JP2020069360A - Medical valve - Google Patents

Abstract

To provide a novel-structure medical valve reducing damage of an elastic valve element caused by insertion of a needleless-type male connector.SOLUTION: A medical valve 10 includes a port 14 for male connector connection, equipped with a disk-shaped elastic valve element 16, and is supported by locking an inner pawl part 62 and an outer pawl part 78 formed at a housing 12, to an inner locking groove 26 and outer locking groove 28 formed at an outer peripheral part of the elastic valve body 16. A cylindrical inner peripheral surface 81 having an inside diameter of 3.9-4.5 mm and the axial length of 1/3 or more of that of the outer pawl part is formed at an axially-outward end portion in an inner peripheral surface 78a of the outer pawl part 78 that is superposed on the outer locking groove 28 of the elastic valve element 16, where the inside diameter dimension of the inner peripheral surface 64c of the inner pawl part 62 superposed on the inner locking groove 26 of the elastic valve element 16 is formed larger than the inside diameter dimension of the cylindrical inner peripheral surface 81 in the outer pawl part 78.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a medical valve capable of connecting a needleless connector such as a male luer of a syringe.

  In the medical field, in a fluid flow path for performing infusion or blood collection, a medical valve is used to enable connection of a needleless type male connector in a medical device such as a syringe, if necessary. As a kind of such a medical valve, for example, a split septum type medical valve described in WO 2015/156272 (Patent Document 1) is known.

  By the way, in a split septum type medical valve, it is necessary to fix the elastic valve body to the housing so that the elastic valve body does not come off when the male connector is attached or detached. Therefore, as shown in Patent Document 1, the inner and outer claw portions formed on the housing are locked and supported by the inner and outer locking grooves formed on the outer peripheral portion of the elastic valve body. A structure is proposed.

International Publication No. 2015/156272

  However, in the medical valve having the conventional structure as described above, when the male connector is inserted, a crack occurs around the thin portion sandwiched between the inner claw portion and the tip of the male connector in the elastic valve body. Then, the elastic valve body may be damaged.

  It is an object of the present invention to provide a medical valve having a novel structure in which damage to the elastic valve body due to insertion of a needleless type male connector is reduced.

  Hereinafter, embodiments of the present invention made to solve such problems will be described. The constituent elements used in each of the following aspects can be used in any combination as much as possible.

  First, as a result of repeated experiments and studies on the cause of damage to the elastic valve body in the medical valve having the conventional structure, the present inventor has obtained new problems or findings regarding new facts and the cause of damage. That is, when inserting the male connector into the medical valve, the user unknowingly tilts the male connector to insert the male connector by aligning the tip of the male connector into the central portion of the elastic valve body. It was found that the tip of the connector was inserted into the elastic valve body. In short, it is difficult to hit the tip of the male connector in the vertical direction by pinpointing the center of the elastic valve body, and the outer peripheral surface near the tip of the male connector contacts the tip surface of the wall around the elastic valve body. By doing so, the distal end surface of the wall around the elastic valve element is often used as a guide to guide and insert the distal end of the male connector to the center of the elastic valve element.

  As a result, the male connector inserted diagonally has its tip end pressed locally against the elastic valve body, and the deformed elastic valve body is strongly pinched between the outer and inner claws of the housing. The tip of the male connector will move in a squeezing manner. Therefore, a mechanism and a technical problem that a large force locally acts on the elastic valve body and damage such as cracking of the elastic valve body is likely to occur have been found.

  According to a first aspect of the present invention, a port for connecting a male connector to which a disc-shaped elastic valve body is mounted is provided, and an inner locking groove and an outer engagement groove formed in an outer peripheral portion of the elastic valve body are provided. In a medical valve in which an inner claw portion and an outer claw portion formed in a housing are engaged with and supported by a stop groove, in the outer claw portion of the elastic valve body, the outer claw portion being overlapped with the outer claw portion. A cylindrical inner peripheral surface having an inner diameter of 3.9 to 4.5 mm and an axial length of ⅓ or more of the outer claw portion is formed at an axial outer end portion of the inner peripheral surface. In addition, the inner diameter of the inner peripheral surface of the inner claw portion superposed on the inner locking groove of the elastic valve body is made larger than the inner diameter dimension of the cylindrical inner peripheral surface of the outer claw portion. It is characterized by being present.

  According to the medical valve having the structure according to the present aspect, the outer claw portion and the inner claw portion that hold the elastic valve body are set to have a specific size and shape, thereby preventing an excessive inclination when the male connector is inserted. At the same time, the strength of the portion of the elastic valve body that is deformed by receiving a force from the male connector can be improved, and stress concentration and therefore damage of the elastic valve body when inserting the male connector can be reduced.

  According to a second aspect of the present invention, a port for connecting a male connector to which a disc-shaped elastic valve body is mounted is provided, and an inner locking groove and an outer engagement groove formed in an outer peripheral portion of the elastic valve body are provided. In a medical valve in which an inner claw portion and an outer claw portion formed in a housing are engaged with and supported by a stop groove, an inner side surface of the elastic valve body is continuous with the inner engagement groove. While a peripheral groove that widens to the peripheral side is provided, an inclined surface that gradually increases in diameter in the axial direction is provided on the inner peripheral surface of the outer claw portion, and the inclination angle θ of the inclined surface is Is greater than 45 degrees, and at least a part of the circumferential groove in the radial direction is axially opposed to the inclined surface of the outer claw portion.

  According to the medical valve having the structure according to this aspect, the free surface of the elastic valve body is increased by the circumferential groove, so that stress concentration at the time of deformation of the elastic valve body due to insertion of the male connector is reduced. Further, since the outer claw portion axially opposed to the circumferential groove is provided with the inclined surface, the axial thickness of the elastic valve body is secured even in the portion where the circumferential groove is formed, and the durability can be secured. In addition, the compression force exerted on the elastic valve body when the male connector is inserted is released in the direction along the inclined surface of the outer pawl portion, so that the generated stress can be dispersed.

  A third aspect of the present invention is the medical valve according to the second aspect, wherein the circumferential groove of the elastic valve body extends radially inward from the inner circumferential surface of the outer claw portion. It is a thing.

  In the medical valve having the structure according to the present aspect, the inward elastic deformation of the elastic valve body due to the insertion of the male connector is more easily allowed by the circumferential groove, and the generated stress of the elastic valve body is more effective. Can be mitigated.

  According to a fourth aspect of the present invention, a port for connecting a male connector to which a disk-shaped elastic valve body is mounted is provided, and an inner locking groove and an outer engagement groove formed in an outer peripheral portion of the elastic valve body. A medical valve in which an inner claw part and an outer claw part formed in a housing are engaged with and supported by a stop groove, wherein the outer claw part and the inner claw part are provided at an outer peripheral portion of the elastic valve body. The first thin-walled portion having the minimum thickness is formed between the opposing surfaces of the most distal surfaces of the inner locking groove at the inner peripheral side of the first thin-walled portion. A second thin-walled portion that gradually becomes thicker toward the center is provided by the inner peripheral surface that is inclined to the end, and further, on the inner peripheral side of the second thin-walled portion, the inclined inner portion of the outer claw portion is provided. It is characterized in that a third thin portion is formed by the peripheral surface, which gradually becomes thicker toward the center. It is intended.

  According to the medical valve having the structure according to the present aspect, the supporting action between the inner and outer claw portions is exerted on the thinnest first thin-walled portion, and the elastic valve body does not fall off when the male connector is inserted. To be prevented. Further, since the elastic valve body is easily deformed at the time of inserting the male connector in the relatively thin second thin portion, the insertion of the male connector is allowed while suppressing the generated stress. .. Furthermore, since the third thin-walled portion, which is thicker than the second thin-walled portion, is provided on the inner peripheral side closer to the male connector than the second thin-walled portion, ironing during insertion of the male connector, etc. The durability of the elastic valve body with respect to is improved.

  As a result, it is possible to achieve both improvement in insertion operability of the male connector due to easiness of deformation of the elastic valve element and improvement in durability of the elastic valve element. It should be noted that it is desirable that the most distal surfaces of the outer claw portion and the inner claw portion be flat surfaces having a slight width dimension in the radial direction, so that concentrated force exerted on the elastic valve body is exerted. Will be reduced. However, in the present invention, the most distal surfaces of the inner and outer claw portions may extend in the circumferential direction in a thin line shape having substantially no width. For example, the most distal surfaces having a sharpened shape or a curved cross-sectional shape in appearance are also included. Can be adopted.

  A fifth aspect of the present invention is the medical valve according to the fourth aspect, wherein the outer claw portion is compared with the axial facing distance between the most distal end surfaces of the outer claw portion and the inner claw portion. The dimensional difference between the inner radius of the most distal end face and the inner radius of the most distal end face of the inner claw portion is smaller.

  In the medical valve having the structure according to the present aspect, the most distal end surface of the outer claw portion extends beyond the sandwiching region of the elastic valve body between the opposing surfaces of the inner claw portion and the inner claw portion. The size is suppressed. As a result, while securing the clamping action of the elastic valve body by the inner and outer claws, the deformation constraint of the elastic valve body by the outer claws is reduced, improving the operability of inserting the male connector into the elastic valve body. Can be done.

  A sixth aspect of the present invention is to provide a port for connecting a male connector to which a disc-shaped elastic valve body is mounted, and to provide an inner locking groove and an outer engagement groove formed in an outer peripheral portion of the elastic valve body. A medical valve in which an inner claw portion and an outer claw portion formed in a housing are engaged with and supported by a stop groove, and the medical valve is fitted and locked in the inner engagement groove of the elastic valve body. In the tip portion of the inner claw portion, the tip end surface is biased to the outer peripheral side with respect to the radial center of the tip portion, and the minimum inner diameter of the tip portion of the inner claw portion is the outer claw portion. It is characterized in that it is made larger than the inner diameter of the most advanced surface.

  According to the medical valve having the structure according to the present aspect, the elastic valve element is supported on the outer peripheral side of the tip portion of the inner claw portion, while the thickness of the elastic valve element is supported on the inner peripheral side of the tip portion of the inner claw portion. The dimensions can be increased. As a result, it is possible to secure the supporting force for the elastic valve body, allow the elastic valve body to deform when the male connector is inserted, and reduce the stress of the elastic valve body and prevent the damage.

  A seventh aspect of the present invention is the medical valve according to the sixth aspect, wherein the inner peripheral surface of the inner claw portion has a curved inner peripheral surface having a curved cross-sectional shape that is convex toward the inner peripheral side. The curved inner peripheral surface extends further inward than the tip portion, and the elastic valve body is deformed so as to overlap the curved inner peripheral surface by the connection of the male connector. It is a thing.

  According to the medical valve having the structure according to this aspect, the elastic valve body deformed by the connection of the male connector can be smoothly deformed along the curved inner peripheral surface of the inner claw portion having the curved cross-sectional shape. ..

  According to an eighth aspect of the present invention, a port for connecting a male connector, in which a disk-shaped elastic valve body is mounted, is provided, and an inner locking groove and an outer engagement groove formed in an outer peripheral portion of the elastic valve body are provided. In a medical valve in which an inner claw portion and an outer claw portion formed on a housing are engaged with and supported by a stop groove, an inner peripheral surface of the inner claw portion is convex toward an inner peripheral side. The curved inner peripheral surface has a curved cross-sectional shape, and the curved inner peripheral surface extends and extends to the outside of the inner locking groove of the elastic valve body, and the minimum inner diameter of the curved inner peripheral surface. While the dimension is made larger than the minimum inner diameter of the outer claw portion, the outer peripheral surface at the tip portion of the inner claw portion fitted and locked in the inner locking groove is axially larger than the inner peripheral surface. It is characterized by a steep inclination angle close to.

  According to the medical valve having the structure according to the present aspect, the elastic valve body is deformed along the inner peripheral surface of the curved inner claw portion, so that stress concentration of the elastic valve body at the time of inserting the male connector is concentrated. And damage can be avoided. Further, the support force for the elastic valve body is improved by the outer peripheral surface of the inner claw portion having a steep inclination angle, so that the elastic valve body is effectively prevented from falling off due to the insertion of the male connector.

  A ninth aspect of the present invention is to provide a port for connecting a male connector to which a disc-shaped elastic valve body is mounted, and to provide an inner locking groove and an outer engagement groove formed in an outer peripheral portion of the elastic valve body. In a medical valve in which an inner claw portion and an outer claw portion formed in a housing are engaged with and supported by a stop groove, in the outer claw portion of the elastic valve body, the outer claw portion being overlapped with the outer claw portion. The inner diameter of the axially outer end portion on the inner peripheral surface is set within the range of 3.9 to 4.5 mm, and the elastic valve element is radially compressed by the outer claw portion. It is a feature.

  In the medical valve having the structure according to the present aspect, the elastic valve body is radially compressed by the outer claw portion set to a specific inner diameter dimension, so that the elastic valve due to excessive inclination when the male connector is inserted. Avoidance of body damage and realization of proper holding force for the inserted male connector can be achieved.

  A tenth aspect of the present invention is the medical valve according to the ninth aspect, wherein an outer diameter dimension of a central portion of the elastic valve body located on an inner peripheral side of the outer locking groove is the outer locking dimension. The outer claw is larger than the inner diameter of the outer claw to be locked in the groove, and the depth of the outer claw is smaller than the axial protrusion of the outer claw. The elastic valve body is compressed in the radial direction and the axial direction by the portion.

  According to the medical valve having the structure according to the present aspect, by appropriately setting the shapes of the outer claw portion and the outer locking groove, the elastic valve body is efficiently compressed in the radial direction, and It is possible to reduce the risk of squeezing a thin portion sandwiched by the inner and outer claw portions by the tip of the connector.

  An eleventh aspect of the present invention is the medical valve according to the ninth or tenth aspect, wherein the outer peripheral surface of the central portion of the elastic valve body located on the inner peripheral side of the outer locking groove is the outer side. The entire length of the locking groove in the axial direction from the bottom side end to the opening side end and over the entire circumferential direction is radially compressed by the inner peripheral surface of the outer claw portion.

  According to the medical valve having the structure according to the present aspect, it is possible to reduce the risk of squeezing the thin-walled portion sandwiched between the inner and outer claw portions by the tip of the male connector.

  A twelfth aspect of the present invention is directed to the medical valve according to any one of the ninth to eleventh aspects, wherein a radial compression force of the outer claw portion of the elastic valve element is an axis of the elastic valve element. In the direction, the outer portion is made larger than the inner portion.

  According to the medical valve having the structure according to this aspect, the insertability of the male connector and the resilience of the elastic valve body can be improved.

  A thirteenth aspect of the present invention is to provide a port for connecting a male connector to which a disk-shaped elastic valve body is mounted, and to provide an inner locking groove and an outer engagement groove formed on an outer peripheral portion of the elastic valve body. In a medical valve in which an inner claw part and an outer claw part formed in a housing are engaged with and supported by a stop groove, an inner peripheral surface of the outer claw part has an axially inner end side. Is provided with an enlarged diameter inner peripheral surface, and the axial length of the enlarged diameter inner peripheral surface is an axially opposed surface of the most distal surfaces of the inner claw portion and the outer claw portion. It is characterized in that the distance is equal to or greater than the distance.

  In the medical valve having the structure according to this aspect, it is possible to more effectively achieve both the securing of the supporting force of the elastic valve body by the inner and outer claw portions and the reduction of the stress at the time of inserting the male connector by the radially expanded inner peripheral surface. It will be possible.

  According to the medical valve having the structure according to the present invention, it is possible to reduce the stress generated in the elastic valve body and improve the durability when the male connector is inserted.

1 is a vertical cross-sectional view showing a medical valve according to an embodiment of the present invention. It is a figure which expands and shows the principal part of the medical valve shown by FIG. 1, Comprising: It is explanatory drawing for demonstrating the shape of an inside and outside nail | claw part. It is a figure which expands and shows the principal part of the medical valve shown by FIG. 1, Comprising: It is explanatory drawing for demonstrating the shape of an elastic valve body. FIG. 2 is a perspective view showing the elastic valve body constituting the medical valve shown in FIG. 1 in a single item state before being attached to a housing. FIG. 5 is a vertical sectional view of the elastic valve body shown in FIG. 4. FIG. 2 is a vertical cross-sectional view showing a state where a male connector is straightly inserted into the medical valve shown in FIG. 1 and an elastic valve body is pushed open. FIG. 2 is a vertical cross-sectional view showing a state where a male connector is obliquely inserted into the medical valve shown in FIG. 1.

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

  First, FIGS. 1 to 3 show a medical valve 10 as one embodiment of the present invention. This medical valve 10 is provided with a substantially cylindrical housing 12 extending in the axial direction, and one opening 14 in the axial direction of the housing 12 (upper side in FIG. 1) serves as a port for connecting a male connector. In addition, the elastic valve body 16 is attached to the port (opening 14). In addition, in the following description, the axial direction and the vertical direction refer to the vertical direction in FIG.

  More specifically, the elastic valve body 16 is formed of an elastic body such as rubber or elastomer, and as shown in FIGS. It has a surface shape that is rotationally symmetrical.

  Further, the central portion 18 of the elastic valve body 16 is formed into a substantially circular disc shape, and the slit 20 is formed in the central portion 18 so as to vertically penetrate therethrough. The shape of the slit 20 is not limited in any way, but a linear shape (single-letter shape), a cross shape, a shape extending radially from the center, or the like can be preferably adopted.

  Further, on the outer peripheral side of the elastic valve body 16, there is provided a cylindrical support portion 22 which projects inward and outward in the axial direction. The central portion 18 and the tubular support portion 22 are connected by the annular connecting portion 24 in the radial direction. The annular connecting portion 24 integrally connects the central portion 18 and the tubular support portion 22 over the entire circumference in the circumferential direction. In the present embodiment, the elastic valve body 16 is formed as an integrally molded product. ..

  The thickness of the annular connecting portion 24 is smaller than that of the central portion 18 of the elastic valve body 16. As a result, substantially annular inner locking grooves 26 and outer locking grooves 28, which extend over the entire circumference in the circumferential direction, are formed on the outer peripheral portions of the elastic valve body 16 on the inner and outer surfaces in the axial direction. The annular connecting portion 24 is constituted by the axial portions of the bottoms of the two locking grooves 26, 28. That is, the central portion 18 of the elastic valve body 16 projects inward in the axial direction from the groove bottom surface 26a of the inner locking groove 26 and the axial direction from the groove bottom surface 28a of the outer locking groove 28. It is configured to include an outward protruding portion 18b that protrudes outward. In this embodiment, the projecting dimension of the inner projecting portion 18a is smaller than the projecting dimension of the outer projecting portion 18b, and the annular connecting portion 24 formed between the groove bottom surfaces 26a and 28a has the central portion 18. Is provided so as to be offset downward from the center in the axial direction.

  Further, on the inner peripheral side of the inner locking groove 26, a concave groove portion 30 is formed as a peripheral groove that continuously extends over the entire circumference in the circumferential direction. The concave groove portion 30 has a groove depth shallower than the inner locking groove 26 and continuously extends to the inner peripheral side of the inner locking groove 26. The outer peripheral end of the concave groove portion 30 on the groove upper bottom surface 30a is the inner locking groove. It is an open end on the inner peripheral side of the groove 26.

  Further, in the present embodiment, in the single state of the elastic valve body 16 shown in FIGS. 4 and 5, the inner locking groove 26 and the outer locking groove 28 are substantially at the same position in the radial direction of the elastic valve body 16. And are provided so as to overlap in the axial direction. The inner bottom surface 26a of the inner locking groove 26 has a flat shape that expands in an annular shape with a small width in the radial direction. The inner bottom surface 26a and the outer peripheral surface 26b are inclined as wall surfaces on both sides of the groove that expand toward the groove opening side. It has a peripheral surface 26c. Similarly, the groove bottom surface 28a of the outer locking groove 28 also has a flat shape that expands annularly with a small width in the radial direction, and the outer peripheral surface 28b and the inner peripheral surface serve as both groove wall surfaces that expand toward the groove opening side. 28c.

  In addition, the tubular support portion 22 provided on the outer peripheral side of the annular coupling portion 24 includes an upper support portion 32 that projects axially outward from the annular coupling portion 24 and a lower support portion 34 that projects axially inward. Have In the present embodiment, the upper support portion 32 projects upward with a size that does not reach the upper end surface of the elastic valve body 16. On the other hand, the lower support portion 34 projects downward to a greater extent than the lower end surface of the elastic valve body 16. Further, a flange-shaped portion 36 that spreads to the outer peripheral side is integrally formed at the protruding tip portion (lower end portion) of the lower support portion 34.

  On the other hand, the housing 12 of the present embodiment includes a base member 38, an inner housing 40, and an outer housing 42, each of which has a substantially tubular shape. It is preferable that each of the base member 38, the inner housing 40, and the outer housing 42 is made of a hard synthetic resin.

  The base member 38 is provided with a peripheral wall portion 46 on the outer peripheral side of a vertically extending central cylindrical portion 44, and the respective upper wall portions 48 are connected by an annular upper bottom portion 48 near the upper ends thereof. The axial dimension of the central tubular portion 44 is larger than the axial dimension of the peripheral wall portion 46, and the central tubular portion 44 projects downward from the peripheral wall portion 46. A female screw portion 50 is formed on the inner peripheral surface of the peripheral wall portion 46 so that a luer lock type connector or the like can be connected to the central tubular portion 44. In addition, a tapered surface 52 whose diameter increases upward is provided on the inner peripheral surface of the upper opening portion of the central tubular portion 44. The shape of the base member 38 can be changed depending on the portion where the medical valve 10 is provided, and for example, the base member may be a three-way stopcock.

  Further, above the upper bottom portion 48, a ring-shaped fixing groove 54 extending over the entire circumference in the circumferential direction between the radially facing surfaces of the upper ends of the central cylindrical portion 44 and the peripheral wall portion 46 is formed. ing. The wall portion on the outer peripheral side of the fixing groove 54 is an annular support wall 56 protruding upward from the upper bottom portion 48.

  The inner housing 40 is formed in a rotationally symmetric shape having a substantially tapered tubular shape whose diameter decreases upward. An annular seat portion 60, which has a gooseneck-shaped bent cross section and narrows toward the inner peripheral side, is formed in the upper portion of the inner housing 40. An annular inner claw portion 62 that projects upward in the axial direction is formed on the inner peripheral edge of the seat portion 60. Further, the tip portion of the inner claw portion 62 is a locking portion 64 that is locked in the inner locking groove 26 of the elastic valve body 16. The locking portion 64 refers only to a portion that protrudes upward from the bottom surface of the recessed groove portion 30 and is fitted into the inner locking groove 26.

  In the vertical cross-sectional views shown in FIGS. 1 to 3, the locking portion 64 has a flat top end surface 64a located at the upper end and spreading over the entire circumference with a predetermined radial width. The locking portion 64 has an outer peripheral surface 64b extending downward from the outer peripheral end of the most distal end surface 64a and an inner peripheral surface 64c extending downward from the inner peripheral end of the most distal end surface 64a.

  The outer peripheral surface 64b is an inclined surface that gradually expands in diameter downward. The outer peripheral surface of the inner claw portion 62 has a substantially protruding portion that extends downward from the tip portion (locking portion 64) locked to the inner locking groove 26 and reaches the axial position that is the opening position of the recessed groove portion 30. The inclined surface extends downward with a constant inclination angle α.

  The inner peripheral surface 64c is an inwardly convex inclined curved surface that is curved so that the downward inclination in the axial direction gradually increases. The outer peripheral surface 64b and the inner peripheral surface 64c of the locking portion 64 are adapted to be overlapped with the outer peripheral surface 26b and the inner peripheral surface 26c of the inner locking groove 26, as described later. Therefore, the inner peripheral surface 64c of the locking portion 64 reaches the opening end of the inner locking groove 26. The locking portion 64 having such an outer peripheral surface 64b and an inner peripheral surface 64c has a tapered shape in which the thickness gradually decreases toward the protruding tip.

  In the present embodiment, the inclination angle α from the axial direction of the outer peripheral surface 64b (see FIG. 2) is smaller than the inclination angle β from the axial direction of the tip of the inner peripheral surface 64c (see FIG. 2). That is, at the tip portion of the inner claw portion 62, the outer peripheral surface 64b has a steeper inclination angle (α> β) closer to the axial direction than the inner peripheral surface 64c.

  Further, the most distal end surface 64a of the locking portion 64 is biased to the outer peripheral side with respect to the radial center of the tip portion of the inner claw portion 62 (see the alternate long and short dash line L in FIG. 2). That is, the radial center of the most distal surface 64a is located on the outer peripheral side with respect to the central line L in FIG. 2, and in the present embodiment, substantially the entire most distal surface 64a is more than the central line L in FIG. It is located on the outer peripheral side.

  Further, in the present embodiment, the inner peripheral surface of the inner claw portion 62 including the lower part of the locking portion 64 is a curved inner peripheral surface 66 having a curved cross-sectional shape that is convex toward the inner peripheral side as a whole. ing. The curved inner peripheral surface 66 need only have a curved cross-sectional shape as a whole, and need not be formed with a constant radius of curvature over the entire surface. For example, the curved inner peripheral surface 66 may have a linear portion in the cross-sectional views shown in FIGS. 1 to 3 and may have different radii of curvature in the vertical direction of the cross section.

  In the present embodiment, in the curved inner peripheral surface 66 of the inner claw portion 62, the portion from the tip end portion (locking portion 64) locked to the inner locking groove 26 to the portion located in the recessed groove portion 30 is The curved surface 66a has a center of curvature on the outer peripheral side of the curved inner peripheral surface 66 and does not have a straight line portion. The curved surface 66a referred to here includes the inner peripheral surface 64c of the locking portion 64 at the upper end portion. Further, in the present embodiment, the curved inner peripheral surface 66 of the inner claw portion 62 extends to the outside of the inner locking groove 26 and the concave groove portion 30 and spreads downward.

  On the other hand, the lower end portion of the inner housing 40 is provided with an annular base end portion 68 having a substantially constant thickness dimension (vertical direction) and protruding to the outer peripheral side. The annular base end portion 68 has a size and shape that fits into the fixing groove 54 in the base member 38.

  Further, the outer housing 42 has a structure in which a lower large-diameter tubular portion 70 and an upper small-diameter tubular portion 72 are integrally connected by a stepped annular shoulder portion 74 that expands in the radial direction. That is, an annular shoulder portion 74 is provided at an axially intermediate portion, a small-diameter tubular portion 72 is provided above the annular shoulder portion 74, and a large-diameter tubular portion 70 is provided below.

  The small-diameter cylindrical portion 72 has a tapered shape in which the diameter gradually becomes smaller as it goes outward in the axial direction. Further, an annular front end wall portion 76 that expands toward the inner peripheral side is formed at the front end portion of the small diameter cylindrical portion 72, and the inner peripheral edge portion of the front end wall portion 76 is designed to be folded back inward in the axial direction. And an outer claw portion 78 that protrudes downward is formed. An outer holding groove 80 extending in the circumferential direction with a predetermined width in the radial direction is formed in the upper end portion of the outer housing 42 as an annular groove that opens downward in the axial direction.

  In addition, the inner peripheral surface 78a of the outer claw portion 78 has a cylindrical inner peripheral surface 81 that extends in the axial direction with the inner diameter dimension within a predetermined size range described later, and the outer claw portion 78 has an axial outer end portion. (Protruding base end portion). Further, a radially enlarged inner peripheral surface 82 is formed at the protruding tip portion of the inner peripheral surface 78a so as to gradually expand inward in the axial direction. In addition, in the present embodiment, the distal end portion on the lower side in FIG. 2 in the cylindrical inner peripheral surface 81 is tapered so that the diameter is expanded downward, and the expanded inner peripheral surface 82 is formed in the cylindrical inner peripheral surface 81. It is configured to include the tip portion of the peripheral surface 81.

  The expanded diameter inner peripheral surface 82 of the present embodiment includes an inclined surface 82a which is inclined at a substantially constant inclination angle θ (see FIG. 2) with respect to the axial direction and extends in the axial direction. It is desirable that the inclination angle θ of the inclined surface 82a be larger than 45 degrees. By adopting the inclination angle θ larger than 45 degrees, it is possible to secure the length of the cylindrical inner peripheral surface 81 and to increase the axial facing area with the recessed groove portion 30 and thus the elastic valve body between the facing surfaces. The thickness or volume of 16 can be increased. Further, by making the inclination angle θ larger than 45 degrees, the compression force exerted on the elastic valve body 16 when the male connector is inserted is more efficiently diffused in the direction along the inclined surface 82a of the outer pawl portion 78. It can be released and the generated stress can be reduced.

  By setting the inclination angle θ of the inclined surface 82a to 90 degrees or an angle close thereto, a step surface is formed in the axially intermediate portion of the inner peripheral surface 78a, and the inner peripheral surface 78a has a large diameter inward in the axial direction. It is also possible to form the portion and the small-diameter portion outward in the axial direction with stepped cylindrical surfaces formed on both axial sides of the stepped surface.

  Further, the upper end of the inclined surface 82a is connected to the portion 81a of the cylindrical inner peripheral surface 81 having a constant inner diameter by a smooth curved surface. As a result, the inner peripheral surface 78a of the outer claw portion 78 smoothly extends in the axial direction without any breaking points or steps over the entire axial direction. Although it is not essential to smoothly connect the inclined surface 82a and the portion 81a of the cylindrical inner peripheral surface 81 having a constant inner diameter dimension with a curved surface, by smoothly connecting the both, when inserting the male connector, The tip of the male connector or the deformable elastic valve body 16 can be guided more smoothly by the inner peripheral surface 78a.

  The lower end of the inclined surface 82a can also be smoothly connected to the most distal end surface 83 of the lower end of the outer claw 78 by a curved surface, but in the present embodiment, it is connected with a corner. As a result, the inner peripheral edge of the most distal surface 83 of the outer claw 78 is formed into an edge shape, but the elastic valve element 16 at the time of inserting the male connector is located at the inner peripheral edge of the most distal surface 83 of the outer claw 78. There is no big problem because it deforms in the away direction, and the accuracy of positioning and holding the elastic valve body 16 can be improved.

  In particular, in the present embodiment, the most distal end surface 83 of the outer claw portion 78 is an annular flat surface having a certain radial width dimension and extending in the axis-perpendicular direction. Further, the radial width of the most distal surface 83 is made larger than the radial width of the most distal surface 64a of the inner claw portion 62, and as will be described later, the most distal surface 83 of the outer claw portion 78 and the inner claw portion are formed. The most distal surface 64a of 62 is directly opposed to the axial direction with a predetermined distance.

  Furthermore, on the outer peripheral surface of the small-diameter cylindrical portion 72, a male screw portion 84 with which a female screw portion of a luer lock connector is screwed is formed. The male screw portion 84 is, for example, a double thread screw that can be connected to the female screw portion of the luer lock connector defined by ISO594.

  Note that the outer diameter of the outer housing 42 is set within the range of 6.0 to 7.0 mm for the outer diameter of the small-diameter cylindrical portion 72 when the male screw portion 84 is not formed as in the present embodiment. Is preferable, and when the male screw portion 84 is formed as in the present embodiment, it is preferable that the outer diameter of the small diameter cylindrical portion 72 including the screw thread is set within the range of 7.2 to 8.0 mm.

  Further, the annular shoulder portion 74 of the outer housing 42 is formed with a fitting groove 86 that opens downward. In this embodiment, the fitting groove 86 is an annular groove that extends over the entire circumference in the circumferential direction.

  Then, the housing 12 is constituted by the base member 38, the inner housing 40, and the outer housing 42 as described above, and the elastic valve body 16 is provided in the opening 14 above the housing 12, and the inner housing 40 and the outer housing 42 are provided. The medical valve 10 of the present embodiment is configured by being sandwiched and supported by.

  That is, the annular base end portion 68 of the inner housing 40 is fitted into the fixing groove 54 that opens upward in the base member 38, and is positioned in the radial direction. Then, the flange-shaped portion 36 of the elastic valve body 16 is superposed on the upper surface of the annular base end portion 68, and the locking portion 64 of the inner claw portion 62 of the inner housing 40 is engaged with the inner engagement portion of the elastic valve body 16. It is pushed and locked so as to bite into the stop groove 26. As a result, the outer surface of the locking portion 64 of the inner claw portion 62 is superposed on the inner surface of the inner locking groove 26, and the portion of the inner claw portion 62 below the locking portion 64 is separated from the inner locking groove 26. It is protruding.

  If necessary, the base member 38 and the inner housing 40 may be fixed to each other by means such as adhesion or welding. Further, in the present embodiment, since the concave groove portion 30 is provided on the inner peripheral side of the inner locking groove 26, the inner peripheral surface (the curved inner peripheral surface 66) of the inner claw portion 62 and the inner peripheral surface of the concave groove portion 30. The inner surface (curved inner peripheral surface 66) of the inner claw portion 62 is separated from the surface in the radial direction, and in the state before insertion of the syringe 88 (described later) (the state shown in FIG. 1). Except for the portion inserted into the stop groove 26 (the inner peripheral surface 64c of the locking portion 64), it is exposed to the internal space of the housing 12 without being covered by the elastic valve body 16. As a result, when the syringe 88 is inserted, elastic deformation of the elastic valve body 16 easily occurs, and the insertion resistance can be reduced.

  Further, the outer housing 42 is overlapped and fixed to the base member 38 from the outside in the axial direction. The outer housing 42 is assembled to the base member 38 with a pressing force in the axial direction. As a result, the flange-shaped portion 36 of the elastic valve body 16 is overlapped with the annular base end portion 68 of the inner housing 40 inside the fixing groove 54 of the outer housing 42 to form the annular shoulder portion 74 of the outer housing 42. It is supported by being sandwiched between them in the axial direction. The lower support portion 34 of the elastic valve body 16 is sandwiched and supported between the inner housing 40 and the outer housing 42 in the radial direction. In the present embodiment, in the inner housing 40 and the outer housing 42, the convex portions to be pressed against the upper and lower surfaces of the flange-shaped portion 36 of the elastic valve body 16 having a substantially rectangular cross section are provided at substantially opposite positions, and the flanges are provided. The shape portion 36 is compressed between the inner housing 40 and the outer housing 42 in the axial direction, and the support strength to the elastic valve body 16 is improved. However, the constricted portion is formed in the flange-shaped portion 36, and the constricted portion is sandwiched by the convex portions provided in the inner housing 40 and the outer housing 42, whereby the support strength to the elastic valve body 16 is improved. It can also be planned.

  Further, the upper support portion 32 of the tubular support portion 22 of the elastic valve body 16 is pressed into the outer holding groove 80 of the outer housing 42 and supported in a fitted state. Further, the outer claw portion 78 of the outer housing 42 is pushed into and locked in the outer locking groove 28 of the elastic valve body 16 so as to bite into the outer locking groove 28. In addition, in FIGS. 1 to 3, in order to explain the biting of the outer claw portion 78, a shape line corresponding to the elastic valve body 16 in a single item state is shown by a two-dot chain line.

  As a result, the inner peripheral surface 78a of the outer claw portion 78 is superposed in close contact with the substantially entire inner peripheral surface 28c of the outer locking groove 28 (the outer peripheral surface of the outer protruding portion 18b). In the present embodiment, as will be described later, the outer protruding portion 18b is radially compressed by the outer claw portion 78. Whether the upper end surface of the central portion 18 of the elastic valve body 16 is located substantially flush with the upper end surface of the distal end wall portion 76 of the outer housing 42 or slightly inward in the axial direction, It is located slightly outward in the axial direction. By doing so, it is possible to easily disinfect the entire top surface (upper end surface) of the elastic valve body 16 using a disinfecting cloth or the like. However, the upper end surface of the central portion 18 may be apart from the upper end surface of the distal end wall portion 76 of the outer housing 42 to some extent in the axial direction upward or downward.

  Further, the inner claw portion 62 of the inner housing 40 is axially opposed to the outer claw portion 78 of the outer housing 42 with the annular coupling portion 24 of the elastic valve body 16 interposed therebetween.

Here, the minimum inner diameter dimension of the protruding tip portion (locking portion 64) of the inner claw portion 62, that is, the inner diameter dimension φ _i (see FIG. 1) at the most distal end surface 64 a of the inner claw portion 62 is the maximum of the outer claw portion 78. It is made larger than the inner diameter dimension φ _o at the tip surface 83, and the inner peripheral edge of the most distal surface 64a of the inner claw portion 62 is located on the outer peripheral side of the inner peripheral edge of the most distal surface 83 of the outer pawl portion 78. There is. In particular, in the present embodiment, the radial distance A (see FIG. 2) between the inner peripheral edge of the most distal surface 64a of the inner pawl 62 and the inner peripheral edge of the most distal surface 83 of the outer pawl 78, that is, the inner pawl portion The dimensional difference (φ _i / 2-φ _o / 2) between the inner radius of the most distal surface 64a of 62 and the inner radius of the most distal surface 83 of the outer claw 78 is equal to the outermost surface 64a of the inner claw 62 and the outer side. The distance is smaller than the axially facing distance (the thickness dimension T ₁ of the first thin portion, which will be described later) of the claw portion 78 from the most distal surface 83. Further, the outer peripheral end of the innermost claw portion 62 at the most distal end surface 64a is located on the inner peripheral side of the outermost end of the outermost claw portion 78 at the most distal end surface 83. As a result, the tip end surface 64a of the inner claw portion 62 is axially opposed to the tip end surface 83 of the outer claw portion 78 over the entire surface.

  Further, in the present embodiment, an inclined surface 82a having a substantially constant inclination angle θ is provided at the protruding tip portion of the inner peripheral surface 78a of the outer claw portion 78. The curved inner peripheral surface 66, which is the inner peripheral surface of the inner claw portion 62, is located on the extension line of the inclined surface 82a inward (downward) in the axial direction. Further, the inclined surface 82a of the outer claw portion 78 and the recessed groove portion 30 overlap each other in at least a part in the radial direction as projected in the axial direction.

  The outer peripheral end of the inclined surface 82a is located on the inner peripheral side of the outer peripheral end of the concave groove portion 30 (the opening end of the inner locking groove 26), and the inner peripheral end of the inclined surface 82a is formed in the concave groove portion. It is located on the outer peripheral side of the inner peripheral end of 30. That is, the recessed groove portion 30 extends to both sides of the inner and outer peripheries of the inner peripheral surface 78 a of the outer claw portion 78 and extends. As a result, the entire inclined surface 82a faces the concave groove portion 30 in the axial direction.

Furthermore, when the elastic valve body 16 is mounted on the housing 12, the thickness gradually increases from the annular connecting portion 24 toward the central portion 18 toward the inner peripheral side. That is, in the elastic valve body 16, the first thin-walled portion having the smallest thickness dimension is formed in the portion between the facing surfaces sandwiched by the respective most distal surfaces 64a and 83 of the inner claw portion 62 and the outer claw portion 78. .. The first thin portion is constituted by the annular connecting portion 24 of the elastic valve body 16, and the first thin portion has a thickness dimension T ₁ (see FIG. 3) on the distal end surface 64a of the inner claw portion 62. ) Is formed.

  Further, on the inner peripheral side of the first thin portion (annular coupling portion 24), a second thin portion 89a is formed which gradually becomes thicker toward the center (inner peripheral side). The second thin portion 89a is a portion sandwiched in the axial direction by the inner peripheral surface 64c of the locking portion 64 of the inner claw portion 62 and the most distal surface 83 of the outer claw portion 78.

In the present embodiment, the inner peripheral edge of the inner peripheral surface 64c of the locking portion 64 is located on the outer peripheral side of the inner peripheral edge of the most distal end surface 83 of the outer claw portion 78. That is, the minimum inner diameter dimension (φ _d described later) of the inner peripheral surface 64 c of the locking portion 64 is made larger than the inner diameter dimension (φ _o ) of the most distal end surface 83 of the outer claw portion 78 (φ _d > φ). _o ). As a result, the maximum thickness dimension of the second thin wall portion 89a is T ₂ (see FIG. 3), and the second thin wall portion 89a has a thickness dimension from T ₁ to T ₂ toward the inner peripheral side. It is getting bigger and bigger.

Furthermore, on the inner peripheral side of the second thin portion 89a, the second thin portion 89a is located between the groove upper bottom surface 30a of the concave groove portion 30 and the inclined surface 82a (diameter expansion inner peripheral surface 82) of the outer claw portion 78 in the axial direction. A third thin portion 89b having a larger thickness than that is formed. Third thin portion 89b is progressively thicker toward the center (inner peripheral side), and is gradually increased thickness dimension up to T ₃ of the inner peripheral edge from T ₂ of the outer peripheral edge.

In addition, in this embodiment, a transition region 89c is provided between the second thin portion 89a and the third thin portion 89b in the radial direction. The transition region 89c extends with a substantially constant thickness dimension (T ₂ ) between the groove bottom surface 30a of the concave groove portion 30 and the tip end surface 83 of the outer claw portion 78 in the axial direction. However, the transition region 89c is not essential, and the second thin portion and the third thin portion may be directly continuous in the radial direction.

  The central portion 18 of the elastic valve body 16 having a larger thickness than the third thin portion 89b is continuously provided on the inner peripheral side of the third thin portion 89b. The central portion 18 has an outer peripheral surface that overlaps the cylindrical inner peripheral surface 81 of the outer pawl portion 78 in a close contact state.

Here, in the medical valve 10 according to the present embodiment, a portion (cylindrical inner peripheral surface) having an inner diameter dimension within a predetermined dimension range described later at an axially outer end portion of the inner peripheral surface 78a of the outer claw portion 78. The axial length B ₁ (see FIG. 2) of 81) is preferably set to 1/3 or more of the entire length B (see FIG. 1 etc.) of the outer claw portion 78, and more preferably 1 / 2 or more, more preferably 2/3 or more.

Since the axial length B _{1 of the} cylindrical inner peripheral surface 81 is set to 1/3 or more of the axial length B of the outer claw portion 78, it is difficult for the syringe 88 to hit the annular connecting portion 24 in an oblique state, and the syringe 88 It is possible to reduce the risk and strength of the annular connecting portion 24 and the like being squeezed by the tip of the. In the present embodiment, the cylindrical inner peripheral surface 81 is about ⅔ of the axial length from the upper surface (the upper end surface of the outer housing 42) to the lower surface (the most distal surface 83) of the outer claw portion 78. It is configured to include a portion 81a having a constant inner diameter dimension and a part of chamfered curved surfaces located above and below the portion 81a.

Incidentally, with respect to the axial length B of the outer claw portion 78, and the axial length B ₁ of the cylindrical inner peripheral surface 81, the axial length B ₂ of the upset inner peripheral surface 82 includes an inclined surface 82a The length is not limited. In the present embodiment, the axial length B _{2 of} the expanded diameter inner peripheral surface 82 is set to be the most distal end surface 64 a of the inner and outer claw portions 62, 78 in order to improve durability when the tip of the syringe 88 is squeezed. The distance between opposing surfaces 83 is T ₁ or more.

Further, in the present embodiment, as shown in FIG. 1, the minimum inner diameter dimension φ _c of the outer claw portion 78 is smaller than the minimum inner diameter dimension φ _d of the locking portion 64 of the inner claw portion 62 (φ _c <φ _d ). In particular, in this embodiment, the minimum inner diameter dimension φ _c of the outer claw portion 78 is smaller than the minimum inner diameter dimension φ _m of the entire inner claw portion 62 (φ _c <φ _m ). The minimum inner diameter dimension φ _c of the inner peripheral surface 78 a of the outer claw portion 78 is set to a portion 81 a of the cylindrical inner peripheral surface 81 where the inner diameter dimension is constant, and the minimum inner diameter dimension φ of the inner claw portion 62 is set. _m is set in a portion located in the vicinity of the opening of the concave groove portion 30 on the curved inner peripheral surface 66.

  Here, the inner diameter dimension of the cylindrical inner peripheral surface 81 of the outer claw portion 78 is preferably set within the range of 3.9 mm to 4.5 mm, and more preferably 4.0 mm to 4.4 mm. It is set within the range. If the inner diameter of the cylindrical inner peripheral surface 81 is smaller than 3.9 mm, it may be difficult to obtain a sufficient male connector insertion length and the connection may become unstable. On the other hand, if the inner diameter of the cylindrical inner peripheral surface 81 is larger than 4.5 mm, the insertion direction of the male connector may be greatly inclined with respect to the central axis of the housing 12, and the tip of the syringe 88 may move the annular connecting portion 24. It is not preferable because the distance becomes very large.

It should be noted that, in the elastic valve body 16 in a single product state before being assembled to the housing 12, as shown in FIGS. The diameter dimension φ _e is larger than the minimum inner diameter dimension φ _{c of the} inner peripheral surface 78a of the outer pawl portion 78 fitted therein (φ _e > φ _c ). Moreover, the depth dimension F ₁ of the outer locking groove 28 is made smaller than the protrusion dimension B ₃ (see FIG. 2) of the outer claw portion 78 (F ₁ <B ₃ ). As a result, the elastic valve body 16 is compressed by the outer claw portion 78 in the radial direction and the axial direction.

Further, the protruding dimension F ₂ (see FIG. 5) of the outward protruding portion 18b of the elastic valve body 16 in the single item state is smaller than the axial length B of the outer claw portion 78. As a result, the outer peripheral surface of the outward protruding portion 18b is the entire axial length from the bottom end (lower end) to the opening side end (upper end) of the outer locking groove 28 and the entire outer surface in the circumferential direction. The claw portion 78 is radially compressed by the inner peripheral surface 78a. Furthermore, in the outer locking groove 28 of the elastic valve body 16 in the single item state, the width dimension of the groove bottom surface 28a is smaller than that of the most distal end surface 83 of the outer claw portion 78, and the center of the groove bottom surface 28a in the width direction. Is offset radially outward from the widthwise center of the most distal surface 83 of the outer claw 78. As a result, it is possible to more effectively apply the radial compressive force to the outward protruding portion 18b while appropriately adjusting the axial clamping force of the elastic valve body 16 with respect to the annular connecting portion 24. ..

  The radial compressive force exerted on the outer protruding portion 18b by the outer claw portion 78 is larger on the upper end portion side (outer portion) than on the lower end portion (inner portion) of the outer protruding portion 18b. This is because the lower side of the inner peripheral surface 78a of the outer claw portion 78 is an inclined surface 82a having an enlarged diameter.

  Incidentally, FIG. 6 shows a state in which the distal end portion of the syringe 88 as a male connector is inserted into the medical valve 10 having the above structure. That is, by inserting the distal end portion of the syringe 88 into the elastic valve body 16 from the upper opening 14 which is a port for male connector connection in the medical valve 10, the central portion 18 of the elastic valve body 16 is axially moved. The slit 20 is opened by being pushed inward in the direction. As a result, the fluid flow path 90 from the inside of the syringe 88 to the inside of the human body through the inside of the medical valve 10 is brought into communication.

The tip portion of the syringe 88 is a tapered surface whose outer diameter size gradually decreases toward the tip, and the minimum outer diameter dimension φ _g (see FIG. 6) at the tip portion of the syringe 88 is the cylinder of the outer claw portion 78. Smaller than the minimum inner diameter dimension φ _c of the inner peripheral surface 81 and the minimum inner diameter dimension φ _m of the inner claw portion 62. On the other hand, the maximum outer diameter dimension φ _h (see FIG. 6) at the tip portion of the syringe 88 is larger than the inner diameter dimension at the upper end of the cylindrical inner peripheral surface 81 of the outer claw portion 78. Accordingly, when the syringe 88 is inserted into the medical valve 10, the upper end of the cylindrical inner peripheral surface 81 of the outer claw portion 78 and the outer peripheral surface of the syringe 88 are brought into contact with each other, and the syringe 88 is The insertion end of is defined. When the syringe 88 is a slip syringe, the syringe 88 and the housing 12 (external housing 42) are fitted to each other when the syringe 88 is inserted, so that the elastic valve body 16 elastically deforms to restore the syringe 88. Is suppressed or prevented from being pushed back in the direction opposite to the insertion direction (kickback).

  Further, in the present embodiment, when the syringe 88 is inserted and the central portion 18 of the elastic valve body 16 is deformed so as to be spread downward, the lower end surface of the central portion 18 is the inner peripheral surface of the inner claw portion 62. It is adapted to be superposed on the inner peripheral surface of the inner housing 40 including the (curved inner peripheral surface 66).

Here, in the medical valve 10 according to the present embodiment, as shown in FIG. 7, even when the syringe 88 is obliquely inserted into the opening 14 of the housing 12, the inner claw portion 62 is locked. Since the minimum inner diameter dimension φ _d of the portion 64 is made larger than the minimum inner diameter dimension φ _c of the outer claw portion 78, the wall thickness of the elastic valve body 16 at the portion sandwiched between the syringe 88 and the inner claw portion 62 is advantageous. Can be secured. Further, in addition to the inner diameter dimension of the cylindrical inner peripheral surface 81 of the outer claw portion 78 being set within the range of 3.9 mm to 4.5 mm, which is smaller than that of the conventional one, the axis of the cylindrical inner peripheral surface 81 is reduced. Since the directional length B ₁ is set to be ⅓ or more of the axial length B of the outer claw portion 78, the inclination angle with respect to the central axis of the syringe 88 when obliquely inserted can be suppressed to be small. .. As a result, the syringe 88 can be inserted more straightly into the elastic valve body 16, the elastic valve body 16 is less likely to be sandwiched between the tip of the syringe 88 and the inner claw portion 62, and the sandwiched portion is Can be squeezed by the tip of the syringe 88, and damage such as tearing of the elastic valve body 16 due to stress concentration or strong rubbing on the sandwiched portion can be prevented.

  Further, since the concave groove portion 30 axially faces the expanded diameter inner peripheral surface 82 (the inclined surface 82a), the concave groove portion 30 may be provided on the inner surface of the elastic valve body 16 as in the present embodiment. Also, it is possible to prevent the damage by securing a large thickness dimension of the elastic valve body 16 in the portion squeezed by the tip of the syringe 88. In particular, since the concave groove portion 30 extends to the inner peripheral side of the outer claw portion 78, the deformation of the elastic valve body 16 when the syringe 88 is inserted is more easily permitted, and the durability of the elastic valve body 16 is improved. And the syringe insertion operability can be improved.

  Further, the elastic valve body 16 is provided with the first thin portion 24, the second thin portion 89a, and the third thin portion 89b from the outer peripheral side toward the inner peripheral side, and the wall thickness is gradually increased. As a result, the supporting force of the outer and inner claws 78 and 62 is effectively exerted on the first thin portion 24, while the elastic deformation at the time of inserting the syringe is appropriately allowed to occur in the second and third thin portions. It becomes possible to secure the elastic volume while improving the durability and preventing damage while reducing stress and improving operability.

In particular, the radial distance A between the inner peripheral edge of the innermost claw portion 62 at the most distal end surface 64a and the inner peripheral edge of the outermost claw portion 78 at the most distal end surface 83 is the thickness of the first thin portion (annular coupling portion 24). It is smaller than the dimension T ₁ . This prevents the elastic valve body 16 from being deformed when the syringe 88 is inserted, from being excessively restrained by the most distal end surface 83 of the outer claw portion 78. As a result, the elastic valve body 16 can be prevented from being damaged due to the insertion of the male connector (syringe 88) while ensuring the clamping action of the elastic valve body 16 by the inner and outer claws 62 and 78.

  Furthermore, at the protruding tip portion (locking portion 64) of the inner claw portion 62, since the most distal end surface 64a is biased toward the outer peripheral side with respect to the radial center, the elastic valve body is formed at the outer peripheral portion of the locking portion 64. While the support of 16 is achieved, the thickness of the elastic valve body 16 is secured at the inner peripheral portion of the locking portion 64, and the durability can be improved.

  Further, since the inner peripheral surface of the inner claw portion 62 is the curved inner peripheral surface 66 having a curved cross-sectional shape, the elastic valve body 16 is deformed along the curved inner peripheral surface 66 when the syringe 88 is inserted. Be punished. As a result, it is possible to reduce the risk of stress concentration and tear in the deformed elastic valve body 16.

  Further, since the outer peripheral surface 64b has a steeper inclination angle than the inner peripheral surface 64c in the locking portion 64 that is the protruding tip portion of the inner claw portion 62, the elastic valve body is inserted when the syringe 88 is inserted. When the inner peripheral surface of the lower support portion 34 of the tubular support portion 22 abuts on the outer peripheral surface 64b of the locking portion 64 when the inner support portion 16 is pushed inward in the axial direction, the elastic valve element 16 causes the inner pawl portion to move. It can be prevented from falling out from between the axial direction between 62 and the outer claw portion 78.

  Furthermore, in the present embodiment, when the elastic valve body 16 is mounted on the housing 12, the outer protruding portion 18b of the elastic valve body 16 is radially compressed by the outer claw portion 78. That is, the elastic valve body 16 applies a force to the outer claw portion 78 radially outward. Accordingly, when the top surface (upper end surface) of the elastic valve body 16 is pushed down by the tip of the syringe 88, the peripheral edge of the top surface of the elastic valve body 16 can be made to follow the inner peripheral surface 78 a of the outer claw portion 78. It is possible to reduce the risk of the annular connecting portion (first thin portion) 24 being squeezed by the tip of the syringe 88. In particular, when the outer claw portion 78 is provided with the inclined surface 82a, the compression width of the elastic valve body 16 by the cylindrical inner peripheral surface 81 of the outer claw portion 78 is at least partly in the axial direction, in the radial direction of the inclined surface 82a. It is preferably larger than 1/2 of the width dimension.

  In the present embodiment, the inclined surface 82a is formed on the outer claw portion 78, so that the entire inner peripheral surface 78a of the outer claw portion 78 compresses the outer protruding portion 18b, while the inner surface 78a is compressed more than the axially inner portion. The compressive force of the outer claw 78 is greater in the outer portion. Thereby, when the top surface of the elastic valve body 16 is pushed down by the tip of the syringe 88, it is possible to cause the peripheral edge of the top surface of the elastic valve body 16 to follow the inner peripheral surface 78a of the outer claw portion 78, and the syringe 88. It is possible to reduce the insertion resistance and improve the restoration of the outer protruding portion 18b to the initial position when the syringe 88 is removed. In the inner claw portion 62, no compression force is applied radially inward to the elastic valve body 16 (inward protruding portion 18a), or the inner claw portion 62 is compressed radially inward by the outer claw portion 78. It is preferable that only a force smaller than the force acts.

In addition, the axial length B _{2 of} the enlarged diameter inner peripheral surface 82 provided at the protruding tip portion of the outer claw portion 78 is determined by the distance T ₁ between the facing surfaces of the most distal surfaces 64a and 83 of the inner and outer claw portions 62 and 78. Has been bigger than. As a result, the axial length B ₂ of the radially expanded inner peripheral surface 82, and thus the maximum thickness dimension T ₃ of the third thin portion 89b, can be sufficiently secured, and the elastic valve element 16 associated with the insertion of the syringe 88 can be secured. Tear can be prevented more effectively.

  Although the embodiments of the present invention have been described above, the present invention should not be limitedly interpreted by the specific description of the embodiments, and various changes, modifications, improvements, etc., based on the knowledge of those skilled in the art. Can be implemented in a mode in which is added.

  For example, in the above-described embodiment, the housing 12 is composed of three parts, that is, the base member 38, the inner housing 40, and the outer housing 42. However, for example, the base member and the inner housing may be integrally formed. The specific shape and structure of the housing 12 are not limited.

  Further, the shape of the elastic valve body is not limited. For example, in the above-described embodiment, the lower support portion 34 of the tubular support portion 22 forming the outer peripheral portion of the elastic valve body 16 extends to a position far below the lower end surface of the elastic valve body 16, but for example, the elastic valve The length may be up to a position substantially equal to the lower end surface of the body. Further, the circumferential groove (concave groove portion) 30 provided on the lower end surface of the elastic valve body may be discontinuous in the circumferential direction, and is not essential.

  Further, in some embodiments of the present invention, the inclined surface 82a on the inner peripheral surface 78a of the outer claw portion 78 is not essential, and the inner peripheral surface of the outer claw portion 78 has a straight cylindrical shape over the entire axial length. It is also possible to On the contrary, according to the embodiment of the present invention, the straight portion 81a of the cylindrical inner peripheral surface 81 of the outer claw portion 78 is not essential, and the inner peripheral surface of the outer claw portion 78 has the entire axial length. A tapered shape or a staircase shape may be used. In short, the tubular inner peripheral surface extending in the axial direction with the inner diameter dimension within the range of 3.9 to 4.5 mm in the outer claw portion 78 is substantially continuous in the axial direction and has a predetermined length (of the outer claw portion). 1/3 or more), for example, it is not necessary to have a portion with a constant inner diameter dimension, it may be included in a part, or the inner diameter dimension is constant over the entire length. May be said.

  Even when the inclined surface 82a is provided on the inner peripheral surface 78a of the outer claw portion 78, it is not necessary to provide the continuous inclined surface 82a over the entire circumference of the inner peripheral surface 78a to form a tapered shape. The inclined surface 82a may be partially provided in the circumferential direction, or the inclination angle θ may be different in the circumferential direction.

  Further, the enlarged diameter inner peripheral surface 82 of the outer claw portion 78 may be extended in the axial direction with an inner diameter dimension larger than the minimum inner diameter set on the upper end side of the outer claw portion 78, for example, with a constant inner diameter in the axial direction. It is also possible to adopt a mode having a cylindrical surface, and specifically, in place of the inclined surface 82a of the embodiment, a stepped surface or a stepped surface that expands linearly or curvedly is used to increase the diameter. You may comprise a peripheral surface.

  Further, in the above-described embodiment, the enlarged diameter inner peripheral surface 82 of the outer claw portion 78 includes the inclined surface 82a that linearly increases the diameter at the constant inclination angle θ. The diameter may be expanded with a curved surface whose inclination angle changes in the axial direction like an arcuate curved cross section that is convex inward over the entire surface. A suitable range of the inclination angle θ ′ of the radially expanded inner peripheral surface 82 formed of a curved surface can be set with an average inclination angle.

  When the radially expanded inner peripheral surface 82 of the outer claw portion 78 is formed of the stepped surface, the stepped surface, or the like as described above, the maximum inner diameter points located at both axial ends of the radially expanded inner peripheral surface 82. With a slanting line connecting the minimum inner diameter point with the slanting line, a preferable range of the slant angle θ ′ of the radially expanded inner peripheral surface 82 can be set.

10: medical valve, 12: housing, 14: opening (port for male connector connection), 16: elastic valve body, 18: central portion, 18b: outward protrusion (on the inner peripheral side of the outer locking groove) Positioned central portion), 24: annular connecting portion (first thin portion), 26: inner locking groove, 26c: inner peripheral surface of inner locking groove, 28: outer locking groove, 30: concave groove portion (circumferential groove) ), 62: inner claw portion, 64: locking portion (the tip portion of the inner claw portion), 64a: the leading edge surface of the inner claw portion, 64b: the outer peripheral surface at the tip portion of the inner claw portion, 64c: the inner claw portion Inner peripheral surface at tip portion, 66: curved inner peripheral surface, 78: outer claw portion, 78a: inner peripheral surface of outer claw portion, 81: cylindrical inner peripheral surface, 82: inner diameter expanded surface, 82a: inclined surface , 83: the most distal surface of the outer claw portion, 88: syringe (male connector), 89a: second thin portion, 89b: third thin portion

Claims (13)

A port for connecting a male connector to which a disc-shaped elastic valve body is mounted is provided, and is formed in the housing with respect to an inner locking groove and an outer locking groove formed in an outer peripheral portion of the elastic valve body. In the medical valve in which the inner and outer claws are locked and supported,
At the axially outer end portion of the inner peripheral surface of the outer pawl portion that is superposed on the outer locking groove of the elastic valve body, the inner diameter dimension is 3.9 to 4.5 mm and the axial length is the same. A cylindrical inner peripheral surface that is 1/3 or more of the outer claw portion is formed, and an inner diameter dimension of the inner peripheral surface of the inner claw portion that is superposed on the inner locking groove of the elastic valve body is A medical valve characterized in that it is made larger than the inner diameter of the cylindrical inner peripheral surface of the outer claw portion. A port for connecting a male connector to which a disc-shaped elastic valve body is mounted is provided, and is formed in the housing with respect to an inner locking groove and an outer locking groove formed in an outer peripheral portion of the elastic valve body. In the medical valve in which the inner and outer claws are locked and supported,
The inner surface of the elastic valve body is provided with a peripheral groove that continuously extends from the inner locking groove to the inner peripheral side, while the inner peripheral surface of the outer pawl portion gradually extends inward in the axial direction. An inclined surface that expands in diameter is provided, and the inclination angle θ of the inclined surface is larger than 45 degrees, and at least a part of the circumferential groove in the radial direction is with respect to the inclined surface of the outer claw portion. A medical valve characterized by being axially opposed to each other.   The medical valve according to claim 2, wherein the circumferential groove of the elastic valve body extends radially inward from an inner circumferential surface of the outer claw portion. A port for connecting a male connector to which a disc-shaped elastic valve body is mounted is provided, and is formed in the housing with respect to an inner locking groove and an outer locking groove formed in an outer peripheral portion of the elastic valve body. A medical valve in which an inner claw portion and an outer claw portion are locked and supported,
In the outer peripheral portion of the elastic valve element, a space between the facing surfaces of the most distal surfaces of the outer claw portion and the inner claw portion is a first thin portion having a minimum thickness, and On the circumferential side, a second thin portion is provided which is gradually thickened toward the center by an inner peripheral surface of the inner pawl portion which is inclined up to the opening end of the inner locking groove. A medical valve characterized in that a third thin-walled portion is provided on the inner peripheral side of the thin-walled portion, the third thin-walled portion gradually becoming thicker toward the center by the inclined inner peripheral surface of the outer claw portion.   The inner radius of the most distal surface of the outer claw portion and the inner radius of the most distal surface of the inner claw portion are compared with the axial facing distance between the most distal surfaces of the outer claw portion and the inner claw portion. The medical valve according to claim 4, wherein the dimensional difference is smaller. A port for connecting a male connector to which a disc-shaped elastic valve body is mounted is provided, and is formed in the housing with respect to an inner locking groove and an outer locking groove formed in an outer peripheral portion of the elastic valve body. A medical valve in which an inner claw portion and an outer claw portion are locked and supported,
At the tip portion of the inner claw portion that is fitted and locked in the inner locking groove of the elastic valve body, the tip end surface is biased to the outer peripheral side with respect to the radial center of the tip portion, The medical valve, wherein the minimum inner diameter of the tip portion of the inner claw portion is larger than the inner diameter of the most distal end surface of the outer claw portion.   The inner peripheral surface of the inner claw portion is a curved inner peripheral surface having a curved cross-sectional shape that is convex toward the inner peripheral side, and the curved inner peripheral surface extends further inward than the tip portion. The medical valve according to claim 6, wherein the elastic valve body is deformed so as to overlap the curved inner peripheral surface by connecting the male connector. A port for connecting a male connector to which a disc-shaped elastic valve body is mounted is provided, and is formed in the housing with respect to an inner locking groove and an outer locking groove formed in an outer peripheral portion of the elastic valve body. In the medical valve in which the inner and outer claws are locked and supported,
The inner peripheral surface of the inner claw portion is a curved inner peripheral surface having a curved cross-sectional shape that is convex toward the inner peripheral side, and the curved inner peripheral surface corresponds to the inner locking groove of the elastic valve body. While extending and expanding to the outside, the minimum inner diameter of the curved inner peripheral surface is made larger than the minimum inner diameter of the outer claw portion,
A medical valve characterized in that an outer peripheral surface of a tip portion of the inner claw portion fitted and locked in the inner locking groove has a steeper inclination angle closer to the axial direction than the inner peripheral surface. .. A port for connecting a male connector to which a disc-shaped elastic valve body is mounted is provided, and is formed in the housing with respect to an inner locking groove and an outer locking groove formed in an outer peripheral portion of the elastic valve body. In the medical valve in which the inner and outer claws are locked and supported,
The inner diameter of the axially outer end portion of the inner peripheral surface of the outer pawl portion, which is superposed on the outer locking groove of the elastic valve body, is set within the range of 3.9 to 4.5 mm, and The medical valve, wherein the elastic valve body is radially compressed by the outer claw portion.   The outer diameter of the central portion of the elastic valve body located on the inner peripheral side of the outer locking groove is larger than the inner diameter of the outer claw portion locked in the outer locking groove, 10. The depth dimension of the outer locking groove is made smaller than the axial projection dimension of the outer claw portion, and the elastic valve body is compressed in the radial direction and the axial direction by the outer claw portion. The medical valve described.   The outer peripheral surface of the central portion of the elastic valve body, which is located on the inner peripheral side of the outer locking groove, has the entire length in the axial direction from the bottom end of the outer locking groove to the opening side end and the entire circumferential direction. The medical valve according to claim 9 or 10, wherein the entire surface is compressed in the radial direction by the inner peripheral surface of the outer claw portion.   12. The radial compression force of the outer claw portion of the elastic valve body is greater in the outer side portion than in the inner side portion in the axial direction of the elastic valve body. Medical valve. A port for connecting a male connector to which a disc-shaped elastic valve body is mounted is provided, and is formed in the housing with respect to an inner locking groove and an outer locking groove formed in an outer peripheral portion of the elastic valve body. In the medical valve in which the inner and outer claws are locked and supported,
An inner peripheral surface of the outer claw portion is provided with an inner peripheral surface whose diameter is enlarged on the axially inner end side, and the axial length of the inner peripheral surface of the enlarged diameter is the inner side. A medical valve, characterized in that the distance between the axially opposed surfaces of the most distal surfaces of the claw portion and the outer claw portion is equal to or more.

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