CN110384842B

CN110384842B - Filter injector

Info

Publication number: CN110384842B
Application number: CN201811020751.4A
Authority: CN
Inventors: 金桢旭; 柳在原; 石元铉
Original assignee: Sang A Frontec Co Ltd
Current assignee: Sang A Frontec Co Ltd
Priority date: 2018-04-23
Filing date: 2018-09-03
Publication date: 2021-10-22
Anticipated expiration: 2038-09-03
Also published as: KR101891787B1; CN110384842A; WO2019208891A1

Abstract

The filter injector according to the present invention comprises: a cylinder formed with a coupling tube to be coupled with an injection needle; a filter part disposed inside the cylinder and including a first path that allows the injection liquid to flow into the inside of the cylinder through the injection needle and a second path that is formed at a central portion of the first path and allows the injection liquid to be discharged from the cylinder to the outside; and a piston having a coupling shaft member formed at a front thereof and capable of being coupled to the filter unit, wherein the piston moves forward or backward in a state in which at least a portion of the piston is inserted into the syringe, so that the injection solution flows into the syringe or is discharged to an outside of the syringe, and the filter unit includes.

Description

Filter injector

Technical Field

The present invention relates to a filter syringe.

Background

Generally, syringes are used to collect blood from a blood vessel of a patient or to collect body fluid other than blood in the body. On the other hand, the syringe is used for injecting a drug directly into a blood vessel or injecting a drug into muscle or subcutaneous tissue or the like.

That is, the syringe may be used to collect body fluid in the body or inject injection fluid into the body.

On the other hand, when an injection liquid is injected into the body through a syringe, in order to move a medicine contained in a glass ampoule or a vial with a rubber stopper into the syringe, the upper end of the glass ampoule is cut, and an injection needle is inserted through the cut portion, thereby sucking the medicine to be injected.

The injection needle of the syringe thus used is covered with a protective cap and then discarded. In this case, a doctor or a nurse using the syringe may be pricked by the needle, and the disposal person may be pricked by the needle in the disposal process of the syringe because the protective cap covering the needle is separated.

In this case, when a syringe handler or a discard handler is used for a needle stick injury of a patient having an infectious pathogen such as a type B infected patient or an aids patient, there is a problem of secondary infection.

Also, when a medicine is inhaled in an ampoule or the like, foreign matter such as glass particles may enter the inside of the syringe and then be injected into a human body.

(Prior art document)

(patent document)

(patent document 1) Korean laid-open patent application No. 10-2018-0028811

Disclosure of Invention

Technical problem

In order to solve the above-mentioned problems, an object of the present invention is to provide a filter syringe that allows an injection solution to pass through a filter member when the injection solution is injected into a human body, simplifies an injection process, and prevents glass particles of an ampoule from being injected into a patient in advance.

Means for solving the problems

In order to achieve the above object, the filter syringe of the present invention may include: a cylinder formed with a coupling tube to be coupled with an injection needle; a filter part disposed inside the cylinder and including a first path that allows the injection liquid to flow into the inside of the cylinder through the injection needle and a second path that is formed at a central portion of the first path and allows the injection liquid to be discharged from the cylinder to the outside; and a piston having a coupling shaft member formed in front thereof and coupled to the filter unit, wherein the piston is moved forward or backward in a state in which at least a portion of the piston is inserted into the syringe, such that the injection solution flows into the syringe or is discharged to the outside of the syringe, and the filter unit may include: a check valve connected to the syringe needle to allow the injection liquid to flow in through the first path and to discharge the injection liquid through the second path by means of the stopper; a filter member disposed on the second path to filter the injection liquid discharged through the second path; and a filter body having a receiving groove formed at one side thereof for receiving the filter member such that the filter member received in the receiving groove is in close contact with the check valve, and having a plurality of inflow grooves formed at a rear inner side of the coupling pipe in a radially outer direction, and having an annular groove formed at a rear end portion of the coupling pipe, the annular groove communicating with ends of the inflow grooves and being recessed forward for inflow of the injection solution, and having a plurality of cut grooves formed by cutting a portion of an outer edge of the outer side, the cut grooves communicating with the annular groove, and the injection solution being pushed backward to open the cut grooves to flow into the syringe when the injection solution flows, wherein the check valve may include: a cylindrical member having a cylindrical shape; a pillar member extending from a front center portion of the tube member, the pillar member having a diameter that decreases toward the front; and a wing member extending outward from the rear of the cylinder member, and the filter main body may include: an outer cylinder member having a cylindrical shape; and an inner cylinder member connected to the outer cylinder member and disposed inside the outer cylinder member, wherein a second discharge hole may be formed at a central portion of the inner cylinder member, the receiving groove may be formed at a front surface of the inner cylinder member, and the plurality of cut grooves may be formed at an outer peripheral edge of the outer cylinder member, and when the injection fluid flows, the injection fluid may be opened by pushing the wing members of the annular groove of the plunger backward, and then may flow into the inside of the plunger through a space between the cut grooves and an inner wall of the plunger.

At this time, a first discharge hole may be formed at the central portions of the barrel member and the pillar member.

In this case, one side of the column member may include a cut surface having a cut line formed by cutting at least a portion thereof, and the cut surface may selectively open and close the first discharge hole when the injection solution is introduced or discharged.

At this time, the outer circumferential surface of the outer cylinder member may be formed with at least one latching groove, and the inner circumferential surface of the cylinder may be formed with a fixing protrusion that can be coupled to the latching groove.

In this case, the piston may include a washer coupled to a front side of the piston and having an outer circumferential surface closely contacting an inside of the cylinder, and the coupling shaft member may be disposed inside the washer and mounted such that a front portion of the coupling shaft member protrudes forward of the washer.

At this time, the coupling shaft member may include: a locking protrusion formed in front of the coupling shaft member, protruding in front of the gasket, and coupled to one side of the filter member; and a fastening member formed behind the locking protrusion and protruding outward in the radial direction.

In this case, the fastening member may have a disk shape, and when the coupling shaft member moves forward, the fastening member moves forward inside the washer to contact the rear surface of the washer.

In this case, the cross-sectional area of the locking projection may decrease from the rear toward the front, and the locking projection may penetrate through the filter member to be fixed after the injection liquid is discharged through the second path, thereby preventing reuse.

ADVANTAGEOUS EFFECTS OF INVENTION

The present invention as described above has the following effects.

(1) The present invention includes a filter part so that the injection liquid does not pass through the filter when the injection liquid is injected into the inside of the syringe, and on the contrary, so that the injection liquid passes through the filter to filter the foreign substances when the injection liquid is injected into the patient, thereby simplifying the injection process and preventing the foreign substances from being injected into the patient in advance.

(2) The present invention includes a coupling shaft member so that the coupling shaft member penetrates through the filter part to be fixed after injection of the injection liquid into the patient, so that reuse of the filter syringe can be prevented.

Drawings

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

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

Fig. 3 is a perspective view and a sectional view illustrating a check valve of a filter syringe according to an embodiment of the present invention.

Fig. 4 is a perspective view and a sectional view illustrating a filter body of a filter syringe according to an embodiment of the present invention.

Fig. 5 is a sectional view illustrating a gasket of a filter syringe according to an embodiment of the present invention.

Fig. 6 is a perspective view illustrating that a coupling shaft member of a filter syringe according to an embodiment of the present invention is fixed through a filter part.

Fig. 7 is a sectional view illustrating a state in which an injection liquid flows into a filter syringe according to an embodiment of the present invention.

Fig. 8 is a sectional view illustrating a state in which injection liquid is discharged from a filter syringe according to an embodiment of the present invention.

Fig. 9 is a half-sectional perspective view showing a syringe of a filter syringe according to an embodiment of the present invention cut in half.

Description of the symbols

1: the injector 10: needle cylinder

10 a: annular groove 10 b: fixing groove

11: the bonding tube 13: through hole

15: the inflow groove 17: first fixing groove

19: first supporting convex portion 20: piston

21: the piston main body 22: connecting shaft component

23: locking protrusion 25: fastening member

26: gasket 26 a: combining hole

27: second fixing groove 29: second supporting convex part

30: interface 31: fixing member

33: cover 35: injection needle

50: the filter unit 51: check valve

51 a: first discharge hole 53: barrel component

55: the wing member 57: column component

57 a: cut surface 57 b: incision line

59: the filter member 61: filter body

63: outer cylinder member 63 a: fixing groove

65: inner tube member 65 a: second discharge hole

65 b: the accommodation grooves 67: cutting slot

Detailed Description

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that the invention can be easily implemented by those skilled in the art. It should be noted, however, that the present invention is not limited to these embodiments, but may be embodied in various other forms. For simplicity of explanation, in the drawings, parts irrelevant to the description are omitted, and like reference numerals denote like parts throughout the entire text.

In the present specification, the terms "including" or "having" or the like mean that there are the features, numerals, steps, actions, constituent elements, components, or combinations thereof described in the specification, and it is understood that the possibility of existence or addition of one or more other features, numerals, steps, actions, constituent elements, components, or combinations thereof is not excluded in advance. Also, if a layer, a film, a region, a plate, or the like is described as being over other portions, it includes not only a case directly over the other portions but also a case with the other portions in between. On the contrary, if a layer, a film, a region, a plate, or the like is described as being under other portions, it includes not only the case directly under the other portions but also the case with the other portions in between.

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

In the following description, as seen in fig. 1, the side of the piston facing the cap is defined as the front side, and the side of the cap facing the piston is defined as the rear side, and the injection solution is a mixture of a drug solution and foreign matter such as glass particles.

Referring to fig. 1 and 2, a filter syringe 1 according to an embodiment of the present invention may include a mouthpiece 30, a cylinder 10, a piston 20, and a filter part 50. At this time, the filter syringe 1 according to an embodiment of the present invention includes the filter part 50 such that the injection liquid does not pass through the filter member 59 when the injection liquid is injected into the interior of the syringe, and on the contrary, the injection liquid passes through the filter member 59 when the injection liquid is injected into the patient, so that the injection process is simple and foreign materials can be prevented from being injected into the patient in advance.

Referring to fig. 1 and 2, in one embodiment of the present invention, the hub 30 may include a fixing member 31 to which an injection needle 35 is mounted and a cover 33 for covering the injection needle. As shown in fig. 2, in one embodiment of the present invention, an injection needle 35 is installed at a front portion of the fixing member 31 such that injection liquid can flow through the injection needle.

Also, in an embodiment of the present invention, the rear portion of the fixing member 31 is coupled to the coupling tube 11 of the cylinder 10, so that the injection liquid flowed in or discharged through the injection needle 35 flows into the inside of the cylinder 10 or is discharged from the inside of the cylinder 10.

Referring to fig. 2, in an embodiment of the present invention, the cylinder 10 may have a cylindrical shape having a hollow portion so as to store the injection liquid therein. In this case, the filter unit 50 may be provided inside the front portion of the cylinder 10. Also, in an embodiment of the present invention, the piston 20 may be disposed rearward of the filter part 50 in the interior of the cylinder 10.

On the other hand, in one embodiment of the present invention, a coupling tube 11 is formed at a front portion of the cylinder 10 so as to be insertedly coupled with the hub 30. In this case, the coupling tube 11 may be formed in a cylindrical shape having a diameter smaller than that of the cylinder 10 and may be formed to protrude forward at a front center portion of the cylinder.

Also, in an embodiment of the present invention, a through hole 13 for inflow or discharge of the injection liquid may be formed at a central portion of the coupling tube 11. An inflow groove 15 may be formed in the inner circumferential surface of the rear end of the coupling pipe 11 to extend radially outward.

In an embodiment of the present invention, the inflow groove 15 may be formed in plurality. At this time, the plurality of inflow grooves 15 may be eight, but the present invention is not limited thereto. Also, the plurality of inflow grooves 15 may be arranged at intervals in a circumferential direction of the coupling pipe 11.

On the other hand, in an embodiment of the present invention, the rear side end portion of the coupling pipe 11 may be formed with the first fixing groove 17 to form a step so as to be closely attached to the check valve 51. At this time, in an embodiment of the present invention, the check valve 51 may be closely attached to the first fixing groove 17, so that the injection liquid flows in through the inflow groove 15 of the coupling tube 11 of the cylinder 10.

In an embodiment of the present invention, the front side end of the cylinder 10 connected to the coupling tube 11 may be formed with an annular groove 10a, and the annular groove 10a is recessed forward to allow the injection liquid to flow therein. The annular groove 10a may be covered with the wing member 55 of the check valve 51. At this time, in an embodiment of the present invention, the inflow groove 15 and the annular groove 10a may be connected such that the injection liquid flows therein. At this time, the outer ends of the inflow grooves 15 are all communicated with the annular groove 10b, so that the injection liquid flowing into the inflow grooves 15 is collected in the annular groove 10b and then flows into the inside of the cylinder 10 through the check valve 51.

Referring to fig. 2, the filter syringe 1 according to an embodiment of the present invention may include a filter part 50, the filter part 50 being disposed inside the cylinder 10 such that a first path through which the injection liquid flows in and a second path through which the injection liquid is discharged from the cylinder do not overlap. At this time, the first path may be formed at the outer peripheral portion so as not to overlap with the second path.

Thus, the filter syringe 1 according to an embodiment of the present invention can make the injection liquid not pass through the filter member 59 when the injection liquid is injected into the inside of the cylinder 10, and conversely, make the injection liquid pass through the filter member 59 when the injection liquid is injected into the patient, so that the injection process is simple and the glass particles of the ampoule can be prevented from being injected into the patient.

At this time, the first path may include the through hole 13, the inflow groove 15, the annular groove 10a, and the cutting groove 67, and the second path may include the second discharge hole 65a, the first discharge hole 51a, and the through hole 13.

More specifically, in an embodiment of the present invention, the filter part 50 is coupled to the front part of the inside of the cylinder 10, and may include a check valve 51, a filter member 59, and a filter body 61. At this time, the filter syringe 1 according to an embodiment of the present invention includes the filter part 50 so that foreign substances contained in the injection liquid can be filtered when the injection liquid is discharged.

Referring to fig. 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 an elastically deformable material, for example, a silicone material, for opening and closing of the injection solution. Therefore, the check valve 51 needs to have good elasticity and be harmless to the sanitation.

On the other hand, in an embodiment of the present invention, the check valve 51 may include a barrel member 53, a wing member 55, and a post member 57. On the other hand, in an embodiment of the present invention, the barrel member 53 has a cylindrical shape, and the front portion of the barrel member may be mounted and fixed to the first fixing groove 17 of the cylinder 10.

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 tubular member 53. At this time, at least the radially outer end portion of the wing member 55 may be formed of an elastic material.

That is, in one embodiment of the present invention, when the injection liquid is introduced into the cylinder 10, the wing member 55 is elastically deformed by the pressure of the injection liquid, so that the cut groove 67 of the filter body 61 can be selectively opened and closed.

Referring to fig. 2 and 3, in an embodiment of the present invention, a pillar member 57 may be formed to extend forward at a front center portion of the tube member 53. At this time, the sectional area of the pillar member 57 may be smaller toward the front so that the end portions of the pillar member may be in contact. Also, referring to fig. 3, in an embodiment of the present invention, the cross-section of the pillar member 57 may be in a triangular shape, but the present invention is not limited thereto.

On the other hand, in an embodiment of the present invention, the front surface of the pillar member 57 may include a cut surface 57a, and the cut surface 57a is formed with a cut line 57b in which at least a portion is cut. In this case, in an embodiment of the present invention, the cut line 57b may have a straight shape or a cross shape.

In the filter syringe 1 according to an embodiment of the present invention, the cut line 57b may be closed when the injection liquid is introduced into the inside of the cylinder 10, and may be opened only when the injection liquid is discharged to the outside of the cylinder.

Referring to fig. 3, in an embodiment of the present invention, a first discharge hole 51a may be formed on a second path through which the injection liquid is discharged in the center portions of the tube member 53, the pillar member 57, and the wing member 55.

Referring to fig. 2 and 4, in an embodiment of the present invention, the filter body 61 may include an outer cylindrical member 63 and an inner cylindrical member 65. At this time, in an embodiment of the present invention, the filter body 61 is combined with the inner circumferential surface of the cylinder 10 such that the filter member 59 is closely attached to the rear surface of the check valve 51.

Referring to fig. 4, in one embodiment of the present invention, the outer cylindrical member 63 has a cylindrical shape, and the fixing protrusion 63a is formed to extend in a circumferential direction on an outer circumferential surface of the outer cylindrical member 63. At this time, in an embodiment of the present invention, the fixing protrusion 63a of the outer cylinder member 63 may be insert-coupled to the fixing groove 10b formed at the inner circumferential surface of the cylinder 10.

On the other hand, in an embodiment of the present invention, an inner cylinder member 65 may be formed inside the outer cylinder member 63. At this time, referring to fig. 2, in an embodiment of the present invention, the outer cylinder member 63 and the inner cylinder member 65 may be connected to each other and integrally formed.

In an embodiment of the present invention, a cutting groove 67 into which the injection liquid flows may be formed at an outer side of the outer cylinder member 63. At this time, the wing member 55 may be disposed in such a manner as to cover the cut groove 67. Accordingly, the injection liquid can flow between the cut groove 67 and the inner sidewall of the cylinder 10.

Referring to fig. 2, in an embodiment of the present invention, the cutting groove 67 may be formed in plurality. At this time, the cutting grooves 67 may be formed in four, but the present invention is not limited thereto. Also, a plurality of the cutting grooves 67 may be arranged at intervals in the circumferential direction. At this time, the plurality of cutting grooves 67 may be extended in the circumferential direction by a predetermined length, respectively.

Referring to fig. 4, the filter bodies 61 may be connected to each other by a cross-shaped extension such that the outer cylinder member 63 and the inner cylinder member 65 are integrally formed. This shape makes injection molding of synthetic resin very easy. Also, by forming a passage for the injection liquid to flow in using the cut groove 67 and the inner wall of the cylinder 10, it is possible to design so that the rigidity is higher than that in the case where a plurality of holes are formed in the filter body 61.

On the other hand, in an embodiment of the present invention, a receiving groove 65b having a cylindrical shape may be formed at an inner side of the outer cylinder member 63 so that the filter element 59 may be received at a front side. The filter member 59 can be closely attached to the rear surface of the check valve 51 in a state of being mounted in the housing groove 65 b.

Also, in an embodiment of the present invention, a second discharge hole 65a may be formed at a central portion of the inner cylinder member 65, the second discharge hole 65a allowing the injection liquid to be discharged to the outside of the cylinder 10.

Referring to fig. 2, in one embodiment of the present invention, the filter member 59 is disposed in such a manner as to cover the second discharge hole 65a, so that the injection liquid may also pass through the filter member 59 while passing through the second discharge hole 65 a. That is, the filter unit 50 according to an embodiment of the present invention allows the injection liquid to pass through the filter member 59 only when discharged to the outside of the cylinder 10.

In one embodiment of the present invention, as the material of the filter member 59, various materials may be used regardless of the type thereof as long as they have a density capable of filtering the foreign substances contained in the injection liquid passing through the second discharge hole 65 a.

As a result, referring to fig. 6 to 9, the filter body 61 is formed with a plurality of cut grooves 67, the plurality of cut grooves 67 are formed by cutting a part of the outer edge of the outer tube member 63 and communicate with the annular groove 10a, and when the injection liquid flows, the injection liquid opens the plurality of cut grooves 67 by pushing the wing member 55 of the check valve 51 rearward, so as to flow into the inside of the cylinder 10.

Referring to fig. 2, in an embodiment of the present invention, the piston 20 may include a piston body 21 and a gasket 26. At this time, in an embodiment of the present invention, the front portion of the piston main body 21 may include a coupling shaft member 22, and the coupling shaft member 22 is formed to protrude forward so as to be coupled with the washer 26.

At this time, in an embodiment of the present invention, the coupling shaft member 22 may include the locking protrusion 23. At this time, an end portion of the coupling shaft member 22 may be formed to penetrate the filter member 59 in order to prevent reuse of the injection needle.

Referring to fig. 2, the coupling shaft member 22 has a cylindrical shape and is formed at a central portion of the piston main body 21 to be insertedly coupled to the washer 26. At this time, the diameter of the coupling shaft member 22 decreases from the rear to the front, so that the front portion of the coupling shaft member can penetrate the filter member 59.

On the other hand, in an embodiment of the present invention, the engagement projection 23 may be formed at the front end portion of the coupling shaft member 22. At this time, the locking projection 23 can be inserted into the coupling hole 26a of the washer 26. In one embodiment of the present invention, the rear end surface of the locking projection 23 may be supported in contact with the front end surface of the washer in a state inserted into the coupling hole 26a of the washer 26.

At this time, referring to fig. 5, in one embodiment of the present invention, the diameter of the locking projection 23 is reduced from the front to the rear so as to easily penetrate the filter member 59.

Referring to fig. 2 and 5, a fastening member may be further included in an embodiment of the present invention. The fastening member is formed in a disc shape at a rear end portion of the coupling shaft member 22, that is, between the piston main body 21 and the locking projection 23. At this time, in an embodiment of the present invention, the diameter of the fastening member may be smaller from the front toward the rear.

Referring to fig. 2 and 6, in an embodiment of the present invention, the gasket 26 is inserted into the inside of the cylinder 10 to be movable up and down and is made of rubber or flexible synthetic resin having good sealability. At this time, the washer 26 moves while being closely inserted into the inner circumferential surface of the cylinder 10.

On the other hand, in an embodiment of the present invention, the gasket 26 may have a cylindrical shape, and a corrugated portion (not shown) may be formed on an outer circumferential surface of the gasket in an inward direction. In this case, the wrinkle portion may have an accordion shape. At this time, the piston body 21 according to an embodiment of the present invention is closely inserted into the syringe 10 through the wrinkle portion of the gasket 26, thereby preventing the injection liquid from leaking.

Referring to fig. 5, in an embodiment of the present invention, a central portion of the washer 26 may be formed with a coupling hole 26a for insertion coupling of the coupling shaft member 22 of the piston 20. At this time, when the coupling shaft member 22 is inserted into the coupling hole 26a of the washer 26, the front surface of the washer can be coupled to and supported by the front end surface of the locking projection 23.

In an embodiment of the present invention, the length of the coupling hole 26a is the same as the distance between the rear end portion of the locking protrusion 23 and the front end portion of the fastening member so that the coupling shaft member 22 can be disposed through the coupling hole.

Referring to fig. 6, in an embodiment of the present invention, a second fixing groove 27 may be formed at a rear end portion of the coupling hole 26a to fix the fastening member. At this time, a coupling hole 26a may be formed at a central portion of the second fixing groove 27, and a second supporting protrusion 29 protruding in an inner direction may be formed at an end portion of the coupling hole 26a since a diameter of the second fixing groove is greater than that of the coupling hole.

An operation of allowing the injection liquid to flow in or be discharged through the filter syringe 1 according to an embodiment of the present invention will be described with reference to fig. 7 and 8.

Referring to fig. 6, the filter syringe 1 according to an embodiment of the present invention allows the injection liquid to flow into the inside of the cylinder 10 by advancing the piston 20 in a rearward direction when the injection liquid flows. At this time, the injection liquid can flow into the syringe through the through hole 13 of the coupling tube 11, the inflow groove 15 of the coupling tube, the annular groove 10a of the syringe 10, and the cut groove 67 of the filter body 61, which are the first path.

On the other hand, referring to fig. 7, when the injection liquid is discharged, the filter syringe 1 according to an embodiment of the present invention discharges the injection liquid to the outside of the cylinder 10 by advancing the piston 20 forward. At this time, the injection liquid can be discharged to the outside of the cylinder 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, which are the second path.

Therefore, in the filter syringe 1 according to an embodiment of the present invention, when the injection liquid is injected into the interior of the syringe, the injection liquid is not passed through the filter member 59, and on the contrary, when the injection liquid is injected into the patient, the injection liquid is passed through the filter member 59, so that the injection process is simple and foreign substances can be prevented from being injected into the patient.

On the other hand, referring to fig. 8, after the injection liquid is injected into the patient, the filter syringe 1 according to the embodiment of the present invention may prevent reuse of the filter syringe injecting the injection liquid into the patient by pushing the piston 20 forward to pass the locking protrusion 23 of the coupling shaft member 22 through the filter member 59 to be fixed.

While one embodiment of the present invention has been described above, the gist of the present invention is not limited to the embodiment of the present invention, and those skilled in the art can easily propose other embodiments by adding, modifying, deleting, adding, etc. components within the same gist of the present invention, and these embodiments fall within the gist of the present invention.

Claims

1. A filter injector, comprising:

a cylinder formed with a coupling tube to be coupled with an injection needle;

a filter part disposed inside the cylinder and including a first path that allows the injection liquid to flow into the inside of the cylinder through the injection needle and a second path that is formed at a central portion of the first path and allows the injection liquid to be discharged from the cylinder to the outside; and

a piston having a coupling shaft member formed at a front thereof and capable of being coupled to the filter unit, the piston being moved forward or backward in a state where at least a portion of the piston is inserted into the cylinder such that the injection solution flows into the cylinder or is discharged to an outside of the cylinder,

the filter portion includes:

a check valve connected to the syringe needle to allow the injection liquid to flow in through the first path and to discharge the injection liquid through the second path by means of the stopper;

a filter member disposed on the second path to filter the injection liquid discharged through the second path; and

a filter main body having a receiving groove formed at one side thereof for receiving the filter member such that the filter member received in the receiving groove is closely attached to the check valve,

a plurality of inflow grooves are formed in the coupling tube at the rear inner side thereof toward the radial outer side thereof, an annular groove is formed at the rear distal end portion of the coupling tube, the annular groove communicating with the distal ends of the inflow grooves and being recessed forward to allow the injection solution to flow therein,

the filter body is formed with a plurality of cutting grooves formed by cutting a part of the outer edge of the filter body, the plurality of cutting grooves are communicated with the annular groove, when the injection liquid flows, the injection liquid pushes the check valve backwards to open the plurality of cutting grooves so as to flow into the syringe,

the check valve includes:

a cylindrical member having a cylindrical shape;

a pillar member extending from a front center portion of the tube member, the pillar member having a diameter that decreases toward the front; and

a wing member formed to extend outward from the rear of the tube member,

the filter body includes:

an outer cylinder member having a cylindrical shape; and

an inner cylindrical member connected with the outer cylindrical member, disposed inside the outer cylindrical member,

the center portion of the inner cylinder member is formed with a second discharge hole, and the front face of the inner cylinder member is formed with the receiving groove,

the outer periphery of the outer cylinder member is formed with the plurality of cut grooves, and when the injection solution flows, the injection solution pushes the wing members of the annular groove of the plunger backward to open the plurality of cut grooves, and then flows into the inside of the syringe through a space between the cut grooves and the inner wall of the syringe,

the plurality of cutting grooves are formed on the outer side surface of the filter main body to ensure a space for sufficiently bending the wing member, thereby ensuring the inflow path of the injection liquid and enabling the injection liquid to smoothly flow in during injection.

2. Filter syringe according to claim 1,

a first discharge hole is formed at a central portion of the barrel member and the pillar member.

3. Filter syringe according to claim 2,

one side of the column member includes a cutting surface having a cutting line formed by cutting at least a portion thereof, and the cutting surface selectively opens and closes the first discharge hole when the injection solution is introduced or discharged.

4. Filter syringe according to claim 1,

the outer circumferential surface of the outer cylinder member is formed with at least one catching groove, and the inner circumferential surface of the cylinder is formed with a fixing protrusion capable of being coupled to the catching groove.

5. Filter syringe according to claim 1,

the piston comprises a gasket, the gasket is combined in front of the piston, the outer peripheral surface of the gasket is tightly attached to the inner part of the needle cylinder,

the coupling shaft member is disposed inside the washer, and is attached such that a front portion of the coupling shaft member protrudes forward of the washer.

6. Filter syringe according to claim 5,

the coupling shaft member includes:

a locking protrusion formed in front of the coupling shaft member, protruding in front of the gasket, and coupled to one side of the filter member; and

and a fastening member formed behind the locking protrusion and protruding outward in the radial direction.

7. Filter syringe according to claim 6,

the fastening member has a disk shape, and when the coupling shaft member moves forward, the fastening member moves forward inside the washer so as to contact a rear surface of the washer.

8. Filter syringe according to claim 7,

the cross-sectional area of the locking projection decreases from the rear to the front, and the locking projection penetrates the filter member to be fixed after the injection liquid is discharged through the second path, thereby preventing reuse.