JPH08243149A - Filter supporting structure - Google Patents

Abstract

PURPOSE: To effectively make a filter provided with a hydrophobic part and a hydrophilic part function by providing a filter supporting structure with a communication path through which the housings formed on both planes of the filter communicate with each other, forming the hydrophilic part and the hydrophobic part in the filter and dividing the communication path into plural passages. CONSTITUTION: A medical filter structure 1 is provided with a sterilization filter 15, housings 13A, 13B formed on both planes of the filter 15 and a communication path 11 and a communication needle 19 through which the housings 13A, 13B communicate with each other. The sterilization filter 15 is a functional filter provided with the hydrophilic part and the hydrophobic part, and divides the communication part 11 and the communication needle 19 into the plural passages 12A, 12B, 20A and 20B. In this way, since the air passes the hydrophobic part of the filter in a reverse direction smoothly passing the passage other than the one through which solution passes, the solution on the communication path is prevented from blocking the flow of the air when it flows through the communication path.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a filter structure, and more particularly to a filter support structure having a filter through which a solution and air simultaneously pass and a medical filter support structure.

[0002]

2. Description of the Related Art Conventionally, a support structure for a filter has a structure in which the filter is supported on both sides by a housing made of a resin molded product or a support net including the housing, and the housing is connected for connecting to a cylinder or container for pressurization. A communication passage is formed. There are generally hydrophilic and hydrophobic filters, the hydrophilic filter is mainly used for filtering an aqueous solution, and the hydrophobic filter is mainly used for filtering gas.

Further, in a hydrophilic filter, once the aqueous solution has infiltrated, an air lock occurs and the filter cannot pass air at all. Therefore, when the aqueous solution flows from the pressurizing cylinder through the filter into the closed container or the like, the inside of the container becomes positive pressure as the liquid flows into the container, and the liquid may not be filtered smoothly. In particular, such inconvenience is observed when the solution is aseptically sent to the drug vial in the medical container in a sealed state. Therefore, conventionally, for the purpose of preventing airlock, a functional filter having a hydrophilic portion and a hydrophobic portion or a combination filter in which a hydrophilic filter member and a hydrophobic filter member are combined has been proposed. It is used to prevent an airlock during use.

[0004]

However, in the conventional filter support structure, if such a functional filter is used and the communication passage of the housing is thin, depending on the material and shape of the housing, the air may pass through simultaneously with the passage of the aqueous solution. May not flow back from the inside of the container to the filter against the direction of flow of the aqueous solution. If such air does not escape from the hydrophobic filter portion, the pressure inside the container is increased and the flow function of the filter is deteriorated. In particular, such inconvenience has become an important operational problem in medical containers. Therefore, an object of the present invention is to propose a filter support structure capable of sufficiently functioning a filter having a hydrophobic portion and a hydrophilic portion. Another object of the present invention is to provide a support structure for a medical filter that can rapidly sterilize a solution obtained by mixing a drug solution and a drug.

[0005]

SUMMARY OF THE INVENTION The present invention comprises a filter,
Housings formed on both sides of the filter, and communication passages that communicate with each other in the housings,
In a filter support structure including: a filter support structure, wherein the filter has a hydrophilic portion and a hydrophobic portion, and at least one of the communication passages is divided into a plurality of passages. By providing it, the said objective was achieved.

The present invention can be characterized in that the hydrophobic portion of the filter occupies 15 to 45% of the filter area. In the present invention, the filter may be a combination filter in which a hydrophilic filter and a hydrophobic filter are combined. .

In the present invention, the passage area of the communication passage may be (1/4) π2 ^{2 to} (1/4) π7 ² mm ² . In the present invention, a female connection portion whose inner diameter gradually decreases from the opening to the inner end of the communication passage or a male connection portion whose outer diameter increases from the opening end to the base end. Can be formed.

In the filter structure according to the present invention, a communication needle portion for piercing a sealing rubber stopper of a medicine container to be connected is formed at the tip of the communication passage, and a medical filter support structure is provided. The above object can be achieved by providing The present invention can also be characterized in that the hydrophobic portion of the filter is arranged at a position downstream from the hydrophilic portion as viewed from the drug container side.

[0009]

In the above filter supporting structure, as a normal operation, the aqueous solution flows from the inside of one housing through the hydrophilic portion of the filter into the container or the like. In this case, when the container or the like is a closed container, positive pressure is generated in the container due to the inflow of the solution. Therefore, the air in the container replaces the solution and tries to pass through the hydrophobic portion of the filter in the opposite direction to the passage direction of the solution. Then, in such a case, the connecting path of the housing is a plurality of passages, and the air smoothly passes through the hydrophobic portion of the filter in the opposite direction through the passages other than the passage through which the solution passes. Therefore, when the air flows through the communication passage, the solution in the communication passage does not block the air flow. Especially the diameter of the communication passage is 7
If it is less than or equal to mm, it is extremely likely to be blocked by the solution, so that the action of the return path largely functions.

In a medical infusion bag or the like, a drug solution which is connected to a drug container via a communicating needle or the like and is stored in the infusion bag or the like in a sterile state once flows into the drug container side, Return to infusion bag again. Therefore, a sterilization filter is used between the medicine container and the infusion bag for the purpose of sterilization. However, when the medical filter support structure is used for such a filter, even when the communication passage becomes an extremely elongated communication needle. The passage of the drug solution and the passage of the air work smoothly, and there is no possibility that the inside of the vial which is the drug container is positively pressurized and the solution does not easily flow in. Also, when returning the chemical solution,
The communication passage exerts such a function, and the mixing operation of the medicines can be performed easily and quickly.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of a medical filter support structure according to the present invention will be described in detail below with reference to the accompanying drawings.
1 is a front sectional view of a first embodiment of a medical filter support structure according to the present invention attached to a medical container, FIG. 2 (a).
3A and 3B are a plan view and a cross-sectional view of the sterilization filter of the first embodiment, and FIG. 3 is a cross-sectional view of a main part when the drug solution in the medical container is connected to the connected drug container by using the first embodiment. FIG. 4 is a cross-sectional view of essential parts when returning the drug solution from the connected drug container into the medical container of the first embodiment again.

As shown in FIGS. 1 to 4, the medical filter structure 1 according to the first embodiment of the present invention comprises a sterilizing filter 15
And a housing 13A, 13B formed on both sides of the filter 15, and a communication passage 11 and a communication needle 19 which are communicated in the housing 13A, 13B respectively. Further, as shown in FIG. 2, the sterilization filter 15 has a hydrophilic portion 15B and a hydrophobic portion 15B.
It is a functional filter having A, and the communication passage 11 and the communication needle 19 are divided into a plurality of passages 12A, 12B, 20A, 20B.

Medical filter support structure 1 according to the present embodiment
In more detail, the medical filter support structure 1 is attached to the medical container body 2 via the communication passage 11,
The container body 2 is made of an atypical and flexible resin container. Specifically, in this embodiment, the container body 2 is formed of a tube made of low density polyethylene by inflation molding. That is, the tube is cut into a predetermined length, and the upper and lower ends thereof are heat-sealed. Top 2A
Is manufactured by attaching a communication passage 11 of the medical filter support structure 1 to the lower end 2B and attaching a discharge port 4 to the lower end 2B. The container is not limited to the resin container, and a glass container or the like can be used.

The container body 2 is filled with the chemical solution 3 from the outlet 4, sealed with a rubber stopper 5, and then sterilized by autoclaving. The chemical liquid 3 is a basic liquid for infusion, and dissolves, dilutes, or mixes a drug 22 in a drug container 21 described later. Specifically, an amino acid solution, a basic solution for high-calorie infusion mainly containing glucose, physiological saline, 5% glucose solution, distilled water for injection, and a solution containing various electrolytes are used.

The discharge port 4 is made of a resin molding material and is liquid-tightly attached to the heat-sealed portion 2B of the container body 2.
The outlet 4 is closed by a rubber stopper 5 at its tip, and the rubber stopper 5 can be pierced by a communication needle for drip or the like. The communication passage 11 is a pipe-shaped resin molded product, and the heat-sealing portion 2 of the container body 2 is formed.
It is located at A and is attached liquid-tightly. One end of the communication passage 11 is connected to the housing 13A of the sterilization filter 15, and the other end is arranged inside the container body 2. In addition, the communication passage 11
The other end is closed and a cut is formed in the side peripheral wall thereof to form the easy-opening portion 11A. The easy-opening portion 11A prevents the chemical liquid 3 from entering the communication passage 11 during storage,
The inside of the communication passage 11 can be easily opened during use. Further, a partition 12 is formed in the communication passage 11,
There are two passages 12A in the communication passage 11 due to the partition 12.
12B is formed. In this embodiment, the communication passage 11 is a polypropylene molded product, but it is not limited to this, and other versatile resin may be used.

The sterilization filter 15 is provided with a pair of housing members 13A and 13B made of a resin molded product on both sides, and a support net (not shown) for supporting both sides of the sterilization filter 15. A pair of housings 13A, 1
3B is heat-fused by sandwiching the peripheral edge of the sterilization filter 15.
The inside of the lower housing 13A is connected to communicate with the above-mentioned communication passage 11, and the inside of the upper housing 13B is connected to the communication needle 19.

The sterilization filter 15 is a membrane filter, but it is a general screen type, depth type,
A general filter such as an anisotropy type can also be used. Further, the pore diameter of the membrane of the filter 15 is 0.6 μm or less,
Preferably 0.45 μm or less, more preferably 0.22
μm or less. If the pore size is within the above range, the passage of bacteria is almost completely prevented, and if 0.45 μm or less, toxic components such as bacterial debris can be removed, and if 0.22 μm or less, most toxic components such as debris are removed. You can.

As the sterilization filter 15, a functional filter having a hydrophilic portion 15B and a hydrophobic portion 15A is used, and in the present embodiment, polyvinylidene fluoride obtained by hydrophilizing the hydrophilic portion 15B is used. There is. The sterilization filter 15 is not limited to that of this embodiment, and for example,
Cellulose acetate, cellulose ester, cellulose nitrate, regenerated cellulose, and other cellulose-based membranes, nylon-based polyamide-based membranes, Teflon-based membranes made from fluorinated ethylene-based resin in powder or dispersion media, polystyrene, and phthalates. Examples thereof include a vinyl film made of an acid or the like, a polyolefin film obtained by melt extrusion of crystalline polypropylene or the like and rapid stretching, an acrylic film, a polycarbonate film, a vinylidene chloride film, and the like.

As shown in FIG. 2, the sterilization filter 15 has a hydrophobic portion 15A formed at the peripheral portion and a hydrophilic portion 15B formed at the central portion. The area of the hydrophobic portion 15A is preferably 15 to 45% of the total area, more preferably 20 to 35%. Hydrophobic part 15A
Within such a range, the flow of the aqueous solution is not affected, and the flow of air in the opposite direction can be sufficiently achieved. Further, the central portion of the sterilization filter 15 is arranged so as to project into the upper housing 13B, and the central portion is provided so as to be biased toward the side of the vial 21 which is a drug container.

A partition wall 20 that divides the passage into two is formed in the communication needle 19, and the partition wall 20 acts so as to form a passage for the chemical liquid 3 and an air passage (20A, 20B). The tip of the communication passage 19 has a rubber stopper 1 of the vial 21.
7 is formed with a communication needle portion 19A capable of communicating with a needle. Further, since the communication needle 19 has the communication needle portion 19A, it is not preferable that the diameter thereof is too large. On the other hand, considering the viscosity of the chemical liquid 3 and the liquid flow due to the surface tension, it is not preferable that the diameter is too small. For this reason, it is desirable that the diameter of the communication passage 19, that is, the passage area is (1/4) π2 ^{2 to} (1/4) π7 ² mm ² .

As shown in FIG. 3, the vial 21, which is a drug container used in this embodiment, is a glass container having a regularity. The drug 22 is filled in the vial 21,
The medicine 22 is aseptically filled from an outlet 18 having a rubber stopper 17. Drug 22 is a powdered anti-drug. However, in the present embodiment, the drug is not limited to powder and may be liquid. A specific liquid agent is glutamic acid, which is a type of amino acid. Particularly, when the aqueous solution of glutamic acid is heated to 100 ° C., it is partially converted into hirolidone and deteriorates, so that high-pressure steam sterilization cannot be performed. Drugs that cannot be sterilized in the state of an aqueous solution are also targeted.

Next, the use of the medical filter support structure 1 of this embodiment will be described with reference to FIGS. 3 and 4. First, as shown in FIG. 3, the container body 2 is turned over, the communication needle 19 is pierced by the rubber stopper 17 of the vial 21, and the interior of the vial 21 and the interior of the housing 13B are communicated with each other. Next, the easy-opening portion 11A of the communication passage 11 is broken off from the outside of the container body 2 to connect the inside of the container body 2 and the inside of the housing 13A. As a result, the chemical liquid 3 in the container main body 2 is transferred to the communication passage 11
Housing 1 through one passage 12A or 12B
It flows into 3A. The chemical solution that has flowed in passes through the central hydrophilic portion 15B of the sterilization filter 15 and flows into the housing 13B. The chemical liquid 3 in the housing 13B is the communication needle 1
The vial 2 through one passage 20A or 20B of 9
A predetermined amount quickly flows into 1. In this case, the drug solution 3 flows into the vial 21, so that the inside of the vial 21 is positively pressurized. Therefore, the air in the vial 21 acts so as to escape from the vial 21, and is discharged into the housing 13B through the passage 20A or 20B different from the passage of the drug solution 3 of the air communication needle 19. The air in the housing 13B passes through the hydrophobic portion 15A of the sterilization filter 15 and is discharged into the housing 13A. The air in the housing 13A has a passage 12A or 1 different from the passage of the chemical liquid 3 in the communication passage 11.
It is discharged into the container body 2 via 2B and eventually replaced with the chemical liquid 3.

Therefore, in the narrow communication passage 11 or the communication needle 19, there is no hindrance to the passage of air by the chemical liquid 3,
The drug solution 3 smoothly flows into the vial 21 without the vial 21 being positively pressurized. In addition, although the operation in the state where the drug solution 3 is naturally dropped has been described above, the same operation is performed even when the container body 2 is manually rubbed or the like to positively inject the drug solution 3 into the vial 21. That is, the inside of the container body 2 is repeatedly pressurized and atmospheric pressure by rubbing by hand, and the chemical liquid 3
Is positively sent into the vial 21, and when the inside of the container body 2 becomes normal pressure, the air in the vial 21 that has been positively pressurized by the inflow of the drug solution 3 passes into the container body 2 through the other passage described above. Then you can go back smoothly.

After the drug 22 and the drug solution 3 are sufficiently mixed in the vial 21, the container body 2 is inverted together with the vial 21 as shown in FIG.
Placed above. The drug solution 3 in the vial 21 again passes through the passage 20A or 20B of the communication needle 19 and flows into the housing 13B. The drug solution 3 that has flowed in passes through the central hydrophilic portion 15B of the sterilization filter 15 and returns to the inside of the housing 13A. The chemical liquid 3 in the housing 13A passes through the one passage 12A or 12B of the communication passage 11 and quickly returns to the inside of the container body 2. In this case, the drug solution 3 flows into the container body 2, so that the inside of the vial 21 becomes negative pressure. Therefore, the upper air in the container body 2 acts so as to rise, and the air is discharged into the housing 13A via the passage 12A or 12B different from the passage for the chemical liquid 3 in the communication passage 11. The air in the housing 13A passes through the hydrophobic portion 15A of the sterilization filter 15 and is discharged into the housing 13B. The air in the housing 13B passes through the passage 20A or 29B different from the passage for the liquid medicine 3 of the communication needle 19 and the vial 2
Discharge into 1.

Therefore, in the narrow communication passage 11 or the communication needle 19, there is no hindrance to the passage of air by the drug solution 3, so that the drug solution 3 returns smoothly into the container body 2 without negative pressure of the vial 21. . As a result, the drug 22 is aseptically introduced into the container body 2 and used for infusion or the like through the discharge port 4.

In the above description, the operation in the state where the chemical solution 3 is naturally dropped has been described. However, the operation for inflowing the chemical solution 3 into the container body 2 may be positively performed by rubbing the container body 2 by hand. . That is, the inside of the container main body 2 is repeatedly pressurized and atmospheric pressure by hand rubbing, etc., and the upper air in the main body 2 is positively sent into the vial 21 at the time of pressurization so that the internal pressure of the container main body 2 becomes normal. At some time, the inside of the vial 21 is positively pressurized by the inflow of air, and the drug solution 3 can smoothly return to the inside of the container body 2 through the above-mentioned another passage. As shown in FIG. 5, the sterilization filter 15 is arranged in a curved shape, and the hydrophobic portion 15A is located at a position downstream of the hydrophilic portion 15B when viewed from the vial 21 side, that is, when the chemical solution 3 is returned, the hydrophobic portion It is located higher than 15A. Therefore, when most of the liquid medicine 3 returns to the container body 2 side, a small amount of the liquid medicine 3 covers the hydrophobic portion 15A. Therefore, if the air is positively sent into the vial 21, the vial 21 will reach the state of the trace amount of the chemical solution 3.
A positive pressure can be maintained inside and inside the housing 13B. This makes it possible to extremely reduce the amount of liquid remaining in the housing 13B and expedite the end of the operation. If the hydrophobic part 15
When A is at a high position, air can freely flow in and out while leaving a large amount of the drug solution 3 in the housing 13B, so that the inside of the vial 21 cannot be positively positively pressed and the operation cannot be ended earlier. . In this embodiment, because the hydrophobic portion 15A of the sterilization filter 15 is formed on the periphery, the hydrophilic portion 15B is projected to the opposite side of the container body 2, but the hydrophobic portion 15A is formed in the central portion, The sterilization filter may be arranged by projecting the hydrophobic portion 15A toward the container body 2 side. From the above, the solution obtained by mixing the drug solution 3 and the drug 21 can be rapidly sterilized.

In the embodiment shown in FIG. 1, the form of the container body 2 is an infusion bag, but the form is not limited to this.
As shown in FIG. 3, the wall may be flexible and may be in the form of a resin bottle 25 that can be crushed to some extent. The resin bottle 25 is aseptically filled with a drug solution 26, and the outlet is sealed by a rubber stopper 27 capable of piercing a communicating needle. Further, a sleeve 28 is attached to the outlet of the resin bottle 25, the sleeve 28 maintains the sterility of the connecting needle portion 19A at the tip of the communicating needle 19, and the communicating needle portion 19A can be pushed in and moved. Therefore, the communication needle 19 is attached to both the housings 13A and 13B. Even with such a configuration, it has the same operation as the medical filter support structure 1 of the first embodiment, and is easily connected to the vial and the resin bottle 25, which are drug containers, to sufficiently exert its function. . In the embodiment shown in FIG. 1, the hydrophobic portion 1 of the sterilization filter 15 is
Although 5A is provided at the periphery, it may be provided at the center or may be randomly arranged with the hydrophilic portion. Furthermore, although the sterilization filter 15 is a functional filter, the sterilization filter 15 is not limited to this, and may be a combination filter in which a hydrophobic filter and a hydrophilic filter are separately provided in the communication passage.

Next, the filter support structure 30 of the second embodiment of the present invention will be described in detail with reference to FIGS. 7 and 8. 7 (a) and 7 (b) are sectional views of the second embodiment of the filter support structure according to the present invention, and FIG. 8 is a sectional view of the filter support structure of the second embodiment when in use.

The filter support structure 31 shown in FIGS. 7 and 8.
Is the filter 32 from both sides of the housing 33A, 3
A plurality of passages 34 are provided at the point supported by B and the connecting communication passages 34 and 35 integrally formed in the housings 33A and 33B.
The third embodiment is similar to the first embodiment in that A, 34B and the passages 35A, 35B are provided, but is different in the following points.

As shown in FIGS. 7 (a) and 7 (b), the housings 33A and 33B for supporting the filter 32 from both sides are made of resin molding, and the filter supporting surface has alternating peaks and valleys. The circular groove portions 40, 40 ... Are formed, and the radial groove portions 41, 41 ... Are formed so as to connect the circular groove portions 40, 40. The center where the radial groove portions 41 intersect with each other is the above-mentioned connecting communication passage 3
4 or 35 are in contact.

The connecting communication passage 34 formed integrally with the housing 33A has a female connecting portion 43 whose inner diameter gradually decreases from the opening 42 toward the inner side. Further, the connecting communication passage 35 integrally formed with the housing 33B is formed with a male connecting portion 45 whose outer diameter increases from the opening end 44 toward the base end. In addition, the filter 32 has a hydrophobic portion at the center and a hydrophilic portion at the periphery. Therefore, the hydrophobic portion is formed by each communicating portion 3 of the housing.
4, 35 are arranged so as to face the base end opening surfaces.

In such a structure, as shown in FIG. 8, the connecting communication passage 34 is connected to the drain port 47 of the industrial reaction tank 46.
Are connected via the female connector 43, and a closed container 48
By connecting the connection communication passage 35 to the intake port 49 of the filter via the male connecting portion 45, the filter supporting structure 4 can be industrially used.
1 is used. Therefore, the solution 50 in the reaction tank 46 is
It passes through one of the passages 34A or 34B of the connecting and communicating portion 34, passes through the radial groove portions 41 and the circular groove portion 40 in the housing 33A, and passes through the hydrophobic portion of the filter. The solution 50 that has flowed into the housing 33B has the circular groove portion 40 and the radial groove portion 4 of the housing 33B.
One passage 35A or 35B of the connection communicating portion 35 through
To flow into the sealed container 48. On the other hand, the closed container 48
The air passes through another passage 35A or 35B of the connection communication part 35 through which the solution 50 flows, and immediately passes smoothly through the hydrophobic portion at the center of the filter 32. Then, the air passes through another passage 34A of the connection communication portion 34 through which the solution 50 flows.
Alternatively, it is discharged to the reaction tank 46 through 34B. Therefore,
The solution 50 is filtered by the filter 32 and immediately filled in the closed container 49.

In each of the above-described embodiments, two passages are provided in the communication passage or the connecting / communication portion, but two or more passages may be formed as long as the same operational effect is exhibited.

[0034]

As described above, in the filter support structure according to the present invention, the filter has the hydrophilic portion and the hydrophobic portion, and at least one of the communicating passages is divided into a plurality of passages. Therefore, the functional filter and the like can be made to function sufficiently.

[Brief description of drawings]

FIG. 1 is a front sectional view of a first embodiment of a medical filter support structure according to the present invention attached to a medical container.

2A and 2B are a plan view and a cross-sectional view of a sterilization filter of the first embodiment.

FIG. 3 is a cross-sectional view of a main part when a drug solution in a medical container is connected to a connected drug container using the first embodiment.

FIG. 4 is a cross-sectional view when returning the drug solution from the connected drug container into the medical container of the first embodiment again.

5 is a cross-sectional view of a main part of the first embodiment shown in FIG.

FIG. 6 is a cross-sectional view using a resin bottle in the first embodiment.

7A and 7B are cross-sectional views of a second embodiment of the filter support structure according to the present invention.

FIG. 8 is a cross-sectional view of the filter support structure of the second embodiment when in use.

[Explanation of symbols]

 1 Medical Filter Support Structure 2 Container Main Body 3 Chemical Solution 4 Discharge Port 11 Communication Passage 12 Partition 12A, B Communication Passage 13A, B Housing 15 Filter 15A Hydrophobic Part 15B Hydrophilic Part 19 Communication Needle 20 Partition 20A, B Communication Passage Passage 21 Vial 22 Drug 31 Filter support structure 32 Filter 33 A, B Housing 34, 35 Communication passage 43 Female type connection part 45 Male type connection part

Claims (7)

[Claims] 1. A filter support structure comprising a filter, respective housings formed on both sides of the filter, and respective communication passages communicating with the respective housings, wherein the filter is a hydrophilic portion. And has a hydrophobic part,
At least one of the communication passages is divided into a plurality of passages. 2. The filter support structure according to claim 1, wherein the hydrophobic portion of the filter occupies 15 to 45% of the filter area. 3. The filter support structure according to claim 1, wherein the filter is a combination filter in which a hydrophilic filter and a hydrophobic filter are combined. 4. The passage area of the communication passage is (1/4) π.
The filter support structure according to any one of claims 1 to 3, wherein the filter support structure has a size of 2 ^{2 to} (1/4) π7 ² mm ² . 5. The female connecting portion having an inner diameter gradually decreasing from the opening to the inner end, or the male connecting portion having an outer diameter increasing from the opening end to the base end, at the tip of the communication passage. The filter support structure according to any one of claims 1 to 4, wherein a portion is formed. 6. The filter structure according to any one of claims 1 to 4, wherein a communication needle portion for piercing a sealing rubber stopper of a drug container to be connected is formed at a tip of the communication passage. A medical filter support structure characterized by: 7. The medical filter support structure according to claim 6, wherein the hydrophobic portion of the filter is arranged at a position downstream of the hydrophilic portion when viewed from the drug container side.