JP2009273515A - Filter device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a filter device capable of reducing the pressure loss in sucking or discharging a liquid. <P>SOLUTION: A male connection part 13 having a distal end opening to be connected to an injection needle and a female connection part 14 to be connected to an injection barrel are formed in either end of the filter device 11. A filter F1 having a liquid penetration hole 21 at the center is fixed in a storage space 20 formed inside a body part 12 to divide the storage space 20 into a male connection part 13 side section and a female connection part 14 side section. A movable body 25 is inserted into the liquid penetration hole 21. When the liquid is sucked into the injection barrel, the movable body 25 is moved to a permission position to permit passage of the liquid into the liquid penetration hole 21. When the liquid is discharged, the movable body 25 is moved to a blocking position to block the liquid penetration hole 21 and changes the pathway so that the liquid permeates the filter F1. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a filtering instrument that filters when sucked liquid is discharged.

Conventionally, drugs freeze-dried enclosed in ampoules and the like are dissolved in a liquid such as physiological saline, and inhaled into a syringe equipped with an injection needle and then administered to a patient, or injected into an infusion bag and infused. It is done to mix with the medicine in the bag. When the drug in the ampoule is dissolved with liquid, foreign substances are already mixed in the drug, or fine glass pieces are mixed into the drug when the ampule made of glass is opened with an opening device. There has been proposed an injection needle with a filter capable of inhaling and filtering a drug solution containing these foreign substances into an injection cylinder without replacing the injection needle (for example, Patent Documents 1 and 2). In Patent Document 1, a chemical liquid suction passage and a discharge passage for filtering the chemical liquid are formed separately. In Patent Document 2, an elastic member and a filter are arranged so as to overlap each other, bend from a support portion when a chemical solution is inhaled to form an inflow passage, and filter the chemical solution with a filter when discharging.
Utility model registration No. 3118219 Utility model registration No. 3119859

  However, in Patent Document 1, the interior of the housing is divided into two passages, and only half of each volume can be used when the chemical solution is inhaled and discharged. Moreover, in patent document 2, since a support part contacts the center part of a filter, the suction | inhalation and filtration (discharge) of a chemical | medical solution cannot be performed from the center part of a housing. For this reason, Patent Documents 1 and 2 have a problem in that pressure loss increases during suction and discharge, and pressure required for suction and discharge increases.

  The present invention has been made paying attention to such problems existing in the prior art, and an object of the present invention is to provide a filtration instrument that can reduce pressure loss during inhalation or discharge. is there.

  In order to solve the above-described problems, the invention according to claim 1 is directed to discharging the liquid sucked from the opening into the housing having the opening through which the liquid is sucked and discharged. In the filtration device in which a filter for removing foreign substances is arranged, an inside of the housing is a suction passage through which the liquid passes when the liquid is sucked, and the filter is arranged so that the liquid is filtered by the filter when the liquid is discharged. And a switching means for switching the passage through which the liquid passes during the suction and the discharge, and surrounds one of the suction passage and the discharge passage outside the other passage. The gist is that one passage is arranged inside the other passage.

  According to this, for example, when a syringe or a liquid transport device is connected to the housing and either one of the liquid suction and discharge operations is performed, the other (inside) disposed so as to be surrounded by one passage The liquid passes through the passage. In general, when a liquid is passed through a housing, it is known that the pressure loss increases as the position where the liquid passes away from the central portion, and the pressure required for sucking and discharging the liquid increases. For this reason, it is possible to reduce pressure loss when performing either one of liquid suction and discharge. Further, without removing the filtration device from the syringe barrel or the like, the liquid containing the foreign matter can be sucked into the syringe barrel or the like without being filtered and discharged while being filtered by the filter.

  According to a second aspect of the present invention, in the filtration instrument according to the first aspect, the switching means is in a permissible state that allows the liquid to pass through the suction passage during the inhalation, and the discharge means The gist is to move by receiving the liquid pressure of the liquid by a pressure receiving surface formed in the switching means and block the suction passage so that the liquid does not pass through the suction passage.

  According to this, at the time of inhalation, the liquid passes through the suction passage, while at the time of discharge, the switching means closes the suction passage by the liquid pressure of the liquid, and the passage through which the liquid passes is switched to the discharge passage. For this reason, it is not necessary to separately provide an operation mechanism for operating the switching means so as to switch the passage during inhalation and during ejection.

  According to a third aspect of the present invention, in the filtration device according to the second aspect, the filter is disposed so as to partition the opening side and the opposite side inside the housing, and the suction passage is Including a liquid passage hole formed in the filter, the discharge passage including the filter disposed around the liquid passage hole and allowing the liquid to pass therethrough, and the switching unit includes The gist is that the movable body is located at a permissible position where the liquid passage hole is opened and is in the permissible state, and is movable to a position where the liquid passage hole is closed during the ejection.

  According to this, at the time of inhalation, the liquid passes through the liquid passage hole formed in the filter, while at the time of discharge, the liquid passage hole is blocked by the movable body, so that the filter disposed around the liquid passage hole is removed. Liquid passes through. For this reason, the pressure loss at the time of inhalation can be reduced.

  According to a fourth aspect of the present invention, there is provided the filtration device according to the second aspect, wherein the suction passage is formed between the filter and the inner wall surface that are spaced apart from the inner wall surface inside the housing. The discharge passage includes the filter through which the liquid can pass during the discharge and is in a position in contact with the inner wall surface, and the switching means forms the liquid passage and The gist of the invention is that the filter is movable between a permissible position in a permissible state and a closed position that contacts the inner wall surface and closes the liquid passage.

  According to this, at the time of inhalation, the liquid passes through a liquid passage formed around the filter, while at the time of discharge, the liquid passage is blocked by the filter. pass. For this reason, the pressure loss at the time of discharge can be reduced.

  According to the present invention, it is possible to reduce pressure loss during inhalation or ejection.

(First embodiment)
Hereinafter, a first embodiment of the present invention will be described with reference to FIGS.
As shown in FIG. 1, the filtration device 11 of the present embodiment includes a main body portion 12 formed in a substantially annular shape, a substantially cylindrical male connection portion 13 and a female shape from both opposing surfaces of the main body portion 12. Each of the connecting portions 14 is formed so as to protrude to form a housing 11a. The entire filtration device 11 is made of a plastic material (for example, polypropylene, polyethylene, polycarbonate, acrylic resin, etc.). The filtration device 11 may be sealed in a predetermined sterilization bag and sterilized (for example, EOG sterilization, high-pressure steam sterilization, radiation sterilization, etc.).

  First, the male side member 15 which comprises the housing 11a and has the male type connection part 13 is demonstrated. The male side member 15 includes a male connection portion 13 and a substantially annular lid portion 16 that is connected to the base end portion of the male connection portion 13. The outer peripheral surface of the male connection portion 13 has a tapered structure in which the diameter is reduced from the proximal end portion toward the distal end portion so as to satisfy a predetermined connection standard (for example, JIS, ISO), and injection (not shown) The needle can be connected. As shown in FIG. 2A, a plurality of (for example, twelve) support rib portions 15c are provided on the bottom surface 15d of the lid portion 16 opposite to the surface on which the male connection portion 13 is disposed. The portions 16 are arranged radially from the inner peripheral surface toward the center. The support rib part 15c is arrange | positioned so that the inner periphery of the cover part 16 may be equally divided | segmented in the circumferential direction. Further, as shown in FIG. 1, a liquid passage 15a having a circular shape in cross section is opened at the center of the bottom surface 15d so as to communicate the bottom surface 15d and the distal end surface of the male connection portion 13. Similarly, a distal end opening K of the liquid passage 15 a is formed on the distal end surface of the male connection portion 13. Further, the liquid passage 15a is provided with a straight portion 15b in which the diameter of the liquid passage 15a does not change by a predetermined length from the opening position on the bottom surface 15d side of the lid portion 16 toward the male connection portion 13 side. ing.

  Next, the female side member 17 which has the female type connection part 14 and comprises the housing 11a with the male side member 15 is demonstrated. The female side member 17 includes a female connection portion 14, a substantially annular bottom plate portion 18 connected to the base end portion of the female connection portion 14, and the female connection portion 14 from the peripheral portion of the bottom plate portion 18. Consists of a side wall 19 extending to the opposite side. The inner peripheral surface of the substantially cylindrical female connection portion 14 has a tapered structure in which the diameter is increased from the base end portion toward the tip end portion so as to satisfy a predetermined connection standard (for example, JIS, ISO). A syringe barrel (not shown) can be connected. In addition, the lock structure of the front-end | tip part of the female type connection part 14 is abbreviate | omitted. In addition, a smooth clamping portion 18 a is formed adjacent to the side wall portion 19 and concentrically with the bottom plate portion 18 on the surface of the bottom plate portion 18 opposite to the surface on which the female connection portion 14 is disposed. Yes. In the center of the bottom plate portion 18, a liquid passage 18 b having a substantially circular cross-sectional view that communicates the sandwiching portion 18 a and the distal end surface of the female connection portion 14 is opened. The inner peripheral surface of the female connection portion 14 forms a part of the liquid passage 18b.

  A plurality (for example, three) of sliding rib portions 18c extending from the opening on the clamping portion 18a side toward the female connection portion 14 side are provided on the inner peripheral surface of the bottom plate portion 18 toward the center of the liquid passage 18b. The protrusion is formed. The sliding rib part 18c is arrange | positioned so that the circumferential direction of the liquid flow path 18b may be divided | segmented equally. Between the sliding rib portions 18c, a rib-to-rib passage 18e through which liquid passes is formed. Further, a support portion 18d is formed at the end of the sliding rib portion 18c on the female connection portion 14 side so as to protrude from the position coinciding with the sliding rib portion 18c toward the center of the bottom plate portion 18. .

  The filtration device 11 of this embodiment is welded by ultrasonic waves in a state where the lid portion 16 of the male side member 15 and the side wall portion 19 of the female side member 17 are aligned and matched in a side view to form a housing 11a. ing. A housing space 20 in which the filter F <b> 1 is housed is formed in the housing 11 a from the male side member 15, the bottom plate part 18 (clamping part 18 a) of the female side member 17, and the side wall part 19.

  As shown in FIG. 4, the filter F <b> 1 is formed of a porous body (for example, polypropylene, polyethylene, polytetrafluoroethylene, etc.) formed in a circular ring shape in a side view. In addition, a circular liquid passage hole 21 penetrating both surfaces of the filter F1 is formed in the approximate center in the side view of the filter F1. On the inner peripheral surface of the liquid passage hole 21, a film layer 21 a that does not allow liquid to pass in both directions from the liquid passage hole 21 to the filter F <b> 1 and from the filter F <b> 1 to the liquid passage hole 21 is formed. The diameter of the liquid passage hole 21 is substantially the same as the inner diameter of the straight portion 15 b of the male side member 15. The filter F <b> 1 is sandwiched between the support rib portion 15 c of the male side member 15 and the sandwiching portion 18 a of the female side member 17 and is fixed in the accommodation space 20. Further, the outer diameter of the filter F1 is formed slightly larger than the inner diameter of the side wall portion 19 of the female side member 17, and the filter F1 is inserted (press-fitted) into the side wall portion 19 with the outer peripheral surface of the filter F1. The inner peripheral surface of the side wall portion 19 is in close contact. That is, the filter F1 is fixed so as to partition the housing space 20 into a male connection portion 13 (tip opening K) side and a female connection portion 14 side.

  A movable body (switching means) 25 that slides in the liquid passage hole 21 by a liquid passing through the inside of the filtration instrument 11 is inserted into the liquid passage hole 21 of the filter F1. As shown in FIG. 3, the movable body 25 includes a sealing portion 26 formed in a substantially disk shape, and a cylindrical switching portion 27 formed so as to protrude from the sealing portion 26. The outer diameter of the sealing portion 26 is slightly smaller than the diameter of the inscribed circle of the sliding rib portion 18c. In addition, the outer diameter of the sealing portion 26 is set to a size corresponding to the inner diameter of the female connection portion 14 on the proximal end side. In addition, the sealing portion 26 is provided with a conical portion 26a that protrudes in a conical shape toward the switching portion 27 side. A surface of the conical portion 26a on the male connection portion 13 side is a pressure receiving surface 26b that receives the liquid pressure of the liquid. Further, a mortar-shaped pressure receiving surface 26c is formed on the surface of the conical portion 26a on the female connection portion 14 side. A pair of liquid passing windows 27 a are formed on the side surface of the base end portion of the switching unit 27 so as to communicate the outside and the inside of the switching unit 27. As shown in FIG. 4, the outer diameter of the switching part 27 is formed slightly smaller than the diameter of the liquid passage hole 21 of the filter F1 and the inner diameter of the straight part 15b.

  Further, as shown in FIG. 4A, the length of the switching portion 27 is such that the movable body 25 is located at a position where the sealing portion 26 contacts the support portion 18d (hereinafter referred to as “allowable position”). In addition, the length of the front end side of the switching unit 27 is set to be inserted into (appears to) the liquid passage hole 21 and the straight portion 15b of the filter F1. At the permissible position, a part of the liquid passage window 27a is exposed from the filter F1 to the internal space of the female connection portion 14. At the permissible position, the gap between the filter F1 formed by the support rib portion 15c and the bottom surface 15d is covered with a portion of the switching portion 27 where the liquid passage window 27a is not formed, and is not communicated with the liquid passage 15a. It has become. At the permissible position, the movable body 25 is in contact with the support portion 18d and is restricted from moving toward the female connection portion 14 side.

  Further, as shown in FIG. 4B, the movable body 25 has a position where the sealing portion 26 of the movable body 25 abuts against the opening end portion of the liquid passage hole 21 of the filter F1 (hereinafter referred to as “closed position”). ), The liquid flow window 27a is accommodated in the liquid flow hole 21 so as not to be exposed in the internal space on the female connection part 14 side. For this reason, the movable body 25 is configured to close the liquid passage hole 21 at the closed position. In the closed position, the liquid flow window 27a of the movable body 25 is positioned so that the clearance between the filter F1 and the bottom surface 15d and the liquid flow path 15a communicate with each other. That is, the length of the liquid passing window 27a along the protruding direction of the switching unit 27 is set to be longer than the thickness of the filter F1 by the height of the support rib portion 15c. The movable body 25 has a liquid passage hole 21 (inner circumference) of the filter F1 between the allowable position and the closed position by a guide mechanism formed by the straight portion 15b, the liquid passage hole 21, and the sliding rib portion 18c. Surface) is slidably guided. Moreover, in the filtration instrument 11 comprised as mentioned above, it forms so that the center of the male side member 15, the filter F1, the movable body 25, and the female side member 17 may be located on the same line. For this reason, the movable body 25 is guided by the guide mechanism so as to slide on the center line of the filter F1. In the following description, the movement of the movable body 25 to the allowable position side may be referred to as “retreat” and the movement to the closed position side may be referred to as “forward”.

  Next, the effect | action is demonstrated based on FIG. 4 about the filtration instrument 11 of 1st Embodiment comprised as mentioned above. In the following description, it is assumed that a syringe needle (not shown) is connected to the male connection portion 13 and a syringe cylinder (not shown) is connected to the female connection portion 14.

  As shown in FIG. 4A, when a liquid (medical solution) containing a foreign substance is sucked into the liquid passage 15a from the tip opening K through the injection needle by operating the plunger of the syringe barrel, the movable body 25 is The surface of the conical portion 26a acts as a pressure receiving surface 26b that receives the liquid pressure when the liquid is sucked, whereby the conical portion 26a is retracted to the allowable position. In this state, the liquid that has flowed into the switching unit 27 from the male connection part 13 (fluid passage 15a) passes through the liquid passage window 27a exposed from the inner peripheral surface (fluid hole 21) of the filter F1. At the same time, it flows into the inter-rib passage 18e between the sliding rib portions 18c (indicated by the arrow Y1). Further, the liquid flowing into the inter-rib passage 18e passes through the side of the sealing portion 26, passes through the inside of the female connection portion 14 (liquid passage 18b), and is sucked into the syringe barrel (indicated by the arrow Y2). Show). In this state, the gap between the bottom surface 15d and the filter F1 is covered by the switching unit 27, and the inflow of liquid containing foreign matter into the gap is suppressed. Moreover, since the film layer 21a which does not allow liquid to pass through is formed on the inner peripheral surface of the liquid passing hole 21, the liquid passes through the liquid passing window 27a without passing through the filter F1. In this state, the suction passage that communicates from the distal end opening K of the male connection portion 13 to the opening at the distal end of the female connection portion 14 through the center (fluid hole 21) of the filter F1 passes through the filtration instrument 11. Is formed. That is, at the time of inhaling the liquid, a path through which the liquid passes without passing through the filter F1 is formed in the filtration instrument 11.

  Next, as shown in FIG. 4B, when the liquid sucked into the syringe barrel is pushed out into the female connector 14 (fluid passage 18b) by the operation of the plunger of the syringe barrel, the movable body 25 is The surface of the conical portion 26a acts as a pressure receiving surface 26c that receives the liquid pressure during the liquid discharge, whereby the conical portion 26a is advanced to the closed position. The liquid passage hole 21 of the filter F1 is closed by the movable body 25. In this state, the liquid pushed out to the liquid passage 18b is dispersed on the pressure receiving surface 26c and flows into the inter-rib passage 18e between the sliding rib portions 18c (shown by an arrow Y3). Then, the liquid that has flowed into the inter-rib passage 18e passes through the filter F1 and is switched from the gap between the filter F1 and the bottom surface 15d through the liquid passage window 27a exposed on the male connection portion 13 side of the filter F1. It flows into the inside of the portion 27 and further flows out to the liquid passage 15a on the male connection portion 13 side (indicated by an arrow Y4). Then, the liquid that has been filtered by the filter F <b> 1 and from which foreign matter has been removed is discharged (outflowed) from the distal end opening K (the distal end of the injection needle) of the male connection portion 13. In this state, the filtration device 11 communicates from the opening at the tip of the female connection portion 14 to the tip opening K of the male connection portion 13 through the filter F1 disposed around the liquid passage hole 21. A discharge passage is formed. That is, at the time of discharge, a path through which the liquid passes through the filter device 11 while being filtered by the filter F1 is formed. As described above, the movable body 25 according to the present embodiment slides (moves) between the permissible position and the closed position, so that the passage through which the liquid passes at the time of inhalation and at the time of ejection is discharged from the suction passage. It is designed to switch between passages.

Therefore, according to the present embodiment, the following effects can be obtained.
(1) At the time of inhaling the liquid, the liquid passes through the liquid passage hole 21 formed in the center (inner side) of the filter F1, while at the time of discharging the liquid, the liquid is disposed around the liquid passage hole 21. It passes through the filtered filter F1. For this reason, the pressure loss at the time of inhaling a liquid with a syringe can be reduced.

  (2) The movable body 25 is slid between the allowable position and the closed position to switch the passage through which the liquid passes. For this reason, even if the filtration instrument 11 is not removed from the syringe barrel, the liquid containing the foreign matter is sucked into the syringe barrel without being filtered, and filtered through the filter F1, and the distal end opening K of the male connection portion 13 is filtered. It can be discharged from (the tip of the injection needle).

  (3) Pressure receiving surfaces 26b and 26c for receiving the liquid pressure of the liquid at the time of sucking and discharging the liquid are provided. Therefore, at the time of inhalation, the movable body 25 is moved to the permissible position by the pressure receiving surface 26b receiving the liquid pressure of the liquid to be inhaled. Further, at the time of discharge, the movable body 25 receives the liquid pressure of the liquid pushed out from the syringe barrel and is moved to the restriction position. For this reason, the movable body 25 is moved by the liquid pressure of the liquid passing through the storage space 20, and the passage through which the liquid passes is switched during suction and discharge. Therefore, it is not necessary to separately provide an operation mechanism that is operated by the user to switch the passages when sucking and discharging the liquid.

  (4) The movable body 25 is slidably guided through the liquid passage hole 21 (inner peripheral surface) of the filter F1 by a guide mechanism formed by the straight portion 15b, the liquid passage hole 21, and the sliding rib portion 18c. The For this reason, it can suppress that a clearance gap arises between the sealing part 26 and the opening edge part of the filter F1, and a sealing performance falls because the movable body 25 inclines in a closed position. That is, it is possible to prevent the liquid containing the foreign substance sucked into the syringe barrel from being discharged from the distal end opening K (the distal end of the injection needle) of the male connection portion 13 without being filtered by the filter F1.

  (5) The support rib portion 15c of the filter F1 is provided on the bottom surface 15d. For this reason, when filtering a liquid, it can control that filter F1 sticks to bottom 15d by the liquid pressure of a liquid. In general, when the filter F1 is in close contact with the inner wall surface of the accommodating space 20 of the main body 12, the liquid filtration efficiency is significantly reduced in the close contact portion. Therefore, it can suppress that the efficiency of filtration by filter F1 falls.

  (6) In the allowable position, the switching unit 27 of the movable body 25 covers the gap between the bottom surface 15d and the filter F1, while in the closed position, the liquid passing window 27a is positioned so as to correspond to the gap and the switching unit 27 is The gap was not covered. For this reason, it is possible to prevent the liquid containing foreign matter from flowing into the gap between the bottom surface 15d and the filter F1 when the liquid is sucked, and to allow the liquid to pass through the gap to the inside of the switching unit 27 during the discharge. . As a result, the liquid containing the foreign matter is prevented from staying in the gap (between the support ribs 15c) between the bottom surface 15d and the filter F1 when the liquid is sucked, and the liquid necessary for the purge performed when the liquid is discharged is prevented. The amount can be reduced. And it can suppress that a foreign material mixes in the liquid after filtration discharged from the male type | mold connection part 13 again. Moreover, it can suppress that the filter F1 is contaminated with a foreign material by suppressing that the liquid containing a foreign material contacts the surface of the filter F1 arrange | positioned at the male type connection part 13 side.

  (7) The conical part 26 a is provided in the sealing part 26. For this reason, when the liquid is sucked, the flow of the liquid can be rectified so that the liquid that has flowed into the switching unit 27 flows out from the liquid window 27a.

  (8) The outer diameter of the sealing portion 26 is formed substantially the same as the inner diameter of the liquid passage 18b, and a pressure receiving surface 26c is provided. For this reason, the liquid pressure of the liquid pushed out by the syringe barrel does not easily escape to the surroundings, and the movable body 25 can be reliably advanced to the closed position and the filter F1 and the sealing portion 26 can be brought into close contact with each other.

(9) A film layer 21 a was formed on the inner peripheral surface of the liquid passage hole 21. For this reason, at the time of inhaling the liquid, the liquid enters the filter F1 from the inner peripheral surface of the liquid passage hole 21 and escapes between the sliding rib portions 18c, thereby filtering the liquid with the filter F1. And the contamination of the filter F1 by foreign matter can be suppressed. When the liquid is discharged, the liquid that has entered the filter F1 from the surface on the female connection portion 14 side of the filter F1 is not pushed out from the inner peripheral surface of the liquid passage hole 21, and is all on the opposite side (male connection). Extruded from the surface of the portion 13 side). For this reason, it is avoided that filtration efficiency falls by the distance through which the liquid passes the inside of filter F1 becoming short.
(Second Embodiment)
Next, a second embodiment of the present invention will be described with reference to FIGS. In the following description, the same reference numerals are given to the same configurations as those of the already described embodiments, and the overlapping description is omitted and simplified.

  In the liquid flow path 15a of the present embodiment, a rectifying section 28 is formed that rectifies the liquid flowing from the tip opening K of the male connection section 13 so as to flow along the inner wall surface of the liquid flow path 15a. . The rectifying unit 28 is connected to and supports a cylindrical columnar part 28a disposed on the center line of the male connection part 13 and the cylindrical part 28a and the inner peripheral surface of the male connection part 13 (for example, 3) support portions 28b. 18 d of support parts are arrange | positioned so that the circumferential direction of the liquid flow path 15a may be divided | segmented equally. The lid 16 is not provided with a bottom surface 15d, but instead is provided with a tapered portion 29 which is connected to the opening of the liquid passage 15a and is formed so as to be expanded from the opening. .

  Further, the female side member 17 is not provided with the bottom plate portion 18, and a side wall portion 19 formed in an annular shape with respect to the proximal end portion of the female connection portion 14 is continuously provided. In addition, a holding portion 30 formed in a cylindrical shape is disposed at the side view center of the side wall portion 19. The holding part 30 is formed with a liquid passage 30a that penetrates both end faces of the female connection part 14 side and the accommodation space 20 side. The holding part 30 is supported by a plurality of support parts 30 b that connect the holding part 30 and the inner peripheral surface of the side wall part 19. The support part 30b is arrange | positioned so that the inner periphery of the side wall part 19 may be equally divided | segmented in the circumferential direction. In addition, the holding | maintenance part 30 is arrange | positioned so that it may be located in the center also with respect to the liquid flow path 18b. As shown in FIG. 6, a plurality of (for example, three) holding ribs 30 c extending from the connecting portion with the support portion 30 b toward the accommodation space 20 side are formed on the outer peripheral surface of the holding portion 30. .

  Next, the filter F2 accommodated in the accommodation space 20 of this embodiment is demonstrated. The filter F2 of the present embodiment is a porous sintered body made of a plastic material (for example, polypropylene, polyethylene, etc.). As shown in FIG. 7, the filter F2 includes a bag-shaped portion 31 having a bag-shaped tip, a seal portion 32 having a taper structure with a diameter increased from the opening end of the bag-shaped portion 31, and the seal It consists of a cylindrical skirt portion 33 provided continuously with the open end of the portion 32, and the whole is formed in a substantially bottomed cylindrical shape. The taper angle of the seal portion 32 is an angle corresponding to (parallel to) the taper portion 29 formed on the male side member 15. Further, the inner diameter of the skirt portion 33 is formed to be substantially the same as the outer diameter of the holding portion 30 of the male side member 15, and is slightly smaller than the diameter of the circumscribed circle of the holding rib 30c. For this reason, when the skirt portion 33 is inserted into the holding portion 30, the skirt portion 33 is slightly press-fitted by the holding rib 30 c, and the filter F 2 is held by the holding portion 30. The press-fitted state of the filter F2 into the holding unit 30 is easily released by applying a hydraulic pressure from the skirt 33 side. And the filter F2 is arrange | positioned in the accommodation space 20 in the planar view substantially center in the state hold | maintained at the holding | maintenance part 30. Further, the outer diameter of the skirt portion 33 is formed substantially the same as the inner diameter of the liquid passage 18b. The opening end surface of the filter F2 (skirt portion 33) is a pressure receiving surface 33a that receives the liquid pressure of the liquid flowing from the female side member 17.

  As shown in FIG. 8A, the length of the filter F2 is such that when the skirt portion 33 is slightly pressed and held at the holding portion 30 (allowable position), the bag-like portion 31 has a liquid passage. It is formed in a length that is inserted into (facing) 15a. At the permissible position, the filter F2 is formed so as to form a liquid passage 35 through which liquid passes while being separated from the inner wall surface of the accommodating space 20 composed of the liquid passage 15a, the tapered portion 29, and the side wall portion 19. It has become. In addition, before use of the filtration instrument 11, the filter F2 is arrange | positioned in the permissible position.

  Further, as shown in FIG. 8B, the length of the skirt portion 33 of the filter F2 is in a position (closed position) where the seal portion 32 of the filter F2 and the taper portion 29 of the male side member 15 come into contact with each other. The holding portion 30 is formed to have a length that faces the inside of the skirt portion 33. That is, the locked state between the holding portion 30 and the skirt portion 33 is maintained at the closed position. In the closed position, the filter F2 is configured such that the seal portion 32 comes into contact with the tapered portion 29 and the liquid passage 35 is closed.

Next, the effect | action is demonstrated based on FIG. 8 about the filtration instrument 11 of 2nd Embodiment comprised as mentioned above.
As shown in FIG. 8A, when a liquid containing a foreign substance flows into the liquid passage 15a, the liquid is dispersed by the cylindrical portion 28a of the rectifying portion 28 and passes between the support portions 30b. Thus, the flow is rectified into a flow along the inner wall surface of the liquid passage 15a (indicated by an arrow Y5). Then, the liquid passes through the liquid passage 35, passes through the inside of the female connector 14 (fluid passage 18b), and is sucked into the syringe barrel (indicated by an arrow Y6). That is, in this state, suction that communicates with the filtration device 11 from the tip opening K of the male connection portion 13 to the opening at the tip of the female connection portion 14 through the periphery of the filter F2 (fluid passage 35). A passage is formed.

  Next, as shown in FIG. 8B, when the liquid sucked into the syringe barrel is pushed out into the female connection part 14 (fluid passage 18 b), the filter F <b> 2 is passed through the liquid passage 30 a of the holding part 30. The liquid that has flowed into the bag-like portion 31 and the liquid pressure received by the pressure-receiving surface 33a are advanced to the closed position. In the filter F <b> 2, the seal portion 32 comes into contact with the tapered portion 29 to close the liquid passage 35. At this time, the filter F2 is guided by the holding unit 30 so as to advance straight from the allowable position to the closed position. In this state, the liquid that has flowed into the liquid flow path 18b passes through the liquid flow path 30a of the holding part 30 and flows into the bag-shaped part 31, and also passes through the filter F2 (shown by arrows Y7 and Y8). ). Then, the liquid from which the foreign matter has been removed by passing through the filter F2 is discharged (outflowed) from the tip opening K (the tip of the injection needle) of the male connection portion 13 (shown by an arrow Y9). In this state, the filtration device 11 discharges from the opening at the tip of the female connection portion 14 to the tip opening K of the male connection portion 13 through the liquid passage 30a of the holding portion 30 and the filter F2. A passage is formed. As described above, the filter F2 according to the present embodiment moves from the permissible position to the closed position, thereby switching the passage through which the liquid passes between the suction passage and the discharge passage during suction and discharge. It is supposed to function as well.

Therefore, according to the second embodiment, the following effects can be obtained.
(10) At the time of inhaling the liquid, the liquid passes through the liquid passage 35 around the filter F2 disposed at the center, while at the time of discharging the liquid, the liquid is disposed at the liquid passage 30a disposed at the center. It passes through the filter F2. For this reason, the pressure loss at the time of discharging a liquid with a syringe can be reduced.

  (11) The filter F2 is moved from the permissible position to the closed position to switch the passage through which the liquid passes. For this reason, even if the filtration instrument 11 is not removed from the syringe barrel, the liquid containing the foreign matter is sucked into the syringe barrel without being filtered, and is filtered through the filter F2, and the distal end opening K of the male connection portion 13 is filtered. It can be discharged from (the tip of the injection needle).

  (12) A pressure receiving surface 33a for receiving the liquid pressure when the liquid is discharged is provided. For this reason, at the time of discharge, the filter F2 receives the liquid pressure of the liquid pushed out from the syringe barrel and is moved to the restriction position. For this reason, the filter F2 is moved by the liquid pressure of the liquid passing through the storage space 20, and the passage through which the liquid passes is switched during suction and discharge. Therefore, it is not necessary to separately provide an operation mechanism that is operated by the user to switch the passages when sucking and discharging the liquid.

  (13) The filter F2 is a sintered body and the holding unit 30 guides the forward movement of the filter F2. For this reason, it can suppress that a clearance gap produces between the taper part 29 and the seal | sticker part 32 because the filter F2 inclines in a closed position, and a sealing performance falls. That is, it is possible to prevent the liquid containing the foreign substance sucked into the syringe barrel from being discharged from the distal end opening K (the distal end of the injection needle) of the male connection portion 13 without being filtered by the filter F2.

(14) The filter F <b> 2 was formed in a substantially bottomed cylindrical shape having the bag-like portion 31. For this reason, the filtration area of filter F2 can be enlarged and filtration efficiency can be improved.
(15) The outer diameter of the skirt portion 33 is formed substantially the same as the inner diameter of the liquid passage 18b, and a pressure receiving surface 33a is provided. For this reason, the liquid pressure of the liquid pushed out by the syringe barrel does not easily escape to the surroundings, and the filter F2 can be reliably advanced to the closed position.

(16) The rectifying unit 28 is provided in the liquid passage 15a. For this reason, it can suppress that the filter F2 is contaminated by receiving the liquid containing a foreign material with the filter F2 directly. Further, by rectifying the flow along the periphery of the liquid passage 15a, the liquid can easily flow to the side (the liquid passage 35) of the filter F2 at the allowable position.
(Third embodiment)
Next, a third embodiment of the present invention will be described with reference to FIG. In addition, the filtration instrument 11 of 3rd Embodiment is made the same as 2nd Embodiment except the part demonstrated below.

  A filter F3 formed in a substantially cylindrical shape with a bottom is fixed to the opening of the holding portion 30 on the male connection portion 13 side. The filter F3 is a porous sintered body as in the second embodiment. A substantially disc-shaped switching valve member 36 is fixed to the surface of the filter F3 on the male connection portion 13 side. The switching valve member 36 is made of an elastic body (for example, silicon rubber or fluorine rubber). The switching valve member 36 is disposed so that the peripheral portion of the switching valve member 36 is in close contact with the tapered portion 29 of the male side member 15 by the restoring force (elasticity) of the switching valve member 36 itself. Further, the peripheral edge portion of the switching valve member 36 is separated from the taper portion 29 by being bent toward the female connection portion 14 side, and the liquid passage 15a of the male connection portion 13 and the female connection portion around the filter F3. A liquid passage 35 that communicates with the 14 liquid passages 18b can be formed. In the present embodiment, the position where the taper portion 29 is in close contact is the closed position, and the position where the peripheral portion of the switching valve member 36 is bent (moved) toward the female connection portion 14 is formed. It is an allowable position. In addition, an opening / closing valve 36a formed by cutting one character so as to communicate both surfaces of the switching valve member 36 is provided at the approximate center of the switching valve member 36. The on-off valve 36a is closed by the restoring force (elasticity) of the switching valve member 36 itself.

Next, the effect | action is demonstrated based on FIG. 9 about the filtration instrument 11 of 3rd Embodiment comprised as mentioned above.
As shown in FIG. 9A, when a liquid containing a foreign substance flows into the liquid flow path 15a, the internal pressure of the liquid flow path 15a increases because the on-off valve 36a is closed, and the switching valve member 36 Is bent (moved) toward the female connector 14 side, and a liquid passage 35 is formed between the tapered portion 29 and the switching valve member 36. Then, the liquid passes through the liquid passage 35 and escapes to the liquid passage 18b, and is sucked into the syringe barrel (indicated by the arrow Y10). In this state, the filtration instrument 11 is formed with a suction passage that communicates from the distal end opening K of the male connection portion 13 through the liquid passage 35 to the opening at the distal end of the female connection portion 14.

  As shown in FIG. 9B, when the liquid sucked into the syringe barrel is pushed out into the female connection part 14 (fluid passage 18b), the peripheral part of the switching valve member 36 is formed by the switching valve member 36 itself. In addition to the restoring force, the taper portion 29 is in close contact with the liquid pressure of the liquid pushed out of the syringe barrel. In this state, the switching valve member 36 is in a state where the liquid passage 35 is closed. On the other hand, the liquid that has passed through the liquid passage 30a of the holding part 30 passes through the filter F3 and flows into the male connection part 13 (fluid passage 15a) while expanding the on-off valve 36a (arrow). Y11). In this state, the filtration instrument 11 discharges from the opening at the tip of the female connection part 14 to the tip opening K of the male connection part 13 through the liquid passage 30a of the holding part 30 and the filter F3. A passage is formed. As described above, the switching valve member 36 of the present embodiment is deformed between the permissible position and the closed position, so that the passage through which the liquid passes during suction and discharge is between the suction passage and the discharge passage. It functions as a switching means for switching.

Therefore, according to the third embodiment, the following effects can be obtained in addition to the effects (10) and (16) of the second embodiment.
(17) The switching valve member 36 is deformed (moved) between the allowable position and the closed position so as to switch the passage through which the liquid passes. For this reason, even if the filtering instrument 11 is not removed from the syringe barrel, the liquid containing the foreign matter is sucked into the syringe barrel without being filtered, and filtered through the filter F3, and the distal end opening K of the male connection portion 13 is filtered. It can be discharged from (the tip of the injection needle).

(18) The switching valve member 36 is an elastic body, and the peripheral portion of the switching valve member 36 and the tapered portion 29 of the male side member 15 are in close contact with each other at the closed position. For this reason, the liquid passage 35 can be reliably closed at the time of discharging the liquid.
(Fourth embodiment)
Next, a fourth embodiment embodying the present invention will be described with reference to FIG. In addition, the filtration instrument 11 of 4th Embodiment is made the same as 2nd Embodiment except the part demonstrated below.

  In the present embodiment, the liquid passage 30 a is not formed in the holding unit 30. Further, a circular film filter F4 is disposed in the accommodation space 20. A switching valve member 36 is disposed on the surface of the filter F4 on the male connection portion 13 side. A square packing 37 made of an elastic body (for example, silicon rubber or fluorine rubber) is disposed on the surface of the filter F4 on the female connection portion 14 side. The outer diameters of the filter F4, the switching valve member 36, and the square packing 37 are substantially the same. Further, the inner diameter of the square packing 37 is set slightly larger than the diameter of the holding portion 30. In this embodiment, a unit 38 is formed by sandwiching the filter F4 between the switching valve member 36 and the square packing 37, and the inside of the accommodation space 20 is advanced to the male connection part 13 side as the unit 38. And it is possible to move backward to the female connector 14 side.

Next, the effect | action is demonstrated based on FIG. 10 about the filtration instrument 11 of 4th Embodiment comprised as mentioned above.
As shown in FIG. 10A, when a liquid containing a foreign substance flows into the liquid flow path 15a, the unit 38 is moved to the female connection part 14 side by the liquid pressure of the liquid, and is moved to the holding part 30. Supported in contact. Then, the peripheral portion of the unit 38 is bent toward the female connection portion 14 by the liquid pressure of the liquid, and a liquid passage 35 is formed around (permitted position). Then, the liquid passes through the liquid passage 35 and escapes to the liquid passage 18b and is sucked into the syringe barrel (indicated by the arrow Y12). In this state, the filtration instrument 11 is formed with a suction passage that communicates from the distal end opening K of the male connection portion 13 through the liquid passage 35 to the opening at the distal end of the female connection portion 14.

  On the other hand, as shown in FIG. 10B, when the liquid sucked into the syringe barrel is pushed out into the female connection part 14 (liquid passage 18b), the unit 38 is connected to the male connection part 13 by the liquid pressure of the liquid. The peripheral portion of the unit 38 (switching valve member 36) and the tapered portion 29 of the male member 15 are in close contact with each other (closed position). At the closed position, the unit 38 (switching valve member 36) is in a state where the liquid passage 35 is closed. Then, the liquid passes through the filter F4 through the side of the holding unit 30, and flows into the inside (fluid passage 15a) of the male connection unit 13 while expanding the on-off valve 36a (shown by an arrow Y13). . In this state, the filtration instrument 11 is formed with a discharge passage that communicates from the opening at the tip of the female connection 14 to the tip opening K of the male connection 13 through the filter F4. As described above, the unit 38 (switching valve member 36) of the present embodiment is deformed between the permissible position and the closed position, so that the passage through which the liquid passes during the suction and the discharge is discharged from the suction passage and the discharge passage. It functions as a switching means for switching between the passages.

Therefore, according to the fourth embodiment, the same effect as that of the third embodiment can be obtained.
In addition, you may change the said embodiment as follows.
In the first embodiment, the shape of the movable body 25 may be different. For example, as shown in FIG. 11, the switching unit 27 may have a cross shape in a side view. Even with this configuration, the passage through which the liquid passes can be switched between the suction passage and the discharge passage during the suction and discharge of the liquid.

  In 1st Embodiment, before using the filtration instrument 11, you may comprise so that the movable body 25 may be hold | maintained in an allowable position. Even if comprised in this way, it can slide to the control position at the time of discharge, and can close the liquid flow hole 21. FIG.

In the first embodiment, the filter F1 may be configured by stacking a plurality of filters. Moreover, you may form with a sintered compact.
In the first embodiment, the liquid passage hole 21 may not be provided at the center of the filter F1. In this case, the straight portion 15b, the sliding rib portion 18c, and the movable body 25 are disposed at a position corresponding to the liquid passage hole 21. Even with this configuration, the passage through which the liquid passes can be switched between inhalation and ejection.

In the first embodiment, the conical portion 26a may not be provided.
In 3rd and 4th embodiment, it is good also as a liquid passage hole which can pass a liquid, without providing on-off valve 36a. In general, since a predetermined pressure is required for the liquid to pass through the filter, even if configured in this manner, the liquid is preferentially passed from the liquid passage 35 when the liquid is sucked. Can be passed to the side.

In the third and fourth embodiments, the on-off valve 36a may have a different shape such as a cross.
○ In the fourth embodiment, the corner packing 37 may not be provided. Even if comprised in this way, the filter F4 and the switching valve member 36 can move integrally in the storage space 20 with a hydraulic pressure.

  In each embodiment, each of the connection portions 13 and 14 may be a male type and a female type, or both ends of the filtration device 11 may be male, or both ends may be female. In the case of a male type, a lock mechanism may be provided.

  In each embodiment, it is not limited to forming the center line of the male connection part 13 and the female connection part 14 to coincide with each other, but the center line may be formed to be parallel or intersect at a predetermined angle. You may form so that it may do.

In each embodiment, the male connection portion 13 and the female connection portion 14 are not limited to projecting in a direction intersecting the filter, and may be formed in parallel.
In each embodiment, the number of male connection parts 13 and female connection parts 14 may be plural.

In each embodiment, the shape of the main body 12 is not limited to a circular shape in a side view, and may be a different shape such as a square or an ellipse.
In each embodiment, the male connection part 13 and the female connection part 14 do not have to satisfy a predetermined connection standard. In other words, the present invention is not limited to a form in which a standard-shaped injection needle or syringe can be connected, and may be modified as appropriate to have a shape that can be attached to a tube, a device (apparatus) for sucking liquid, or a liquid transport device.

In each embodiment, an injection needle may be provided directly instead of the male connection portion 13.
In each embodiment, a suction device such as a syringe may be provided integrally instead of the female connection portion 14.

  In each embodiment, the center of some parts of the parts constituting the suction passage or the discharge passage may not be arranged on the same straight line as other parts. If demonstrating it concretely, the center of the filters F1-F4 may not be on the centerline of the male type | mold connection part 13 and the female type | mold connection part 14, for example.

Next, a technical idea that can be grasped from the above embodiment and another example will be added below.
(A) In a filtering instrument in which a filter for removing foreign substances when a liquid sucked from the opening is discharged from the opening is disposed inside the housing having an opening through which liquid is sucked and discharged. Includes a suction passage through which the liquid passes when the liquid is sucked, a discharge passage through which the filter is disposed and the liquid passes through the filter when the liquid is discharged, and during the suction and the discharge. Switching means for switching the passage through which the liquid passes, and one of the suction passage and the discharge passage is disposed in the center of the housing, and the other passage is disposed around the passage disposed in the center. Instruments.

  (B) In a filtering instrument in which a filter for removing foreign substances when a liquid sucked from the opening is discharged from the opening is disposed inside a housing having an opening through which liquid is sucked and discharged. And the inside of the housing is arranged so as to partition the opening side and the opposite side, and a liquid passage hole through which the liquid passes when the liquid is inhaled is formed. Sometimes, the filtration device is provided with a movable body that is located at a permissible position that opens the liquid passage hole and is in the permissible state, and that can move to a closed position that closes the liquid passage hole when the liquid is discharged.

  (C) In a filtering instrument in which a filter for removing foreign matters when a liquid sucked from the opening is discharged from the opening is disposed inside a housing having an opening through which liquid is sucked and discharged. When the liquid is sucked, the liquid is positioned at an allowable position so as to be separated from the inner wall surface of the housing and form a liquid passage through which the liquid passes between the inner wall surface and the filter. A filtration instrument configured to be movable to a closed position that contacts a wall surface and closes the liquid passage.

(A) is a fragmentary sectional view of the filtration instrument of a 1st embodiment, (b) is a left side view similarly, (c) is a right side view similarly. (A) is the sectional view on the AA line shown to Fig.1 (a), (b) is the sectional view on the BB line of Fig.1 (a). (A) is a side view of the movable body, (b) is a front view of the movable body, and (c) is a cross-sectional view taken along the line CC of (b). (A), (b) is an expanded sectional view for demonstrating operation | movement of the filtration instrument of 1st Embodiment. (A) is sectional drawing of the filtration instrument of 2nd Embodiment, (b) is a left view similarly, (c) is a right view similarly. (A) is an enlarged view of a holding | maintenance part, (b) is an expanded sectional view similarly. (A) is a front view of a filter, (b) is the DD sectional view taken on the line of (a). (A), (b) is an expanded sectional view for demonstrating operation | movement of the filtration instrument of 2nd Embodiment. (A), (b) is an expanded sectional view of the filtration instrument of 3rd Embodiment. (A), (b) is an expanded sectional view of the filtration instrument of 4th Embodiment. (A) is a side view of the movable body in another example, and (b) is a front view of the same.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 11 ... Filtration instrument, 11a ... Housing, 14 ... Female type | mold connection part, 20 ... Accommodating space, 21 ... Liquid passage hole, 25 ... Movable body, 35 ... Liquid passage, F1-F4 ... Filter, K ... Tip opening part.

Claims (4)

In a filtering instrument in which a filter for removing foreign substances when discharging liquid sucked from the opening through the opening is disposed inside a housing having an opening through which liquid is sucked and discharged.
Inside the housing, a suction passage through which the liquid passes when the liquid is sucked, a discharge passage through which the filter is disposed and filtered while the liquid is discharged, the suction passage, Switching means for switching a passage through which the liquid passes during discharge,
A filtration instrument in which one of the suction passage and the discharge passage is disposed so as to surround the outside of the other passage, and the one passage is disposed inside the other passage.   The switching means is allowed to allow the liquid to pass through the suction passage during the suction, and moves while receiving the liquid pressure of the liquid by the pressure receiving surface formed in the switching means during the discharge. The filtration device according to claim 1, wherein the suction passage is closed so that the liquid does not pass through the suction passage. The filter is disposed so as to partition the opening side and the opposite side inside the housing,
The suction passage includes a liquid passage hole formed in the filter;
The discharge passage includes the filter that is disposed around the liquid passage hole and through which the liquid can pass during discharge.
The switching means is a movable body that is located at a permissible position that opens the liquid passage hole to be in the permissible state during the inhalation, and is movable to a closed position that closes the liquid passage hole during the ejection. Item 3. The filtration device according to Item 2. The suction passage includes a liquid passage formed between the filter and the inner wall surface at a position spaced from the inner wall surface inside the housing;
The discharge passage includes the filter through which the liquid can pass during the discharge and is in a position in contact with the inner wall surface,
The switching means is the filter that is movable between an allowable position in which the liquid passage is formed to be in the allowable state and a closed position that is in contact with the inner wall surface and closes the liquid passage. Item 3. The filtration device according to Item 2.

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