JP2016150063A - Medical valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a medical valve having novel structure that prevents a failure of an elastic valve body of falling-off to the housing inside.SOLUTION: A medical valve 10 is characterized as follows: a disc-shaped elastic valve body 16 is attached to an opening member 12 connected to a liquid flow path 102; a thin wall 70 formed in an outer peripheral portion of the elastic valve body 16 is sandwiched between claws 64 and 50 of the inside and outside of the opening member 12; also, an outer circumferential side of the thin wall 70 of the elastic valve body 16 is held by the opening member 12; and thereby, the outer peripheral portion of the elastic valve body 16 is supported by the opening member 12, and a male connector 100 can repeatedly be inserted to and removed from a slit 14 provided in a central portion 66 of the elastic valve body 16. A circumferential groove 90 extending in the circumferential direction on an inner circumferential side of the thin wall 70 in the inside surface of the elastic valve body 16 is formed of a depth larger than a bottom face 74 of the thin wall 70.SELECTED DRAWING: Figure 5

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 male connector, which is a medical connection tool 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, as a kind of medical valves such as such a medical connector, a split septum described in JP-T-2-502976 (Patent Document 1) and JP-A-2004-237133 (Patent Document 2). Types of medical valves are known. This medical valve has a structure in which a disk-like elastic valve body having a slit formed in the center portion is attached to an opening member of a housing 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.

  However, in the conventional structure in which the outer peripheral portion of the disk-shaped elastic valve body is sandwiched and supported by a pair of claw-shaped annular locking protrusions, the elastic valve body is caused by dimensional errors or assembly errors of parts. It is difficult to assemble with sufficient fixing force to the housing. In particular, when a male connector such as a large-diameter male luer is repeatedly inserted, the elastic valve body is pushed inward by a frictional force with the male luer or the like to be deformed. It has still been insufficient to prevent the outer peripheral portion from coming off the annular locking projection and falling off.

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

  Here, the present invention has been made in the background as described above, and the problem to be solved is a novel structure in which the failure of the elastic valve body to fall into the housing is prevented. It is to provide a medical valve.

  According to a first aspect of the present invention, a disk-shaped elastic valve body is attached to an opening member connected to a liquid flow path, and a thin portion formed on an outer peripheral portion of the elastic valve body is an inner side of the opening member. And the outer peripheral side of the thin portion of the elastic valve body is held by the opening member, so that the outer peripheral portion of the elastic valve body is supported by the opening member, and the elastic member In the medical valve in which the male connector can be repeatedly inserted and removed from the slit provided in the central portion of the valve body, the circumferential groove extending in the circumferential direction on the inner peripheral side of the thin portion on the inner side surface of the elastic valve body, It is characterized by being formed with a depth greater than the bottom surface of the thin portion.

  According to the medical valve having the structure according to the present aspect, the circumferential groove is provided on the outer peripheral side of the circumferential groove by providing the circumferential groove continuously extending in the circumferential direction on the inner surface of the elastic valve body. A relatively thin portion is formed as compared to the case where there is not. Therefore, when the male connector is inserted into the slit of the elastic valve body, the outer peripheral side portion of the circumferential groove is preferentially elastically deformed. In particular, since the circumferential groove is formed at a depth greater than the bottom surface of the thin portion formed in the outer peripheral portion of the elastic valve body, the length of the outer peripheral side portion of the circumferential groove and the elastic deformation amount are advantageously ensured advantageously. At the same time, when the male connector is inserted, the peripheral groove is also elastically deformed in the expanding direction, thereby reducing the resistance when the male connector is inserted. As a result, the male connector can be easily inserted into the elastic valve body, and the outer peripheral portion of the elastic valve body held by the opening member falls off to the inner peripheral side. Can be effectively prevented.

  In particular, in a medical valve having a conventional structure with no circumferential groove as described above, the pushing force of the male connector is concentrated on the thin portion of the elastic valve body, and the outer peripheral portion is stronger than the thin portion. When pulled, there is a possibility that the opening member may fall out from the inner and outer claws to the inner peripheral side. On the other hand, in the medical valve of this aspect, by forming a circumferential groove in the elastic valve body and providing a portion where elastic deformation is easily allowed, the pushing force exerted on the thin wall portion is reduced in a distributed manner. Since the holding state of the outer peripheral portion of the elastic valve body by the opening member is stably maintained, the elastic valve body can be effectively prevented from falling off the opening member.

  In the present invention, the circumferential groove provided on the inner surface of the elastic valve body does not have to be an annular groove continuously extending in an annular shape over the entire circumference in the circumferential direction, and is provided intermittently in the circumferential direction. Also good.

  According to a second aspect of the present invention, in the medical valve according to the first aspect, the wall thickness of the outer peripheral wall portion of the circumferential groove in the elastic valve body is thicker than the wall thickness of the thin portion. It is what has been.

  According to the medical valve structured according to this aspect, the wall thickness dimension of the outer peripheral end of the circumferential groove is thicker than the wall thickness dimension of the thin wall portion. The elastic restoring action by the elastic valve body can be exhibited stably. Thereby, a slit can be closed more reliably and the liquid flow path comprised including a medical valve can be interrupted | blocked more rapidly.

  According to a third aspect of the present invention, in the medical valve according to the first or second aspect, a wall surface on the outer peripheral side of the circumferential groove is inclined in a direction to expand inward. .

  According to the medical valve structured according to this aspect, since the wall surface on the outer circumferential side of the circumferential groove is inclined with respect to the axial direction, the portion on the outer circumferential side of the circumferential groove where elastic deformation is likely to occur in the elastic valve body. The substantial length of can be secured larger.

  According to a fourth aspect of the present invention, in the medical valve according to any one of the first to third aspects, the circumferential groove extends circumferentially along the thin portion in the circumferential direction. .

  According to the medical valve having a structure according to this aspect, the circumferential groove is formed in a circumferential shape along the thin portion in the circumferential direction, so that the elastic valve body changes from the wall portion on the outer peripheral side of the circumferential groove to the thin portion. The shape of the part to reach can be made substantially constant over the entire circumference in the circumferential direction. As a result, when the male connector is inserted, the stress and strain generated in the wall portion and the thin wall portion on the outer peripheral side of the circumferential groove are distributed substantially uniformly over the entire circumference in the circumferential direction. Further stabilization of the holding state of the body can be achieved.

  According to a fifth aspect of the present invention, in the medical valve according to any one of the first to fourth aspects, the circumferential groove is a slit.

  According to this aspect, for example, even in a small medical valve, the circumferential groove can be easily formed with high accuracy, and the above effects can be stably exhibited.

  According to a sixth aspect of the present invention, in the medical valve according to any one of the first to fifth aspects, the elastic valve body includes inner and outer surfaces extending in the circumferential direction on both the inner and outer surfaces of the outer peripheral portion. An annular groove is formed, the thin portion is formed between the bottom portions of the inner and outer annular grooves, and the inner and outer claw portions of the opening member are fitted into the annular grooves. is there.

  According to the medical valve having a structure according to this aspect, the elastic valve body can be more easily and reliably positioned with respect to the opening member by fitting the inner and outer claw portions of the opening member into the inner and outer annular grooves of the elastic valve body. It becomes possible to do.

  In the medical valve having the structure according to the present invention, the peripheral groove is provided on the inner side surface of the elastic valve body, so that the portion that is easily allowed to be elastically deformed when the male connector is inserted is not the inner periphery of the thin portion. Can be formed on the side. In addition, by providing a portion where this elastic deformation is easily allowed, the tensile force exerted on the thin wall portion when the male connector is inserted is reduced in a distributed manner, so that the elastic valve body can be effectively removed from the opening member. It becomes possible to prevent.

The perspective view of the medical valve as one Embodiment of this invention. The front view of the medical valve shown by FIG. The top view of the medical valve shown by FIG. IV-IV sectional drawing in FIG. Sectional drawing which expands and shows the principal part in FIG. Explanatory drawing for demonstrating the state in the middle of inserting a male connector with respect to the medical valve shown by FIG. Explanatory drawing for demonstrating the state which inserted the male connector to the deepest part with respect to the medical valve shown by FIG.

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

  First, FIGS. 1-5 shows the medical valve 10 as one embodiment of the present invention. The medical valve 10 has a structure in which a substantially disc-shaped elastic valve body 16 having a slit 14 is attached to a housing 12 as an opening member constituting an opening portion of a fluid flow path. The male connector can be repeatedly inserted into and removed from the slit 14 of the elastic valve body 16. In the following description, both the vertical direction and the outer / inner direction in the axial direction refer to the vertical direction in FIG.

  More specifically, the housing 12 has a generally cylindrical shape as a whole, and has a combined structure of three members each including an outer holding portion 18, an inner holding portion 20, and a housing body 22 each having a substantially cylindrical shape. It is configured. That is, in the present embodiment, the inner holding portion 20 is assembled without bonding to the upper portion of the housing main body 22, and the outer holding portion 18 is superimposed on the outer peripheral side of the inner holding portion 20, so that the housing main body 22 and the outer holding portion 18 are overlapped. Are fixed to form the housing 12.

  The housing main body 22 is configured by providing a peripheral wall portion 26 on the outer peripheral side of the central cylindrical portion 24 extending vertically in the axial direction, and connecting each upper end portion with an upper bottom portion 28. The axial dimension of the central cylindrical portion 24 is larger than the axial dimension of the peripheral wall portion 26, and the central cylindrical portion 24 projects downward from the peripheral wall portion 26 inside the peripheral wall portion 26.

  Further, an annular fixing groove 30 extending over the entire circumference in the circumferential direction is formed in the radial intermediate portion on the upper surface of the upper bottom portion 28, and is open to the upper surface of the upper bottom portion 28. The outer peripheral wall portion of the fixing groove 30 is an annular support wall 32 that positions the outer holding portion 18 and the inner holding portion 20 with respect to the housing body 22 in the radial direction. The opposing inner surfaces of the inner and outer walls of the fixing groove 30 are provided with a predetermined inclination angle, and the cross-sectional shape of the fixing groove 30 is gradually enlarged in the opening direction.

  Furthermore, a welding protrusion 34 protruding upward is integrally formed on the upper surface of the support wall 32. In addition, since this welding protrusion 34 is melt | dissolved with an ultrasonic wave in the case of the assembly | attachment with the outer side holding | maintenance part 18 and the housing main body 22, although it lose | disappears substantially in a product state, in FIG. For ease of explanation and understanding, the welding protrusion 34 is virtually illustrated by a broken line. Further, the welding protrusion 34 may be provided so as to be superimposed on the support wall 32 of the housing body 22 from the outer holding portion 18 side.

  Further, an annular stepped surface 36 extending in the direction perpendicular to the axis is formed on the outer peripheral surface near the upper end of the peripheral wall portion 26, while a concave portion 38 extending in the axial direction is formed below the stepped surface 36. A plurality are formed over the entire circumference in the circumferential direction. By providing unevenness on the outer peripheral surface with the plurality of recesses 38, the user can easily grasp the outer peripheral surface of the housing body 22 in the medical valve 10. On the other hand, a lock groove 40 is formed on the inner peripheral surface of the peripheral wall portion 26 so that a luer lock type connector or the like can be connected to the medical valve 10 from below.

  Above the housing main body 22 having the above-described structure, the outer holding portion 18 is assembled on the outer peripheral side, while the inner holding portion 20 is assembled on the inner peripheral side.

  The outer holding portion 18 has a structure in which a lower large-diameter cylindrical portion 42 and an upper small-diameter cylindrical portion 44 are integrally connected by a stepped annular shoulder 46 that expands in the radial direction. In other words, an annular shoulder 46 is provided in the axially intermediate portion of the outer holding portion 18, and the upper side of the annular shoulder 46 is a small diameter cylindrical portion 44, while the lower side is a large diameter cylindrical portion. 42. As will be understood from the description below, in this embodiment, the elastic valve body 16 is supported between the inner holding portion 20 and the small diameter cylindrical portion 44 and the annular shoulder portion 46 in the outer holding portion 18. The outer support portion 18 is supplementarily fixed to the housing body 22 by the large diameter cylindrical portion 42.

  Here, the inner peripheral surface and the outer peripheral surface of the small-diameter cylindrical portion 44 are tapered so that the diameter gradually decreases toward the outside in the axial direction. At the base end portion (lowermost portion) where the inner diameter dimension of the small diameter cylindrical portion 44 is maximum, the inner diameter dimension is smaller than the opening diameter of the outer peripheral side wall of the fixing groove 30 and the inner peripheral side wall of the fixing groove 30 is opened. It is larger than the caliber. On the other hand, at the distal end portion (uppermost portion) where the inner diameter dimension of the small diameter cylindrical portion 44 is minimum, the inner diameter dimension is substantially equal to or slightly larger than the outer diameter dimension of the elastic valve body 16.

  Further, the distal end portion of the small-diameter cylindrical portion 44 in the outer holding portion 18 is formed as an annular distal end wall portion 48 that bends toward the inner peripheral side, and the inner peripheral edge portion of the distal end wall portion 48 has an axially inner portion. An outer engaging claw 50 is formed as an outer claw portion extending downward so as to be folded back. In the present embodiment, the outer engagement claw 50 is formed in an annular shape over the entire circumference in the circumferential direction, and the outer engagement claw 50 extends in the circumferential direction with a predetermined width in the radial direction. The outer holding groove 52 is formed as an annular groove that opens downward in the axial direction.

  In addition, the external thread part 54 in which the internal thread part of a luer lock connector is screwed together is formed in the outer peripheral surface of the small diameter cylinder part 44, for example. The male threaded portion 54 is a double thread that can be connected to the female threaded portion of the luer lock connector, for example, as defined by ISO594.

  Further, the outer diameter of the outer holding portion 18 is set so that the outer diameter of the small diameter cylindrical portion 44 is 6.0 to 7.0 mm when the male screw portion 54 is not formed as in the present embodiment. In the case where the male screw portion 54 is formed as in the present embodiment, it is preferable that the outer diameter of the small-diameter cylindrical portion 44 including the thread is set within a range of 7.2 to 8.0 mm. .

  Further, a fitting groove 56 that opens downward is formed on the lower surface of the annular shoulder portion 46 of the outer holding portion 18. A locking projection 58 that protrudes downward in the axial direction is formed on the inner peripheral edge of the lower surface of the annular shoulder 46. In particular, in the present embodiment, the fitting groove 56 is an annular groove extending along the entire circumference in the circumferential direction, and the locking projection 58 is also an annular protrusion extending along the entire circumference in the circumferential direction.

  On the other hand, the inner holding portion 20 is formed into a tapered cylindrical shape having a smaller diameter as it goes from the inner side to the outer side in the axial direction as a whole, and the lower end portion of the inner holding portion 20 has a certain thickness dimension (in FIG. 4). It is an annular base end portion 60 extending to the outer peripheral side in the vertical direction). The annular base end portion 60 has a size and a shape that fits into the fixing groove 30 of the housing body 22, and an axial thickness dimension is smaller than a depth dimension of the fixing groove 30. .

  In addition, an annular seat portion 62 that narrows toward the inner peripheral side with a bend-shaped bent cross section is formed in the upper portion of the inner holding portion 20 in the axial direction. Further, an inner engagement claw 64 as an inner claw portion that protrudes upward in the axial direction is formed on the inner peripheral edge of the seat portion 62. The tip of the inner engagement claw 64 has a curved cross-sectional shape whose inner surface is convex toward the inner peripheral side, and the curved cross-sectional shape preferably has, for example, a substantially constant radius of curvature.

  The outer holding portion 18 and the inner holding portion 20 having such a structure are assembled to the housing main body 22, whereby the housing 12 is configured. That is, the inner holding portion 20 is attached to the housing main body 22 by overlapping the axially inner end surface of the inner holding portion 20 including the annular base end portion 60 on the bottom surface of the fixing groove 30 in the housing main body 22. It is supported.

  And the outer side holding | maintenance part 18 is provided so that it may cover with respect to this inner side holding | maintenance part 20 from an outer peripheral side. At that time, the bottom surface of the fitting groove 56 is overlapped and supported on the upper surface of the support wall 32 of the housing body 22 as an end surface of the small diameter cylindrical portion 44 on the proximal side in the axial direction. And the outer side holding | maintenance part 18 and the housing main body 22 are fixed by melting the welding protrusion 34 provided in the upper surface of the support wall 32 with an ultrasonic wave.

  Further, at the time of such assembly, the upper end in the axial direction of the outer holding portion 18 is positioned higher in the axial direction than the upper end in the axial direction of the inner holding portion 20. Further, the lower end in the axial direction of the outer holding portion 18 is overlapped with the stepped surface 36 of the housing body 22 with a slight separation distance in the axial direction.

  When the outer holding portion 18, the inner holding portion 20, and the housing main body 22 are assembled as described above, the axially inner end portion of the small diameter cylindrical portion 44 in the outer holding portion 18 with respect to the opening portion of the fixing groove 30 is It is fitted and fitted to the outer peripheral wall surface of the fixing groove 30. Thereby, in this embodiment, the inner holding | maintenance part 20 and the inner side edge part of the outer side holding | maintenance part 18 are each fitting with respect to the groove | channel 30 for fixation, Thereby, the inner side holding | maintenance part 20 and the outer side The holding portion 18 is positioned with respect to the housing body 22 in the radial direction.

  Further, at the time of such assembly, the seat portion 62 of the inner holding portion 20 is disposed substantially opposite to the distal end wall portion 48 of the outer engagement claw 50 in the axial direction. The inner engagement claw 64 of the inner holding portion 20 is opposed to the outer engagement claw 50 of the outer holding portion 18 with a gap in the axial direction. The inner engagement claws 64 and the outer engagement claws 50 are desirably at least partially overlapped with each other in the axial projection, and preferably overlap with each other in the axial projection in a region that is more than half of the radial direction. Is done. Particularly in the present embodiment, the curved surface that is the inner surface of the inner engagement claw 64 is positioned on the axial extension line of the inner peripheral end (radially inner end) of the outer engagement claw 50.

  Further, the outer diameter dimension of the inner holding part 20 is smaller than the inner diameter dimension of the outer holding part 18, and as shown in FIG. 4 and the like, a mounting space between the outer holding part 18 and the inner holding part 20. The elastic valve body 16 is attached to the.

  The elastic valve body 16 has a substantially disk shape, and a slit 14 is formed in the central portion 66. A cylindrical holding portion 68 that protrudes inward and outward in the axial direction is provided on the outer peripheral portion of the elastic valve body 16, and the outer peripheral surface of the cylindrical holding portion 68 is overlapped with the inner peripheral surface of the outer holding portion 18. On the other hand, the inner peripheral surface of the cylindrical holding portion 68 is overlapped with the outer peripheral surface of the inner holding portion 20. Furthermore, the elastic valve body 16 is formed as an integrally molded product by connecting the central portion 66 and the cylindrical holding portion 68 with an annular connecting portion 70 extending over the entire circumference. In other words, the cylindrical holding portion 68 is formed on the outer peripheral side of the annular coupling portion 70 in the outer peripheral portion of the elastic valve body 16.

  In the uninserted state of the male connector shown in FIG. 4, the upper end surface of the central portion 66 of the elastic valve body 16 and the upper end surface of the housing 12 are positioned on the same plane. In the present embodiment, the slits 14 are linearly penetrating in the thickness direction of the elastic valve body 16, but may be three or more slits extending radially from the center.

  The annular connecting portion 70 is formed by making the thickness dimension smaller than that of the central portion 66 of the elastic valve body 16, that is, the outer peripheral portion of the elastic valve body 16 on the outer side in the axial direction and on the inner surface side, respectively. A groove-shaped outer annular groove 72 and an inner annular groove 74 extending over the entire circumference in the circumferential direction are formed. These annular grooves 72 and 74 form a constriction on the outer peripheral portion of the elastic valve body 16, and this constricted portion, that is, an annular connecting portion 70 as a thin portion between the axial directions of the bottom portions of the annular grooves 72 and 74. It is said that.

  The annular grooves 72 and 74 have shapes substantially corresponding to the outer engaging claws 50 and the inner engaging claws 64, respectively, so that the inner and outer engaging claws 50 and 64 can be fitted thereinto. ing. Further, an annular concave groove 76 is provided on the inner circumferential side of the inner annular groove 74 and continuously extends in the circumferential direction with a predetermined radial width dimension, and the inner annular groove 74 and the annular concave groove 76 are in the radial direction. Are formed continuously.

  The cylindrical holding portion 68 connected to the outer peripheral side of the annular coupling portion 70 has a shape corresponding to the mounting space between the outer holding portion 18 and the inner holding portion 20. That is, in the present embodiment, the cylindrical holding portion 68 is configured including the upper support portion 78 projecting axially outward from the annular coupling portion 70 and the lower support portion 80 projecting axially inward.

  In short, the upper support portion 78 protrudes upward from the annular coupling portion 70 with a predetermined axial dimension, and the radial width dimension is substantially the same as or slightly larger than the radial width dimension of the outer holding groove 52. Further, the inner peripheral surface shape of the upper support portion 78 substantially corresponds to the outer peripheral surface shape of the outer engagement claw 50, while the outer peripheral surface shape of the upper support portion 78 substantially corresponds to the inner peripheral surface shape of the small diameter cylindrical portion 44. doing. Further, the lower support portion 80 protrudes downward from the annular coupling portion 70 with a predetermined axial dimension. In this embodiment, when the housing 12 and the elastic valve body 16 are assembled, the annular shoulder of the outer holding portion 18 is provided. Projecting to a position below the portion 46. And while the inner peripheral surface shape of the lower support portion 80 substantially corresponds to the outer peripheral surface shape of the inner holding portion 20, the outer peripheral surface shape of the lower support portion 80 corresponds to the inner peripheral surface shape of the small diameter cylindrical portion 44. Yes. Accordingly, the inner and outer peripheral surfaces of the lower support portion 80 are sandwiched and supported between the inner holding portion 20 and the small diameter cylindrical portion 44 in the outer holding portion 18 in the radial direction that is the thickness direction.

  In addition, the lower support portion 80 has a larger diameter dimension on the distal end side in the projecting direction (lower side in FIG. 4) than the proximal end side in the projecting direction (upward in FIG. 4), and the projecting distal end portion (the lowest end in the axial direction) Are integrally formed with a flange-like portion 82 as a radially projecting portion extending to the outer peripheral side. The radial width dimension of the flange-shaped portion 82 is substantially equal to the radial width dimension on the upper surface of the annular base end portion 60 of the inner holding portion 20. Further, on the upper surface of the flange-shaped portion 82, an upper locking recess 84 is formed that extends over the entire circumference in the circumferential direction at a position and size corresponding to the locking projection 58 of the outer holding portion 18. The outer peripheral side of the upper locking recess 84 is a locking projection 86 that protrudes outward in the axial direction. Furthermore, a lower locking recess 88 extending over the entire circumference in the circumferential direction is formed on the lower surface of the flange-shaped portion 82. For example, the lower locking recess 88 corresponds to the upper surface of the annular base end portion 60. By providing the convex portion, the effect of positioning the elastic valve body 16 on the inner holding portion 20 is exhibited, and the effect of preventing the elastic valve body 16 from falling off based on the friction of these uneven portions can be exhibited.

  Each of the outer holding portion 18, the inner holding portion 20, and the housing body 22 constituting the housing 12 of the present embodiment is preferably formed from a material having a strength capable of reliably holding the elastic valve body 16, A thermoplastic resin is preferably employed. The elastic valve body 16 is made of an elastic material, and is preferably made of synthetic rubber such as isoprene rubber or silicone rubber, natural rubber, thermoplastic elastomer, etc. in consideration of airtightness and resealability. Is done.

  Moreover, in the elastic valve body 16, the outer diameter dimension in the upper end part of the upper support part 78 is suitably set within a range of 5.0 to 6.5 mm. If the dimension is smaller than 5.0 mm, it may be difficult to insert a luer tip of a standard luer lock connector whose outer diameter is unified to approximately 4.0 mm, while the dimension is smaller than 6.5 mm. This is because if the diameter is large, the outer diameter of the medical valve 10 becomes large, and it may be difficult to connect to the female thread portion of a standard luer lock connector.

  The thickness dimension of the central portion 66 of the elastic valve body 16 is preferably set within a range of 1.0 to 3.0 mm. If the thickness dimension of the central portion 66 is smaller than 1.0 mm, the sealing performance at the time of insertion of the male connector such as the 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.

  Here, a circumferential groove 90 extending continuously with a predetermined radial width dimension is formed on the lower surface of the elastic valve body 16 over the entire circumference in the circumferential direction. The circumferential groove 90 is provided between the slit 14 and the annular coupling portion 70 in the radial direction, and the bottom surface 92 of the circumferential groove 90 is located above the lower surface of the annular coupling portion 70. In the present embodiment, the circumferential groove 90 is an annular concave groove. Further, the circumferential groove 90 is formed from the inner circumferential side end portion of the annular groove 76, and the inner circumferential wall surface of the annular groove 76 and the inner circumferential wall surface 94 of the circumferential groove 90 are formed as the same plane. ing. Furthermore, the outer peripheral side wall surface 96 of the circumferential groove 90 is an inclined surface that inclines linearly toward the inner peripheral side as it goes outward in the axial direction. Thereby, in this embodiment, the groove outer peripheral wall 98 which is a wall part of the outer peripheral side of the circumferential groove 90 is continuously from the annular coupling part 70 between the outer peripheral side wall surface 96 and the outer annular groove 72 of the circumferential groove 90. Is formed.

  The medical valve 10 according to this embodiment is configured by assembling the elastic valve body 16 having the above-described shape into the housing 12. That is, the annular base end portion 60 of the inner holding portion 20 is fitted into the fixing groove 30 formed at the opening side end portion of the housing body 22 so as to be non-adhered and positioned in the radial direction. Then, the flange-like portion 82 of the elastic valve body 16 is superimposed on the upper surface of the annular base end portion 60, and the inner engagement claw 64 of the inner holding portion 20 bites into the inner annular groove 74 of the elastic valve body 16. To be pushed into.

  In such a state, the outer holding portion 18 is overlapped from the outside in the axial direction, and the outer holding portion 18 is pressed against the housing body 22 in the axial direction as necessary. Accordingly, the upper support portion 78 of the cylindrical holding portion 68 is pushed into and supported by the outer holding groove 52 of the outer holding portion 18, and the outside of the outer holding portion 18 with respect to the outer annular groove 72 of the elastic valve body 16. The engaging claw 50 is pushed in so as to bite. Since the outer and inner annular grooves 72 and 74 are formed on the outer inner surface of the elastic valve body 16, the elastic valve body 16 and the outer and inner holding portions 18 and 20 are easily positioned and assembled with high accuracy.

  Further, the annular shoulder 46 of the outer holding portion 18 is overlapped with the welding projection 34 provided on the support wall 32 of the upper bottom portion 28 of the housing body 22 in a contact state. Then, while pressing the contact portion of the welding projection 34 in the axial direction, the horn of the ultrasonic welding apparatus is applied to cause the ultrasonic energy to act on the welding projection 34 in a concentrated manner. The contact portion is melted, the welding protrusion 34 is substantially melted and disappeared, and the fixing is completed in a state where the annular shoulder 46 of the outer holding portion 18 is superimposed on the upper bottom portion 28 of the housing body 22. In the ultrasonic welding, the housing main body 22 and the outer holding portion 18 are positioned in the axial direction because the contact area between the support wall 32 and the annular shoulder 46 suddenly increases as the welding projection 34 melts and disappears. Or the like.

  As a result, in the product state in which the ultrasonic welding is completed, the upper bottom surface of the fitting groove 56 provided in the annular shoulder 46 and the upper surface of the support wall 32 are substantially in contact with each other. In addition, a locking projection 58 provided on the inner surface of the outer holding portion 18 is fitted into and locked with an upper locking recess 84 provided in the elastic valve body 16, and the engagement of the elastic valve body 16 is also achieved. The stop protrusion 86 is fitted into the fixing groove 30 of the housing body 22 and is locked to the inner peripheral surface of the support wall 32.

  In addition, although the ultrasonic welding using the welding protrusion 34 as mentioned above is suitably employ | adopted for adhering with the upper bottom face of the fitting groove 56, and the upper surface of the support wall 32, for example, a welding protrusion is not used. Adhesion or the like may be used.

  Further, by pressing and fixing the outer holding portion 18 in the axial direction with respect to the housing main body 22, the inner holding portion 20 positioned inward in the axial direction of the outer holding portion 18 becomes the housing main body 22, the outer holding portion 18 and the like. These are non-adhered and are prevented from coming off and are fixedly assembled.

  Further, the lower support portion 80 of the cylindrical holding portion 68 is supported by being sandwiched between the outer holding portion 18 and the inner holding portion 20. Then, the locking projection 58 of the outer holding portion 18 is fitted into the upper locking recess 84 of the flange-shaped portion 82, and the outer holding portion 18 is pressed against the housing body 22 from the outside in the axial direction and fixed. By doing so, the flange-like portion 82 of the elastic valve body 16 is sandwiched and supported between the outer holding portion 18 and the annular base end portion 60 of the inner holding portion 20. That is, in this embodiment, the elastic valve body 16 is not bonded to the housing 12 and is positioned and fixed in the radial direction and the axial direction, and the cylindrical holding portion 68 has the outer holding portion 18 and the inner holding portion 20. , The outer peripheral portion of the elastic valve body 16 is supported by the housing 12.

  In the assembled state of the elastic valve body 16 to the housing 12, the bottom surface 92 of the circumferential groove 90 provided on the lower surface of the elastic valve body 16 is axially outer than the tip of the inner engagement claw 64, particularly in this embodiment. In the form, it is located on the outer side in the axial direction than the tip of the outer engagement claw 50.

  Here, in the elastic valve body 16 in the assembled state, the distance B (see FIG. 5) from the inner wall surface of the circumferential groove 90 to the outer engagement claw 50, that is, the wall thickness dimension B of the groove outer circumferential wall 98 is the outer inner ring. The wall thickness dimension A between the grooves 72 and 74 (see FIG. 5), that is, the axial dimension A of the annular connecting portion 70 is made larger. In the present embodiment, since the bottom surface 92 of the circumferential groove 90 is located on the outer side in the axial direction than the tip of the outer engagement claw 50, the distance B from the inner wall surface of the circumferential groove 90 to the outer engagement claw 50 is The distance from the outer peripheral side wall surface 96 of the circumferential groove 90 to the outer engagement claw 50 is set. Thus, by making the wall thickness dimension B larger than the wall thickness dimension A, the return of the elastic valve body 14 to the original shape by the elastic restoring action after the male connector is detached from the medical valve 10 can be achieved. Can be good. Also, from this, the thickness of the thin portion (annular connecting portion 70) described in the second aspect in the present invention is the same as that of the engagement claws 64, 50 inside and outside when the elastic valve body 16 is assembled to the housing 12. It is grasped as the wall thickness dimension in the state sandwiched between.

  In this embodiment, the wall thickness dimension B of the groove outer peripheral wall 98 in the assembled state is made larger than the axial dimension A of the annular coupling part 70, but the size of these dimensions is not limited in any way. is not. That is, as will be described later, when the male connector is inserted, the tensile stress or strain generated in the elastic valve body 16 is reduced or avoided from concentrating only on the annular coupling portion 70, and the tensile stress is also applied to the groove outer peripheral wall 98. It is preferable that the thickness dimension is set to such an extent that an effect of being generated by dispersing and strain is exhibited. Specifically, for example, the wall thickness dimension B of the groove outer peripheral wall 98 is preferably 50% to 200% of the wall thickness dimension A between the outer and inner annular grooves 72 and 74, and more preferably 80%. % To 150%. By setting the size of the distance B from the inner wall surface of the circumferential groove 90 to the outer engagement claw 50 within the above range, the effect of preventing the elastic valve body 16 from falling off the housing 12 described later can be stably exhibited.

  Further, FIG. 6 shows a state where the distal end portion of the syringe 100 as a male connector is inserted into the medical valve 10 having the above-described structure. That is, by inserting the distal end portion of the syringe 100 into the elastic valve body 16, the central portion 66 of the elastic valve body 16 is pushed inward in the axial direction and elastically deformed, and the slit 14 is opened. Thereby, the fluid flow path 102 from the inside of the syringe 100 to the inside of the human body through the inside of the medical valve 10 to the inside of the human body is brought into a communication state. In other words, when the syringe 100 is inserted into the elastic valve body 16 attached to the housing 12 constituting the opening portion of the fluid flow path 102, the slit 14 is opened and the fluid flow path 102 is brought into a communication state. The In FIG. 6, the syringe 100 is a luer lock type, and the female screw portion 104 provided in the syringe 100 is screwed with the male screw portion 54 provided in the housing 12. However, such a syringe may be a slip lock type.

  Here, since a groove outer peripheral wall 98 having a reduced thickness is formed in the central portion 66 of the elastic valve body 16, when the central portion 66 of the elastic valve body 16 is elastically deformed, a syringe is used. According to the pushing force of 100, the groove outer peripheral wall 98 is preferentially elastically deformed downward. Further, since the circumferential groove 90 is formed, the thickness of the portion of the elastic valve body 16 located above the circumferential groove 90 is reduced, and the elastic deformation of the portion is easily caused. A portion of the body 16 on the inner peripheral side with respect to the peripheral groove 90 is relatively less likely to undergo elastic deformation. As a result, when the distal end portion of the syringe 100 is inserted into the elastic valve body 16, the central portion 66 of the elastic valve body 16 has the inner peripheral side wall surface 94 of the circumferential groove 90 as shown in FIG. 6. And the outer peripheral side wall surface 96 are spaced apart from each other, and the portion positioned above the groove outer peripheral wall 98 and the peripheral wall 90 is elastically deformed downward, while the inner peripheral portion of the peripheral wall 90 is slid downward. It is designed to be elastically deformed.

  Then, as shown in FIG. 7, by inserting the syringe 100 further into the medical valve 10, the central portion 66 of the elastic valve body 16 enters between the inner holding portion 20 and the syringe 100. The deformation | transformation operation of the syringe 100 to the medical valve 10 is completed by deform | transforming.

  Thus, in the medical valve 10 of the present embodiment, the syringe 100 is provided by providing a portion that is elastically deformed preferentially in the central portion 66 of the elastic valve body 16 over a wide area continuously from the annular coupling portion 70. Since the insertion resistance of the syringe 100 is reduced and the syringe 100 can be inserted with a smaller pushing force, the elastic valve body 16 can be effectively prevented from falling off the housing 12 when the syringe 100 is inserted. In addition, since the syringe 100 can be inserted with a small pushing force, the tensile force exerted on the annular connecting portion 70 and the cylindrical holding portion 68 can be reduced, and the elastic valve body 16 is held by the housing 12. Can be maintained stably.

  Further, by making the wall thickness dimension A of the annular connecting portion 70 and the wall thickness dimension B of the groove outer peripheral wall 98 substantially equal, the stress and strain associated with the pushing force of the syringe 100 can be reduced with the annular connecting portion 70 and the groove outer peripheral wall 98. Can be distributed approximately equally. As a result, the elastic valve body 16 is more effectively removed when the load in the pulling direction is concentrated on the annular connecting portion 70 and the cylindrical holding portion 68 falls out between the outer and inner engaging claws 50 and 64. Can be prevented. In addition, by making the wall thickness dimension B larger than the wall thickness dimension A, the stress and strain associated with the pushing force of the syringe 100 can be reduced as compared with the conventional case, and the syringe 100 is detached from the medical valve 10. The return property of the elastic valve body 14 by the elastic restoring action later can be improved.

  In particular, the peripheral groove 90 is formed on the lower surface of the elastic valve body 16 instead of newly providing a portion that is easily preferentially elastically deformed as described above and can disperse the tensile stress and strain exerted on the annular coupling portion 70. By doing so, the groove outer peripheral wall 98 of the peripheral groove 90 is preferentially easily elastically deformed, and can be efficiently used as a portion where the tensile stress and strain are dispersed, so the size of the elastic valve body is increased. Without preventing, the elastic valve body 16 can be prevented from falling off.

  Further, in this embodiment, since the outer peripheral side wall surface 96 of the peripheral groove 90 is an inclined surface, the length of the outer peripheral wall 98 of the groove can be secured large, and the tensile force exerted on the annular connecting portion 70 Can be further reduced. Therefore, the possibility that the elastic valve body 16 is dropped from the housing 12 can be further reduced.

  Furthermore, in this embodiment, since the circumferential groove 90 is provided in an annular shape corresponding to the disk-like elastic valve body 16, the elastic deformation of the elastic valve body 16 as described above extends over the entire circumference in the circumferential direction. This can be realized stably, and the insertion resistance of the syringe 100 can be further reduced.

  In the present embodiment, the inner peripheral surface of the distal end portion of the inner engagement claw 64 has an inwardly curved curved section, and the inner proximal end surface of the groove outer peripheral wall 98 and the inner peripheral surface of the distal end portion of the inner engagement claw 64. Are superimposed on an inclined surface extending obliquely upward. Thereby, the improvement of the positioning accuracy at the time of the assembly | attachment of the elastic valve body 16 and the inner side holding | maintenance part 20 etc. can be achieved.

  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-described embodiment, the lower support portion 80 of the cylindrical holding portion 68 extends below the annular shoulder portion 46 of the outer holding portion 18, but is not limited to this mode. That is, the lower support portion 80 only needs to extend below the annular coupling portion 70 in the assembled state of the elastic valve body 16 to the housing 12. Thereby, since the axial direction dimension of the cylindrical holding part 68 is made larger than the opposing distance of the outer and inner engaging claws 50 and 64, the elastic valve body 16 is inserted when the syringe 100 is inserted into the elastic valve body 16. The effect of preventing the detachment from the housing 12 can be sufficiently exerted.

  However, in the state before the elastic valve body 16 is assembled to the housing 12, the axial dimension of the cylindrical holding portion may be equal to that of the annular coupling portion. That is, when the elastic valve body 16 is assembled to the housing 12, the annular connecting portion is compressed in the axial direction by the outer and inner engaging claws 50 and 64, so that the axial dimension of the cylindrical holding portion is the same as that of the annular connecting portion. You may make it become larger than an axial direction dimension. That is, in the present invention, the outer and inner annular grooves 72 and 74 provided on the outer inner surface of the elastic valve body 16 are not essential.

  In the above embodiment, the bottom surface 92 of the circumferential groove 90 is located axially outward from the tip of the outer engagement claw 50, but the bottom surface 92 of the circumferential groove 90 is more than the lower surface of the annular coupling portion 70. It only needs to be above, and does not have to reach the upper end of the outer engagement pawl 50.

  Further, the shape of the lower support portion 80 in the cylindrical holding portion 68 is not limited in any way. For example, the inner peripheral surface of the intermediate portion in the axial direction of the lower support portion 80 has a straight shape in which the inner diameter dimension is substantially constant. In addition, a rib that protrudes to the inner circumference side of the entire circumference or partially in the circumferential direction is provided on the inner surface of the lower end portion of the lower support portion 80 so that the outer diameter of the upper support portion 78 in the cylindrical holding portion 68 is increased. In comparison, it is preferable that the inner diameter dimension of the lower support portion 80 is reduced. Thereby, at the time of manufacturing the elastic valve body 16, the problem that the upper end portion of the elastic valve body 16 enters the lower opening of the cylindrical holding portion 68 and a plurality of elastic valve bodies are stacked to make the handling troublesome is avoided. Can be done.

  Furthermore, in the above embodiment, the inner peripheral side wall surface 94 of the circumferential groove 90 is formed to be flush with the inner peripheral side wall surface of the annular concave groove 76. The inner circumferential side surface or the outer circumferential side of the annular concave groove 76 may be provided. In the above embodiment, the circumferential groove 90 is provided in communication with the inner annular groove 74 and the annular concave groove 76, but may be provided independently of these. However, in the present invention, the annular groove 76 is not essential.

  Further, for example, the annular groove 76 is formed with a predetermined width in the radial direction, and the circumferential groove 90 is formed so as to open to the inner circumferential portion of the bottom surface of the annular groove 76, while the outer circumferential portion of the annular groove 76 is formed. It is also possible to constitute the thin portion 70 sandwiched between the inner and outer claw portions 64 and 50 by the bottom wall portion. At this time, the inner annular groove 74 may be formed so as to open to the bottom surface of the outer peripheral portion of the annular groove 76, but the inner annular groove 74 is not necessarily provided. That is, the claw portion 64 is pressed against the flat bottom surface of the outer peripheral portion of the annular groove 76 and the bottom wall portion of the annular groove 76 is elastically deformed, so that the claw portion 64 is substantially bitten. In addition, it is possible to realize a clamping action similar to the state of being locked to the inner annular groove 74.

  In addition, the circumferential groove is preferably an annular shape corresponding to the outer shape of the disc-shaped elastic valve element, but it only needs to extend continuously over the entire circumference in the circumferential direction. For example, it may be elliptical or polygonal in plan view.

  Furthermore, in the above-described embodiment, the circumferential groove 90 has a predetermined radial width dimension, but the circumferential groove may be a slit-like slit whose radial width dimension is substantially zero. In addition, when employ | adopting a slit as a surrounding groove, it is possible to make the outer peripheral side wall surface of a slit into an inclined surface by forming a slit inclining with respect to an axial direction. Such a slit can be formed, for example, by inserting a cutter knife or the like after forming the elastic valve body and making a cut.

  Further, the shape of the housing 12 is not limited in any way. For example, in the above-described embodiment, the inner holding portion 20 and the housing main body 22 are separate components, but may be integrally formed. Furthermore, like a medical valve described in JP 2010-148757 A, for example, a locking projection ( The housing may be configured by fixing an annular ring (42) comprising 80).

  Furthermore, in the above-described embodiment, the outer peripheral side wall surface 96 of the circumferential groove 90 is a linear inclined surface that is inclined at a constant inclination angle with respect to the axial direction. However, even if the inclination angle changes. For example, the outer peripheral side wall surface of the circumferential groove may be formed of a bent surface or a curved surface.

  In the embodiment described above, the outer and inner engaging claws 50 and 64 and the outer and inner annular grooves 72 and 74 are formed in an annular shape over the entire circumference in the circumferential direction. May be formed intermittently in the circumferential direction, and the height of the engaging claws can be changed stepwise or continuously on the circumference. Also, the outer and inner annular grooves may be formed intermittently corresponding to the position and size of the outer and inner engaging claws.

  Moreover, in the said embodiment, although the circumferential groove 90 was made into the annular groove continuously extended over the perimeter in the circumferential direction, it is not limited to this aspect. That is, the circumferential groove provided on the inner surface of the elastic valve body may be provided intermittently in the circumferential direction. In addition, when a slit like the said embodiment is provided in an elastic valve body, the deformation | transformation aspect in the outer peripheral part of an elastic valve body changes according to the extending direction of a slit. Therefore, for example, when the slit as in the above-described embodiment is formed in a single letter shape, a circumferential groove extending at a length equal to or less than a half circumference in the circumferential direction is provided on each of the outer circumferential portions on both sides in the direction orthogonal to the slit extending direction. Is preferred. As a result, in the elastic valve body of the conventional structure having no circumferential groove, the deformation strain is easily increased, and the effective length of the deformed portion is increased by the formation of the circumferential groove at the both sides in the direction perpendicular to the slit, and the deformation is easily allowed. Thus, the insertion resistance can be reduced and the durability can be improved. However, in the present invention, in the elastic valve body, in addition to or instead of the both sides in the slit orthogonal direction, circumferential grooves extending at a length equal to or less than a half circumference in the circumferential direction may be provided in the portions located on the outer circumference side of both ends of the slit. Is possible.

  Moreover, as a slit provided in an elastic valve body, aspects, such as a cross shape and radial form other than one character shape, are also employable. Also in these cases, a circumferential groove partially extending at a predetermined position on the circumference may be formed in consideration of the deformation mode of the elastic valve body that differs on the circumference. Furthermore, the cross-sectional shape such as the depth of the circumferential groove and the opening width can be appropriately changed in consideration of the deformation of the outer peripheral portion of the elastic valve body being different in the circumferential direction.

10: Medical valve, 12: Housing (opening member), 14: Slit, 16: Elastic valve body, 50: Outer engagement claw (claw part), 64: Inner engagement claw (claw part), 66: Center part 68: cylindrical holding part, 70: annular connecting part (thin part), 72: outer annular groove, 74: inner annular groove, 90: circumferential groove, 96: outer peripheral side wall surface, 98: groove outer peripheral wall, 100: syringe , 102: fluid flow path

Claims (5)

A disk-shaped elastic valve body is mounted on the opening member connected to the liquid flow path, and a thin portion formed on the outer peripheral portion of the elastic valve body is sandwiched between the inner and outer claws of the opening member. The outer peripheral side of the thin portion of the elastic valve body is held by the opening member, so that the outer peripheral portion of the elastic valve body is supported by the opening member and provided at the central portion of the elastic valve body. In the medical valve where male connector can be repeatedly inserted and removed from the slit,
A medical valve characterized in that a circumferential groove extending in the circumferential direction on the inner peripheral side of the thin portion on the inner surface of the elastic valve body is formed with a depth greater than the bottom surface of the thin portion.   2. The medical valve according to claim 1, wherein a wall thickness of an outer peripheral wall of the circumferential groove in the elastic valve body is thicker than a wall thickness of the thin wall.   The medical valve according to claim 1 or 2, wherein a wall surface on an outer peripheral side of the circumferential groove is inclined in a direction of expanding inward.   The medical valve according to any one of claims 1 to 3, wherein the circumferential groove extends circumferentially in the circumferential direction along the thin portion.   The medical valve according to any one of claims 1 to 4, wherein the circumferential groove is a slit-like slit.

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