JP2016013360A - Hub assembly with diaphragm - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hub assembly with a diaphragm having a novel structure, the assembly effectively preventing a diapedesis of blood to outside.SOLUTION: In a hub assembly 10 with a diaphragm, the diaphragm 20 is formed in a disk shape. At the outer peripheral part of the diaphragm 20, an annular groove 58 positioned on the inner peripheral side of the hub 16 and extending in the circumferential direction is formed. A slit 18 is formed at the central part 56 that is locating on the inner peripheral side than the annular groove 58, a holding part 54 is formed that enters inside the annular groove 58 at the top part in the axial direction on the diaphragm 20 side in a pusher guide 24 or at the top part in the axial direction on the diaphragm 20 side in a pusher 22.

Description

  The present invention relates to a hub assembly with a septum that is used while being placed in a puncture state in a blood vessel or the like in the case of infusion, blood transfusion, artificial dialysis or the like in the medical field.

  Conventionally, a hub assembly with a partition wall is known as a kind of medical instrument for performing infusion, blood collection, hemodialysis and the like. For example, the needle assembly (100) described in Japanese Patent No. 4964592 (Patent Document 1) is one of them.

  By the way, in the needle assembly (100) described in Patent Document 1, a seal (142) including a disk valve provided with a slit is incorporated in the needle hub (120), and the seal is moved by the movement of the plunger (146). The slit of (142) is opened and closed. The plunger (146) is pressed against the seal (142) and the slit is opened to maintain the fluid passage in the hub in a communicating state, while the plunger (146) is separated from the seal (142) to seal (142). The slit is closed by its own elasticity, and the fluid passage in the hub is maintained in a blocked state to prevent leakage of blood or the like to the outside.

  However, in such a conventional needle assembly (100), when a large blood pressure is exerted in a direction opposite to the flow direction of the infusion or the like in a state where it is connected to a blood vessel with an indwelling needle, for example, the seal (142) There is a possibility that the fluid passage is opened without maintaining the closed state of the slit so as to bulge toward the proximal end side where the fluid is located, and the blood flows back to the proximal end side from the seal (142) and leaks. there were.

  In order to cope with such a problem, it is conceivable to increase the elastic force that keeps the slit closed by thickening the seal (142) itself. Since the resistance force of the seal (142) is increased and the operability for communicating and blocking the fluid passage is deteriorated, this is not an effective solution. In addition, the symbol in parentheses in the above description is that described in Patent Document 1.

Japanese Patent No. 4964592

  Here, the present invention has been made in the background as described above, and the solution is to provide a partition wall with a novel structure that effectively prevents leakage of blood and the like to the outside. It is to provide a hub assembly.

  According to a first aspect of the present invention, a partition with a slit is mounted inside a hub constituting a fluid passage, and a cylindrical pusher is disposed on one side of the partition, and the hub The pusher guide assembled to the inner circumference of the fluid passage allows the pusher to move by a predetermined distance in the length direction of the fluid passage, and the pusher is pushed into the slit of the partition wall so that the partition wall communicates. In the hub assembly with a partition configured as described above, the partition is formed in a disk shape, and an annular groove extending in the circumferential direction is formed in an outer peripheral portion of the partition, and the inner groove is formed inside the annular groove. While the slit is formed with respect to the central portion located on the periphery, the slit is formed in the annular concave groove at the tip end in the axial direction on the partition side or the tip end in the axial direction on the partition side in the pusher. The holding part to enter is shaped That it is characterized.

  In the hub assembly with a partition wall configured according to this aspect, the disk-shaped partition wall has an annular groove formed on the pusher guide side, and is provided at the tip of the pusher guide in the annular groove. A holding portion provided at the tip of the holding portion or the pusher is inserted. Thereby, for example, when the outer needle is fixed to the tip of the hub assembly and used as the outer needle unit in the indwelling needle assembly, the outer needle unit is placed in a state of being punctured into the blood vessel of the patient, Even when the partition wall is elastically deformed so as to swell toward the pusher due to blood pressure, the inner peripheral side wall surface of the annular groove and the inner peripheral surface of the pusher guide or the holding portion of the pusher are in contact with each other. The elastic deformation of the partition walls is limited. Thereby, the slit of a partition can be closed stably and the leakage of the blood from a partition can be prevented effectively.

  According to a second aspect of the present invention, there is provided a hub assembly with a partition according to the first aspect, wherein the holding portion is formed at an axial front end portion on the partition side of the pusher guide, and the partition An annular protrusion that protrudes toward the pusher in the length direction of the fluid flow path is formed in the outer peripheral portion of the annular groove, and the annular groove is formed along the inner periphery of the annular protrusion. The annular protrusion of the partition is held between the holding portion and the inner peripheral surface of the hub.

  In the hub assembly with a partition wall configured according to this aspect, an annular protrusion protruding in the length direction of the fluid passage is formed at the outer peripheral portion of the partition wall, and this annular protrusion is a holding portion in the pusher guide. Since, for example, the partition wall is not only sandwiched between the pusher guide and the hub in the length direction of the fluid passage, but also in the length direction of the fluid passage. It is possible to exert a supporting force on the partition wall in a direction orthogonal to the direction. Thus, for example, when a fluid passage is connected by inserting a male connector or the like into the hub assembly and pressing the pusher against the partition wall, the pushing of the pusher increases the length of the fluid passage relative to the partition wall. Even when an external force is exerted, the displacement of the partition wall from the hub assembly and the falling off from the assembly position are effectively prevented, and the partition wall can be stably held at the initial mounting position in the hub. .

  A third aspect of the present invention is a hub assembly with a partition wall according to the second aspect, wherein the annular protrusion protrudes larger than the center portion in the length direction of the fluid passage. It is.

  In the hub assembly with a partition wall structured according to this aspect, the dimension in the length direction of the fluid passage is larger in the annular protrusion than in the central portion. Thereby, the length dimension of the annular protrusion can be sufficiently secured, and the effect of holding the partition wall by the sandwiching between the holding portion in the pusher guide and the inner peripheral surface of the hub is stably exhibited. At the same time, since the increase in the length of the central portion is suppressed, the elastic deformation in the central portion of the partition wall accompanying the insertion of the male connector or the like can be easily realized, and the male connector or the like can be inserted well.

  According to a fourth aspect of the present invention, in the hub assembly with a partition wall according to the second or third aspect, the annular protrusion of the partition wall is compressed between the holding portion of the pusher guide and the hub. Is held in a state.

  In the hub assembly with a partition wall configured according to this aspect, the annular protrusion is compressed between the holding portion of the pusher guide and the inner peripheral surface of the hub. The friction between the outer peripheral surface of the holding portion and the inner peripheral surface of the hub can be increased, and when the partition is pulled in the insertion direction when a male connector or the like is inserted, the displacement of the partition in the hub assembly can be reduced. Dropout can be effectively prevented.

  A fifth aspect of the present invention is a hub assembly with a partition wall according to any one of the first to fourth aspects, wherein the pusher guide or the pusher inserted into the annular groove is the hub assembly. There is a gap between the holding portion and the inner peripheral wall surface of the annular groove.

  In the hub assembly with a partition wall configured according to this aspect, the required accuracy of each member such as the partition wall, the pusher guide, and the pusher can be reduced by the gap, and the manufacture of each member can be facilitated. .

  According to a sixth aspect of the present invention, a partition with a slit is mounted inside a hub constituting a fluid passage, and a slit of the partition is opened by inserting a male luer or the like from the base end side of the hub. In the hub assembly with a partition wall, the partition wall is formed in a disk shape, and an annular concave groove is formed in the outer peripheral portion of the partition wall and is located on the inner peripheral side of the hub and extends in the circumferential direction. The slit is formed in a central portion located on the inner periphery of the annular groove.

  In the hub assembly with a partition wall structured according to this aspect, since the annular groove is formed in the outer peripheral portion of the partition wall, the portion where the annular groove is formed in the partition wall is made thin. The central part on the circumferential side is relatively thick. As a result, a sealing force in the closed state of the slit can be obtained at the thick central portion, and the operability at the time of pushing in, for example, a pusher, luer, connector, etc. can be obtained by the thin outer peripheral portion. Improvement can be achieved. For this purpose, it is desirable that the annular groove is provided on the base end surface of the hub in the partition wall.

  In the hub assembly with a partition wall structured according to the present invention, the holding portion provided at the tip of the pusher guide or the pusher in the annular groove provided on the outer peripheral portion of the partition wall located on the inner peripheral side of the hub Therefore, the elastic deformation of the partition wall toward the pusher and the accompanying opening of the slit are restricted, and leakage of blood that flows backward can be effectively suppressed.

The perspective view which shows the whole outer needle unit provided with the hub assembly with a partition as one Embodiment of this invention. The front view of the outer needle unit shown by FIG. The right view which expands and shows the outer needle unit shown by FIG. IV-IV sectional drawing in FIG. The longitudinal cross-sectional view which expands and shows the principal part of the outer needle unit shown by FIG. VI-VI sectional drawing in FIG. The top view which expands and shows the partition which comprises the hub assembly with a partition of the outer needle unit shown by FIG. The bottom view which shows the partition shown by FIG. IX-IX sectional drawing in FIG. The longitudinal cross-sectional explanatory drawing for demonstrating the state which inserted the male connector from the base end side of the outer needle unit shown by FIG. 1, and made the fluid channel | path communicate. The longitudinal cross-sectional view which expands and shows the principal part of an outer needle unit provided with the hub assembly with a partition as another embodiment of this invention. The longitudinal cross-sectional view which expands and shows the principal part of an outer needle unit provided with the hub assembly with a partition as another embodiment of this invention.

  Embodiments of the present invention will be described below with reference to the drawings.

  First, FIGS. 1 to 6 show an outer needle unit 12 in an indwelling needle assembly including a hub assembly 10 with a partition wall as one embodiment of the present invention. The outer needle unit 12 of the present embodiment has a structure in which the proximal end of the hollow outer needle 14 is fixed to the distal end of the hub assembly 10 with a partition wall, and the outer needle unit 12 is not illustrated. The indwelling needle assembly is configured by inserting a known inner needle unit including the inner needle.

  Moreover, in the hub assembly 10 with a partition wall of the present embodiment, a disk valve 20 as a partition wall having a slit 18 formed therein is mounted inside an outer needle hub 16 as a hub. A cylindrical pusher 22 and a cylindrical pusher guide 24 are provided on the proximal end side of the disc valve 20 inside the outer needle hub 16. The pusher guide 24 allows the pusher 22 to move by a predetermined distance in the axial direction of the outer needle hub 16, and the pusher 22 is pushed into the slit 18 of the disc valve 20, whereby the tip of the disc valve 20 is moved. The side and the base end side are communicated.

  In the following description, the axial direction refers to the length direction of the fluid passage formed by the outer needle unit 12, and refers to the left-right direction in FIG. Further, the distal end side means the left side in FIG. 2, and the proximal end side means the right side in FIG.

  More specifically, the outer needle hub 16 has a substantially cylindrical shape as a whole, and the diameter on the proximal end side is larger than the diameter on the distal end side. In particular, the inner peripheral surface on the base end side has a tapered shape that gradually increases in diameter toward the opening over a predetermined length. The proximal end of the outer needle 14 is fixed to the distal end portion of the outer needle hub 16 in a fluid-tight manner. The outer needle hub 16 and the outer needle 14 are both made of a synthetic resin material, and the outer needle hub 16 is particularly hard.

  A lock portion 28 provided with a thread is formed on the outer peripheral surface of the proximal end side opening portion 26 of the outer needle hub 16, and a luer lock is provided with respect to the proximal end side opening portion 26 of the outer needle hub 16. A male connector of the type can be connected. A plurality of recesses 30 are formed on the outer peripheral surface of the outer needle hub 16 so that the user can easily grip the outer needle hub 16.

  In addition, an annular step 32 is formed at an intermediate portion in the length direction on the inner peripheral surface of the outer needle hub 16, and the inner diameter dimension on the distal end side of the step 32 is made smaller than the inner diameter dimension on the proximal end side. ing. Further, a plurality of engaging projections 33 are formed on the inner peripheral surface of the outer needle hub 16 on the proximal side of the step 32 on the circumference. The engaging projection 33 has an axial length and a protruding height corresponding to an engaging recess 50 of the pusher guide 24 described later.

  In the outer needle hub 16, the disc valve 20 is arranged in contact with the step 32, and the pusher is overlapped with the outer peripheral portion of the disc valve 20 from the base end side. A guide 24 is arranged, and the pusher 22 is assembled in a state where the tip portion is inserted into the pusher guide 24. In the outer needle hub 16, the tip of the pusher 22 is disposed so as to face the disc valve 20 in the axial direction.

  The pusher 22 has a substantially cylindrical shape that is open at both ends in the axial direction, and includes an inner peripheral surface 34 that forms a through hole extending linearly over the entire length in the axial direction. The outer peripheral surface of the tip portion 36 of the pusher 22 has a tapered surface shape that gradually decreases in diameter toward the tip side. On the other hand, the proximal end portion 38 has an outer peripheral surface whose diameter is increased in a step shape, and an inner peripheral surface is formed in a tapered shape that gradually increases in diameter toward the proximal end side.

  The outer peripheral surface of the intermediate portion in the axial direction of the pusher 22 has a smaller diameter than both the maximum outer diameter dimension of the distal end portion 36 and the outer diameter dimension of the proximal end portion. Thereby, the outer peripheral surface of the axial direction intermediate part of the pusher 22 is made into the concave groove 40 extended continuously over the perimeter of the circumferential direction. The wall surface on the distal end side of the concave groove 40 is a locking surface 42 that is locked to the pusher guide 24 at the initial position of the pusher 22 in the outer needle hub 16 and is positioned in the axial direction.

  The pusher guide 24 in which the distal end portion 36 of the pusher 22 is inserted and assembled has a substantially cylindrical shape as a whole, and has a circular shape that forms an insertion hole extending linearly over substantially the entire length in the axial direction. An inner peripheral surface 44 is provided. The outer peripheral surface of the pusher guide 24 is a fitting surface that is fitted into the inner peripheral surface of the outer needle hub 16.

  In addition, a protruding portion 46 that protrudes toward the inner peripheral side is formed in an annular shape that is continuous in the circumferential direction at the proximal end portion of the inner peripheral surface 44 of the pusher guide 24. The protruding portion 46 enters the concave groove 40 on the outer peripheral surface of the pusher 22 inserted into the pusher guide 24. Further, at the initial position of the pusher 22, the locking surface 42 of the pusher 22 abuts on the locking surface 48 at the distal end in the axial direction of the protruding portion 46, whereby the proximal side of the pusher 22 from the pusher guide 24. It is positioned so that it is prevented from slipping out.

  The inner diameter dimension of the protrusion 46 is substantially the same as or slightly larger than the diameter of the outer peripheral surface of the bottom of the concave groove 40 of the pusher 22. The pusher 22 is supported and guided substantially coaxially in the pusher guide 24. The inner diameter of the pusher guide 24 is substantially equal to or slightly larger than the maximum outer diameter of the tip portion 36 of the pusher 22.

  Further, the outer peripheral surface of the pusher guide 24 is substantially equal to the inner peripheral surface on the base end side with respect to the step 32 of the outer needle hub 16, and the substantially entire outer peripheral surface of the pusher guide 24 is the outer needle hub 16. It is coaxially held in contact with the inner peripheral surface on the base end side with respect to the step 32. Note that an engaging recess 50 that extends continuously over the entire circumference in the circumferential direction is provided in the axially intermediate portion of the outer circumferential surface of the pusher guide 24. The pusher guide 24 is axially positioned and assembled with respect to the outer needle hub 16 by the concavo-convex engagement between the engagement convex portion 33 of the outer needle hub 16 and the engagement concave portion 50 of the pusher guide 24. Yes.

  Furthermore, a holding portion 54 that protrudes in the axial direction from the inner peripheral edge portion toward the distal end side is integrally formed on the distal end side end surface 52 of the pusher guide 24. The holding portion 54 has a cylindrical shape that is continuous over the entire circumference in the circumferential direction, and enters the annular protrusion 60 of the disk valve 20 to be described later, whereby the inner peripheral surface of the outer needle hub 16 and the holding portion. The annular protrusion 60 is sandwiched in the radial direction between the outer peripheral surface 54 and the disc valve 20 is held.

  In the present embodiment, the holding portion 54 is formed so as to protrude further to the front end side in the axial direction than the front end of the presser 22 inserted in the pusher guide 24 and positioned on the rear end side by the locking surface 48. ing. Then, the holding portion 54 enters an annular groove 58 of the disc valve 20 described later, and the front end surface of the holding portion 54 is brought into contact with the bottom wall surface of the annular groove 58, so that the outer peripheral portion of the disc valve 20. Is held against the outer needle hub 16.

  The outer needle hub 16, the pusher 22, and the pusher guide 24 described above have such rigidity that the initial shape can be maintained without being substantially deformed with respect to the acting external force. Suitably, what was formed with the hard synthetic resin material may be employ | adopted.

  On the other hand, the disc valve 20 assembled by holding the outer peripheral edge portion fixedly to the outer needle hub 16 by the pusher guide 24 is shown in FIGS. The disc valve 20 is made of rubber or elastomer and is a disc-like valve body that can be elastically deformed. The disc valve 20 has a thick circular shape whose thickness dimension (vertical direction dimension in FIG. 9) is substantially constant. A trifurcated slit 18 is formed through the central portion 56. In addition, such a slit may be a linear shape, a cross shape, or a radial shape extending in four or more directions from the center.

  Further, on the base end side end surface (the lower end surface in FIG. 9) of the disc valve 20, a groove-shaped annular groove extending continuously around the entire circumference in the circumferential direction with a predetermined radial width dimension near the outer peripheral edge. 58 is formed. In the present embodiment, the outer diameter dimension of the central portion 56 of the disc valve 20 in a single product state is substantially the same as or slightly smaller than the inner diameter dimension of the holding portion 54 of the pusher guide 24, and an annular groove The radial width dimension of 58 is larger than the radial width dimension of the holding portion 54 in the pusher guide 24. In the state where the disc valve 20 is housed and mounted on the outer needle hub 16, the annular groove 58 is located on the inner peripheral side of the outer needle hub 16 and extends in the circumferential direction on the outer peripheral portion of the disc valve 20. It opens toward the base end side.

  Furthermore, an annular protrusion 60 that protrudes toward the base end side is integrally formed from the outer peripheral edge of the disc valve 20. The annular protrusion 60 is formed in a substantially cylindrical shape continuously over the entire circumference in the circumferential direction so that the outer peripheral wall portion of the annular groove 58 extends to the base end side as it is. An annular protrusion 60 is provided.

  The base end side end surface of the annular protrusion 60 protrudes larger in the axial direction than the base end side end surface of the central portion 56 in the base end side. In other words, the axial thickness dimension of the disc valve 20 is made larger at the annular protrusion 60 at the outer peripheral portion than at the central portion 56.

  The outer diameter dimension of the disk valve 20 in a single product state is slightly larger than the outer diameter dimension of the step 32 in the outer needle hub 16. As a result, in a state where the disc valve 20 is assembled to the outer needle hub 16, a radial compressive force is exerted on the disc valve 20, and a stress for holding the slit 18 in a closed state is applied. Yes.

  The hub assembly 10 with a partition wall of the present embodiment is configured by assembling the disc valve 20, the pusher 22, and the pusher guide 24 to the outer needle hub 16 having the above-described structure. For example, the disk valve 20, the pusher 22, and the pusher guide 24 are assembled in advance, and these assembled bodies are connected to the engagement convex portion 33 from the proximal end side opening 26 of the outer needle hub 16. And can be realized by press-fitting until the engaging recess 50 is engaged.

  In the hub assembly 10 with the partition wall in the assembled state, the outer peripheral end portion of the distal end surface of the disc valve 20 is in contact with the step 32 on the inner peripheral surface of the outer needle hub 16. On the other hand, the base end side end surface of the annular protrusion 60 provided on the base end surface of the disc valve 20 is in contact with the front end side end surface 52 of the pusher guide 24 and the bottom wall surface of the annular groove 58 is the pusher guide 24. Is in contact with the front end surface of the holding portion 54. As a result, the outer peripheral end of the disc valve 20 is clamped and fixed in the axial direction by the step 32 on the inner peripheral surface of the outer needle hub 16, the distal end surface 52 of the pusher guide 24 and the holding portion 54. In addition, these may contact | abut by zero touch, or the outer peripheral edge part of the disk valve 20 may be compressed by the axial direction by pressing.

  In this assembled state, the disc valve 20 is compressed in the radial direction by the inner peripheral surface of the outer needle hub 16, so that the inner and outer peripheral surfaces of the annular projection 60 are the outer peripheral surface of the holding portion 54 and the inner surface of the outer needle hub 16. It is pressed against the peripheral surface and compressed. Further, between the radial direction between the wall surface on the inner circumferential side of the annular groove 58 of the disc valve 20 and the inner circumferential surface of the holding portion 54 of the pusher guide 24, it spreads in the radial direction and extends over the entire circumference in the circumferential direction. A continuous annular gap 62 is formed.

  Furthermore, in the assembled state as described above, it is preferable that the proximal end surface of the central portion 56 of the disc valve 20 and the distal end surface of the pusher 22 are in contact with each other. Thereby, the position of the front end side of the pusher 22 can be defined, the pusher 22 can be positioned in the axial direction between the disc valve 20 and the pusher guide 24, and the pusher 22 can be axially positioned. The risk of tilting with respect to it may be reduced.

  The outer needle unit 12 of this embodiment is configured by fixing the proximal end of the outer needle 14 to the distal end of the hub assembly 10 with a partition wall having the above-described structure. As the outer needle 14, a conventionally known one can be adopted, and for example, as shown in Patent Document 1, it may be a metal hollow needle formed of stainless steel or the like. You may form with the material which has, for example, various soft resins. Further, a tapered outer peripheral surface 64 is formed at the distal end portion of the outer needle 14 to reduce puncture resistance to the living body, and a plurality of penetrating holes are formed in the peripheral wall of the distal end portion of the outer needle 14. The hole 66 is provided to improve the flow efficiency of the fluid with respect to the outer needle 14.

  Further, an indwelling needle assembly is configured by inserting an inner needle unit including an inner needle through the outer needle unit 12. Examples of the inner needle unit include a structure in which the inner needle (10) extends from the inner needle hub (12) described in JP2012-130523A. However, the inner needle hub (12) described in the above publication is provided with a needle tip protector (78), but such a structure for protecting the needle tip is not essential. The inner needle may be a solid needle. By inserting the inner needle unit into the outer needle unit 12, the inner needle is inserted into the slit 18 of the central portion 56 of the disc valve 20, but the position of the pusher 22 is the initial position shown in FIG. The disc valve 20 is not greatly elastically deformed.

  When using the indwelling needle assembly having the above-described structure, first, after puncturing the indwelling needle assembly into the blood vessel of the patient, the inner needle unit is pulled out from the outer needle unit 12 to the proximal end side. The needle unit 12 is placed while being punctured into a patient's blood vessel. At that time, by removing the inner needle from the disc valve 20, the disc valve 20 is restored to the initial shape, and the slit 18 is closed. Thereby, the blood of the patient can be prevented from leaking back into the proximal end side from the disc valve 20 in the outer needle unit 12.

  Then, as shown in FIG. 10, the distal end portion of the syringe 68, which is a male connector, is inserted from the proximal end side of the outer unit 12 and can be released from the proximal end opening 26 of the outer unit 12. Connect by taper engagement. Alternatively, when a luer lock connector is employed as the male connector, the lock portion 28 is screwed and connected. Along with this, the pusher 22 is pushed into the axial tip side by the tip portion of the syringe 68, and the tip portion 36 of the pusher 22 is pushed into the slit 18 of the disc valve 20. As a result, the central portion 56 of the disc valve 20 is elastically deformed toward the axially distal end side, the slit 18 is opened, and the proximal end side and the distal end side of the disc valve 20 communicate with each other. As a result, a fluid passage 70 is formed from the inner region of the syringe 68 through the outer needle unit 12 and into the patient's blood vessel. Through the fluid passage 70, infusion, blood transfusion, blood collection, and the like are performed.

  When the pusher 22 is pushed toward the distal end in the axial direction, the outer peripheral surface of the pusher 22 is applied to the pusher guide 24 and the inner peripheral surface of the protrusion 46 provided on the pusher guide 24 with zero touch. The pusher 22 moves along the inner peripheral surface of the pusher guide 24 and is pushed into the disk valve 20 on the axially leading end side because it is in contact with each other or separated by a slight separation distance. Alternatively, even if it is inclined with respect to the axial direction, the pusher 22 is pushed into the disc valve 20 with a slight inclination angle.

  After the treatment or when the treatment is interrupted, the disc valve 20 is restored to its initial shape by withdrawing the syringe 68 from the proximal opening 26 of the outer needle unit 12, and the pusher 22 is restored by this elastic restoring force. It is pushed back to the base end side. The movement of the pusher 22 toward the proximal end is limited by the disk valve 20 being restored to the initial shape or by the contact surfaces 42 and 48 of the pusher 22 and the pusher guide 24 being brought into contact with each other. Such an operation can be performed with one hand, which not only reduces the labor of the medical staff, but also allows other treatments to be performed at the same time, thereby improving the efficiency of the treatment.

  In the hub assembly 10 with the partition wall of the present embodiment having the above-described structure, the outer peripheral end portion of the disc valve 20 is an axis between the step 32 provided on the inner peripheral surface of the outer needle hub 16 and the pusher guide 24. In addition to being sandwiched between the directions, the annular protrusion 60 provided on the disc valve 20 is also sandwiched between the holding portion 54 provided at the tip of the pusher guide 24 and the outer needle hub 16 in the radial direction. . Thereby, even if the disc valve 20 is stably supported with respect to the outer needle hub 16 and the pushing force toward the axial front end side is exerted on the disc valve 20 when the syringe 68 is inserted, the outer needle The risk of displacement and dropping of the disc valve 20 from the hub 16 can be reduced.

  Further, since the distal end of the holding portion 54 enters the annular concave groove 58 of the disc valve 20, such elastic deformation is effective even when the disc valve 20 swells and is elastically deformed due to blood pressure, for example. Limited to That is, when the disc valve 20 is elastically deformed toward the axial base end side, the inner peripheral side wall surface of the annular groove 58 and the inner peripheral surface of the holding portion 54 abut, and further elastic deformation is limited. The Thereby, the leakage of blood due to the elastic deformation of the disc valve 20 toward the proximal end side in the axial direction and the opening of the slit 18 can be effectively prevented.

  Moreover, the deformation that bulges toward the axial base end side of the disc valve 20 based on the stopper action caused by the outer peripheral surface of the central portion 56 that is the inner peripheral side wall surface of the annular groove 58 abutting against the inner peripheral surface of the holding portion 54. Since the amount is suppressed, even if the thickness dimension of the central portion 56 of the disc valve 20 is not excessively increased, problems such as blood backflow due to inadvertent opening of the slit 18 due to blood pressure action and the like are prevented. obtain. Therefore, in the central portion 56 of the disc valve 20, the deformation resistance force when expanding toward the axially distal end side can be set sufficiently smaller than the deformation resistance force when expanding toward the axially proximal end side. As a result, in a normal communication operation in which the pusher 22 is pressed against the central portion 56 of the disc valve 20 to open the slit 18, the elastic reaction force of the disc valve 20 exerted on the pusher 22 is suppressed to be small, and the operability is good. It is possible to achieve this while achieving the above-described effect of preventing blood backflow and the like.

  Furthermore, in the present embodiment, the inner and outer peripheral surfaces of the annular protrusion 60 in the disc valve 20 are pressed against the outer peripheral surface of the holding portion 54 and the inner peripheral surface of the outer needle hub 16 in the pusher guide 24, and in a compressed state. Since it is held, the friction between the annular protrusion 60 and the outer needle hub 16 and the holding portion 54 can be increased, and the disc valve 20 can be displaced and dropped from the outer needle hub 16 more effectively. Can be prevented.

  Furthermore, in the disc valve 20 of the present embodiment, the axial thickness dimension at the site where the annular protrusion 60 is formed is larger than the axial thickness dimension of the central portion 56, that is, The thickness dimension of the annular protrusion 60 is increased while keeping the thickness dimension small. Thereby, the supporting force of the disc valve 20 by the annular protrusion 60 is sufficiently ensured, and the ease of elastic deformation of the central portion 56 when the syringe 68 is inserted is sufficiently ensured.

  In particular, in the present embodiment, since the gap 62 is provided between the holding portion 54 and the inner peripheral side wall surface of the annular groove 58, the pusher 22 is pressed against the central portion 56 of the disc valve 20. When the elastic deformation starts, the elastic deformation is absorbed by the gap 62, so that the deformation resistance during the opening operation of the disc valve 20 due to the pressing of the disc valve 20 against the holding portion 54 is reduced, and the central portion is reduced. 56 diameter expansion deformation is easily allowed. Thereby, the ease of elastic deformation of the central portion 56, that is, the ease of insertion of the syringe 68 can be improved. Further, the gap 62 can reduce the required dimensional accuracy of each member such as the disc valve 20 and the pusher guide 24, and the manufacture of these members can be facilitated.

  Although the embodiments of the present invention have been described in detail above, the present invention is not limited by the specific descriptions, and is implemented in a mode in which various changes, corrections, improvements, and the like are added based on the knowledge of those skilled in the art. Any of such embodiments can be included in the scope of the present invention without departing from the spirit of the present invention.

  For example, in the above embodiment, the outer needle 14 is fixed to the tip of the hub assembly 10 with a partition wall, and the inner needle unit is inserted into the outer needle unit 12 to constitute the indwelling needle assembly. The indwelling catheter assembly may be configured by inserting the inner needle unit into the outer needle unit by affixing a catheter or tube to the distal end of the hub assembly 10 with a partition wall. Also in such an indwelling catheter assembly or the like, it is possible to effectively prevent displacement and dropout of the partition wall mounted inside the hub.

  In the above embodiment, the protruding front end surface of the holding portion 54 and the bottom wall surface of the annular groove 58 are in contact. However, if the holding portion 54 is in the annular groove 58, these surfaces are in contact. You don't have to.

  Furthermore, you may provide the protrusion which protrudes in the outer peripheral side on the outer peripheral surface of the holding | maintenance part 54. FIG. By further compressing and holding the annular projection 60 of the disc valve 20 by such a projection, the disc valve 20 can be held more securely with respect to the outer needle hub 16.

  Furthermore, in the present invention, the gap 62 between the inner peripheral surface of the holding portion 54 and the inner peripheral wall surface of the annular groove 58 of the disc valve 20 is not essential. That is, in the assembled state of the hub assembly 10 with the partition wall, the inner peripheral surface of the holding portion 54 and the outer peripheral surface of the central portion 56 of the disc valve 20 may be in contact with each other. The elastic deformation is further limited, and the blood leakage preventing action can be more effectively exhibited.

  Moreover, in the said embodiment, although the annular protrusion 60, the holding | maintenance part 54, the annular groove 58, etc. were formed continuously over the perimeter of the circumferential direction, at least one of them is intermittent in the circumferential direction. It is also possible to form it.

  The partition mounted on the hub assembly is, for example, a disc-shaped elastic body (seal 142) integrally formed with a substantially tubular side wall (147) such as the valve (140) described in Patent Document 1. An annular groove may be provided, or an annular groove is provided for a disk-shaped elastic body, and the axial base end surface of the central portion and the axial base end surface of the annular protrusion are It may be located on the same plane.

  Furthermore, in the said embodiment, although the cyclic | annular protrusion 60 was made into the substantially cylindrical shape extended in an axial direction, the protrusion etc. which extend in the radial direction from the inner peripheral surface of a cyclic | annular protrusion, or an outer peripheral surface, etc. may be provided, for example. .

  Further, in the above embodiment, the disc valve 20 is provided with the annular protrusion 60 at the outer peripheral edge portion, and the annular groove 58 that opens to the proximal end side along the inner periphery of the annular protrusion 60 is formed. However, it is not limited to such an embodiment. For example, as shown in FIG. 11, in the disc valve 20, a circumferential groove 72 that opens to the proximal end side and the outer peripheral side and extends in the circumferential direction may be provided in the outer peripheral edge portion of the proximal end side surface. In such a disc valve 20, the outer peripheral side of the circumferential groove 72 is covered with the peripheral wall of the outer needle hub 16 by being assembled to the inner periphery of the outer needle hub 16. As a result, an annular concave groove 74 that extends in the circumferential direction with the outer peripheral portion of the disc valve 20 positioned on the inner peripheral side of the outer needle hub 16 is formed to open toward the proximal end side in the axial direction. That is, in the annular concave groove 74, the peripheral wall portion on the inner peripheral side of the groove is constituted by the central portion 56 of the disc valve 20, and the peripheral wall portion on the outer peripheral side of the groove is constituted by the peripheral wall of the outer needle hub 16. An annular groove 74 is formed in cooperation with the disc valve 20 and the outer needle hub 16. Like the annular groove 58 in the above embodiment, the annular groove 74 is assembled in the outer needle hub 16 with the holding portion 54 of the pusher guide 24 entering the axial direction. Under such an assembled state, as in the above-described embodiment, the prevention of blood backflow and the like is based on the stopper action caused by the contact of the central portion 56, which is the peripheral wall portion on the inner peripheral side of the annular groove 74, with the holding portion 54. The effect can be exhibited effectively. As is clear from this, in the present invention, the annular protrusion 60 in the disc valve 20 is not an essential configuration.

  Further, in the above embodiment, the holding portion 54 of the pusher guide 24 enters the annular concave groove 58 of the disc valve 20, while the proximal end surface of the central portion 56 of the disc valve 20 and the distal end surface of the pusher 22 are in contact with each other. However, it is not limited to such an embodiment. That is, for example, as shown in FIG. 12, a holding portion 78 may be provided at the foremost end of the pusher 76 in the axial direction so as to enter the annular groove 82 of the disc valve 80. In the embodiment shown in FIG. 12, a cylindrical holding portion 78 that protrudes from the distal end surface of the distal end portion 36 of the pusher 76 toward the axial distal end side is formed, and the inner diameter dimension of the annular groove 82 is the holding portion. The inner diameter dimension of 78 is smaller. As a result, the holding portion 78 of the pusher 76 enters the annular groove 82, and the bottom wall surface of the annular groove 82 is in contact with the tip surface of the holding portion 78 of the pusher 76. As a result, the effect of preventing blood backflow or the like is effectively exerted on the basis of the stopper action of the central portion 56, which is the peripheral wall portion on the inner peripheral side of the annular groove 82, by the contact with the holding portion 78 of the pusher 76. obtain. Further, in the embodiment shown in FIG. 12, the radial space between the inner peripheral wall surface of the annular groove 82 of the disc valve 80 and the inner peripheral surface of the holding portion 78 of the pusher 76 spreads in the radial direction. An annular gap 84 that is continuous over the entire circumference in the direction is formed. In this embodiment, the holding portion 54 of the pusher guide 24 is also inserted into the annular groove 82, but this is not necessary, and the annular protrusion 60 of the disc valve 80 and the holding portion 54 of the pusher guide 24 are formed. It does not have to be done. Further, the bottom wall surface of the annular groove 82 and the front end surface of the holding portion 78 of the pusher 76 do not need to be in contact with each other, and the holding portion 78 of the pusher 76 only needs to enter the annular groove 82.

  In addition, in this invention, the aspect which does not employ | adopt a pusher and a pusher guide can also be employ | adopted. That is, in such a hub assembly with a partition wall, the distal end of a male luer such as a syringe is inserted and pushed in from the proximal end side opening of the outer needle hub, whereby the disk valve as the partition wall is elastically deformed and the slit is opened. To be done. In such a disc valve, the annular groove forming portion in the outer peripheral portion is made thin, while the central portion on the inner peripheral side of the annular groove is made relatively thick. In order to support the outer peripheral edge of the disc valve to the outer needle hub, a fixing ring may be provided instead of the pusher guide of the above embodiment, or the outer periphery of the disc valve may be bonded.

  In addition, it is preferable that the slit provided in the partition employed in the present invention has a larger opening dimension on the proximal end side than the opening dimension on the distal end side (the radial length of the slit in each of the above embodiments). Thereby, even when blood flows backward, the slit can be made difficult to open, and the pressure resistance against blood pressure can be improved.

10: Hub assembly with partition, 16: Outer needle hub (hub), 18: Slit, 20, 80: Disc valve (partition), 22, 76: Pusher, 24: Pusher guide, 54, 78: Holding part , 56: central portion, 58, 74, 82: annular groove, 60: annular protrusion, 62, 84: gap, 70: fluid passage

Claims (6)

A partition with a slit is mounted inside the hub constituting the fluid passage, and a cylindrical pusher is arranged on one side of the partition, and the pusher is assembled to the inner periphery of the hub. With a partition, the guide is movable by a predetermined distance in the length direction of the fluid passage by a guide, and the partition is communicated when the pusher is pushed into the slit of the partition In the hub assembly,
The partition wall is formed in a disk shape, and an annular groove extending in the circumferential direction is formed on the inner peripheral side of the hub on the outer peripheral portion of the partition wall, and is positioned on the inner periphery of the annular groove. While the slit is formed in the central part to
A hub assembly with a partition wall, characterized in that a holding portion that enters the annular groove is formed at an axial front end portion of the pusher guide on the partition wall side or an axial front end portion of the pusher on the partition wall side. Solid. The holding portion is formed at the tip end in the axial direction on the partition side in the pusher guide,
An annular protrusion that protrudes toward the pusher in the length direction of the fluid flow path is formed at the outer peripheral portion of the partition wall, and the annular groove is formed along the inner periphery of the annular protrusion. Has been
The hub assembly with a partition wall according to claim 1, wherein the annular protrusion of the partition wall is held between the holding portion and the inner peripheral surface of the hub.   The hub assembly with a partition wall according to claim 2, wherein the annular protrusion protrudes larger than the central portion in the length direction of the fluid passage.   The hub assembly with a partition according to claim 2 or 3, wherein the annular protrusion of the partition is held in a compressed state between the holding portion of the pusher guide and the hub.   5. The gap according to claim 1, wherein there is a gap between the pusher guide inserted into the annular groove or the holding portion of the pusher and a wall surface on the inner peripheral side of the annular groove. 2. A hub assembly with a partition wall according to item 1. A partition-equipped hub in which a partition with a slit is mounted inside the hub constituting the fluid passage, and a slit of the partition is opened by inserting a male luer or the like from the proximal end side of the hub In the assembly,
The partition wall is formed in a disk shape, and an annular groove extending in the circumferential direction is formed on the inner peripheral side of the hub on the outer peripheral portion of the partition wall, and is positioned on the inner periphery of the annular groove. A hub assembly with a partition wall, wherein the slit is formed in a central portion.

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