JP5372490B2 - Medical valve - Google Patents

Medical valve Download PDF

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Publication number
JP5372490B2
JP5372490B2 JP2008331717A JP2008331717A JP5372490B2 JP 5372490 B2 JP5372490 B2 JP 5372490B2 JP 2008331717 A JP2008331717 A JP 2008331717A JP 2008331717 A JP2008331717 A JP 2008331717A JP 5372490 B2 JP5372490 B2 JP 5372490B2
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portion
valve body
elastic valve
annular
inner peripheral
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JP2010148757A (en
Inventor
邦晃 松本
徳寛 比恵島
賢 鈴木
昭彦 石▲崎▼
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ニプロ株式会社
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a medical valve of novel structure, capable of preventing a fluid such as a liquid medicine from staying, and capable of enhancing durability of a valve element. <P>SOLUTION: An annular groove 54 in an inner face 50 side of the elastic valve element 38 is formed with a curved recess cross section spread from a locking portion of a locking protrusion 70 toward an inner circumferential side, when arranging the elastic valve element 38 in an opening member constituting an opening part of a fluid flow passage, by locking the locking protrusion 70 and a locking protrusion 80 to the annular groove 54 and an annular groove 56 provided in an outer circumferential portion of the disk-like-shaped elastic valve element 38, so as to form a clearance between an inner circumferential face of the locking protrusion 70 and an inner face of an annular groove 54 inner face, and the annular groove 54 of the elastic valve element 38 is made to abut on the inner circumferential face of the locking protrusion 70 under a close contact state, when the elastic valve element 38 is elastically deformed, by forming a curved projecting cross section corresponding to the curved recess cross section of the annular groove 54, on the inner circumferential face of the locking protrusion 70. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a medical valve that is used in a fluid flow path in the medical field such as an infusion route and that can connect a medical connector (male connector) such as a syringe to the fluid flow path.

  In a fluid flow path that performs infusion, blood collection, and the like in the medical field, a medical valve is used so that a male connector such as a syringe can be connected as necessary. For example, in a three-way stopcock or Y-shaped connector that is a kind of fluid flow path forming member, a fluid flow path is formed between a pair of flow path openings, and a medical valve is provided in the remaining one flow path opening. It is installed. Then, by allowing a male connector such as a syringe to be connected to the fluid flow path via this medical valve, it is possible to perform mixed injection of a chemical solution or the like.

  By the way, a split septum type medical valve described in Patent Document 1 and Patent Document 2 is known as a kind of such a medical valve. This medical valve has a structure in which a disk-like elastic valve body having a slit formed in the central portion is attached to an opening member constituting an opening portion of a fluid flow path. Then, the male connector can be connected to the fluid flow path in a communicating state by directly inserting the distal end portion of the male connector into the slit of the elastic valve body. Further, by pulling out the distal end portion of the male connector such as a syringe thus connected from the elastic valve body, the fluid flow path is held in a shut-off state by the restoring action of the elastic valve body simultaneously with the extraction. .

  Further, in the split septum type medical valve, it is necessary to firmly fix the elastic valve body to the opening of the opening member so that the elastic valve body does not come off when the male connector is attached or detached. Therefore, conventionally, as shown in Patent Documents 1 and 2, the outer peripheral portion of the elastic valve body is sandwiched from both sides in the thickness direction by a pair of claw-shaped annular locking projections provided on the opening member. The structure supported by is adopted.

JP-T-2-502976 JP 2004-237133 A

  However, in the conventional structure in which the outer peripheral portion of the disc-shaped elastic valve body is sandwiched and supported by a pair of claw-shaped annular locking protrusions, the annular locking protrusion is formed at the support portion of the elastic valve body by the annular locking protrusion. A small gap is easily generated between the portion and the elastic valve body. This gap is difficult to avoid because it is caused not only by a dimensional error during molding of the annular locking projection and the elastic valve body but also by elastic deformation of the elastic valve body. In addition, when the male connector is repeatedly attached to and detached from the elastic valve body, a new gap may be generated due to plastic deformation or deterioration of the elastic valve body, and it is difficult to manage the generation of the gap.

  And since there exists such a clearance gap, there exists a problem which a chemical | medical solution etc. tends to stay in a clearance gap. In particular, since the gap is narrow, the retained chemical solution or the like is difficult to escape due to the action of the surface tension of the chemical solution, and there is a case where it is necessary to take measures against contamination due to the long-term retention.

  Here, the present invention has been made in the background as described above, and the problem to be solved is that the retention of a chemical solution or the like in the gap generated in the support portion of the disk-shaped elastic valve body. An object of the present invention is to provide a medical valve having a novel structure that can prevent the stress concentration at the time of elastic deformation of the elastic valve body and improve durability.

In the present invention, a disc-shaped elastic valve body having a slit formed in the central portion is attached to an opening member constituting the opening portion of the fluid flow path, and a male connector is attached to the slit of the elastic valve body. A medical valve which can be repeatedly inserted and removed, and an annular constricted portion is provided by forming annular grooves extending in the circumferential direction on both the inner and outer surfaces of the outer peripheral portion of the elastic valve body, and the elastic valve body The outer peripheral side of the constricted part is an annular fixed part, and a valve seat is formed protruding from the inner peripheral side of the opening member, and the annular ring is formed from the opening side with respect to the opening member. Is assembled and fixed, and the annular fixing portion of the elastic valve body is sandwiched and supported by the valve seat and the annular ring, and is attached to the inner peripheral edge of the valve seat and the annular ring. Each locking projection is formed as a protrusion These locking protrusions are locked to the annular grooves formed on both the inner and outer surfaces of the elastic valve body, and the inner peripheral surface of the valve seat on which the locking protrusions are formed to protrude. A curved convex cross section is formed, and an inner peripheral side wall surface of the annular groove formed on the inner surface of the elastic valve body is a curved concave cross sectional shape corresponding to the inner peripheral surface of the valve seat. Te, and the inward wall of the annular groove of the elastic valve body to the inner peripheral surface of the valve seat is facing across a gap in the radial direction, the slit of the male connector is elastic valve body The medical valve is configured such that the inner peripheral side wall surface of the annular groove of the elastic valve body comes into contact with and overlaps the inner peripheral surface of the valve seat by being inserted into And

[Operation and effect of the present invention]
In the medical valve having the structure according to the present invention, the inner peripheral surface of the valve seat provided with the locking projection and the elastic valve at the locking portion of the locking projection with respect to the inner surface side (fluid flow channel side) of the elastic valve body A gap is positively formed between the body. Therefore, even when a chemical solution or the like enters the gap between the locking projection and the elastic valve body, the gap is set large, so that retention due to surface tension can be prevented.

  In addition, the inner peripheral surface of the valve seat that forms the locking protrusion and the inner peripheral side wall surface of the annular groove of the elastic valve body, which are opposed to each other with a gap in the radial direction of the elastic valve body, are curved curves corresponding to each other. The cross section has a shape and a curved concave cross section. Therefore, when the elastic valve body is elastically deformed so as to enter the fluid flow path when a syringe or the like is connected, the inner peripheral surface of the valve seat and the inner peripheral side wall surface of the annular groove of the elastic valve body that are opposed to each other with a gap therebetween Are in close contact with each other. Thereby, a clearance gap lose | disappears and the penetration | invasion of the chemical | medical solution etc. to a clearance gap itself can be prevented.

  In addition, the inner peripheral surface of the valve seat and the inner peripheral side wall surface of the annular groove of the elastic valve body that are opposed to each other with a gap between them have a curved convex section and a curved concave section corresponding to each other. Even when the elastic valve body is elastically deformed by connecting a syringe or the like, local stress and deformation concentration in the elastic valve body is avoided. Thereby, when a male connector such as a syringe is connected, elastic deformation in the elastic valve body is stably realized, and the male connector is inserted through the elastic valve body on the wide surface of the connection member including the valve seat. The part can be held stably. In addition, the durability of the elastic valve body is improved and the plastic deformation is suppressed, and there is a problem of the occurrence of a new gap due to repeated attachment and detachment of the male connector to and from the elastic valve body and the retention of chemicals and the like resulting therefrom. Can also be effectively prevented.

[Other aspects and effects of the present invention]
In the present invention having the above-described structural features, any one of the following aspects can be appropriately combined as necessary.

  For example, in the present invention, the cross-sectional length dimension of the inner peripheral side wall surface of the annular groove having the curved concave shape in the elastic valve body is the same as that of the valve seat having the curved convex shape in the opening member. A configuration adapted to the cross-sectional length dimension of the peripheral surface may be employed. In this way, when the elastic valve body is elastically deformed so as to enter the fluid flow path when a syringe or the like is mounted, the inner peripheral surface of the valve seat and the annular groove of the elastic valve body that are opposed to each other with the gap interposed therebetween. The peripheral side wall surface can be brought into contact with a higher degree of close contact, and the penetration of a chemical solution or the like into the gap can be more effectively prevented. The cross-sectional length dimension of the inner peripheral side wall surface of the annular groove and the cross-sectional length dimension of the inner peripheral surface of the valve seat are substantially the same to the extent that they can be in close contact with each other, taking into account the elastic deformation of the elastic valve element. It only has to be set to.

In the present invention, the opening member constituting the opening portion of the fluid flow path is provided with a cylindrical wall portion extending inwardly of the fluid flow path from the protruding portion of the valve seat, and the male connector to be connected is The structure in which the elastic valve body is brought into contact with the inner peripheral surface of the cylindrical wall portion by being inserted into the slit of the elastic valve body and the elastic valve body is pushed and expanded inward of the opening member. Can be employed. According to such a configuration, for example, when the distal end portion of the syringe is inserted into the elastic valve body and connected to the fluid flow path, the insertion end position of the syringe distal end portion is in contact (engagement) with the opening member. It is not prescribed | regulated but it can be prescribed | regulated in the state compressed by pinching | interposing an elastic valve body between the cylindrical wall parts of an opening member. Thereby, the front-end | tip part of a male connector can be stably hold | maintained via an elastic valve body, for example, and the reliability of the connection state with respect to the fluid flow path of a male connector can also be aimed at. In addition, since a large compressive force is reliably exerted on the elastic valve body when the male connector is connected, the stability and reliability of the sealing performance by the elastic valve body can be improved.

  Moreover, in this invention, the structure by which the at least one of the latching protrusion of a valve seat and the latching protrusion of an annular ring is made into the some protrusion shape parted by the circumferential direction may be employ | adopted. By making the locking projections into a plurality of protruding shapes, the locking force of the locking projections against the elastic valve body can be improved based on the stress acting on the elastic valve body, the concentration of elastic deformation, etc. I can do it. Accordingly, it is possible to reduce the size of the elastic valve body while preventing the problem of the elastic valve body falling off when the male connector is attached / detached.

  In the present invention, the opening member has a stepped cylindrical shape including a large diameter cylindrical portion and a small diameter cylindrical portion, and is fixed to a separate fluid flow path forming member in the large diameter cylindrical portion. A configuration in which a male screw part is formed on the outer peripheral surface of the small-diameter cylindrical part so that a luer lock type connector can be connected can be adopted.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  First, FIG. 1 and FIG. 2 show a three-way stopcock 10 that is a medical connector provided with a medical valve as one embodiment of the present invention. The three-way cock 10 has a structure in which a cock 14 as a flow path switching mechanism is attached to a holder 12 as a housing body. In the following description, the vertical direction means the vertical direction in FIG. 2 unless otherwise specified.

  The holder 12 is an integrally molded product having a hollow structure including a main body portion 16 having a substantially cylindrical shape and first to third three branch pipes 18, 20, 22 protruding from the outer periphery of the main body portion 16. . Each of the first to third branch pipes 18, 20, and 22 has a cylindrical shape with both ends in the axial direction opened, and one end in the axial direction is connected to the main body portion 16 so that the inside of the main body portion 16 is inside. The first and third branch openings 24, 26, and 28 communicate with the external space of the holder 12, which is communicated with the space and is modeled by a dotted line in FIG. 2. . Thereby, the internal flow paths connected to the first to third branch openings 24, 26 and 28 are formed by the internal spaces of the first to third branch pipes 18, 20 and 22, respectively. The first branch pipe 18 and the second branch pipe 20 are formed at opposing positions on the outer periphery of the main body portion 16. On the other hand, the third branch pipe 22 is formed on the outer periphery of the main body portion 16 at a position where the first branch pipe 18 and the second branch pipe 20 are equally spaced by 90 degrees.

  In the three-way cock 10 shown in FIGS. 1 and 2, a female luer cap 30 having an internal thread formed on the inner peripheral surface is detachably fixed to the first branch opening 24 in an extrapolated state. ing. Further, a lock adapter 32 having an internal thread formed on the inner peripheral surface of the second branch pipe 20 is locked so as not to be pulled out by a flange-like portion (not shown) formed on the second branch pipe 20 and is extrapolated. It is installed in a state. Further, a male luer cap 34 is detachably attached to the second branch opening 26 in an extrapolated state.

  A cock 14 is inserted into the main body 16 and is rotatable and liquid-tightly assembled. By rotating the cock 14, each internal portion formed by the internal space of the first to third branch pipes 18, 20, 22 and opened at the first to third branch openings 18, 20, 22 is provided. The flow path can be selectively communicated.

  The third branch opening 28 is provided with a mixed injection port 36 as a medical valve. 3 and 4 show the detailed structure of the mixed injection port 36. FIG. The mixed injection port 36 is configured to include a valve member 38 as an elastic valve body having a disk shape, a cylindrical mouth body 40 and an annular ring 42, and a valve is provided between the cylindrical mouth body 40 and the annular ring 42. The member 38 is sandwiched and assembled. In the present embodiment, an opening member including the cylindrical mouth body 40 and the annular ring 42 to which the valve member 38 is assembled is configured.

  The valve member 38 has a substantially disc shape as a whole, in which a central portion 44 having a substantially disc shape and an annular fixing portion 46 having a substantially annular shape surrounding the outer periphery of the central portion 44 are formed integrally. Has been. The valve member 38 is formed of an elastic material, and is made of a material selected from synthetic rubber such as isoprene rubber and silicone rubber, natural rubber, and thermoplastic elastomer in consideration of airtightness and resealability. It is formed by press molding or molding.

  A slit 48 penetrating in the thickness direction is formed in the central portion 44. Here, as the shape of the slit 48, for example, a linear shape or a cross shape is adopted. In the present embodiment, the central portion 44 passes through the center of the central portion 44 and does not reach the outer peripheral edge of the central portion 44. The linear shape extends in the radial direction. The slit 48 is formed by penetrating a sharp blade in the thickness direction of the molded valve member 38.

  On the other hand, the annular fixing portion 46 continuously extends in the circumferential direction with a certain substantially rectangular cross-sectional shape. The rectangular cross section has a larger axial dimension (vertical dimension in FIG. 4) than a radial dimension (horizontal dimension in FIG. 4). The axial dimension of the annular fixing portion 46 is smaller than the axial dimension of the central portion 44, and the axial upper end surface of the annular fixing portion 46 is inward of the axial upper end surface of the central portion 44 (see FIG. (Lower part of 4). As a result, when the annular ring 42 is assembled so as to be overlapped with the annular fixing portion 46 in the axial direction, the annular ring 42 is prevented from projecting outward from the axial upper end surface of the central portion 44.

  In addition, annular grooves 54 and 56 having a concave cross section and continuously extending over the entire circumference are formed in the outer peripheral portions of the inner surface 50 and the outer surface 52 of the valve member 38, respectively. The annular grooves 54 and 56 are formed at substantially equal positions in the radial direction of the valve member 38, and the annular constricted portion whose thickness is reduced by the annular grooves 54 and 56 is provided in the valve member 38. 58 is formed. Therefore, the valve member 38 in the present embodiment has a central portion 44 formed on the inner peripheral side of the constricted portion 58, and an annular fixing portion 46 formed on the outer peripheral side of the constricted portion 58, and these central portions 44. And the annular fixing portion 46 are connected to each other by a constricted portion 58. Further, the constricted portion 58 is formed at a position slightly closer to the inner surface 50 in the thickness direction of the valve member 38, and the central portion 44 of the valve member 38 has an outer surface 52 side closer to the inner surface 50 side than the constricted portion 58. Is also considered thick.

  Further, on the inner surface 50, a concave groove portion 60 that extends continuously over the entire circumference is formed inside the annular groove 54. In short, the inner peripheral wall surface of the annular groove 54 is constituted by the recessed groove portion 60. Further, the concave groove portion 60 has a constant cross-sectional shape of a curved concave shape and extends over the entire circumference in the circumferential direction, and opens toward the axially inner side (downward in FIG. 4) of the valve member 38. (See FIG. 11).

  The diameter of the valve member 38 is preferably set within a range of 5.0 to 6.5 mm. As shown in FIG. 14 described later, when the diameter of the valve member 38 is smaller than 5.0 mm, it is difficult to insert the luer tip 106 of the standard luer lock connector 104 whose outer diameter is unified to approximately 4.0 mm. On the other hand, if the diameter is larger than 6.5 mm, the outer diameter of the third branch opening 28 becomes large, and it becomes difficult to connect the female threaded portion 108 of the standard luer lock connector 104.

  The thickness dimension of the valve member 38 is preferably set within a range of 1.0 to 3.0 mm. If the thickness dimension of the valve member 38 is smaller than 1.0 mm, the sealing performance at the time of insertion of a male connector such as a syringe tip may be insufficient, while the thickness dimension is larger than 3.0 mm. This is because the insertion resistance of the male connector increases and the insertion operation may become difficult.

  Such a valve member 38 is supported by a cylindrical mouth body 40 as an opening member formed separately from the holder 12. The cylindrical mouth body 40 has a stepped cylindrical shape in which a large diameter cylindrical portion 62 and a small diameter cylindrical portion 64 are integrally formed. The inner diameter of the small-diameter cylindrical portion 64 is at least large enough to accommodate the valve member 38 on the opening 65 side (upper side in FIG. 4), and the resealed state of the slit 48 after the male connector is removed is stably expressed. As such, the outer diameter of the valve member 38 is preferably substantially equal.

  The cylindrical mouth body 40 is preferably formed of a material having a strength capable of reliably holding the valve member 38, and specifically, thermoplastic resins such as polypropylene, polyethylene, polycarbonate, polystyrene, and polyacetal are exemplified. Is done. The cylindrical mouth body 40 is molded from these materials by injection molding or the like.

  An annular protrusion 68 as a valve seat that protrudes inward in the radial direction is integrally formed at the inner peripheral edge of the opening 65 in the small diameter cylindrical portion 64. A locking projection 70 that projects outwardly in the opening direction of the small-diameter cylindrical portion 64 (upward in FIG. 4) is integrally formed. The locking protrusion 70 has a peripheral wall shape that is continuous over the entire circumference with a constant protrusion height.

  Here, the portion extending from the inner peripheral surface of the locking protrusion 70 to the inner peripheral surface of the annular protrusion 68 is in close contact with the valve member 38 because the concave groove portion 60 is formed in the inner surface 50 of the valve member 38. However, it is exposed to the internal space of the cylindrical mouth body 40 that forms the fluid flow path. In addition, the exposed surface corresponds to the concave groove section 60 formed in the valve member 38 with a curved concave cross section, and a contact inner peripheral surface 71 that extends over the entire circumference in the circumferential direction with a curved convex shape. It is said that.

  In the small-diameter cylindrical portion 64, the inner surface of the peripheral wall located axially inward from the projecting portion of the locking projection 70 is a cylindrical surface 73 that extends linearly inward in the axial direction with a substantially constant inner diameter dimension. Has been.

  As will be described later, when the distal end portion of the syringe or the like is inserted into the valve member 38, the valve member 38 that is elastically deformed toward the inside of the cylindrical mouth body 40 has a concave groove 60. The inner surface 50 of the central portion 44 abuts against the cylindrical surface 73 of the small-diameter cylindrical portion 64 while abutting against the abutting inner peripheral surface 71 of the stop projection 70 and the annular projection 68. Yes. At that time, since the shapes corresponding to each other are set on both surfaces that are in contact with each other, the respective contact surfaces are stably in contact with each other without a gap. .

  Further, the protrusion height dimension of the locking protrusion 70 is equal to or slightly larger than the groove depth dimension from the inner surface of the annular fixing portion 46 of the annular groove 54 formed on the inner surface 50 of the valve member 38. Preferably it is. Thereby, generation | occurrence | production of the clearance gap between the protrusion front-end | tip part of the latching protrusion 70 and the groove bottom part of the annular groove 54 of the valve member 38 is prevented.

  In addition, the annular protrusion 68 and the locking protrusion 70 form an annular fitting groove 72 extending over the entire circumference in the circumferential direction on the inner peripheral surface of the small diameter cylindrical portion 64. The fitting concave groove 72 opens toward the opening direction on the small diameter cylindrical portion 64 side of the cylindrical mouth body 40. The depth dimension of the fitting groove 72 is the projection height dimension of the locking projection 70 described above, and is equal to or slightly larger than the depth dimension of the annular groove 54 of the valve member 38. Further, the groove width dimension in the radial direction of the fitting concave groove 72 is the same as or slightly the same as the width dimension of the portion protruding inward (inner surface side) in the axial direction from the constricted portion 58 in the annular fixing portion 46 of the valve member 38. Has been made smaller. Thereby, the annular fixing portion 46 of the valve member 38 is brought into contact with the entire inner surface of the fitting groove 72 in a tight contact state, and a gap in the fitting groove 72 is prevented.

  Further, a male screw portion 74 into which a female screw portion 108 of the luer lock connector 104 described later is screwed is formed on the outer circumferential surface of the small diameter cylindrical portion 64. The male threaded portion 74 is preferably a female threaded portion of a luer lock connector defined by ISO 594 and having a thread crest diameter of 7.0 ± 0.2 mm and a thread root diameter of 8.0 ± 0.1 mm. It is considered as a double thread that can be connected.

  It should be noted that the outer diameter of the cylindrical mouth body 40 is a small diameter cylinder when the male threaded portion 74 is not formed as in the present embodiment in order to enable connection of a standard luer tip defined by ISO594. The outer diameter of the portion 64 is preferably set within a range of 6.0 to 7.0 mm. When the male screw portion 74 is formed as in the present embodiment, the small-diameter cylindrical portion 64 including the screw thread The outer diameter is preferably set within a range of 7.2 to 8.0 mm.

  Further, an annular ring 42 is fixed to the opening 65 of the small diameter cylindrical portion 64 in the cylindrical mouth body 40. 5 to 10 show a single ring 42. The annular ring 42 has a substantially annular shape with a through hole 75 formed in the center, and the outer diameter dimension thereof is substantially equal to the inner diameter dimension of the opening 65 in the small-diameter cylindrical portion 64, while the inner diameter dimension thereof. Is substantially equal to the diameter of the central portion 44 of the valve member 38. As the material of the annular ring 42, the same thermoplastic resin as that of the cylindrical mouth body 40 as described above is preferably used.

  An annular notch 77 that is continuous over the entire circumference is formed in the outer peripheral portion of the upper end surface 76 of the annular ring 42. On the other hand, a locking projection 80 that projects downward is integrally formed on the inner peripheral portion of the lower end surface 78 of the annular ring 42. In particular, the locking protrusion 80 in the present embodiment is divided in the circumferential direction, which is constituted by a plurality (eight in the present embodiment) of locking protrusions 81 having a substantially rectangular cross-sectional shape and partially extending in the circumferential direction. A plurality of protrusions are formed. In particular, in the present embodiment, the plurality of locking protrusions 81 are all formed with substantially the same shape, and are formed at substantially equal intervals in the circumferential direction of the annular ring 42.

  Here, the radial width dimension of the protruding end surface 82 of the locking projection 81 is the same as or slightly larger than the radial width dimension of the bottom surface of the annular groove 56 formed in the outer surface 52 of the valve member 38. The protruding height dimension of the stop projection 81 from the lower end surface 78 of the annular ring 42 is the same as or slightly larger than the protruding height dimension of the annular fixing portion 46 of the valve member 38 from the constricted portion 58. Thereby, the front-end | tip part of the latching protrusion 81 is contact | abutted in the contact | adherence state without a clearance gap with respect to the inner surface of the bottom part of the annular groove 56 of the valve member 38. FIG.

  Further, a plurality of (eight in the present embodiment) auxiliary peripheral walls 84 projecting downward are integrally formed between the locking protrusions 81 adjacent to each other in the circumferential direction of the annular ring 42. Here, the protruding dimension of the auxiliary peripheral wall 84 is made smaller than that of the locking protrusion 81. As a result, in the annular groove 56 of the valve member 38, in the portion where the auxiliary peripheral wall 84 enters and is engaged (that is, the portion where the locking projection 81 is not formed), the gap 96 is formed on the protruding front end side of the auxiliary peripheral wall 84. It comes to exist.

  Since the annular ring 42 is disposed on the outer peripheral portion excluding the central portion 44 of the valve member 38, the inner diameter dimension of the through hole 75 is set to 4.4 mm or more so as not to hinder the connection operation of the male connector. It is preferred that If the inner diameter dimension of the through hole 75 is smaller than 4.4 mm, when the standard luer lock connector specified by ISO594 is inserted, the luer tip and the annular ring 42 come into contact with each other and damage the luer tip. This is because airtightness may be impaired.

  Then, after the valve member 38 is inserted from the opening 65 on the small-diameter cylindrical portion 64 side of the cylindrical mouth body 40, the annular ring 42 is inserted from the opening 65 on the small-diameter cylindrical portion 64 side. An open end 92 of the body 40 is secured to the annular ring 42. Thereby, the annular fixing portion 46 of the valve member 38 is sandwiched by the annular protrusion 68 and the annular ring 42 of the cylindrical mouth body 40, and the cylindrical mouth body 40, the annular ring 42, and the valve member 38 are assembled to each other. Yes.

  In this assembled state, as shown in FIG. 11, the annular fixing portion 46 of the valve member 38 is fitted into the fitting concave groove 72, and the locking protrusion 70 formed on the cylindrical mouth body 40 is 38 is fitted in an annular groove 54 formed on the inner surface 50 of the plate 38. Then, in the annular ring 42 and the cylindrical mouth body 40 which are fixed to each other, the constricted portion 58 of the valve member 38 is axially formed by the locking projection 70 and the locking projection 81 which are provided so as to face each other. It is sandwiched between and supported.

  It should be noted that the fixation of the annular ring 42 to the cylindrical mouth body 40 is advantageously realized by, for example, swaging. Specifically, as shown in FIG. 12, first, after the valve member 38 is fitted into the cylindrical mouth body 40, the annular ring 42 is fitted into the cylindrical mouth body 40 from above the valve member 38. At this stage, the opening end portion 92 of the cylindrical mouth body 40 is not yet curved, and has a cylindrical shape extending in the axial direction. Next, as shown in FIG. 13 as a model, a horn 102 having a circular recess 100 having a curved surface 98 formed on the outer peripheral end portion is used to make an Swaging using sonic vibration or high frequency induction heating. Accordingly, the upper end portion of the cylindrical mouth body 40 is deformed radially inward while being melted, and is locked and fixed to the outer peripheral edge portion of the annular ring 42.

  Particularly in the present embodiment, the opening end 92 of the cylindrical mouth body 40 is bent so as to enter the annular notch 77 of the annular ring 42 and is locked to the annular ring 42, thereby The upper end surface and the upper end surface of the annular ring 42 are positioned on substantially the same plane. At the same time, the upper end surface of the annular ring 42 is positioned substantially on the same plane as the upper end surface of the valve member 38. Thereby, the upper end surface of the mixed injection port 36 is formed as a substantially single plane. In addition, as processing conditions suitable for such swaging processing, when ultrasonic vibration is used, the ultrasonic vibration frequency is set to about 20 to 40 Hz, the load during oscillation is set to about 10 to 100 N, and the open end It is preferable that the amount of depression of the cylindrical mouth body 40 that is the amount of depression of the portion 92 is 0.2 to 0.4 mm. Further, as a swaging process, for example, means such as high frequency induction heating can be used instead of ultrasonic vibration.

  The mixed injection port 36 is fixed by covering the large-diameter cylindrical portion 62 of the cylindrical mouth body 40 with the opening of the third branch pipe 22 in the holder 12. In the three-way stopcock 10 having such a structure, generally, the first branch opening 24 is connected to the tube on the upstream side of the infusion route, and the second branch opening 26 is connected to the tube on the downstream side. Thus, the first branch pipe 18 and the second branch pipe 20 constitute a part of the infusion route and are arranged on the infusion route.

  As shown in FIG. 14, for example, a luer lock connector 104 as a male connector is connected to the mixed injection port 36 provided in the third branch opening 28. 14A shows a state before the luer lock connector 104 is connected, and FIG. 14B shows a connection state of the luer lock connector 104. The luer lock connector 104 is a conventionally known one having a standard size defined by, for example, ISO 594. A luer tip 106 having a tapered cylindrical taper shape and forming an external flow path, and an outer peripheral portion of the luer tip 106 are provided. A surrounding female screw portion 108 is provided.

  The luer tip 106 is pushed into the valve member 38 while the female screw portion 108 and the male screw portion 74 of the mixed injection port 36 are screwed together. In the valve member 38, the annular fixing portion 46 is locked by the locking projection 70 and the locking projection 80. As a result, the central portion 44 of the valve member 38 is pushed inward of the cylindrical mouth body 40, and the slit 48 is expanded.

  As a result, as shown in FIG. 14B, the luer tip 106 penetrates the valve member 38, and the tip opening 110 is opened in the internal space of the cylindrical mouth body 40 and connected to the luer tip 106. For example, an internal space such as a syringe is in communication with the internal flow path of the third branch pipe 22 through the fluid flow path in the luer tip 106. At the same time, the threaded portion 108 of the luer lock connector 104 is screwed into the threaded portion 74 of the mixed injection port 36, so that the insertion state of the luer tip 106 is reliably maintained.

  In such a state that the luer tip 106 is inserted, the cock 14 is operated to bring the third branch pipe 22 and the second branch pipe 20 into communication, so that the liquid medicine filled in the syringe is mixedly injected onto the infusion route. It becomes possible. Then, after the mixed injection is completed and the luer tip 106 is removed, the central portion 44 is restored to the disk shape by the elastic restoring force of the valve member 38, and the slit 48 is closed in a substantially airtight manner.

  Therefore, in the mixed injection port 36 having the above-described structure, the concave groove portion 60 of the valve member 38, the locking protrusion 70 with which the valve member 38 abuts, and the contact inner peripheral surface 71 of the annular protrusion 68 are provided. Since the curved concave cross section and the curved convex cross section corresponding to each other are formed, they are stably brought into contact with each other in a close contact state, and the generation of a gap between the contact surfaces is prevented. Therefore, entry and retention of the chemical solution due to the occurrence of the gap can be effectively avoided.

  In addition, after the luer tip 106 has been extracted, the locking member 70 and the annular protrusion 68 are formed by the concave groove 60 formed in the valve member 38 in a state where the valve member 38 is elastically restored and the slit 48 is closed. A recess having a sufficiently large opening width is formed on the surface of the contact inner peripheral surface 71. Therefore, even if the chemical solution enters the concave groove portion 60, a sufficiently large gravity is applied as compared to the force that stops at the concave groove portion 60 due to the surface tension, and the chemical solution stays in the concave groove portion 60. Can be effectively avoided.

  Further, the stress generated in the valve member 38 due to the bending deformation when the luer tip 106 is inserted is dispersed by the curved concave cross section set in the concave groove portion 60. In addition, the valve member 38 and the locking protrusion 70 and the annular protrusion 68 with which the valve member 38 abuts are formed with a curved concave section and a curved convex section corresponding to each other. The effect of further dispersing stress and deformation is exhibited. Thereby, the fall of the durability resulting from the local effect | action of the stress in a valve member 38 or a deformation | transformation can be reduced.

  The valve member 38 is stretched and deformed by being pulled inward of the cylindrical mouth body 40 by frictional force when the luer tip 106 is inserted, so that the extension is taken into consideration as shown in FIG. Thus, the surface length of the recessed groove portion 60 in the free state before the luer tip 106 is inserted is set to be smaller than the surface lengths of the contact projection inner surface 71 of the locking projection 70 and the annular projection 68.

  Further, in the mixed injection port 36 of the present embodiment, when the luer tip 106 is inserted, the inner surface 50 of the central portion 44 of the valve member 38 abuts against the cylindrical surface 73 of the small diameter cylindrical portion 64, so that the lure The insertion end position of the chip 106 is defined. Therefore, compared with the case where the insertion end position of the luer tip 106 is defined by direct contact with the cylindrical mouth body 40 or the annular ring 42, the luer tip 106 is inserted into the valve member 38 at the insertion end position. Sufficient compression force can be exerted stably. As a result, the sealing effect by the valve member 38 can be stably obtained, and the reliability of the sealing performance of the fluid channel can be improved.

  14 illustrates a luer lock type connector having a female threaded portion 108 as a male connector, but a so-called luer slip type connector that does not have the female threaded portion 108 and includes only the luer tip 106 is also possible. Connectable. In particular, in the case of a luer slip type connector, the connection state of the luer tip is maintained only by the elastic restoring force of the valve member 38. Further, when only the luer slip type is targeted as the male connector, the stepped shape of the cylindrical mouth body 40 and the male screw portion 74 are not necessarily required.

  Further, in the three-way cock 10 of the present embodiment, the locking protrusion 80 provided on the annular ring 42 has a plurality of protruding shapes including a plurality of locking protrusions 81, so that the luer tip 106 is inserted. At this time, the locking fixing force with respect to the valve member 38 can be concentrated on each locking projection 81 provided intermittently in the circumferential direction. As a result, it is possible to stabilize a large locking holding force with respect to the valve member 38 and to reduce the radial width dimension of the annular fixing portion 46.

  That is, according to the three-way cock 10 according to the present embodiment, it is possible to reduce the diameter of the mixed injection port 36 while ensuring a strong fixing strength of the valve member 38 with an extremely simple configuration. As a result, it is possible to connect any of a standard luer lock type connector and a luer slip type connector without any special connector.

  Further, a gap 96 is formed in a portion of the annular groove 56 where the locking projection 81 is not fitted, and the clearance area is secured by the gap 96 when the valve member 38 is elastically deformed.

  Furthermore, in the connected state of the luer tip 106, the luer tip 106 is held only by the valve member 38 and is not in contact with the cylindrical mouth body 40 and the annular ring 42. As a result, it is possible to completely avoid the trouble that the resin scraped due to the luer tip 106 rubbing against the annular ring 42 or the like is mixed into the fluid flow path, and further improvement in hygiene is achieved. The

  As mentioned above, although one Embodiment of this invention has been described, this is an illustration to the last, Comprising: This invention is not limitedly interpreted by the specific description of this Embodiment.

  For example, in the above-described embodiment, the annular ring 42 including the locking protrusions 80 including the plurality of locking protrusions 81 is employed. However, in the present invention, such locking protrusions 80 are provided. The use of the annular ring 42 is not essential. You may employ | adopt the annular ring 42 of a fixed cross-sectional shape over a perimeter.

  In addition, the size of the groove portion 60 is set to such an extent that the liquid does not stay in the groove portion 60 due to the action of surface tension in consideration of the viscosity and specific gravity of the liquid used. In the present invention, the radial width dimension and depth dimension of the recessed groove portion 60 are not limitedly interpreted.

  Moreover, in the said embodiment, although the annular protrusion 68 was formed in the cylindrical mouth body 40, and the valve member 38 was supported by the cylindrical mouth body 40 formed separately from the holder 12, for example, a housing main body It is also possible to directly form a valve seat, and in the embodiment, a valve seat may be formed at the opening of the third branch pipe 22 in the holder 12.

  Moreover, in the said embodiment, although the application example of the medical valve according to this invention to the medical connector provided with the housing of the three-way cock was shown, this invention is employ | adopted as various conventionally well-known medical fluid flow paths. The present invention is applicable to a medical valve provided on a member having various housings. For example, as shown in FIGS. 15A and 15B, the present invention can be applied to the plug 112 and the T-shaped mixed injection tube 114.

  In addition, although not enumerated one by one, the present invention can be carried out in a mode to which various changes, modifications, improvements and the like are added based on the knowledge of those skilled in the art. It goes without saying that all are included in the scope of the present invention without departing from the spirit of the present invention.

The perspective view of the medical connector as one Embodiment of this invention. The front view of the medical connector. The perspective view of the mixed injection port provided in the medical connector. Sectional drawing of the mixed injection port. The top view of the cyclic | annular ring which comprises the mixed injection port. The side view of the annular ring. The bottom view of the annular ring. The perspective view of the annular ring. IX-IX sectional drawing in FIG. XX sectional drawing in FIG. The principal part expanded sectional view of the mixed injection port shown in FIG. The disassembled perspective view of the mixed injection port. Sectional model for demonstrating the manufacturing method of the mixed injection port. Sectional model figure for demonstrating the connection method of the mixed injection port. It is a perspective view of the medical connector as another embodiment of the present invention, and (a) shows a mixed injection plug and (b) shows a T-shaped mixed injection tube, respectively.

Explanation of symbols

10: Three-way stopcock, 12: Holder, 24: First branch opening, 26: Second branch opening, 28: Third branch opening, 36: Mixed injection port, 38: Valve member, 40: Tubular Mouth, 42: annular ring, 44: central portion, 46: annular fixing portion, 48: slit, 54: annular groove, 56: annular groove, 58: constricted portion, 60: concave groove portion, 68: annular protrusion, 70: locking projection, 71: contact inner peripheral surface, 80: locking projection, 81: locking projection

Claims (6)

  1. A disc-shaped elastic valve body having a slit formed in the central portion is attached to the opening member constituting the opening portion of the fluid flow path, and a male connector can be repeatedly inserted into and removed from the slit of the elastic valve body. a medical valve, which is,
    An annular groove extending in the circumferential direction is formed on both the inner and outer surfaces of the outer peripheral portion of the elastic valve body to provide an annular constricted portion, and the outer peripheral side of the elastic valve body is an annular fixed portion. On the other hand, a valve seat is formed so as to protrude to the inner peripheral side of the opening member, and an annular ring is assembled and fixed to the opening member from the opening side. The annular fixing portion of the elastic valve body is sandwiched and supported by the annular ring, and locking projections are formed to project from the valve seat and the inner peripheral edge of the annular ring. Stop protrusions are engaged with the annular grooves formed on both the inner and outer surfaces of the elastic valve body, and the inner peripheral surface of the valve seat on which the engagement protrusions are projected is curved and convex. The ring having a cross-sectional shape and formed on the inner surface of the elastic valve body The inward wall of the groove is a curved concave cross-sectional shape corresponding to the inner peripheral surface of the valve seat, the inner circumference of the annular groove of the elastic valve body to the inner peripheral surface of the valve seat Side wall surfaces are opposed to each other with a gap in the radial direction, and the male connector is inserted into the slit of the elastic valve body, whereby the inner peripheral side wall surface of the annular groove of the elastic valve body is the valve seat. A medical valve characterized in that it is in contact with and overlapped with the inner peripheral surface of the medical valve.
  2.   The inner peripheral surface of the valve seat in which the cross-sectional length dimension of the inner peripheral side wall surface of the annular groove having a curved concave shape in the elastic valve body is a curved convex sectional shape in the opening member. The medical valve according to claim 1, wherein the medical valve is adapted to a cross-sectional length dimension.
  3. The opening member is provided with a cylindrical wall portion extending inward of the fluid flow path from the protruding portion of the valve seat, and the male connector to be connected is inserted into the slit of the elastic valve body. The medical device according to claim 1 or 2, wherein the elastic valve body is brought into contact with the inner peripheral surface of the cylindrical wall portion by the elastic valve body being expanded inward of the opening member. Valve.
  4.   The at least one of the said locking protrusion of the said valve seat and the said locking protrusion of the said annular ring is made into the some protrusion shape parted in the circumferential direction. The medical valve according to 1.
  5.   The opening member has a stepped cylinder shape including a large-diameter cylindrical portion and a small-diameter cylindrical portion, and is fixed to a separate fluid flow path forming member in the large-diameter cylindrical portion. The medical valve as described in any one of Claims 1-4 in which the external thread part is formed in the outer peripheral surface of a part, and the luer lock type connector is connectable.
  6. The cross-sectional shape in which the inner peripheral side wall surface of the annular groove of the elastic valve body is curved toward the inner surface of the elastic valve body after spreading radially inward from the locking portion of the valve seat. The medical valve according to any one of claims 1 to 5.
JP2008331717A 2008-12-26 2008-12-26 Medical valve Active JP5372490B2 (en)

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JP2012200437A (en) * 2011-03-25 2012-10-22 Terumo Corp Multi-way cock and liquid medicine administration implement
WO2014162347A1 (en) 2013-04-01 2014-10-09 テルモ株式会社 Connector and transfusion set
JP6549347B2 (en) * 2013-08-23 2019-07-24 ニプロ株式会社 Medical valve
CN106163608B (en) 2014-03-26 2019-07-26 泰尔茂株式会社 Connector and infusion set
WO2015145936A1 (en) * 2014-03-28 2015-10-01 テルモ株式会社 Connector and infusion set

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JPH0621481Y2 (en) * 1990-05-22 1994-06-08 株式会社ニッショー Mouth of the infusion 溶器
JP2002078775A (en) * 2000-09-07 2002-03-19 Otsuka Pharmaceut Factory Inc Mouthpiece member for medical liquid container
JP2003104419A (en) * 2001-09-26 2003-04-09 Naigai Kasei Kk Cap for plastic container
US6908459B2 (en) * 2001-12-07 2005-06-21 Becton, Dickinson And Company Needleless luer access connector
JP4372736B2 (en) * 2004-09-14 2009-11-25 株式会社大協精工 Pharmaceutical container set, pharmaceutical container and rubber stopper
WO2006064753A1 (en) * 2004-12-13 2006-06-22 Jms.Co., Ltd Septum, needle-less port with the septum, and method of manufacturing the septum and the needle-less port

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