KR20160029497A

KR20160029497A - Medical feeltering member for inning drug

Info

Publication number: KR20160029497A
Application number: KR1020140119112A
Authority: KR
Inventors: 백정흔
Original assignee: 백정흔
Priority date: 2014-09-05
Filing date: 2014-09-05
Publication date: 2016-03-15

Abstract

A filter housing member having a through hole through which an injection liquid passes and which can be coupled to and detached from an injecting unit or a medical three-way valve of a syringe; and a filter inserted and fitted in the filter housing member and sintered and molded with a resin material, And a locking jaw protruding from the inner surface of the filter is provided to support at least one edge of the filter.

Description

&Lt; Desc / Clms Page number 1 > MEDIUM FEELING MEMBER FOR INNING DRUG &

TECHNICAL FIELD The present invention relates to a medical drug infusion filter for filtering foreign matters contained in an injection solution applied to a medical instrument used for injecting an injection solution into a human body or the like.

A medical institution includes a disposable syringe as a medical device for injecting an injection fluid into a patient. When a fluid is transfused or transfused in a medical institution, another medical fluid is mixed or injected. In order to collect the fluid flowing through the fluid channel, Is used.

Generally, a disposable syringe is for administering an injection liquid to a human body of a patient, and comprises a cylinder, a piston, and an injection needle.

Therefore, in order to fill the space in the cylinder of the syringe with the injection liquid, the upper portion of the glass ampule 6 is broken and opened as shown in FIG. 4, and then the end of the injection needle 9 (see FIG. 3) When the ampoule 6 is cut in this process, fine glass powder is precipitated in the injection liquid contained in the ampoule 6, and the fine glass powder thus precipitated is injected into the cylinder (not shown) together with the injection liquid. 13, see FIG. 8), and is directly administered to the patient, there is a problem that the glass powder is left in the blood of the patient's body, or digested into the skin, .

Therefore, in some cases, the filter 4 is provided therein to protect the injection needle 9, while preventing the introduction of foreign substances such as fine glass powder precipitated when the ampoule 6 filled with the injection liquid is cut, A filter needle 1 is used.

The filter needle 1 has a cylindrical body 7 into which an injection unit 12 (see FIG. 8) of the injector 2 is inserted, and a needle 9 integrally formed at the tip of the body 7 And the filter portion 5 is inserted in the inside.

Therefore, as shown in FIGS. 1 and 2, the filter 4 inserted between the upper and lower rubber rings 10 is inserted into the body 7, and the ampoule 6 ), It is possible to prevent foreign matter such as fine glass powder precipitated from being deposited and to use safely.

However, the filter unit 5 tends to tear the edge of the filter 4 during the manufacturing process of fusing the filter 4 between the rubber rings 10 with the high frequency in a state where the filter 4 is positioned, and the glass powder passes through the torn hole, There is a problem that it can be introduced into the cylinder 13 of the syringe 2 without being introduced into the cylinder.

3, the filter 4 is inserted into the space between the suction portions 8, to which the body 7 and the injection needle 9 are coupled, .

However, since the filter needle 1 is manufactured by separately manufacturing the body 7 and the suction unit 8, the manufacturing process is complicated and the manufacturing cost is increased.

Also, the filter 4 uses a membrane filter or the like. In this case, the membrane filter is deformed due to the pressure at the time of sucking and discharging the injection liquid, and the filter structure is broken.

In addition to injecting the injectate directly into the patient using a syringe, there is a method of injecting the injectate using a three-way valve during transfusion or fluid therapy.

The conventional three-way valve is constituted by a main body portion having a branch pipe through which a fluid can flow, which is connected to three branch openings, and a handle portion formed by a flow path switching portion and integrally formed with the flow path switching portion, And a selection of a combination of branch pipes through which the chemical solution communicated with the organs flows out is made possible.

Of the three branch pipes in the conventional three-way valve, the first branch pipe and the second branch pipe are arranged so as to form a straight line flow path when they communicate with each other, and this flow path serves as a main line. Further, the branch pipe arranged so as to be vertically positioned on the main line is used as the third branch pipe, and the chemical liquid is mixedly injected or collected in the third branch pipe. The communicating flow path has a T shape.

However, glass fragments and rubber fragments from ampoules and vials used as injection containers are mixed with drugs, and when they are injected into a syringe, they enter the body when they are injected and usually remain in the site, Through the lungs, through the liver, spleen, and other organs to the kidney. When these glass fragments occlude blood vessels, they block the blood supply and cause chronic tissue necrosis, vascular granuloma, embolism, etc. In addition, injections of ampule-type anticancer drugs injected into the vertebrae can also enter the spinal fluid, I can go to the brain.

In order to solve such a problem, the present applicant has proposed a medical three-way valve having a built-in filter in which a filter is incorporated in a branch pipe of a three-way valve through a public utility model 20-2013-0002001.

That is, a filter is built in the third branch tube provided so as to inject the injection liquid from the outside among the first, second and third branches branched in three directions, so that the injection liquid injected through the third branch tube And to a configuration capable of filtering the contained glass fragments or rubber fragments.

However, when the filter is installed in the branch pipe as described above, the following problems have been found. In other words, injection fluid may be injected through the third branch tube branched into a 'T' shape in the first and second branch tubes connected in a straight line, and the fluid may be injected in some cases. It has been found that the liquid can not be supplied normally due to the filter. That is, in the case of the injection liquid, since the injection liquid is pushed in at a high pressure, the filter can be injected by talking, but in the case of the liquid, it is impossible to apply the high pressure artificially.

In this case, it is difficult to secure the airtightness by inserting a filter made of a metal material into the interior of a medical instrument and attaching a medical instrument formed of a resin material, There is a problem that it can not be stably fixed to the mechanism.

In addition, when the filter is formed of a metal material, there is a possibility of deformation of the drug when it comes into contact with a drug having chemical properties, which poses a safety problem.

Public utility model 20-2013-0002001

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and it is an object of the present invention to provide a medical drug infusion filter which is configured to filter out foreign matter when injecting an injection solution and can be stably and rigidly mounted, thereby improving durability and stability.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and it is an object of the present invention to provide a medical multi-function device having an improved structure for selecting a filter so as to filter out foreign matter when injecting an injecting solution, Valve assemblies.

In order to achieve the above object, the medical drug infusion filter according to the present invention comprises: a filter receiving member having a through hole through which an injection solution passes, the filter receiving member being connectable to and detachable from an injector or a medical three- And a filter inserted and installed in the filter housing member and sintered and molded from a resin material. The filter housing member is formed with a latching protrusion protruding from the inner surface of the filter housing member to support at least one edge of the filter, .

Here, the engagement jaw is formed continuously in the circumferential direction on the inner circumferential surface of the filter housing member, and the protruding height gradually increases in the direction in which the filter is introduced for mounting, so that the inclined surface guiding the entry of the filter desirable.

Further, it is preferable that a pair of the latching jaws are formed, and the filter is sandwiched between them.

The filter housing may further include a support protrusion protruding from an inner circumferential surface of the filter housing member to contact and support the rim of the other surface of the filter mounted to be caught by the protrusion.

In addition, the filter housing member may include a body having a space portion into which an injecting portion of the injector is inserted, the body being formed in the engaging jaw; And a suction unit provided at one side of the body and coupled with the injection needle.

The filter housing member is detachably coupled to a medical three-way valve having first to third branch pipes branched to communicate with the body, the filter housing member being selectively communicated or blocked by the flow path switching member, It is preferable to be able to be coupled to any one of the third branch pipes.

The filter housing member may include a cylindrical first coupling portion formed at one end and coupled to any one of the first to third branch pipes; A cylindrical coupling pipe inserted into a branch pipe having a smaller diameter than the first coupling unit and coupled with the first coupling unit and connected to the first coupling unit; And an injection pipe extending in a cylindrical shape at a connection portion between the first engagement portion and the connection pipe and communicating with the connection pipe, wherein the filter is installed inside the injection pipe.

The filter housing may further include a cap member detachably coupled to an end of the filter housing member.

The medical drug infusion filter of the present invention forms an undercut in the space inside the body so as to be spaced apart from the body so as to insert and fix the filter so as to prevent the edges of the filter from being torn and foreign substances such as glass and rubber powder to flow into the syringe So that the injection liquid can be safely injected into the human body.

In addition, the drug infusion filter according to the present invention has a simple structure, thereby shortening the manufacturing process, reducing manufacturing cost, improving productivity, and minimizing the incidence of defective filter.

According to the medical three-way valve assembly to which the medical drug infusion filter according to the present invention is applied, a filter accommodating member incorporating a filter can be selectively connected to be used, so that when the injecting solution is injected, In addition, when the liquid is injected, there is an advantage that the liquid can be smoothly injected by separating the filter.

In addition, the medical drug infusion filter of the present invention is provided with a filter formed by sintering with a resin material, so that it can be mounted in a forced fit manner while minimizing the deformation of the filter housing member, which is the same resin material, when mounted on the filter housing member. It is also possible to prevent the problem (breakage of the filter structure due to suction pressure) of a conventional paper-made membrane.

In addition, when the filter is formed of stainless steel or the like in the related art, it is possible to prevent the filter structure from being broken. However, when the metal material (stainless steel material) is in contact with a chemical substance having chemical properties such as acidity, However, when the filter made of a resin material as described herein is applied, all the problems of the conventional metal filter can be solved.

1 is a plan view showing a filter unit in a conventional filter needle.
2 is a cross-sectional view showing a filter portion in a conventional filter needle.
3 is an exploded perspective view showing a conventional filter needle.
4 is a front view showing the opened state of the glass ampule.
5 is a perspective view showing a filter needle to which a medical drug infusion filter according to an embodiment of the present invention is applied.
Figure 6 is a cross-sectional view of the filter needle of Figure 5;
Figure 7 is an end view of the filter needle of Figure 5;
FIG. 8 is a cross-sectional view showing an example of use of the filter needle of FIG. 5;
9 is a perspective view showing a medical three-way valve to which a medical drug infusion filter according to another embodiment of the present invention is applied.
10 is an exploded perspective view of the medical three-way valve shown in FIG.
11 is a plan view for explaining a case where the third branch pipe is not used.
12 is a plan view for explaining a process of injecting an injection using a syringe in a state where a filter accommodating member is connected to a third branch pipe.
13 is a plan view showing a state in which the filter housing member is removed from the third branch pipe and connected to the liquid pipe.
14 is a cross-sectional view showing the filter housing member shown in Fig.
15A to 15C are sectional views for explaining the operation of the flow path switching member.
16 is a perspective view showing a medical three-way valve according to another embodiment of the present invention.

Hereinafter, a medical drug infusion filter according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

FIGS. 5 to 8 are views showing a medical drug infusion filter 100 according to an embodiment of the present invention. In the course of opening the syringe ampoule 6 and the vial, the glass powder 11 and the rubber powder An example in which a foreign substance including a foreign matter is not sucked into a cylinder of a syringe like an injection solution and is applied to a filter needle coupled to a syringe will be described. Hereinafter, the medical drug infusion filter will be referred to as the filter needle 100 for convenience of explanation. The filter needle 100 has a structure in which a filter 140 for filtering foreign substances is inserted.

The filter needle 100 includes a body 101 into which a syringe injection unit 12 is inserted in a cylindrical shape into which an injection unit 12 of a syringe 2 is inserted and an ampule 6 The injector needle 102 is inserted into the inner space of the body 101 and inserted into the space 103. The filter 103 is inserted into the inner space of the body 103, 140 are protruded from the outer circumferential surface of the protruding portion. The catching jaws 105 are arranged at regular intervals along the circumferential direction on the inner circumference of the space portion 103 and are formed so as to gradually protrude from the direction A in which the filter 140 enters. When the filter 140 is engaged, the filter 140 slides along the inclined surface 105a of the engaging jaw 105 and passes through the engaging jaw 105 in a so-called one-touch manner, It is possible to securely fix the filter 140 without moving the filter 140 in the direction opposite to the direction A by attaching the edge face of the one end 141 of the filter 140 to the stepped face 105b corresponding to the face 105a.

Since the filter 140 has a sintered structure as a resin material, when the filter 140 passes through the engagement protrusions 105 formed of the same resin material, the engagement protrusions 105 are not cut, So that the filter 140 can pass through and be mounted.

Accordingly, the filter 140 can be inserted into the space portion 103 and fixed firmly.

The inner circumferential surface of the inner space 103 of the body 101 of the filter needle 100 is provided with an outer circumferential surface at a position spaced apart from the engaging protrusion 105 by a predetermined distance, The support jaws 106 of the base plate 110 are protruded. The support jaws 106 are arranged on the inner circumferential surface of the space portion 103 at regular intervals in the circumferential direction and are integrally formed with the body 101 in the same manner as the engagement jaws 105. It is preferable that the distance L between the supporting jaw 106 and the engaging jaw 105 is formed to be equal to the thickness t of the filter 140. Therefore, the filter 140 can be securely fixed and fixed between the support jaw 106 and the engagement jaw 105 without moving.

The inner diameter of the space portion 103 formed inside the body 101 gradually narrows to form a suction portion 107 to which the injection needle 102 is coupled.

In addition, the body 101 is formed such that its inner diameter gradually decreases gradually from the open end 101a toward the suction portion 107. [ When the filter 140 is inserted from the open end portion 101a into the space portion 103, the filter 140 is inserted with sufficient space. However, in a state in which the filter 140 is supported by the support protrusion 106 via the engagement protrusion 105, Can be tightly coupled to the inner circumference of the space portion 103. Therefore, it is possible to completely prevent the gap between the body 101 and the filter 140 from being generated, so that it is possible to fundamentally prevent the foreign matter such as a piece of glass from passing through.

The filter 140 has a circular coin shape having a predetermined thickness t. The filter 140 is a filter manufactured by sintering and molding a resin material into a sintered structure to remove minute foreign matter. The filter 140 may have a filter structure of about 5 mu m or less.

The filter 140 sintered and molded in the resin material is securely fixed in the space portion 103 of the body 101 so that the ampule 6 The filter 140 is fixed in the state of being caught by the stopper 105 so that the filter 140 is kept in a fixed state due to the suction force of the syringe 2 Foreign matter can be filtered.

According to another embodiment of the present invention, an undercut may be formed to be annularly drawn around the inner circumferential surface of the space portion 105 so that the front surface and the back surface of the filter 140 can be supported in a solid state.

8 is a cross-sectional view showing the use state of the filter needle 100 according to the present invention. After the injection section 12 of the syringe 2 is inserted into one side of the body 101 of the filter needle 100, 2 by the linear motion of the piston 14 located in the cylinder 13 of the ampule 6.

Therefore, if the upper end of the ampoule 6 is first opened and then the injection needle 102 of the filter needle 100 is inserted into the inside of the ampoule 6 to inhale the injection liquid, Is injected into the cylinder 13 of the syringe 2 and then the filter needle 100 is separated and injected into the injection part 12 of the syringe 2 102) to inject the injection safely into the patient.

9 to 14, a medical three-way valve 200 to which a medical drug infusion filter according to an embodiment of the present invention is applied includes a valve body 20, a flow path switching member 30, and the valve body 20, And a medical drug infusion filter detachably coupled to the medical drug infusion filter. Here, the drug infusion filter has a filter housing member 40 and a filter 70 installed inside the filter housing member 40.

The valve body 20 has a cylindrical body 21 and first, second and third branch pipes 22, 23 and 24 branched to communicate with the body 21. The body 21 has a structure in which a lower portion thereof is closed and an upper portion thereof is opened so that the flow path switching member 30 is coupled, and the first to third branches 22, 23, 24 are branched so as to communicate in three directions.

The first to third branch pipes 22, 23, 24 may be arranged at 90 degree angles to each other, but this is merely an example and it is natural that it can be branched at various angles. The first and second branch pipes 22 and 23 are used when the liquid or blood transfusion therapy is performed. For example, the first and second branch pipes 22 and 22 are connected to each other by a container And the second branch pipe (23) is connected to a supply pipe to which a needle is connected. A first cap member 25 is detachably coupled to the first branch pipe 22 and a connector 26 and a second cap member 27 are connected to the second branch pipe 23. The first and second cap members 25 and 26 are used to separate the first and second branch pipes 22 and 23 from each other when the fluid or blood is transfused.

The third branch pipe 24 is provided so as to communicate with the body 21 so as to cross each of the first and second branch pipes 22 and 23 and the filter housing member 40 is detachably connected to the end. A portion 24a is formed. It is possible to further supply the injection liquid or the liquid through the third branch pipe (24).

The flow path switching member 30 has a flow body 31 inserted into the body 21 and rotatably installed therein and a rotary knob 33 connected to the upper portion of the flow body 31. 15A to 15C, a flow path 32 for selectively communicating the first to third branch pipes 22, 23 and 24 is formed in the flow path body 31. The flow path 32 has a main flow path 32a and a branch flow path 32b which communicate with each other. The main flow path 32a is formed in a straight line from one side of the flow path body 31 to the other side so that the first and second branch pipes 22 and 23 can communicate with each other. The branch passage 32b is connected to the main passage 32a in a direction crossing the main passage 32a and communicates with the third branch passage 24 according to the posture of the flow passage body 31 (Fig. 15B). 15A, all of the first and second branches 22, 23, and 24 can be communicated with each other, and as shown in FIG. 15B, 1 and the second branch pipes 22 and 23, or only the second and third branch pipes 23 and 24 may be communicated as shown in FIG. 15C.

Such a flow path body 31 is rotated in the body 21 so that at least two of the first to third branch pipes 22, 23 and 24 communicate with each other as shown in Figs. 15A to 15C, Can be blocked. A rotary knob 33 is connected to an upper portion of the body 31 so as to rotate the channel body 31. The rotary knob 33 may have a plurality of direction keys 33a, 33b and 33c arranged in a 'T' shape so as to correspond to a flow path 32 easily recognizable from the outside in the direction in which the flow path 32 is formed . Arrows are marked on the surfaces of the direction keys 33a, 33b, and 33c so that the user can easily operate the rotary knob 33 while confirming the direction of the flow path from the outside.

The filter housing member 40 is coupled to and detachably connected to any one of the first to third branch pipes 22, 23, 24, and is connected to the third branch pipe 24 in the embodiment of the present invention As an example.

Specifically, the filter housing member 40 has a cylindrical first coupling portion 41 formed at one end and coupled to the third branch pipe 24, and a second coupling portion 41 having a smaller diameter than the first coupling portion 41, And a cylindrical injection pipe 43 connected to the first coupling portion 41 and the coupling pipe 42. The coupling pipe 42 is inserted into and connected to the inside of the third branch pipe 23, ).

The first coupling portion 41 is screwed to the coupling portion 24a formed at the end of the third branch pipe 24 and connected to the coupling pipe 42 at the end thereof with different diameters. As shown in FIG. 14, the third branch pipe 24 is inserted and connected between the first coupling portion 41 and the coupling pipe 42.

The injection pipe 43 is extended from the connection part of the coupling part 41 and the connection pipe 42 by a predetermined length in a pipe shape and the second coupling part 44 is formed on the outer periphery of the end. The cap member 50 is coupled to the second engaging portion 44 so that the inlet of the injection tube 43 is blocked from the outside to prevent foreign matter from penetrating and the injector 43 is inserted into the syringe 60, the cap member 50 may be separated and used.

A filter (70) is installed in the injection tube (43). The filter 70 is formed of a resin material and can be manufactured by a sintering method. The filter 70 is inserted into the injection tube 43 in a so-called interference fit manner. Preferably, the filter 70 fitted to the inner circumferential surface 43a of the injection tube 43 is connected to the injection tube 43 by the suction pressure from the outside (suction pressure generated when blood is sampled using a syringe) A latching protrusion 44 is formed to protrude from the latching protrusion 44a.

A latching protrusion 44 for supporting the rim of the filter 70 is formed to protrude from the inner circumferential surface 43a inside the injection tube so as to prevent the filter 70 from falling out through the injection tube 43, At least one of the latching jaws 44 may be formed and a plurality of the latching jaws 44 may be formed at intervals corresponding to the thickness of the filter 70 to support both ends of the filter 70.

Preferably, the engaging protrusion 44 is formed continuously in the circumferential direction on the inner circumferential surface 43a of the injection tube 43, and the protruding height thereof gradually increases in the direction A in which the filter 70 enters for mounting To thereby guide the entry of the filter 70. [0052] As shown in FIG. When the filter 70 is forcedly engaged with the filter 70, the filter 70 is guided along the inclined surface 44a to pass through the engaging protrusion 44 and then the end of the filter 70 is brought into contact with the surface of the engaging jaw 44 opposite to the inclined surface 44a So that it is prevented from falling out due to the suction pressure of the syringe.

Further, unlike the membrane filter using resin, since the filter 70 is manufactured by sintering using a resin material, even if a negative pressure (a pressure for sucking blood by a syringe) is generated, deformation does not occur in the filter 70 So that the interval of the filter 70 does not change, and the initial filter performance can be maintained constantly.

Since the filter 70 is made of a resin material by sintering method, the filter 70 having the same material as that of the engaging jaw 44 formed of a resin material when the filter 70 is attached can be used as the engaging jaw 44 It can be coupled and stably fixedly installed without passing through the latching jaw 44. [ That is, in the case of a filter formed of a conventional metal material, when the filter is passed through the latching jaw 44, the latching jaw made of a resin material can be cut by a filter made of a metal. On the other hand, It is possible to securely fix the filter 70 and prevent the gap between the filter 70 and the inner circumferential surface of the injection tube from being generated.

According to the medical three-way valve 10 having the above-described configuration, the first cap member 25 is inserted into the first and second branch pipes 22 and 23 before use, And the second cap member 26 are connected to each other, and the third branch pipe 24 is connected to the filter demand member 40 to be kept closed.

11 and 15B, the first and second cap members 25 and 26 are separated, and the first and second branch pipes 22 and 23 ) To connect the fluid or water vessel. At this time, the flow path 32 is pivoted so as to connect only the first and second branch pipes 22 and 23, so that the third branch pipe 24 can be kept closed. And the filter housing member 40 is held in the third branch pipe 24 in a coupled state.

In this state, when injecting the injection liquid by using the third branch pipe 24, as shown in Figs. 12 and 15A, the flow path 32 is connected to the first to third branch pipes 22, 23, 24 After the cap member 50 of the filter housing member 40 is removed and the injection port 61 of the injector 60 is inserted into the injection tube 43, Can be injected. In this case, since the filter 70 is provided in the filter housing member 40, even if the injection liquid contains glass fragments or rubber debris, it can be filtered by the filter 70, .

Of course, the syringe 60 may be connected to the injection tube 43 as shown in FIG. 12 to be used for collecting the blood of the patient. In this case, the filter 70 can be prevented from being deformed by the negative pressure.

On the other hand, when the operator intends to further input the liquid through the third branch pipe 24, the filter housing member 40 is separated from the third branch pipe 24 as shown in FIG. 13, The liquid injection tube 82 can be directly connected to the third branch tube 24 by using the connector 81. [ Therefore, the liquid can be supplied to the patient by using the third branch tube 24 even at a low pressure without being disturbed by the filter 70.

In this way, the filter housing member 40 can be selectively connected to and separated from the third branch pipe 24, so that the infusion fluid or injection fluid is injected into the third branch pipe 24 in a state suitable for the respective conditions at the time of infusion of the infusion liquid and injection of the infusion liquid. So that it can be conveniently and safely used.

16, the configuration of the medical three-way valve 200 'having a configuration in which the third branch pipe 24' is connected to the first and second branch pipes 22, 23 in diagonal directions is also possible It is understood that the filter accommodating member 40 can be detachably connected to any of the branch pipes 24, and that the filter accommodating member 40 has the same structure.

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. Those skilled in the art will readily appreciate that many modifications and variations of the present invention are possible without departing from the spirit and scope of the appended claims.

10,10 '.. Medical three way valve 20 .. Valve body
30. A flow path switching member 40. A filter housing member
100 .. Filter Needle 70,140 .. Filter
200 .. Medical three way valve

Claims

A filter accommodating member having a through hole through which the injection liquid passes, the filter accommodating member being connectable to and detachable from the injecting portion or the medical three-way valve of the injector;
And a filter inserted and installed in the filter housing member and sintered and molded from a resin material,
Wherein the filter accommodating member is formed with a latching protrusion protruding from the inner surface of the filter accommodating member to support at least one edge of the filter.

The method according to claim 1,
Wherein the engaging jaw is formed continuously in the circumferential direction on the inner circumferential surface of the filter accommodating member and has an inclined surface for guiding the entry of the filter into the filter gradually increasing in a direction in which the filter is advanced for mounting, Medical drug infusion filter.

3. The method of claim 2,
A pair of the latching jaws are formed, and the filter is inserted and fixed between the pair of latching jaws.

The method according to claim 1,
Further comprising a support jaw for supporting the rim of the other surface of the filter protruded from the inner circumferential surface of the filter accommodating member so as to be caught by the engaging jaw.

5. The method according to any one of claims 1 to 4,
Wherein the filter-
A body having a space portion into which an injection portion of a syringe is inserted, the body being formed in the engagement protrusion;
And a suction part provided at one side of the body for coupling the injection needle.

5. The method according to any one of claims 1 to 4,
Wherein the filter-
A medical three-way valve having first to third branching branches branched so as to be communicated from a body, the branching passage being selectively connected or blocked by a flow-path switching member, wherein one of the first to third branching tubes Wherein the medicament-infusion filter is capable of being combined with the medical drug infusion filter.

The method according to claim 6,
Wherein the filter-
A cylindrical first coupling part formed at one end and coupled to any one of the first through third branch pipes;
A cylindrical coupling pipe inserted into a branch pipe having a smaller diameter than the first coupling unit and coupled with the first coupling unit and connected to the first coupling unit;
And an injection pipe extending in a cylindrical shape at a connection portion between the first engagement portion and the connection pipe and communicating with the connection pipe,
Wherein the filter is installed inside the injection tube.

And a cap member detachably coupled to an end of the filter housing member.