KR101795445B1 - Safety filter syringe - Google Patents

Abstract

Provided is a filter syringe capable of performing injection conveniently and preventing reuse of a syringe needle. The filter syringe comprises: a cylinder in which a syringe needle is coupled at the front; a filter unit installed in the cylinder and including a first path in which an injection liquid flows into the cylinder through the syringe needle, and a second path which does not overlap with the first path and in which the injection liquid is discharged from the cylinder; and a piston in which a coupling axis member coupled with the filter unit is formed at the front, which moves forward or backward while at least part is inserted in the cylinder and which introduces the injection liquid to the inside of the cylinder or discharges the injection liquid to the outside of the cylinder.

Description

Filter Syringe {SAFETY FILTER SYRINGE}

The present invention relates to a filter syringe.

In general, a syringe is used to collect blood from a patient's blood vessel or to collect other body fluids in the body. On the other hand, it is used to inject drugs directly into the blood vessels or to inject drugs into the muscles or subcutaneously.

That is, the syringe can be used to collect body fluids in the body or to inject injections into the body.

On the other hand, in order to transfer the drug contained in the glass ampoule or the small glass bottle containing the rubber stopper into the syringe when the injection is injected into the body through the syringe, the upper part of the glass ampoule is cut and the injection needle I will inhale the drug to be injected.

The injection needle of the syringe thus used is covered with a protective cap and then discarded. At this time, a doctor or a nurse using a syringe is often stuck to the needle, and the protective cap on the needle is also separated during the disposal process of the syringe, so that the disposal operator is also stuck to the needle.

In this case, there is a second infectious problem when a syringe handler or a disposal handler is stabbed in an injection needle used for a patient having an infectious pathogen such as a patient of type B infection or AIDS.

An embodiment of the present invention provides a filter syringe which is simple in the injection process and can prevent the glass particles of the ampule from being injected into the patient while preventing the reuse of the injection needle, do.

According to an aspect of the present invention, there is provided an injection apparatus including: a cylinder in which a coupling tube is formed so that a needle is coupled; A filter unit installed in the cylinder and including a first path through which the injection liquid flows into the cylinder through the injection needle and a second path formed in the center of the first path and through which the injection liquid is discharged from the cylinder; A coupling shaft member engageable with the filter unit is formed at a front side and includes a piston that moves forward or backward in a state where at least a part of the coupling shaft member is inserted into the cylinder to inject the injection liquid into the cylinder, A check valve connected to the injection needle, the check valve closing the second path to introduce the injection solution through the first path, the check valve closing the first path and discharging the injection solution through the second path; A filter member provided on the second path for filtering the injection liquid discharged through the second path and a receiving groove formed in the receiving groove for receiving the filter member so that the filter member accommodated in the receiving groove is in close contact with the check valve Wherein a first inlet hole is formed in the rear side of the coupling tube so as to penetrate radially outwardly and a rear side thereof is communicated with the first inlet hole and forwardly recessed to receive the injection liquid A second inflow hole communicating with the inflow groove on one side and having a smaller cross sectional area from the front portion to the rear portion is formed, and when the infusion liquid is introduced, the infusion liquid pushes the check valve backward Thereby opening the second inflow hole and introducing the filter syringe into the cylinder.

At this time, the first path may be formed at the outer periphery of the second path so that the first path and the second path do not overlap.

At this time, the check valve includes a cylindrical tubular member; And a wing member extending from the front center portion of the cylindrical member and having a smaller diameter toward the front and a wing member extending outward from the rear of the cylindrical member.

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At this time, a first discharge hole may be formed in the center of the cylindrical member and the column member.

At this time, one side of the column member includes a cut-away surface formed with at least a partially incised incision, and the incision surface can selectively open and close the first exit hole when the injected solution is introduced or discharged.

At this time, the filter body includes a tubular outer tubular member and a tubular inner tubular member connected to the outer tubular member and disposed inside the outer tubular member, and a second exhaust hole is formed at the center of the inner tubular member And a receiving groove for receiving the filter member may be formed on a front surface of the inner cylinder member.

In this case, the second inflow hole is formed between the inner cylinder member and the outer cylinder member. When the injection liquid is introduced, the injection liquid pushes the wing member backward to open the front portion of the second inflow hole, Can be introduced.

At this time, at least one latching groove is formed on the outer circumferential surface of the outer cylinder member, and a fixing protrusion engageable with the latching groove may be formed on the inner circumferential surface of the cylinder.

At this time, the cross-sectional area of the first inflow hole decreases from the front to the back, thereby increasing the speed of the infusion liquid.

In this case, the piston includes a gasket coupled to the front of the piston and having an outer circumferential surface in close contact with the piston, the engagement shaft member is disposed inside the gasket, and the front portion of the engagement shaft member is disposed forward It can be mounted in a protruding manner.

At this time, the coupling shaft member is formed at the front of the coupling shaft member, and is formed at the rear of the locking projection in the coupling shaft member and projecting forwardly of the gasket to be coupled to one side of the filter member, And a fastening member protruding outwardly.

At this time, the fastening member is formed in a circular plate shape, and when the engagement shaft member moves forward, it moves forward in the gasket and can contact the rear surface of the gasket.

At this time, the hooking protrusion can be prevented from being reused because the cross-sectional area decreases from the rear to the front, and the hooking protrusion passes through the filter member after the injection solution is discharged through the second path.

The filter syringe according to an embodiment of the present invention includes a filter unit, and when injecting an injection liquid into a syringe, the filter member is passed through the injection unit without passing through a filter member, thereby facilitating the injection process. .

In addition, the filter syringe according to an embodiment of the present invention includes the coupling shaft member, and injects the injection liquid into the patient, and the coupling shaft member is fixed through the filter member, thereby preventing reuse of the filter syringe.

1 is a perspective view illustrating a filter syringe according to an embodiment of the present invention.
2 is an exploded perspective view showing a filter syringe according to an embodiment of the present invention.
3 is a cross-sectional view showing a check valve of a filter syringe according to an embodiment of the present invention.
4 is a cross-sectional view of a filter body of a filter syringe according to an embodiment of the present invention.
5 is a cross-sectional view illustrating a gasket of a filter syringe according to an embodiment of the present invention.
FIG. 6 is a perspective view showing that the coupling shaft member of the filter syringe according to the embodiment of the present invention is fixed through the filter member. FIG.
FIG. 7 is a cross-sectional view illustrating injection of an injection liquid into a filter syringe according to an embodiment of the present invention.
FIG. 8 is a cross-sectional view illustrating the injection of an injection into a filter syringe according to an embodiment of the present invention. FIG.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings, which will be readily apparent to those skilled in the art to which the present invention pertains. The present invention may be embodied in many different forms and is not limited to the embodiments described herein. In order to clearly illustrate the present invention, parts not related to the description are omitted, and the same or similar components are denoted by the same reference numerals throughout the specification.

In this specification, the terms "comprises" or "having" and the like refer to the presence of stated features, integers, steps, operations, elements, components, or combinations thereof, But do not preclude the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof. Also, where a section such as a layer, a film, an area, a plate, or the like is referred to as being "on" another section, it includes not only the case where it is "directly on" another part but also the case where there is another part in between. On the contrary, where a section such as a layer, a film, an area, a plate, etc. is referred to as being "under" another section, this includes not only the case where the section is "directly underneath"

1 is a perspective view illustrating a filter syringe according to an embodiment of the present invention. 2 is an exploded perspective view showing a filter syringe according to an embodiment of the present invention.

In the following description, the lid is defined forward in the piston and the piston is defined in the lid in the lid in FIG. 1, and the injection liquid refers to a substance in which foreign substances such as a chemical liquid and glass particles are mixed.

1 and 2, a filter syringe 1 according to an embodiment of the present invention may include a hub 30, a cylinder 10, a piston 20, and a filter unit 50. At this time, the filter syringe 1 according to the embodiment of the present invention includes the filter unit 50, and when injecting the injection liquid into the syringe, This is simple but can prevent foreign substances from being injected into the patient.

Referring to FIGS. 1 and 2, in one embodiment of the present invention, the hub 30 may include a fixing member 31 on which the injection needle 35 is mounted and a lid 33 covering the injection needle. 2, in one embodiment of the present invention, the injection needle 35 is mounted on the front portion of the fixing member 31 to allow the injection liquid to flow through the injection needle.

In the embodiment of the present invention, an injection liquid, which is combined with the coupling tube 11 of the cylinder 10 and flows in or out through the injection needle 35, To be introduced or discharged.

Referring to FIG. 2, in an embodiment of the present invention, the cylinder 10 may have a cylindrical shape in which a hollow portion is formed to store an injection liquid therein. At this time, the filter unit 50 may be installed in the front portion of the cylinder 10. In an embodiment of the present invention, a piston 20 may be installed in the cylinder 10 behind the filter unit 50.

Meanwhile, in the embodiment of the present invention, the coupling pipe 11 is formed at the front portion of the cylinder 10, so that the hub 30 can be fitted. At this time, the coupling pipe 11 is cylindrical in shape and smaller than the diameter of the cylinder 10, and can be formed protruding forward at the front center portion of the cylinder.

Also, in the embodiment of the present invention, a through hole 13 may be formed in the center of the coupling tube 11 so that the injection liquid can be introduced or discharged. A first inlet hole (15) penetrating radially outwardly may be formed on the inner circumferential surface of the rear end of the coupling pipe (11).

In an embodiment of the present invention, the first inlet hole 15 may be formed in a plurality of holes. At this time, the number of the first inlet holes 15 may be eight but is not limited thereto. The plurality of first inlet holes 15 may be spaced apart from each other in the circumferential direction of the coupling pipe 11.

Meanwhile, in an embodiment of the present invention, the first fixing groove 17 may be formed at the rear end of the coupling pipe 11 so that the check valve 51 can be closely attached thereto. At this time, in the embodiment of the present invention, the check valve 51 is brought into close contact with the first fixing groove 17 so that the injection liquid can flow into the cylinder 10 through the first inlet hole 15 of the coupling tube 11 .

In an embodiment of the present invention, an inlet groove 10a may be formed at the front side end of the cylinder 10 connected to the coupling tube 11 to be forwardly recessed to receive the injection fluid. Further, the inflow groove 10a may be in a state where the wing member 55 of the check valve 51 is covered. In this case, the first inlet hole 15 and the inlet groove 10a may be connected to allow the injection liquid to flow.

2, the filter syringe 1 according to the embodiment of the present invention is installed in the cylinder 10 so that a first path through which an injection liquid flows is formed by a filter formed so as not to overlap with a second path through which the injection liquid is discharged from the cylinder. (50). At this time, the first path may be formed on the outer circumferential portion so as not to overlap with the second path.

Accordingly, the filter syringe 1 according to the embodiment of the present invention allows the injection of the injection liquid into the cylinder 10 without passing through the filter member 59, This is simple and can prevent the glass particles of the ampule from being injected into the patient.

At this time, the first path is the through hole 13, the first inflow hole 15, the inflow groove 10a and the second inflow hole 67, the second path is the second discharge hole 65a, And may be a hole 51a and a through hole a.

More specifically, in one embodiment of the present invention, the filter portion 50 is coupled to the inner front portion of the cylinder 10 and may include a check valve 51, a filter member, and a filter body 61. At this time, the filter syringe 1 according to an embodiment of the present invention includes the filter unit 50, and can filter the foreign substances contained in the injection liquid when discharging the injection liquid.

2 and 3, in an embodiment of the present invention, the check valve 51 may selectively open and close one of the first path and the second path. At this time, the check valve 51 may be made of, for example, silicone material, which is elastically deformable for opening and closing the injection liquid. Therefore, the check valve 51 should be excellent in elasticity and not harmful to hygiene.

Meanwhile, in an embodiment of the present invention, the check valve 51 may include a cylinder member 53, a wing member 55, and a pillar member 57. Meanwhile, in the embodiment of the present invention, the cylindrical member 53 has a cylindrical shape, and the front portion of the cylindrical member can be seated and fixed in the first fixing groove 17 of the cylinder 10.

In addition, in one embodiment of the present invention, the wing member 55 may be formed in a disc shape and extend radially outward at the rear portion of the cylindrical member 53. At this time, at least the radially outer end of the wing member 55 may be formed of an elastic material.

That is, in the embodiment of the present invention, the wing member 55 elastically deforms due to the pressure of the injection liquid when the injection liquid flows into the cylinder 10, thereby selectively introducing the second inlet hole 67 of the filter body 61 Can be opened and closed.

2 and 3, in an embodiment of the present invention, the pillar member 57 can be formed to extend forwardly in the front center portion of the cylindrical member 53. [ At this time, the cross-sectional area of the column member 57 becomes smaller as it goes forward, so that the end of the column member can be contacted. 3, in one embodiment of the present invention, the cross section of the pillar member 57 may have a triangular shape, but the present invention is not limited thereto.

Meanwhile, in one embodiment of the present invention, the column member 57 may include a cut-away surface 57a formed with a cut-away portion 57b at least partially cut out on the entire surface thereof. At this time, in one embodiment of the present invention, the incision 57b may be formed in a straight or cross shape.

In the filter syringe 1 according to the embodiment of the present invention, when the injection liquid flows into the cylinder 10, the incision can be opened only when the incision 57b is closed and discharged to the outside of the cylinder.

3, in the central part of the cylindrical member 53, the column member 57 and the wing member 55 in the embodiment of the present invention, a first discharge hole 51a May be formed.

Referring to FIGS. 2 and 4, in one embodiment of the present invention, the filter body 61 may include an outer cylinder member 53 and an inner cylinder member 53. At this time, in an embodiment of the present invention, the filter body 61 is coupled to the inner circumferential surface of the cylinder 10 so that the filter member 59 can be brought into close contact with the rear surface of the check valve 51.

Referring to FIG. 4, in the embodiment of the present invention, the outer cylinder member 53 may have a cylindrical shape and a fixing groove 63a may be formed on the outer circumferential surface thereof in a circumferential direction. In this case, the fixing groove 63a of the outer cylinder member 53 may be fitted to the fixing protrusion 10b protruding from the inner circumferential surface of the cylinder 10 in one embodiment of the present invention.

Meanwhile, in an embodiment of the present invention, an inner cylinder member 53 may be formed inside the outer cylinder member 53. [ Referring to FIG. 2, in an embodiment of the present invention, the outer cylinder member 53 and the inner cylinder member 53 may be connected to each other.

In an embodiment of the present invention, a second inflow hole 67 may be formed between the outer cylinder member 53 and the inner cylinder member 53 to allow injection of the injection liquid. At this time, the wing member 55 may be installed to cover a part of the second inflow hole 67. In addition, the cross-sectional area of the second inflow hole 67 is narrowed from the front to the back so that the inflow speed of the injection liquid can be increased.

Referring to FIG. 2, in an embodiment of the present invention, the second inflow hole 67 may be formed in plurality. At this time, the number of the second inlet holes 67 may be four but is not limited thereto. In addition, the plurality of second inlet holes 67 may be spaced apart in the circumferential direction. At this time, each of the plurality of second inlet holes 67 may extend in the circumferential direction by a predetermined length.

Meanwhile, in an embodiment of the present invention, the inner cylinder member 53 may have a cylindrical shape and a receiving groove 65b may be formed to accommodate the filter member 59 on the entire surface thereof. The filter member 59 can be brought into close contact with the rear surface of the check valve 51 while being seated in the receiving groove 65b of the inner cylinder member 53. [

In an embodiment of the present invention, a second discharge hole 65a through which the injection liquid is discharged to the outside of the cylinder 10 may be formed at the center of the inner cylinder member 53. [

Referring to FIG. 2, in an embodiment of the present invention, the filter member 59 is formed to cover the second discharge hole 65a so that the injection liquid passes through the filter member when passing through the second discharge hole 65a . That is, the filter unit 50 according to the embodiment of the present invention allows the passage through the filter member 59 only when the injection liquid is discharged out of the cylinder 10.

In an embodiment of the present invention, the filter member 59 may be made of various materials irrespective of the type, so long as the filter member 59 has a density capable of filtering the foreign substances contained in the injection liquid through which the second discharge hole 65a passes.

2, in one embodiment of the present invention, the piston 20 may include a piston body 21 and a gasket 26. At this time, in one embodiment of the present invention, the piston body 21 may include an engagement shaft member 22 protruding forwardly so that the gasket 26 can be coupled to the front portion.

In this case, in an embodiment of the present invention, the coupling shaft member 22 may include a locking projection 23 and a fastening member 25. At this time, the coupling shaft member 22 may be formed such that the end of the coupling shaft member passes through the filter member 59 to prevent reuse of the injection needle.

Referring to FIG. 2, the coupling shaft member 22 is formed in the center of the piston body 21 in a cylindrical shape, and can be engaged with the gasket 26. At this time, the diameter of the coupling shaft member 22 is formed so as to become smaller from the rear to the front, so that the front portion of the coupling shaft member passes through the filter member 59.

Meanwhile, in an embodiment of the present invention, the engagement shaft member 22 may be provided with a locking protrusion 23 at the front end thereof. At this time, the locking protrusion 23 may be formed to be inserted into the coupling hole 26a of the gasket 26. [ In addition, in the embodiment of the present invention, the rear end surface of the locking protrusion 23 may be held in contact with the front end surface of the gasket while being inserted into the coupling hole 26a of the gasket 26. [

In this case, referring to FIG. 5, in the embodiment of the present invention, the locking protrusion 23 can be formed to easily pass through the filter member 59 by decreasing the diameter from front to back.

2 and 5, in an embodiment of the present invention, the fastening member 25 is formed in a cylindrical shape at the rear end of the coupling shaft member 22, that is, between the piston body 21 and the locking projection 23 . At this time, in one embodiment of the present invention, the diameter of the fastening member 25 may be reduced from the front to the rear.

2 and 6, in an embodiment of the present invention, the gasket 26 may be made of rubber or flexible synthetic resin which is inserted into the cylinder 10 so as to be movable up and down and has excellent sealing property. At this time, the gasket (26) is closely fitted to the inner peripheral surface of the cylinder (10) and moves.

Meanwhile, in one embodiment of the present invention, the gasket 26 is formed in a cylindrical shape and a wrinkle portion (not shown) may be formed on the outer circumferential surface of the gasket in the inward direction. At this time, the corrugated portion may be formed in an accordion shape. At this time, the piston body 21 according to an embodiment of the present invention is fitted tightly inside the cylinder 10 through the corrugations of the gasket 26, so that the injection liquid can be prevented from leaking.

6, in an embodiment of the present invention, a coupling hole 26a may be formed at the center of the gasket 26 so that the coupling shaft member 22 of the piston 20 can be inserted and coupled. At this time, when the coupling shaft member 22 is inserted into the coupling hole 26a of the gasket 26, it can be supported on the entire surface of the gasket in contact with the front end surface of the locking projection 23.

The length L1 of the engaging hole 26a is equal to the distance L2 between the rear end of the engaging projection 23 and the front end of the engaging member 25, (22) may be arranged to penetrate.

Referring to FIG. 6, a second fixing groove 27 may be formed at the rear end of the coupling hole 26a to fix the coupling member 25 in the embodiment of the present invention. At this time, a coupling hole 26a is formed in the center of the second fixing groove 27, and a second supporting protrusion 29 (FIG. 29) protruding inward is formed at the end of the coupling hole 26a with the diameter of the second fixing groove being larger than the diameter of the coupling hole. May be formed.

Referring to FIGS. 7 and 8, the operation of injecting or discharging the injection liquid through the filter syringe 1 according to the embodiment of the present invention will be described below.

Referring to FIG. 7, the filter syringe 1 according to an embodiment of the present invention may be introduced into the cylinder 10 by advancing the piston 20 backward when the injection liquid is introduced. At this time, the injection liquid flows through the through hole 13 of the coupling pipe 11, the first inlet hole 15 of the coupling pipe, the inlet groove 10a of the cylinder 10 and the second inlet of the filter body 61, Can be introduced into the cylinder through the hole (67).

8, the filter syringe 1 according to the embodiment of the present invention can advance the piston 20 forward when the injection liquid is discharged, so that the injection liquid can be discharged to the outside of the cylinder 10. At this time, the injection liquid flows through the second discharge hole 65a of the filter body 61, the filter member 59, the first discharge hole 51a of the check valve 51, and the through hole 13, .

Therefore, the filter syringe 1 according to the embodiment of the present invention allows the injection of the injection liquid into the syringe without passing through the filter member 59, and when the injection liquid is injected into the patient, it passes through the filter member, It can be prevented from being injected into the patient.

5, the filter syringe 1 according to the embodiment of the present invention pushes the piston 20 forward after injecting the injection liquid into the patient, and then pushes the locking projection 23 of the coupling shaft member 22 forward, Can be fixed through the filter member (59), thereby preventing reuse of the filter syringe injected into the patient.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

1: syringe 10: cylinder
10a: Inflow groove 10b: Fixing projection
11: Coupling tube 13: Through hole
15: first inlet hole 17: first fixing groove
19: first support jaw 20: piston
21: piston body 22: engagement shaft member
23: locking projection 25: fastening member
26: Gasket 26a: Coupling hole
27: second fixing groove 29: second supporting chin
30: hub 31: fixing member
33: lid 35: needle
37: o-ring 50: filter part
51: Check valve 51a: First discharge hole
53: cylinder member 55: wing member
57: column member 57a: incision surface
57b: Section improvement 59: Filter element
61: filter body 63: outer cylinder member
63a: Fixing groove 65: Inner barrel
65a: second discharge hole 65b: receiving groove
67: second inlet hole

Claims (14)

A cylinder in which a coupling tube is formed so that the injection needle is coupled;
A filter unit installed in the cylinder and including a first path through which the injection liquid flows into the cylinder through the injection needle and a second path formed in the center of the first path and through which the injection liquid is discharged from the cylinder;
A coupling shaft member engageable with the filter unit is formed at a front side and includes a piston that moves forward or backward in a state where at least a part of the coupling shaft member is inserted into the cylinder to inject the injection liquid into the cylinder, and,
The filter unit
A check valve connected to the injection needle, the check valve closing the second path to introduce the injection liquid through the first path, the check valve closing the first path and discharging the injection solution through the second path;
A filter member installed on the second path and filtering the injected solution discharged through the second path,
And a filter body formed at one side of the receiving groove to receive the filter member and closely contact the filter member accommodated in the receiving groove to the check valve,
A first inflow hole penetrating radially outward is formed in the rear side of the coupling tube and an inflow groove communicating with the first inflow hole and being recessed forward to form an inflow groove for introducing the infusion fluid is formed at one side of the rear side,
The filter body is formed with a second inflow hole communicating with the inflow groove at one side and smaller in cross-sectional area from the front portion to the rear portion. When the infusion liquid is injected, the injection liquid pushes the check valve backward, And the filter syringe is introduced into the cylinder. The method according to claim 1,
Wherein the first path is formed at the outer periphery of the second path so that the first path and the second path do not overlap. delete The method according to claim 1,
The check valve
A tubular member;
A columnar member extending from a front central portion of the cylindrical member and having a smaller diameter toward the front;
And a wing member extending outwardly from the rear of the cylindrical member. 5. The method of claim 4,
And a first discharge hole is formed at the center of the cylindrical member and the column member. 6. The method of claim 5,
And a cut-away surface formed at one side of the column member, the cut-away surface being cut at least partially,
Wherein the incision surface selectively opens and closes the first discharge hole when the injection liquid is introduced or discharged. 5. The method of claim 4,
The filter body
A tubular outer cylinder member and
And a tubular inner cylinder member connected to the outer cylinder member and disposed inside the outer cylinder member,
A second discharge hole is formed in a center portion of the inner cylinder member, and the receiving groove is formed in a front surface of the inner cylinder member. 8. The method of claim 7,
The second inflow hole is formed between the inner cylinder member and the outer cylinder member,
Wherein the injection fluid is introduced into the cylinder by opening the front portion of the second inflow hole by pushing the wing member backward when the injection fluid is introduced. 8. The method of claim 7,
At least one engagement groove is formed in the outer peripheral surface of the outer cylinder member,
And a fixing protrusion capable of engaging with the latching groove is formed on an inner circumferential surface of the cylinder. 9. The method of claim 8,
Wherein the cross-sectional area of the first inflow hole decreases from the front to the back, thereby increasing the speed of the infusion liquid. The method according to claim 1,
The piston
And a gasket coupled to the front of the piston and having an outer circumferential surface in close contact with the inside of the cylinder,
Wherein the coupling shaft member is disposed inside the gasket and the front portion of the coupling shaft member is mounted so as to protrude forward of the gasket. 12. The method of claim 11,
The coupling shaft member
A locking protrusion formed on the front of the coupling shaft member and protruding forward of the gasket to be coupled to one side of the filter member;
And a coupling member formed on the coupling shaft member behind the locking projection and protruding radially outward. 13. The method of claim 12,
Wherein the fastening member is formed in a disc shape and moves forward in the gasket when the engagement shaft member is moved forward to abut the rear surface of the gasket. 14. The method of claim 13,
Wherein the engaging protrusion is reduced in cross sectional area from the rear to the front, and the engaging protrusion is fixed through the filter member after the injection liquid is discharged through the second path, thereby preventing reuse.

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