WO2017090817A1

WO2017090817A1 - Syringe filter structure and syringe having same

Info

Publication number: WO2017090817A1
Application number: PCT/KR2015/014015
Authority: WO
Inventors: 석원현; 채수민; 민정식
Original assignee: (주)상아프론테크
Priority date: 2015-11-24
Filing date: 2015-12-21
Publication date: 2017-06-01
Also published as: KR101632714B1

Abstract

A syringe filter structure and a syringe having the same are disclosed. According to the present invention, the syringe filter structure for filtering an injection fluid when the injection fluid, having flowed in through the rear part, is discharged through a syringe needle coupled to the front of a cylinder comprises: a filter part provided between the cylinder and the syringe needle, connected to the syringe needle, and having a first fluid path, into which the injection fluid flows, formed at one side thereof and a second fluid path, through which the injection fluid is discharged from the cylinder, formed at the other side thereof; a cylindrical filter holder having, therein, an accommodating part in which the filter part is accommodated, coupled with the syringe needle at the front of the accommodating part, coupled with the cylinder at the rear of the accommodating part, having, by means of the filter part, a first fluid path formed at one side of the accommodating part, and having a second fluid path formed at the other side of the accommodating part; and a stopper having a first protrusion part, which is formed on the outer surface thereof and inserted into and assembled in a first groove part formed at the cylinder, so as to prevent the filter part and the filter holder from being pushed back toward the rear of the cylinder.

Description

Filter structure for syringes and syringes having same

The present invention relates to a filter structure for a syringe and a syringe having the same.

Generally, syringes are used to draw blood from a patient's blood vessels or to collect fluids other than blood from the body. On the other hand, it is used to inject the drug directly into the blood vessel, or to inject the drug into the muscle or subcutaneous.

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

On the other hand, when injecting the injection liquid into the body through the syringe, in order to transfer the drug in the glass ampoule or inside the vial with the rubber stopper into the syringe, the upper part of the glass ampoule is cut and the needle is inserted through the cut part. It will inhale the drug you will inject.

When injecting the injection solution into the body through a conventional syringe, but not a large amount of fine glass particles or debris may be mixed with the injection liquid and sucked into the syringe so that the fine glass particles and the injection liquid are injected into the body together.

When such an injection solution is added to a patient, there is a problem in that fine glass particles are administered to the human body together with the injection solution, which adversely affects the health of the patient.

In addition, in the conventional syringe, the glass particles of the ampoule are filtered by the filter when the injection is inhaled, but when the injection is injected into the patient, the injection process is cumbersome because the injection must be performed after the filter containing the ampoule glass particles is removed.

One embodiment of the present invention is a syringe for injecting a glass particle of the ampoule while the injection process is easy to pass through the filter member when the injection is injected into the patient without the filter member when injecting the injection into the syringe A filter structure and a syringe having the same are provided.

According to an aspect of the present invention, a filter structure for a syringe for filtering when discharging the injection liquid introduced to the rear through the needle coupled to the front of the cylinder, is installed between the cylinder and the needle and connected to the needle A filter unit having a first fluid path through which the injection solution is introduced, and a second fluid path through which the injection solution is discharged from the cylinder at one side; An accommodating part accommodating the filter part is provided therein, the needle is coupled to the front of the accommodating part, the cylinder is coupled to the rear part of the accommodating part, and the first fluid path is connected to one side of the accommodating part by the filter part. Is formed, the other side of the receiving portion of the cylindrical filter holder in which the second fluid path is formed; And a stopper in which a first protrusion formed on an outer surface of the filter unit and the filter holder is pushed into the first groove formed in the cylinder so that the filter unit and the filter holder are not pushed behind the cylinder.

At this time, the stopper, the bottom surface is formed with the injection passage in the center; And a side surface extending vertically from the end of the bottom surface, the side having the assembly protrusion on the outside and the bottom end of the filter holder being intimately inserted inward, and the bottom end of the filter holder being a tapered portion whose outer diameter is reduced. Some may be inserted into the stopper.

At this time, the side free end diameter of the stopper may be provided with a plurality of incisions to be elastically deformed.

In this case, the filter unit is connected to the cylinder and selectively blocking the first fluid path to inject the injection liquid into the cylinder only through the first fluid path, and connected to the needle and selectively connects the second fluid path. It may further include a check valve for discharging the injection liquid to the outside of the cylinder only through the second fluid path.

In this case, the check valve may include a central portion through which a passage is opened so that the injection liquid is introduced only through the first fluid path and the injection liquid is introduced into the cylinder from the injection needle; It may be integrally formed on the outer side of the central portion, the passage is opened so that the injection liquid is discharged only through the second fluid path, the outer portion which is discharged from the cylinder to the needle.

In this case, the filter unit may include a filter member installed on the second fluid path and filtering the injection liquid discharged before passing through the check valve.

At this time, the filter unit is located between the check valve and the filter member, the front part is in close contact with the check valve, the rear part is in close contact with the filter member is a filter body for close contact with the check valve inside the filter holder receiving portion It may include.

In this case, the filter body may include an inlet hole into which the central portion of the check valve is inserted, and a radial discharge hole that forms part of the second fluid passage outside the inlet hole.

At this time, the outer surface of the filter holder is provided with a plurality of ribs in a direction parallel to the needle, the cylinder is provided with a plurality of rib grooves into which the rib is inserted, the filter holder can be prevented relative rotation with respect to the cylinder. .

According to another aspect of the invention, the fixing member is mounted to the front injection needle; A filter structure according to any one of claims 1 to 9 coupled with the fixing member; A cylinder coupled to the rear of the filter structure; And a piston which moves forward or backward with at least a part of the cylinder inserted into the cylinder to inject the injection liquid into the cylinder or to discharge the cylinder out of the cylinder.

At this time, the piston, the piston body is inserted into the cylinder to move along the cylinder; A gasket coupled to a front end of the piston body and inserted into close contact with the inside of the cylinder; And a fastening part protruding from a front end of the piston body and penetrating the gasket to couple to the piston body.

In this case, the fastening part may include a first hook part at a front end, and may be spaced apart from the first hook part to include a second hook part.

In this case, when the piston is advanced to the injection needle to the end and then back, the first hook portion is caught by the check valve of the filter structure, and the second hook portion is caught by the stopper of the filter structure and moves backward.

A syringe having a filter structure for a syringe according to an embodiment of the present invention includes a filter structure so that the injection process is performed by passing through the filter member when injecting the injection liquid to the patient without injecting the injection liquid into the syringe. It is simple and can prevent foreign objects from being injected into the patient.

The syringe having a filter structure according to an embodiment of the present invention prevents reuse of the needle and at the same time prevents the needle from exiting the outside, thereby preventing a safety accident in the needle during the disposal of the syringe.

In addition, the syringe having a filter structure according to an embodiment of the present invention can prevent the filter holder from being pushed backward by the stopper, thereby preventing a defect that the filter structure is pushed and separated when the needle is pushed.

1 is a perspective view showing a syringe having a filter structure for a syringe according to an embodiment of the present invention.

Figure 2 is an exploded perspective view showing a syringe having a filter structure for a syringe according to an embodiment of the present invention.

3 is a cross-sectional view showing a syringe having a filter structure for a syringe according to an embodiment of the present invention.

Figure 4 is an exploded perspective view showing a filter structure for a syringe according to an embodiment of the present invention.

5 is a half sectional perspective view of a filter holder which is a component of a filter structure for a syringe according to an embodiment of the present invention.

6 is a half sectional perspective view of a filter body which is a component of a filter structure for a syringe according to an embodiment of the present invention.

7 is a half cross-sectional perspective view of a stopper that is part of a filter structure for a syringe according to one embodiment of the present invention.

8 to 11 are cross-sectional views of a syringe according to an embodiment of the present invention, showing the states of discharging the injection liquid in chronological order.

12 is a cross-sectional view of a state in which the bending groove of the syringe according to an embodiment of the present invention may be exposed to the outside of the cylinder and be broken.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention. In the drawings, parts irrelevant to the description are omitted in order to clearly describe the present invention, and like reference numerals designate like elements throughout the specification.

In this specification, terms such as "comprise" or "have" are intended to indicate that there is a feature, number, step, action, component, part, or combination thereof described on the specification, and one or more other features. It is to be understood that the present invention does not exclude the possibility of the presence or the addition of numbers, steps, operations, components, parts, or combinations thereof. In addition, when a part such as a layer, film, region, plate, etc. is said to be "on" another part, this includes not only when the other part is "right on" but also another part in the middle. Conversely, when a part such as a layer, film, region, plate, etc. is "below" another part, this includes not only the other part "below" but also another part in the middle.

Hereinafter, a syringe filter structure and a syringe including the same according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings. In addition, in one embodiment of the present invention, the injection means a substance in which foreign substances such as a chemical solution and glass particles are mixed.

In the following description, as shown in FIG. 1, the cover side is set forward in the piston, and the piston side is defined rearward in the cover.

Referring to FIG. 1, a syringe 1 including a filter structure () for a syringe according to an embodiment of the present invention includes a needle hub 30, a cylinder 11, a piston 10, and a filter structure 100. It may include.

The syringe 1 including the filter structure 100 for a syringe according to an embodiment of the present invention includes the filter structure 100 when the injection liquid is injected into the syringe 1 without passing through the filter member 130. When the injection to the patient to pass through the filter member 130, the injection process is simple, but the foreign matter may not be injected into the patient.

2 is an exploded perspective view showing a syringe 1 having a filter structure 100 for a syringe according to an embodiment of the present invention. 3 is a cross-sectional view showing a syringe 1 having a filter structure 100 for a syringe according to an embodiment of the present invention.

1 and 2, in one embodiment of the present invention, the needle hub 30 includes a cover 33 covering the fixing member 31 and the injection needle 34 on which the needle 34 is mounted. It may include.

As shown in FIG. 2, in one embodiment of the present invention, the injection needle 34 may be mounted to the front portion of the fixing member 31. In addition, a collar 32 may be formed at the rear portion of the fixing member 31.

On the other hand, in one embodiment of the present invention, the fixing member 31 has a cylindrical shape at least a portion of the filter holder 140, for example, as shown in Figure 3, the fixing member 31 may be inserted and fixed.

2 and 5, in one embodiment of the present invention, the collar 32 of the fixing member 31 is inserted between the pillar portion 142 and the outer tube 143 of the filter holder 140. To be assembled. Therefore, the injection liquid injected and discharged through the filter holder 140 passes through the pillar portion 142 and the needle 34 of the hub.

The cylinder 11 has the filter structure 100 installed therein, and the piston 10 is installed to reciprocate in the cylinder 11. Therefore, the cylinder 11 receives or discharges the injection liquid according to the operation of the piston 10.

The piston 10 is mounted inside the cylinder 11, the gasket 19 is assembled to the front end to prevent the injection liquid is discharged to the rear, and to apply pressure to the cylinder 11 to enter or exit the injection liquid It becomes possible.

2, the piston 10 is provided with a coupling shaft 17 and a coupling collar 15 corresponding to the fastening portion at the front end of the piston body 13, and the coupling shaft 17 is provided. And the piston 10 is assembled with the gasket 19 by means of a coupling collar 15. The coupling shaft 17 is provided with a first hook portion 17a at its front end, and is provided with a second hook portion 17b spaced apart from the first hook portion 17a.

At this time, when the piston 10 is advanced to the injection needle 34 to the end and then back, the first hook portion 17a is caught by the check valve 110 of the filter structure 100, the second hook The portion 17b is caught by the stopper 150 of the filter structure 100 and retracts together.

2, the gasket 19 is made of a flexible material, and is assembled to the front end of the piston 10 to apply pressure to the injection liquid while being in close contact with the wall of the cylinder 11. .

2, the cutting groove 13a is formed in the piston body 13 so that the piston body 13 may be cut after use.

Referring to FIG. 2, the filter structure 100 includes

filter units

110, 120, and 130, a filter holder 140, and a stopper 150.

2, the filter unit is installed between the cylinder 11 and the injection needle 34 and connected to the injection needle 34, and a first fluid path through which the injection liquid is introduced is formed at one side thereof. On the other side, a second fluid path through which the injection liquid is discharged from the cylinder 11 is formed.

The

filter unit

110, 120, 130 includes a check valve 110, a filter body 120, and a filter member 130 from the front.

2, 4, and 8, the check valve 110 is connected to the cylinder 11 and selectively blocks the first fluid path so that the injection liquid into the cylinder 11 only through the first fluid path. And the injection fluid is connected to the needle 34 to selectively block the second fluid path to discharge the injection liquid to the outside of the cylinder 11 only through the second fluid path.

The check valve 110 is formed by the central portion 111 and the outer portion 112 is formed integrally.

2 and 4, the central passage is opened so that the injection liquid flows only through the first fluid path, and the injection liquid flows from the injection needle 34 to the cylinder 11. .

Referring to FIG. 4, the center part 111 is opened in the center in a lower direction on the basis of the drawing so that the injection liquid can be transferred only in the lower direction, and closed so that the injection liquid does not flow in the opposite direction, that is, in the upper direction. Thus, the unidirectional check valve is realized.

2 and 4, the outer part 112 is integrally formed on the outer side of the central part 111 and the outer passage is opened so that the injection liquid flows out only through the second fluid path. Is discharged from the needle (34).

The outer part 112 is made of a flexible material, and the outer part 112 is flexed in an upward direction only and the outer passage is opened based on the drawing of FIG. 4 to form a part of the second fluid path. Of course, if the pressure in the opposite direction, the downward direction is closed. A plurality of ribs 112a are formed in the outer portion along the radial direction to help serve as a general check valve.

The check valve 110 eventually controls the injection solution so that the injection liquid introduced through the injection needle 34 flows through the central portion 111 and the discharged injection liquid is discharged through the outer portion 112.

2 and 8, the filter body 120 is located between the check valve 110 and the filter member 130, the front portion is in close contact with the check valve 110, the rear portion is the filter In close contact with the member 130, the check valve 110 is brought into close contact with the inside of the filter holder 140 and the receiving part 141a.

4, the filter body 120 includes an inflow hole 121 into which the central portion 111 of the check valve 110 is inserted, and the second fluid passage outside the inflow hole 121. It has a radially disposed discharge hole 122 forming a part of.

The injection liquid flows into the inflow hole 121 of the filter body 120 and forms a part of the first fluid passage. The inlet hole 121 has a stepped portion 121a formed so that an upper portion thereof is smaller in diameter than the lower portion with reference to FIG. 8. The stepped portion 121a acts so that the front end portion of the piston 10 can easily pass through the inflow hole 121, but does not fall out well.

Two discharge holes 122 are formed and constitute a part of the second fluid passage as described above.

The filter body 120 is formed in the form of a double tube eventually provided with two transfer passages, one of which is part of the first fluid passage, the other is part of the second fluid passage. Therefore, the injection liquid is introduced through the inlet hole 121 when entering the cylinder 11, and is discharged through the discharge hole 122 when exiting the injection needle 34.

An assembly ring portion 121b is provided at the bottom surface of the filter body 120 to protrude from the inlet hole 121. The assembly ring 121b is inserted into the filter member 130, and the filter member 130 is assembled to the filter body 120. By the assembling ring 121b, the filter member 130 having a ring shape can properly hold an assembly position on the bottom surface of the filter body 120.

2 and 8, the filter member 130 is installed on the second fluid path and filters the injection liquid discharged before passing through the check valve 110.

The filter member 130 is assembled to the bottom surface of the filter body 120, in particular, to cover the discharge hole 122. By assembling so as to cover the lower end of the discharge hole 122, the injection liquid discharged along the second fluid path is filtered.

The filter member 130 has a flat ring shape, and is assembled by the assembly ring part 121b of the filter body having a similar thickness.

Meanwhile, referring to FIGS. 2 and 5, the filter holder 140 includes an accommodating part 141a in which the

filter parts

110, 120, and 130 are accommodated, and the scan in front of the accommodating part 141a. Needle 34 is coupled, the cylinder 11 is coupled to the rear of the receiving portion (141a), the first fluid path is formed in the central portion of the receiving portion (141a) by the filter unit (110, 120, 130) The outer portion of the receiving portion 141a has a cylindrical shape in which the second fluid path is formed.

Referring to FIG. 2, the filter holder 140 is provided with a plurality of ribs 143a in a direction parallel to the needle 34 on the outer surface thereof, and the ribs 143a are inserted into the cylinder 11. A plurality of rib grooves 11b are provided, and the filter holder 140 is prevented from rotating relative to the cylinder 11.

5, the filter holder 140 is formed such that the receiving portion 141a and the pillar portion 142 communicate with each other, and the pillar portion 142 is spaced apart from the pillar portion 142 by a predetermined interval. The outer tube 143 is formed in the form of a double tube. The outer tube 143 and the receiving portion outer wall 141 has a cylindrical shape having an outer diameter of approximately the same diameter.

2 and 5, the O-ring groove 140a is formed on the outer surface of the filter holder 140 to assemble the O-ring 35.

Referring to FIG. 5, the filter holder 140 includes a plurality of ribs 143a along a vertical direction on an outer surface of the outer tube 143. As described above, the rib 143a is inserted into the rib groove 11b inside the cylinder 11 to prevent rotation.

5 and 8, the filter holder 140 has a collar of the hub 30 so that the needle hub 30 does not fall out after assembly along the horizontal direction inside the outer wall of the outer tube 143. An escape prevention ring 143b is formed to protrude. As described above, the lower part of the fixing member 31 of the hub 30 is inserted and assembled between the pillar part 142 and the outer tube 143.

5 and 8, the filter holder 140 has a ring-shaped assembly ring groove 141c formed horizontally in the receiving portion 141a and is formed to protrude on the outer surface of the filter body 120. A ring 122a is inserted into the assembly ring groove 141c to fix the filter body 120 to the filter holder accommodation portion 141a.

5 and 8, the filter holder 140 includes a taper portion 141b on the outer wall 141 of the receiving portion 141a. The free end 153 of the stopper 150 is assembled to the tapered portion 141b in close contact. Of course, the tapered portion 141b is inserted into the free end 153 of the stopper 150.

As a result, the filter holder 140 serves to fix the needle hub 30 in the front part and to accommodate the

filter parts

110, 120, and 130 by providing the receiving part 141a in the rear part.

Meanwhile, referring to FIGS. 2 and 7, the stopper 150 includes a first protrusion 152b formed on an outer surface of the stopper 150 so that the

filter units

110, 120, 130 and the filter holder 140 are not pushed to the rear of the cylinder 11. Is inserted into the first groove 11a formed in the cylinder 11 and assembled.

Referring to FIG. 7, the stopper 150 extends vertically from an end of the bottom surface 151 having an injection hole central hole 151a formed at the center thereof, and a first projection portion outside the bottom surface 151. 152b) and a lower end portion of the filter holder 140 includes a side surface 152 which is tightly inserted into the inside.

At this time, as described above, the lower end of the receiving portion outer wall 141 of the filter holder 140 is made of a taper portion 141b whose outer diameter is reduced and partially inserted into the stopper 150.

In this case, referring to FIG. 7, the diameter of the free end 153 of the side surface 152 of the stopper 150 is provided with a plurality of cutouts 152a to be elastically deformed.

A step 151b is formed in the central hole 151a of the bottom surface 151 so that the second hook portion 17b of the piston 10 is caught.

Since the stopper 150 is fixed to the cylinder 11 through the first protrusion 152b, the stopper 150 has the

filter unit

110, 120, 130 when the needle 34 is pushed backward. And the filter holder 140 is prevented from being pushed.

Here, referring to FIG. 8, since the free end 153 of the stopper 150 is in close contact with the taper portion 141b of the filter holder 140, the injection needle 34 is attached to the patient's body. When a force is applied to the filter holder 140 rearward as in the case of entering, the taper portion 141b of the filter holder 140 pushes the free end 153 of the stopper 150. At this time, the tapered portion 141b applies the force to the free end 153 in a direction perpendicular to the hypotenuse on the cross section of the tapered portion 141b, and includes a force pushing the free end 153 to the wall of the cylinder 11. That is, when the filter holder 140 is pushed backward, the free end 153 of the stopper is pushed to the wall of the cylinder 11 by the tapered portion 141b, and finally the force is applied by the taper 141b. The stopper 150 more tightly adheres to the wall of the cylinder 11. Therefore, as the filter holder 140 is pushed harder, the stopper 150 is more firmly held in place.

On the contrary, when the piston 10 is fully advanced and then retracted, the free end 153 of the stopper because the second hook portion 17b is caught by the middle hole 151a of the bottom surface 151. Is forced inwardly to retract with its piston 10 very easily out of its position.

1, a syringe 1 according to one embodiment of the invention is shown. Referring to this, when the cover 33 is removed, and the piston 10 is held by the hand and moved to the rear side, as shown in FIG. 3, the injection liquid is introduced into the cylinder 11 through the first fluid passage. It is introduced through the injection needle (34). The injection liquid passing through the injection needle 34 passes through the inside of the pillar part 142 of the filter holder 140. After passing through the central portion 111 of the check valve 110, and through the inlet hole 121 of the filter body 120 and the central hole 151a of the stopper 150 in order and then the cylinder ( 11) It reaches inside.

Thereafter, when the piston 10 is moved forward, the injection liquid inside the cylinder 11 is discharged through the injection needle 34 through the second fluid passage, and the injection liquid is discharged by the filter member 130. The foreign matter contained in the filter is filtered out, and only pure injection liquid is put into the patient's body.

Referring to FIG. 8, when the injection liquid is injected into the body of the patient, the filter holder 140 is pushed backward by the resistance friction as the needle 34 enters the body of the patient, as described above. By the action of the taper portion 141b of the filter holder 140 and the free end 153 of the stopper 150, the stopper 150 is more strongly maintained in the cylinder 11, and thus the other parts They will be pushed back to prevent them from leaving their seats.

Referring back to FIG. 8, when the piston 10 is pushed forward, the injection liquid in the cylinder 11 passes through the second fluid path and then is discharged through the injection needle 34. At this time, as the gasket 19 is pushed forward, the injection liquid in the cylinder 11 passes through the central hole 151a of the stopper 150, and then the center 111 of the check valve 110 is closed. Since it is in a state of being moved radially outward to pass through the filter member 130. At this time, if there is a foreign material is filtered by the filter member 130. The injection liquid passing through the filter member 130 passes through the discharge hole 122, passes through the outer portion 112 of the check valve 110, and passes through the pillar portion 142 of the filter holder 140. Discharged to (34).

Referring to Figure 9, it can be seen that the injection solution is completely discharged. At this time, the gasket 19 is in close contact with the stopper 150.

Referring to FIG. 10, when the piston 10 is pushed further forward in this state, the gasket 19 is not advanced further, but the piston body 13 is further advanced. At this time, as the piston body 13 moves forward, the first and

second hook portions

17a and 17b pass through the stopper 150, the filter body 120, and the check valve 110 in the order of interference fit. You can feel the change in pressure by hand.

Referring to FIG. 11, as the piston body 13 is as advanced as possible, the first hook portion 17a is caught after passing through the check valve center portion 111, and the second hook portion 17b is After passing through the central hole 151a of the stopper 150, the stopper 151b is caught.

In the state as shown in FIG. 11, when the piston 10 is reversed, the state as shown in FIG. 12 is obtained. That is, parts including the injection needle 34 in front of the piston 10 all move backward along the piston 10. If the cutting groove 13b of the piston 10 is seen outside the cylinder 11, it is cut and disposed of. At this time, since the free end 153 is easily retracted inward, the stopper 150 can be separated from the assembly position without a great force.

In this way, the syringe 1 including the filter structure 100 according to the embodiment of the present invention prevents reuse of the needle 34 and at the same time prevents the needle from exiting the outside, thereby injecting the syringe in the process of discarding the syringe. You can also prevent accidents caused by needles.

A syringe including a filter structure for a syringe according to an embodiment of the present invention includes a filter structure to inject an injection solution into a patient without passing through the filter member 130 when the injection solution is injected into the syringe. This allows the injection process to be simple while preventing foreign objects from being injected into the patient.

Although one embodiment of the present invention has been described above, the spirit of the present invention is not limited to the embodiments set forth herein, and those skilled in the art who understand the spirit of the present invention, within the scope of the same idea, the addition of components Other embodiments may be easily proposed by changing, deleting, adding, and the like, but this will also fall within the spirit of the present invention.

Claims

A filter structure for a syringe for filtering when discharging the injection liquid introduced backward through the needle coupled to the front of the cylinder,

The filter unit is installed between the cylinder and the needle and connected to the needle, the first fluid path is formed on one side and the injection fluid is introduced, the filter part is formed on the other side is formed with a second fluid path from which the injection liquid is discharged from the cylinder. ;

An accommodating part accommodating the filter part is provided therein, the needle is coupled to the front of the accommodating part, the cylinder is coupled to the rear part of the accommodating part, and the first fluid path is connected to one side of the accommodating part by the filter part. Is formed, the other side of the receiving portion of the cylindrical filter holder in which the second fluid path is formed; And

A stopper inserted into the first groove formed in the cylinder and assembled to the first protrusion formed on the outer surface such that the filter unit and the filter holder are not pushed behind the cylinder;

Filter structure for a syringe comprising a.
The method of claim 1,

The stopper is,

A bottom surface with an injection passage formed in the center;

A side surface extending vertically from an end of the bottom surface to have the assembly protrusion on the outside and one end of the filter holder to be in close contact with the inside;

Including;

One end of the filter holder is made of a tapered portion that the outer diameter is reduced is partially inserted into the stopper filter structure for the syringe.
The method of claim 2,

And a plurality of cutouts so that the diameter of the side free end of the stopper can be elastically deformed.
The method of claim 1,

The filter unit,

A second fluid path connected to the cylinder and selectively blocking a first fluid path to introduce the injection liquid into the cylinder only through the first fluid path, and connected to the needle and selectively blocking the second fluid path A filter structure for a syringe including a check valve for discharging the injection to the outside of the cylinder only through.
The method of claim 4, wherein

The check valve,

A central portion through which a passage is opened such that the injection liquid flows only through the first fluid path, and the injection liquid flows from the injection needle into the cylinder;

An outer portion formed integrally with the outer side of the central portion, the passage being opened so that the injection liquid flows out only through the second fluid path and discharged from the cylinder to the needle;

Filter structure for a syringe comprising a.
The method of claim 1,

The filter unit,

And a filter member installed on the second fluid path and filtering the injection liquid discharged before passing through the check valve.
The method of claim 6,

The filter unit,

Located between the check valve and the filter member, the front portion is in close contact with the check valve, the rear portion is in close contact with the filter member includes a filter body for contacting the check valve in close contact with the inside of the filter holder receiving portion .
The method of claim 7, wherein

The filter body has an inlet hole is inserted into the central portion of the check valve, the filter structure for a syringe having a radial discharge hole forming a portion of the second fluid passage outside the inlet hole.
The method of claim 1,

The outer surface of the filter holder is provided with a plurality of ribs in a direction parallel to the needle, the cylinder is provided with a plurality of rib grooves in which the rib is inserted, the filter holder is a filter structure for preventing relative rotation with respect to the cylinder .
A fixing member equipped with an injection needle in the front;

A filter structure according to any one of claims 1 to 9 coupled with the fixing member;

A cylinder coupled to the rear of the filter structure; And

A piston configured to move forward or backward with at least a portion of the cylinder inserted into the cylinder to inject the injection liquid into the cylinder or to discharge the cylinder out of the cylinder;

Syringe comprising.
The method of claim 10,

The piston,

A piston body inserted into the cylinder and moving along the cylinder;

A gasket coupled to a front end of the piston body and inserted into close contact with the inside of the cylinder; And

And a fastening part protruding from the front end of the piston body and penetrating the gasket to be coupled to the piston body.
The method of claim 11,

The fastening portion has a first hook portion at the front end, a syringe having a second hook portion spaced apart from the first hook portion.
The method of claim 12,

And the first hook portion is caught by a check valve of the filter structure, and the second hook portion is caught by a stopper of the filter structure and retracts together.