder 2 is set longer than the axial length L1 of the front stopper 5a, and the length L2 of the front chamber 2b of the cylinder 2 on the front side of the bypass path 2a 2 is set longer than the distance L3 between the front stopper 5a and the rear stopper 5b separated by the chemical solution in the rear chamber 2c, and is formed in the luer tip 3a of the cylinder tip 3 so as to be the front chamber of the cylinder 2. Inside the through hole 3f communicating with 2b, there is provided a movable valve 9 that allows the flow of the chemical liquid m from the cylinder 2 to the tip side of the luer tip 3a to be relaxed and passed.

  Therefore, according to the container / syringe 1 according to the above embodiment, the front side stopper 5a is pushed into the position of the bypass path 2a of the cylinder 2 so that the medicinal solution m whose front side is released from the bypass path 2a. Since the entire amount enters the front chamber 2b of the cylinder 2 on the front side of the bypass passage 2a from the rear chamber 2c of the rear cylinder 2 through the bypass passage 2a, the conventional container-combined syringe is placed in the front chamber 2b of the cylinder 2. The state of the drug solution before injection, which was difficult to see at the tip of the cylinder, can be well observed from the outside of the front chamber 2b of the transparent cylinder 2, including air bubbles, and the drug solution can be injected into the human body with peace of mind.

  In addition, the tube tip 3 fitted to the front end of the cylinder 2 is not provided with a bypass chamber having a bypass groove unlike the tube tip of the conventional syringe serving as a container. The chemical solution m moves from the rear chamber 2c through the passage 2a1 to the front chamber 2b. Therefore, when the plunger rod 6 is pushed, the chemical solution m on the front side of the rear stopper 5b flows through the passage 2a1 of the bypass passage 2a and flows into the through hole 3f of the luer tip 3a. Since the movable valve 9 effectively relaxes the flow of the chemical solution m, the water gun phenomenon in which the chemical solution m protrudes from the tip of the injection needle 7 can be reliably prevented.

  Moreover, according to the container-use injector 1 according to the above embodiment, the movable valve 9 has a circular plate 9a having a diameter smaller than the inner diameter of the through hole 3f of the luer tip 3a, and the outer peripheral portion thereof is inside the through hole 3f. The outer peripheral portion is spaced apart from the wall surface and oriented perpendicularly to the axial direction of the through-hole 3f, and the outer peripheral portion thereof is connected to the inner wall surface of the through-hole 3f by one-point support via the support piece 9b, and the one-point support portion is used as a fulcrum. Since the movable valve 9 is configured to be swingable back and forth in the through hole 3f of the luer tip 3a, it is configured to swing back and forth in the axial direction of the through hole 3f. In addition to injection, a flashback that causes blood to flow back through the through-hole 3f of the luer tip 3a can be seen without any trouble, and the structure is simple. When the tube tip 3 is molded, it can be easily integrated with the luer tip 3a. Can be manufactured.

  The movable valve 9 is formed by one thin circular plate 9a, and one part of the outer peripheral portion of the circular plate 9a is connected to the inner wall of the through hole 3f of the luer tip 3a through a support piece 9b. Although it is configured to be able to swing back and forth in the axial direction of 3f, the present invention is not limited to this, and a plurality of sector plates are formed by equally dividing the circular plate 9a in the circumferential direction by a radial dividing line passing through the center of the circular plate 9a. The arc-shaped portion of each sector plate may be individually connected to the inner wall of the through-hole 3f to the luer tip 3a by the support piece 9b, and each sector plate may swing independently back and forth. Furthermore, it is good also as a structure hold | maintained in the said through-hole 3f so that the spherical body smaller than the internal diameter of the said through-hole 3f can move back and forth in the fixed range of the axial direction of the through-hole 3f.

  In addition, in the container combined use syringe 1 which concerns on the said embodiment, although the example which applied this invention to the single chamber type container combined use syringe was shown, this invention is not limited to this but is applied also to the two chamber type container combined use syringe. can do. In this case, since the volume in the cylinder 2 on the front side of the bypass passage 2a needs to be equal to or more than the total volume of the medicines in the two chambers in the cylinder, the total length of the syringe serving as a container is somewhat longer. .

It is a longitudinal cross-sectional view which shows the container combined use syringe which concerns on one embodiment of this invention. It is the longitudinal cross-sectional view of the cylinder tip of a syringe used also as a container. FIG. 3 is a view taken in the direction of arrow A in FIG. 2. It is a longitudinal cross-sectional view which shows the effect | action of the container combined use syringe which concerns on one embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Syringe and syringe 2 Cylinder 2a Bypass path 2b Front chamber 2c Rear chamber 3 Tube tip 3a Luer tip 3b Base end 3d Insertion hole 3f Through-hole 4 Finger grip 5a, 5b Front, rear stopper 6 Plunger rod 7 Injection needle 8 Protector 9 Movable valve 9a Circular plate 9b Support piece L Length of bypass path L1 Length of front stopper (axis length)
L2 Length of front chamber L3 Distance between front and rear stoppers m Chemical solution

Claims (2)

A cylinder made of a transparent material and having a bypass passage formed by bulging the cylinder wall outward in an axially intermediate portion, and an axial space in the rear chamber of the cylinder on the rear side of the bypass passage A front stopper and a rear stopper for sealing the liquid medicine inserted and filled in the rear chamber in a liquid-tight manner, and a luer tip for attaching an injection needle to the tip are provided, and a base end is an outer periphery of the front end of the cylinder And a finger grip provided on the outer periphery of the rear end of the cylinder, and a plunger rod inserted into the cylinder from the rear end of the cylinder and connected to the rear stopper. A container combined syringe,
The length of the bypass path of the cylinder is set longer than the axial length of the front stopper, and the length of the front chamber of the cylinder on the front side of the bypass path is separated by a chemical in the rear chamber of the cylinder The distance between the front stopper and the rear stopper is set to be longer than the distance between the front stopper and the rear stopper. A syringe which is also used as a container, and is provided with a movable valve which is allowed to pass through.   The movable valve has a circular plate having a diameter smaller than the inner diameter of the through-hole at the luer tip, the outer peripheral portion of which is separated from the inner wall surface of the through-hole and directed perpendicular to the axial direction of the through-hole, and the outer peripheral portion is The single-point support is connected to an inner wall surface of the through-hole, and is configured to be swingable forward and backward in the axial direction of the through-hole with the one-point support portion as a fulcrum. Syringe for both containers.

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