JP6399317B2 - Medical connector and method for manufacturing medical connector - Google Patents

Description

  TECHNICAL FIELD The present invention relates to a medical connector that enables connection of a medical connector (male connector) to an infusion route and the like, and a method of manufacturing the same, when performing mixed injection of chemical liquids or collection of body fluids using the infusion route. It is.

  Conventionally, a male connector, such as a luer tip at the tip of a syringe, has been connected to an infusion route for infusion or blood collection in order to mix medicinal fluids or collect body fluids using the infusion route. In many cases, a medical connector is provided. For example, in a three-way cock that constitutes a part of an infusion route, an infusion route such as an infusion is formed using a pair of three openings, and a male connector can be connected to the remaining one opening. By providing a medical connector, it is possible to co-inject a chemical solution using an existing infusion route.

  As such a medical connector, for example, a so-called split septum type connector described in Japanese Patent Application Laid-Open No. 2-502976 (Patent Document 1) is known. The split septum type medical connector has a structure with a disc-shaped elastic valve body in the opening. By inserting the tip of the male connector directly into the slit of the elastic valve body and pushing the slit open, Enables internal communication between the route and male connector.

  By the way, in the medical connector described in Patent Document 1, the outer end of the elastic valve body is sandwiched in the axial direction by bending the open end of the housing to the inner periphery by swaging or the like. ing.

  However, in such a support structure of the elastic valve body, it is difficult to define the deformation amount when bending the opening end of the housing, and accordingly, it is difficult to support the elastic valve body with a certain force. Therefore, when the elastic valve body is mounted on the housing, individual differences may occur in the opening / closing characteristics of the slit and the durability of the elastic valve body in the support portion. Moreover, in the structure described in Patent Document 1, the elastic valve body may be attached to the housing in an inclined manner because the deformation amount of the opening end of the housing varies on the circumference. As a result, when the male connector is inserted / removed from / to the slit of the elastic valve body, a large stress is locally applied to the elastic valve body on the circumference, and the elastic valve body is deformed into a strain so that it is deformed from the housing. There may be a problem of dropping out.

  In addition, in the prior application Japanese Patent Application Laid-Open No. 2009-11820 (Patent Document 2), the applicant uses a separate ring member inserted into the opening of the housing, and uses the ring member and the housing base. A structure is proposed in which an elastic valve body is sandwiched between and supported. In the medical connector according to Patent Document 2, for example, the housing opening is bent and the ring member is pushed in until the upper surface of the ring member and the upper surface of the central portion of the elastic valve body are located on the same plane. It is possible to set the relative position of the ring member with respect to the housing, but since it is configured to melt the housing opening and cover the ring, it is easy for variations in melting, and pressure is applied to the elastic valve body unevenly, There is a possibility that the positional relationship of each member may vary, and a means for positioning with higher accuracy has been demanded. In addition, in the conventional method, it is difficult to define an appropriate amount of pushing, and if it is pushed too much, the elastic valve body sinks excessively, or the elastic valve body is deformed during processing, resulting in pressure dispersion when the male luer is inserted. If the positional relationship of each member is varied such that a suitable balance is lost, and there is a fear that sufficient fixing strength cannot be realized when the indentation is insufficient, very high level control / adjustment is required during the melting process.

JP-T-2-502976 JP 2009-11820 A

  The present invention has been made in the background of the above-described circumstances, and the problem to be solved is an improvement in which the elastic valve body can be attached to the housing in a substantially constant state with little variation. It is to provide a medical connector and a manufacturing method thereof.

  Hereinafter, the aspect of this invention made | formed in order to solve such a subject is described. In addition, the component employ | adopted in each aspect as described below is employable by arbitrary combinations as much as possible.

That is, the first aspect of the present invention is a method of manufacturing a medical connector, which is made of a thermoplastic resin having an opening in which a valve seat for supporting an outer peripheral portion of a disk-like elastic valve body is formed. A housing preparation step of preparing a housing, and a ring member made of a thermoplastic resin that is attached to the opening of the housing and clamps an outer peripheral portion of the elastic valve body with the valve seat, the housing A ring member preparation step for preparing a fitting member having a fitting convex portion to be inserted into the opening portion, and a valve body setting step for setting the elastic valve body at the valve seat of the housing and setting the opening portion in the opening portion. When the superposing a ring member to the housing in which the elastic valve body is set at the outer peripheral side of the fitting protrusion of the ring member, overlapping engagement of their housing and the ring member A melting step for melting the welding convex portion protruding from the cutting surface, and the welding convex portion is crushed in the melting step and the welding convex portion is crushed and the overlapping surface of the housing and the ring member comes into contact with each other by sticking integrally coupled with the housing and the ring member the solution in protruding portion pressed by their housing and the ring member to the approaching direction until the area is increased, the valve seat and the ring of該Ha maggot ring And a valve body fixing step of holding the outer peripheral portion of the elastic valve body with a member.

  According to the manufacturing method of the medical connector according to the first aspect as described above, since the welding convex portion provided between the housing and the ring member is melted and the housing and the ring member are fixed, Compared to the method, melting variations are less likely to occur, and a situation in which pressure is applied unevenly to the elastic valve body is less likely to occur. Furthermore, since the welding convex portion is easy to melt, it is easy to push in. However, when the welding convex portion is completely melted, the surfaces of the housing and the ring member come into contact with each other, making it difficult to push in. For this reason, advanced control / adjustment is not required, and variations are much less likely to occur than in the past.

  In addition, the housing and the ring member are integrally connected and fixed together by melting the welding convex portion, so that the welding convex portion protrudes on the overlapping surface of the housing and the ring member, and the housing and the ring member are strengthened. The elastic valve body can be stably supported by fixing.

  According to a second aspect of the present invention, in the method for manufacturing a medical connector described in the first aspect, the length from the overlapping surface to the tip end portion is uniform in the overlapping surface of the housing and the ring member. The formed welding convex portion is provided continuously over the entire circumference or intermittently in the circumferential direction.

  According to the second aspect, the contact portion of the welding convex portion is provided in an annular shape in the circumferential direction, and the housing and the ring member are integrally connected and fixed over the entire circumference, thereby further strengthening the housing and the ring member. Adherence can be realized. Furthermore, by fixing the housing and the ring member continuously over the entire circumference, stress can be prevented from concentrating on the circumferential end of the fixed portion, and the problem that the ring member is peeled off from the housing more reliably. Can be prevented. Further, since it is possible to prevent pressure from being applied unevenly to the elastic valve body, it is difficult to cause positional displacement of the elastic valve body after fixing, and it is possible to more reliably prevent a problem that the ring member is peeled off from the housing.

  According to a third aspect of the present invention, in the method for manufacturing a medical connector described in the first or second aspect, as the elastic valve body, an annular recess that opens in the inner and outer surfaces of the outer peripheral portion and extends in the circumferential direction is provided. While adopting a structure provided with a groove, while adopting the structure of the valve seat provided with an annular convex portion inserted into the annular concave groove provided on the inner surface of the elastic valve body as the housing, As the ring member, a structure in which an annular convex portion to be inserted into the annular concave groove provided on the outer surface of the elastic valve body is adopted, and in the valve body setting step, the annular shape of the inner surface of the elastic valve body is adopted. The annular convex portion of the valve seat of the housing is inserted into the concave groove and set, and in the melting step and the valve body fixing step, the annular concave groove on the outer surface of the elastic valve body is The ring-shaped convex part of the ring member is By placing, in which fitted by pushing the respective annular protrusions for each annular groove of the inner and outer surfaces of the elastic valve body.

  According to the third aspect, the elastic valve body is set in a state where it is positioned to some extent in the opening of the housing by inserting the annular convex portion of the housing into the annular concave groove on the inner surface of the elastic valve body in the valve body setting step. It is possible to facilitate the manufacturing work in the melting step and the valve body fixing step. Further, by inserting the annular convex portion of the ring member into the annular concave groove on the outer surface of the elastic valve body and setting the ring member in a state where it is positioned to some extent with respect to the elastic valve body and the housing, the melting step and the valve body fixing step In this case, when the housing and the ring member are pressed in the approaching direction, relative displacement between the housing and the ring member is unlikely to occur. Furthermore, by fixing the housing and the ring member and inserting and fitting the respective annular convex portions into the respective annular concave grooves on the inner and outer surfaces, the annular convex portion is locked to the inner surface of the annular concave groove and the elastic valve. The body can be positioned relative to the housing and the ring member. Accordingly, the housing, the ring member, and the elastic valve body can be positioned with respect to each other not only in the approaching direction but also in the direction orthogonal thereto, and can be fixed with high accuracy.

  According to a fourth aspect of the present invention, there is provided a method for manufacturing the medical connector according to any one of the first to third aspects, wherein the housing and the ring member are overlapped in the melting step. The contact portion of the welding convex portion is melted by applying ultrasonic vibration.

  According to the fourth aspect, it is relatively easy to selectively melt only the contact portion of the welding convex portion by adjusting the frequency and the output, and the housing and the portion at the portion where the welding convex portion is removed. While the ring member is positioned by contact, the housing and the ring member can be fixed at the contact portion of the welding convex portion.

  A fifth aspect of the present invention is the method for manufacturing a medical connector according to any one of the first to fourth aspects, wherein the ring member is inserted into the opening of the housing. A structure provided with a fitting convex portion that is positioned in the radial direction with respect to the inner peripheral surface of the opening of the housing is adopted, and the fitting convexity of the ring member is used in the melting step and the valve body fixing step. The welding convex portion is melted in a state where the portion is inserted into the opening of the housing.

  According to the 5th aspect, a housing and a ring member can be welded, positioning a ring member with respect to the opening part of a housing by inserting the fitting convex part of a ring member in the opening part of a housing. . Therefore, it is possible to prevent the relative displacement between the housing and the ring member not only in the approaching direction but also in the radial direction, and to connect and fix the housing and the ring member with high accuracy in the relative positional relationship of interest. it can.

  Further, if the outer peripheral surface of the fitting convex portion is formed into a cylindrical shape and overlapped with the inner peripheral surface of the opening portion of the housing over the entire circumference, the molten resin (weld) is melted inside the housing when the welding convex portion is melted. Intrusion into the circumferential side can be prevented, and deterioration of the elastic valve body due to contact with the heated resin is prevented. In addition, since the molten resin is filled in the minute gaps between the mating projections and the overlapping surfaces of the housing, an improvement in the fixing strength between the housing and the ring member can be expected.

A sixth aspect of the present invention is a medical connector in which a disc-shaped elastic valve body is assembled to an opening of a housing, and an outer peripheral portion of the elastic valve body is supported by the housing, A valve seat that supports the inner surface of the outer peripheral portion of the elastic valve body is formed at the opening of the housing, and the outer surface of the outer peripheral portion of the elastic valve body is fitted into the opening of the housing. A ring member having a mating convex portion is overlapped , and the housing and the ring member are directly fixed around the elastic valve body on the outer peripheral side of the fitting convex portion of the ring member. An outer peripheral portion of the elastic valve body is sandwiched between the valve seat and the ring member, and a fixed portion between the housing and the ring member projects between the overlapping surfaces of the housing and the ring member. Positioning that positions the housing and the ring member in the approaching direction when the welded convex portions are melted to provide the welded portions and the portions of the overlapped surfaces that are out of the welded convex portions contact each other It is characterized in that a portion is provided.

  According to the medical connector having the structure according to the sixth aspect of the present invention, the overlapping surface of the housing and the ring member is integrally connected and fixed at the welded portion where the welded convex portion is melted. At the same time, they are brought into contact with each other at the positioning portion which is a portion where the welding convex portion is removed. Thereby, the relative position of the approaching direction of the housing and the ring member can be set with high accuracy while realizing the firm fixation of the housing and the ring member. Accordingly, the outer peripheral portion of the elastic valve body is sandwiched excessively between the housing and the ring member, and the durability and deformation characteristics (spring constant) of the target elastic valve body can be stably and effectively obtained. For this reason, problems such as a decrease in the durability of the elastic valve body and an adverse effect on the switching characteristics between communication and blocking, and conversely, the elastic valve body will not be clamped with sufficient force and the elastic valve body will drop from the housing. Can also be avoided.

  In addition, mutual contact | abutting of the overlapping surface in a positioning part may be direct, and may be indirect via a welding convex part. That is, if the welding convex part is completely melted without substantially remaining, and the peripheral part including the welding convex part is positioned so that the housing and the ring member abut each other with a surface larger than the welding convex part. good.

  According to a seventh aspect of the present invention, in the medical connector according to the sixth aspect, the ring member is engaged with the housing, and the welding convex portion is formed after the housing and the ring member are overlapped with each other. The guide part which guides the movement of the said housing until the part which remove | deviated this welding convex part between the overlapping surfaces and contact | abutted mutually is formed.

  According to the seventh aspect, when the housing and the ring member are welded, the housing and the ring member are moved closer to each other while being guided by the guide portion, thereby preventing the housing and the ring portion from being displaced from each other at an appropriate position. It is fixed.

  According to an eighth aspect of the present invention, in the medical connector described in the sixth or seventh aspect, the welded portion is continuously formed over the entire circumference in the circumferential direction of the housing. The positioning portion is provided at a position where the welded portion deviates in the radial direction.

  According to the eighth aspect, since the welded portion is continuously formed over the entire circumference, the housing and the ring member can be firmly and stably fixed on the circumference. The elastic valve body is stably sandwiched between the members. Furthermore, by providing the positioning portion at a position where the welded portion is deviated in the radial direction, the positioning portion can be continuously provided over the entire circumference, and the housing and the ring member are fixed in a relatively inclined state. And the elastic valve body can be held more stably.

  According to a ninth aspect of the present invention, there is provided the medical connector according to any one of the sixth to eighth aspects, wherein the ring member is inserted into the opening of the housing. A fitting convex portion that is positioned in the radial direction with respect to the inner peripheral surface of the opening is provided.

  According to the ninth aspect, since the housing and the ring member are positioned in the radial direction by inserting the fitting convex portion into the opening of the housing, the positional deviation in the radial direction of the housing and the ring member is prevented. Can be prevented. In addition, the outer peripheral surface of the fitting convex portion has a shape corresponding to the inner peripheral surface of the opening portion of the housing, and the outer peripheral surface of the fitting convex portion is overlapped with the inner peripheral surface of the opening portion of the housing over the entire circumference. In this case, the molten resin of the welding convex portion is prevented from entering the inner peripheral side of the housing by being blocked by the fitting convex portion. In addition, since the molten resin enters between the overlapping surfaces of the fitting convex portion and the opening of the housing, the fixing strength between the housing and the ring member can be improved.

According to a tenth aspect of the present invention, there is provided a housing preparing step of preparing a thermoplastic resin housing having an opening in which a valve seat for supporting an outer peripheral portion of a disc-shaped elastic valve body is formed; A ring- shaped member made of a thermoplastic resin that is attached to the opening and sandwiches an outer peripheral portion of the elastic valve body with the valve seat, and is a fitting convex portion that is inserted into the opening of the housing a ring member preparation step of preparing those having a valve body setting step for setting said elastic valve body to the ring member, the superposed housing to the ring member to which the elastic valve body is set, the ring in the outer peripheral side of the fitting convex portion in the member, a melting step of melting the welding protrusion protruding from the overlapping surface of their housing and the ring member, wherein the welding projection in said melting step In the molten state, the housing and the ring member are pressed in the approaching direction until the welding convex portion is crushed and the contact area of the overlapping surface of the housing and the ring member is increased. by sticking integrally connected by solution alignment projection, and a valve body fixing step of clamping the peripheral portion of the elastic valve body in the valve seat and the ring member該Ha maggots ring, to have, characteristics And

  According to the method for manufacturing a medical connector according to the tenth aspect, as in the first aspect, the welded convex portion melts substantially uniformly, so that the elastic valve body sandwiched between the housing and the ring member Uneven pressure is unlikely to be applied, and the housing and the ring member are positioned in the approaching direction by increasing the contact area of the overlapping surface, thereby preventing excessive pressing. Further, by fixing the ring member on which the elastic valve body is set to the housing, the elastic valve body is inserted into the housing, so that the attachment of the valve body to the housing becomes easier.

  Further, when the outer peripheral portion of the elastic valve body is sandwiched between the housing and the ring member, the annular convex portion restricts the outer peripheral end portion of the elastic valve body from bulging and deforming toward the inner peripheral side. The area between the elastic valve body, the housing, and the ring member is sealed at the outer peripheral portion rather than the recess without requiring a special seal member.

  According to the present invention, it is possible to manufacture an improved medical connector in which the elastic valve body can be attached to the housing in a substantially constant state with little variation.

The perspective view of the medical connector as one Embodiment of this invention. The front view of the medical connector shown in FIG. The longitudinal cross-sectional view of the medical connector shown in FIG. The perspective view of the housing which comprises the medical connector shown in FIG. The front view of the housing shown in FIG. The longitudinal cross-sectional view of the housing shown in FIG. The perspective view of the elastic valve body which comprises the medical connector shown in FIG. The front view of the elastic valve body shown in FIG. The longitudinal cross-sectional view of the elastic valve body shown in FIG. The perspective view of the ring member which comprises the medical connector shown in FIG. The front view of the ring member shown in FIG. The longitudinal cross-sectional view of the ring member shown in FIG. The perspective view explaining the manufacturing process of the medical connector shown in FIG. FIG. 14 is a cross-sectional perspective view illustrating a manufacturing process of the medical connector shown in FIG. 13. The front view explaining the manufacturing process of the medical connector shown in FIG. The longitudinal cross-sectional view explaining the manufacturing process of the medical connector shown in FIG. The longitudinal cross-sectional view which expands and shows the principal part in the manufacturing process of the medical connector shown in FIG. The perspective view of a three-way cock provided with the medical connector shown in FIG. The front view of the three-way cock shown in FIG. Sectional model figure for demonstrating the connection method of the luer lock connector with respect to the medical connector shown in FIG. It is a perspective view which shows another example of use of the medical connector which concerns on this invention, Comprising: (a) shows a mixed injection plug, (b) shows a mixed injection pipe, (c) shows an infusion bag, respectively.

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

  1-3, the medical connector 10 as one Embodiment of this invention is shown. The medical connector 10 has a structure in which an elastic valve body 14 having a disk shape is assembled in a central hole of a housing 12 having a cylindrical shape, and an outer peripheral portion of the elastic valve body 14 is supported by the housing 12. . In the following description, the vertical direction means the vertical direction in FIG. 2 unless otherwise specified. Moreover, although FIGS. 1-20 shows the same embodiment, it is expanded or reduced suitably for legibility.

  More specifically, as shown in FIGS. 4 to 6, the housing 12 has a stepped cylindrical shape in which a large diameter cylindrical portion 16 and a small diameter cylindrical portion 18 are integrally formed. The inner diameter dimension of the small-diameter cylindrical portion 18 is such that at least the opening 20 (the upper opening in FIG. 6) can accommodate the elastic valve element 14, and the slit 50 (described later) after the male connector is removed is resealed. Is preferably made substantially equal to the outer diameter dimension of the elastic valve body 14 so that is stably expressed.

  The housing 12 is preferably formed of a material having a strength capable of reliably holding the elastic valve body 14, and specifically, a thermoplastic resin such as polypropylene, polyethylene, polyvinyl chloride, polycarbonate, polystyrene, polyacetal, or the like. Is exemplified. The housing 12 is molded from these materials by injection molding or the like.

  In addition, an annular valve seat 22 that protrudes radially inward is integrally formed on the small diameter cylindrical portion 18, and the inner peripheral edge of the valve seat 22 is formed outwardly in the opening direction of the small diameter cylindrical portion 18 ( In FIG. 6, a locking convex portion 24 is integrally formed as an annular convex portion projecting upward. The locking projection 24 has a peripheral wall shape that is continuous over the entire circumference with a constant protrusion height dimension, and an annular fitting groove 26 is formed by the valve seat 22 and the locking projection 24. , Opening toward the opening 20 of the housing 12. Further, a portion extending from the inner peripheral surface of the locking convex portion 24 to the inner peripheral surface of the valve seat 22 is a contact inner peripheral surface 28 that extends over the entire circumference in the circumferential direction with a curved convex shape. ing.

  Further, a male screw portion 30 into which a female screw portion 106 of a luer lock connector 102 described later is screwed is formed on the outer peripheral surface of the small diameter cylindrical portion 18. The male threaded portion 30 is preferably a female threaded portion of the luer lock connector 102 stipulated by ISO 594, in which the peak diameter of the screw is set to 7.0 ± 0.2 mm and the root diameter of the screw is set to 8.0 ± 0.1 mm. This is a double thread that can be connected to 106.

  Note that the outer diameter of the housing 12 is such that the standard luer tip 104 defined in ISO 594 can be connected. Is preferably set within a range of 6.0 to 7.0 mm, and when the male screw portion 30 is formed as in the present embodiment, the outer diameter of the small-diameter cylindrical portion 18 including a thread is provided. Is preferably set within a range of 7.0 to 8.0 mm.

  Moreover, the opening end surface 32 which is an axial direction end surface at the side of the small-diameter cylindrical portion 18 of the housing 12 is an annular flat surface having a substantially constant width dimension and continuing to the entire circumferential direction, and spreads in a direction substantially perpendicular to the axis. Yes.

  As shown in FIGS. 7 to 9, the elastic valve body 14 includes a disk-shaped central portion 34 having a substantially constant thickness dimension, and a substantially annular ring surrounding the outer periphery of the central portion 34 over the entire circumference. An annular fixing portion 36 having a shape is integrally provided, and is substantially disk-shaped as a whole. The elastic valve body 14 is formed of a material having elasticity, and is made of a material such as isoprene rubber or silicone rubber selected from synthetic rubber, natural rubber, thermoplastic elastomer and the like in consideration of airtightness and resealability. Is formed by press molding, molding, or the like.

  The annular fixing portion 36 continuously extends in the circumferential direction with a certain substantially rectangular cross-sectional shape. The rectangular cross section has an axial dimension (vertical dimension in FIG. 9) larger than a radial dimension (horizontal dimension in FIG. 9). Note that the axial dimension of the annular fixing portion 36 is smaller than the axial dimension of the central portion 34, and the axial upper end surface of the annular fixing portion 36 is inward of the axial upper end surface of the central portion 34 (see FIG. 9) (lower part of 9). This prevents the center portion 34 from protruding upward in the axial direction relative to the ring member 52 when a ring member 52 described later is superimposed on the upper side in the axial direction of the annular fixing portion 36.

  An inner annular groove 42 is formed on the inner surface 38 of the elastic valve body 14, and an outer annular groove 44 is formed on the outer surface 40. The inner and outer annular grooves 42 and 44 are continuous over the entire circumference with a substantially constant concave cross section, and are formed at substantially the same position in the radial direction of the elastic valve body 14. As a result, the thickness of the elastic valve body 14 is reduced at the portions where the inner and outer annular concave grooves 42 and 44 are formed, and the central portion 34 constituting the inner peripheral portion of the elastic valve body 14 and the annular portion constituting the outer peripheral portion. A constricted portion 46 that connects the fixed portion 36 is formed. Further, the constricted portion 46 is formed at a position slightly closer to the inner surface 38 in the thickness direction of the elastic valve body 14, and the central portion 34 of the elastic valve body 14 has an inner surface 38 on the outer surface 40 side than the constricted portion 46. The axial dimension is larger than the side.

  Further, on the inner peripheral side of the inner annular groove 42 on the inner surface 38, a concave groove portion 48 that continuously extends over the entire circumference with a curved concave sectional shape is formed. A concave groove 48 is opened in the side wall surface.

  The diameter of the central portion 34 of the elastic valve body 14 is preferably set within a range of 5.0 to 6.5 mm. If the diameter of the central portion 34 of the elastic valve body 14 is smaller than 5.0 mm, it becomes difficult to insert the luer tip 104 of the standard luer lock connector 102 whose outer diameter is unified to approximately 4.0 mm. Is larger than 6.5 mm, the outer diameter of the third branch opening 90 becomes large, and it becomes difficult to connect the female thread portion 106 of the standard luer lock connector 102.

  In addition, the thickness dimension of the central portion 34 of the elastic valve body 14 is preferably set within a range of 1.0 to 3.0 mm. If the thickness dimension of the central part 34 is smaller than 1.0 mm, the sealing performance at the time of insertion of a male connector such as a syringe tip may be insufficient, while the thickness dimension is larger than 3.0 mm. This is because the insertion resistance of the male connector increases and the insertion operation may become difficult.

  A slit 50 penetrating in the thickness direction is formed in the central portion 34. Here, as the shape of the slit 50, for example, a linear shape or a radial shape such as a cross is adopted. In the present embodiment, the slit 50 has a length that does not reach the outer peripheral edge from the center of the central portion 34 in the radial direction 3. Radial shape extending in the direction. The slit 50 is formed by, for example, passing a sharp blade in the thickness direction of the molded elastic valve body 14. Further, the slit 50 is in a cut-off state in which the inner surfaces are in close contact with each other based on the elasticity of the elastic valve body 14 in a mounted state of the elastic valve body 14 to be described later, thereby ensuring airtightness.

  The elastic valve body 14 is inserted into the opening 20 of the housing 12, and the inner surface of the annular fixing portion 36 is supported by the valve seat 22, so that the elastic valve body 14 is set in the opening 20 of the housing 12. Further, the elastic valve body 14 is prevented from being detached from the housing 12 by a ring member 52 fixed to the opening 20 of the housing 12.

  The ring member 52 is a hard member formed of a thermoplastic resin and is continuous in a substantially constant cross-sectional shape in the circumferential direction as shown in FIGS. Further, the ring member 52 has an inner periphery holding portion 54 having an outer diameter dimension substantially the same as the inner diameter dimension of the opening 20 of the housing 12 and an outer periphery having an outer diameter dimension substantially the same as the outer diameter dimension of the opening end surface 32 of the housing 12. The fixing portion 56 is integrally provided.

  A fitting convex portion 58 is provided on the inner circumferential clamping portion 54 of the ring member 52. The fitting convex portion 58 has a substantially constant cross-sectional shape and continuously extends over the entire circumference, protrudes below the lower surface of the outer peripheral fixing portion 56 and forms a step with the outer peripheral fixing portion 56. In addition, the outer diameter dimension is substantially the same as the inner diameter dimension of the opening 20 of the housing 12. Further, the outer peripheral surface of the annular fitting convex portion 58 is a substantially cylindrical surface extending in the axial direction, and is formed with an outer diameter that is substantially the same as the inner diameter of the opening 20 of the housing 12. Further, the outer peripheral edge portion of the projecting tip of the fitting convex portion 58 is tapered so as to gradually incline toward the projecting tip, and the projecting tip portion of the fitting convex portion 58 is tapered. The protruding tip of the fitting projection 58 is smaller in diameter than the inner diameter of the opening 20 of the housing 12.

  Furthermore, an annular convex portion 60 is provided on the inner peripheral clamping portion 54 of the ring member 52. The annular convex portion 60 is provided on the inner peripheral edge portion of the ring member 52, protrudes below the fitting convex portion 58, and has a cross-sectional shape that can be inserted into the outer annular concave groove 44 of the elastic valve body 14 in the circumferential direction. It is continuous over the entire circumference. Moreover, the annular convex part 60 is made into the taper shape from which an internal peripheral surface becomes gradually large diameter toward a protrusion front-end | tip, and is thin in radial direction toward a protrusion front-end | tip.

  Moreover, the outer periphery fixing | fixed part 56 of the ring member 52 has the lower surface which spreads in the substantially axis-perpendicular direction, and is provided with the welding convex part 62 which protrudes below. The welding convex portion 62 is a convex portion projecting from the radially intermediate portion of the outer periphery fixing portion 56, and has a substantially constant cross-sectional shape that becomes gradually narrower toward the projecting tip, and has a substantially uniform projecting height ( It is continuous over the entire circumference in the circumferential direction with a length from a contact surface 64 (described later) to a protruding tip surface. Further, the welding convex portion 62 is provided at a predetermined distance on the outer peripheral side with respect to the fitting convex portion 58, and the protruding height is made smaller than that of the fitting convex portion 58.

  Further, on the inner peripheral side of the welding convex portion 62, a contact surface 64 that forms the lower surface of the outer peripheral fixing portion 56 that is an overlapping surface with respect to the housing 12 is formed. The contact surface 64 is an annular flat surface that extends with a substantially constant width over the entire circumference and extends in a direction substantially perpendicular to the axis, and is provided between the welding convex portion 62 and the fitting convex portion 58 in the radial direction. And located above the fitting convex portion 58. Note that, on the outer peripheral side of the welding convex portion 62, the lower surface of the outer peripheral fixing portion 56 is located above the contact surface 64, and the outermost peripheral end portion of the outer peripheral fixing portion 56 is more than the portion where the contact surface 64 is formed. It is said to be thin.

  Then, with the elastic valve element 14 set in the opening 20 of the housing 12, the ring member 52 is fixed to the opening 20 of the housing 12, and the inner peripheral portion of the ring member 52 is the outer peripheral portion of the elastic valve element 14. Is overlaid on the outer surface. Thereby, the outer peripheral part of the elastic valve body 14 is clamped in the axial direction between the housing 12 and the ring member 52, and the medical connector 10 is formed. In the present embodiment, the annular fixing portion 36 of the elastic valve body 14 is clamped in the axial direction between the valve seat 22 of the housing 12 and the inner peripheral clamping portion 54 of the ring member 52, while the housing 12 The locking projection 24 is inserted and locked into the inner annular groove 42 of the elastic valve body 14, and the annular projection 60 of the ring member 52 is inserted into the outer annular groove 44 of the elastic valve body 14. It is locked.

  By the way, when the medical connector 10 of this embodiment fixes the housing 12 and the ring member 52 and clamps the elastic valve body 14 between the housing 12 and the ring member 52, the housing 12 and the ring member 52 are mutually connected. It is firmly fixed in a state where it is positioned on. Hereinafter, the manufacturing process of the medical connector 10 will be described with reference to FIGS.

  First, a housing 12 made of thermoplastic resin is prepared. As described above, the housing 12 has a tubular shape as a whole, and a valve seat 22 that supports the outer peripheral portion of the disc-shaped elastic valve body 14 is formed on the inner peripheral side of the opening 20. Has been. The housing 12 can be obtained by, for example, injection molding or molding of a thermoplastic resin. Thus, the housing preparation process is completed.

  Further, a ring member 52 made of a thermoplastic resin is prepared. The ring member 52 is attached to the opening 20 of the housing 12 so as to sandwich the outer peripheral portion of the elastic valve body 14 with the valve seat 22 of the housing 12. The ring member 52 can be obtained by injection molding or molding of a thermoplastic resin, like the housing 12. The ring member preparation process is thus completed.

  Further, as shown in FIGS. 13 to 16 (a) and (b), the outer peripheral portion of the elastic valve body 14 prepared in advance is supported by the valve seat 22 of the housing 12, and the opening portion 20 of the housing 12. Set to. More specifically, the annular fixing portion 36 of the elastic valve body 14 is inserted into the fitting concave groove 26 of the valve receiving seat 22 of the housing 12, and the locking convex portion 24 of the valve receiving seat 22 is inserted into the elastic valve body 14. The elastic valve element 14 is positioned and set in the opening 20 of the housing 12 by being inserted and locked in the inner annular groove 42. Thus, the valve body setting process is completed. Although it is possible to improve the sealing performance by fixing the annular fixing portion 36 and the inner surface of the fitting concave groove 26 with an adhesive or the like, in the present embodiment, it is inserted without fixing.

  Next, as shown in (c) of FIGS. 13 to 16, the ring member 52 is superimposed on the opening end surface 32 of the housing 12 in which the elastic valve body 14 is installed. More specifically, the annular member 60 is inserted into the outer annular groove 44 of the elastic valve body 14 so that the ring member 52 is positioned in the radial direction with respect to the housing 12 while the ring member 52 is positioned in the housing. 12, the welding convex portion 62 protruding from the outer peripheral fixing portion 56 of the ring member 52 is brought into contact with the opening end surface 32 of the housing 12. In the present embodiment, the fitting convex portion 58 of the ring member 52 is inserted into the opening portion 20 of the housing 12 before the welding convex portion 62 and the opening end surface 32 of the housing 12 are in contact with each other. It is positioned in the radial direction with respect to the inner peripheral surface of the opening 20.

  Further, the welding projection 62 abutted on the opening end surface 32 is melted in a state where the ring member 52 is superimposed on the opening end surface 32 of the housing 12. That is, as shown in FIGS. 15 and 16 (c), (c ′) and FIG. 17, the horn 70 is pressed against the ring member 52 to apply ultrasonic vibration to the welded convex portion 62 of the ring member 52. Then, frictional heat is generated at the contact portion between the tip end surface of the welding convex portion 62 and the opening end surface 32 of the housing 12 to melt the contact portion between the welding convex portion 62 and the opening end surface 32 of the housing 12. In the present embodiment, the housing 12 and the ring member 52 have a diameter by melting the contact portion of the welding convex portion 62 in a state where the fitting convex portion 58 of the ring member 52 is inserted into the opening portion 20 of the housing 12. It is possible to melt the welding convex portion 62 in a state positioned in the direction. Further, by appropriately adjusting the frequency of the ultrasonic vibration transmitted from the horn 70 to the ring member 52 and setting so that only the welding convex portion 62 of the ring member 52 is melted, the welding convex portion 62 is removed. Further, the housing 12 and the ring member 52 are prevented from melting on the inner peripheral side and the shape is maintained. As described above, the melting step is performed.

  In addition, when the housing 12 and the ring member 52 approach each other, the housing 12 and the ring member 52 move in the radial direction because the outer peripheral surface of the fitting convex portion 58 moves while sliding on the inner peripheral surface of the opening 20 in the housing 12. It is welded without displacement. As is clear from this, the guide portion for guiding the approaching displacement between the housing 12 and the ring member 52 is constituted by the fitting convex portion 58.

  In the present embodiment, the opening end face 32 of the housing 12 and the ring member 52 are more firmly fixed by causing the resin of the welding convex portion 62 that has been heated and melted to enter the outer peripheral side outside the welding convex portion 62. However, for example, the housing 12 and the ring member 52 may be arranged to face each other in the axial direction with a gap on the outer peripheral side of the welding projection 62. Further, the housing 12 and the ring member 52 are opposed to each other in the axial direction with a gap on both the inner and outer circumferences outside the welding projection 62 in a state where the tip end surface of the welding projection 62 is in contact with the opening end surface 32 of the housing 12. The gap functions as a space for preventing the molten resin of the welding convex portion 62 from protruding from between the opposing surfaces of the opening end surface 32 and the outer peripheral fixing portion 56.

  Next, under the molten state of the welding convex portion 62 in the melting step, the welding convex portion 62 is crushed, and the contact area between the opening end surface 32 of the housing 12 and the lower surface of the ring member 52 that are overlapped with each other increases. Until the housing 12 and the ring member 52 are pressed in the approaching direction. That is, in this embodiment, until the welding convex part 62 is crushed and the contact surface 64 of the ring member 52 contacts the opening end surface 32 of the housing 12, the contact area between the housing 12 and the ring member 52 increases. Then, the housing 12 and the ring member 52 are pressed in the approaching direction. In the present embodiment, the ring member 52 is pressed in the approaching direction against the housing 12 while the fitting convex portion 58 of the ring member 52 is inserted into the opening 20 of the housing 12, so that the ring member 52 is moved to the housing 12. Can be made to approach while positioning.

  Further, by pressing the ring member 52 in the approaching direction with respect to the housing 12, the locking convex portion 24 of the housing 12 and the annular convexity of the ring member 52 against the inner and outer annular concave grooves 42 and 44 of the elastic valve body 14. Push in part 60 and fit. As a result, the annular fixing portion 36 is sandwiched between the valve seat 22 of the housing 12 and the fitting convex portion 58 of the ring member 52 at the outer peripheral portion of the elastic valve body 14 and is compressed and deformed. It is sandwiched between the locking projection 24 of the housing 12 and the annular projection 60 of the ring member 52 and is compressed and deformed as necessary.

  Then, as shown in FIGS. 15 and 16 (d) and FIG. 17 (b), the housing 12 and the ring member 52 are held in a pressed state in the approaching direction, and the contact portion of the melted welding convex portion 62 is held. By cooling and solidifying, the housing 12 and the ring member 52 are fused and integrated at the contact portion of the welding projection 62, and are integrally connected and fixed. In the present embodiment, the housing 12 and the ring member 52 are continuously fixed over the entire circumference by melting the welding convex portion 62 over the entire circumference. Thereby, the outer peripheral part of the elastic valve body 14 set in the opening 20 of the housing 12 is sandwiched between the valve seat 22 of the housing 12 and the ring member 52, and the melting process and the valve body fixing process are completed. . In the present embodiment, the annular fixing portion 36 of the elastic valve body 14 is sandwiched between the valve seat 22 of the housing 12 and the fitting convex portion 58 of the ring member 52, and the locking convex portion 24 and the ring of the housing 12 are sandwiched. The constricted portion 46 of the elastic valve body 14 is sandwiched between the annular convex portion 60 of the member 52. By the above, the manufacturing process of a medical connector can be completed and the medical connector 10 which concerns on this embodiment can be obtained.

  In the medical connector 10 manufactured in this way, as shown in FIG. 17B, the contact portion between the welding convex portion 62 of the ring member 52 and the opening end surface 32 of the housing 12 is melted by ultrasonic welding. The weld portion 66 is integrated, and the weld portion 66 is continuously provided over the entire circumference. On the other hand, on the inner peripheral side where the welding projection 62 is radially removed, the positioning portion where the opening end surface 32 of the housing 12 and the contact surface 64 of the ring member 52 that are substantially maintained in shape are in contact with each other in the axial direction. 68 is continuously provided over the entire circumference. In addition, when the molten resin of the welding convex portion 62 enters the positioning portion 68, the opening end surface 32 of the housing 12 and the abutting surface 64 of the ring member 52 indirectly abut on the positioning portion 68, and the housing 12 The ring member 52 may be bonded at the positioning portion 68.

  In the present embodiment, annular flat surfaces are provided at portions where the welding convex portions 62 of the ring member 52 are separated from the inner peripheral side and the outer peripheral side, respectively, and the welding convex portions 62 are formed on the inner and outer peripheral flat surfaces. By being completely melted, the housing 12 is superposed on a flat surface with a flat surface so as to be positioned while preventing melting.

  According to the medical connector 10 according to the present embodiment having such a structure, the opening end surface 32 of the housing 12 and the contact surface 64 of the ring member 52 are in contact with each other in the positioning portion 68, so that the housing 12 The ring member 52 is positioned with high accuracy in the axial direction. Therefore, excessive approach between the valve seat 22 of the housing 12 and the inner peripheral clamping portion 54 of the ring member 52 is avoided, and excessive elasticity of the elastic valve body 14 held between the housing 12 and the ring member 52 is obtained. Since deformation is prevented, the desired deformation characteristics (spring characteristics) and durability of the elastic valve body 14 can be obtained effectively. In particular, in a state where the outer peripheral portion of the elastic valve body 14 is sandwiched between the housing 12 and the ring member 52, the thickness dimension of the constricted portion 46 which is thinner than the annular fixing portion 36 is set stably. Therefore, the problem that the constricted portion 46 is strongly sandwiched between the locking convex portion 24 and the annular convex portion 60 and is broken or the durability is lowered is avoided, and the stability and improvement of the quality are achieved. It is done.

  Further, the distance between the facing surfaces of the opening end surface 32 of the housing 12 and the outer peripheral fixing portion 56 of the ring member 52 is different between the inner peripheral side and the outer peripheral side of the welding convex portion 62. In particular, the facing area of the opening end surface 32 and the outer peripheral fixing portion 56 is increased on the outer peripheral side where the distance between the opposing surfaces is larger than that on the inner peripheral side. Thereby, when the housing 12 and the ring member 52 are welded, the opening end surface 32 and the outer peripheral fixing portion 56 (contact surface 64) directly contact each other on the inner peripheral surface or between the inner peripheral surfaces. The position of the housing 12 and the ring member 52 in the approaching direction is defined by the abutment of the opening end surface 32 and the outer peripheral fixing portion 56 indirectly through the molten resin that has been filled. In the unlikely event that the melting step and the valve body fixing step are further continued, the opposing surface of the opening end surface 32 and the outer peripheral fixing portion 56 withdrawn on the outer peripheral side directly or indirectly abuts on a larger area, so that the housing The relative position in the approach direction between the ring member 12 and the ring member 52 can be reliably defined, and excessive approach can be prevented.

  In addition, the housing 12 and the ring member 52 are firmly fixed by being melted and integrally connected and fixed at the welded portion 66, so that the elastic valve body 14 is substantially inseparable. 12 and the ring member 52 are stably supported.

  Furthermore, the welding part 66 is provided continuously over the entire circumference in the circumferential direction of the housing 12 and the ring member 52, and the housing 12 and the ring member 52 are fixed to each other over the entire circumference. A large welding area is secured between the housing 12 and the ring member 52 and the housing 12 and the ring member 52 are firmly fixed.

  In addition, a positioning portion 68 is provided on the inner peripheral side of the welded portion 66 in an annular shape over the entire circumference, and the positioning action is achieved by the housing 12 and the ring member 52 continuously contacting over the entire circumference. It has come to be demonstrated. Therefore, the housing 12 and the ring member 52 can be prevented from being fixed in a relatively inclined state, and the elastic valve body 14 can be stably held between the housing 12 and the ring member 52.

  Further, the fitting convex portion 58 provided on the inner peripheral clamping portion 54 of the ring member 52 is inserted into the housing 12, and the outer peripheral surface of the fitting convex portion 58 substantially contacts the inner peripheral surface of the housing 12. It is piled up in the state which did. Thereby, the ring member 52 is positioned in the radial direction with respect to the housing 12, the ring member 52 is attached to an appropriate position with respect to the housing 12, and the molten resin of the welding convex portion 62 is on the inner peripheral side of the housing 12. The elastic valve body 14 is protected from heat during welding. In addition, since the molten resin enters between the overlapping surfaces of the fitting convex portion 58 and the inner peripheral surface of the opening portion 20 of the housing 12, stronger fixation between the housing 12 and the ring member 52 can be expected.

  Further, as shown in FIG. 3, the outer peripheral wall of the opening 20 that accommodates the annular fixing portion 36 of the elastic valve body 14 in the housing 12 is made higher than the annular fixing portion 36. The entire outer peripheral surface of the annular fixing portion 36 is covered with the outer peripheral wall of the opening 20 of the housing 12. And the welding site | part with the ring member 52 in the front end surface (opening end surface) 32 of the outer peripheral wall of the opening part 20 of the housing 12 is set in the position away from the cyclic | annular fixing | fixed part 36 of the elastic valve body 14 upwards.

  Thereby, when the housing 12 and the ring member 52 are welded, even if the molten resin protrudes from the overlapping surface of the opening end surface 32 of the housing 12 and the welding projection 62 of the ring member 52 to the inner peripheral side, the molten resin However, it is difficult to cause a situation in which the outer peripheral surface of the annular fixing portion 36 of the elastic valve body 14 is directly pressed. Further, the guide portion (fitting convex portion 58) provided on the ring member 52 eliminates a situation in which the molten resin directly presses the outer peripheral surface of the annular fixing portion 36 of the elastic valve body 14 and the like. For this reason, the holding state of the elastic valve body 14 is stably maintained, and the molten resin does not adversely affect the durability of the elastic valve body 14. In particular, in this embodiment, between the welded portion of the housing 12 and the ring member 52 and the annular fixing portion 36 of the elastic valve body 14, the fitting protrusion 58 of the ring member 52 and the entire opening 20 of the housing 12 are all. Since the fitting part over the circumference is provided, the contact of the molten resin with the elastic valve body 14 is more effectively prevented.

  Further, since the annular convex portion 60 protruding from the ring member 52 is inserted into the outer annular concave groove 44 of the elastic valve body 14, the ring convex portion 58 of the ring member 52 is inserted into the housing 12 before being inserted into the housing 12. The member 52 is temporarily positioned with respect to the housing 12 in the direction perpendicular to the axis. Therefore, it is easy to fit the hard fitting convex portion 58 into the hard housing 12, and the housing 12 and the ring member 52 can be easily positioned in the direction perpendicular to the axis.

  In addition, in a state where the housing 12 and the ring member 52 are fixed, the locking projection 24 of the housing 12 is fitted and locked in the inner annular groove 42 and the ring member 52 is locked in the outer annular groove 44. The annular projection 60 is fitted and locked. As a result, when the annular fixing portion 36 of the elastic valve body 14 is sandwiched between the valve seat 22 of the housing 12 and the fitting convex portion 58 of the ring member 52, the annular fixing portion 36 faces the inner peripheral side. The bulging deformation is limited by the locking projection 24 and the annular projection 60. Accordingly, the annular fixing portion 36 is pressed against the inner peripheral surface of the opening 20 in the housing 12 and the inner surface of the fitting concave groove 26 and the front end surface of the fitting convex portion 58 of the ring member 52, and the annular fixing portion. The overlapping surface of 36, the housing 12, and the ring member 52 is sealed.

  The medical connector 10 is used, for example, as a mixed injection port of a three-way stopcock 72 as shown in FIGS. The three-way cock 72 has a structure in which a cock 76 is attached to a holder 74.

  More specifically, the holder 74 has a hollow structure provided with a main body 78 having a substantially cylindrical shape and first to third three branch pipes 80, 82, 84 protruding from the outer periphery of the main body 78. It is a molded product. These first to third branch pipes 80, 82, 84 have one end in the axial direction connected to the main body 78 and communicated with the internal space of the main body 78, and the other end is shown in FIG. As indicated by a broken line in FIG. 19, the first to third branch openings 86, 88, and 90 communicate with the external space. Thereby, the internal flow paths connected to the first to third branch openings 86, 88, 90 are formed by the internal spaces of the first to third branch pipes 80, 82, 84, respectively. Further, the first branch pipe 80 and the second branch pipe 82 are formed at opposing positions on the outer periphery of the main body 78 and are arranged on substantially the same axis. On the other hand, the third branch pipe 84 is formed on the outer periphery of the main body portion 78 at a position that forms an angle of approximately 90 degrees with respect to the first branch pipe 80 and the second branch pipe 82.

  In the three-way stopcock 72 shown in FIGS. 18 and 19, a female luer cap 92 having an internal thread formed on the inner peripheral surface is detachably fixed to the first branch opening 86 in an externally inserted state. ing. In addition, a lock adapter 94 having an internal thread formed on the inner peripheral surface of the second branch pipe 82 is engaged with a flange-like portion (not shown) formed on the second branch pipe 82 so as not to be pulled out and is extrapolated. It is installed in a state. Furthermore, a male luer cap 96 is detachably attached to the second branch opening 88 in an extrapolated state.

  A cock 76 is inserted into the main body 78 and is pivotably and liquid-tightly assembled. By rotating this cock 76, each interior formed by the internal space of the first to third branch pipes 80, 82, 84 and opened at the first to third branch openings 86, 88, 90 is provided. The flow path can be selectively communicated.

  The three-way cock 72 is configured by connecting the medical connector 10 to the branch opening 90 of the third branch pipe 84 of the holder 74. In the three-way stopcock 72 having such a structure, generally, the first branch opening 86 is connected to the tube on the upstream side of the infusion route, and the second branch opening 88 is connected to the tube on the downstream side. Thus, the first branch pipe 80 and the second branch pipe 82 constitute a part of the infusion route and are disposed on the infusion route.

  Then, as shown in FIG. 20, for example, a luer lock connector 102 as a male connector is connected to the medical connector 10. 20A shows a state before the luer lock connector 102 is connected, and FIG. 20B shows a connection state of the luer lock connector 102. The luer lock connector 102 is a conventionally known lure lock connector having a standard size defined in, for example, ISO 594. The luer tip 104 has a tapered cylindrical taper shape to form an external flow path, and the outer periphery of the luer tip 104. Is provided with a female thread portion 106 surrounding the.

  When the luer tip 104 of the luer lock connector 102 is pressed against the outer surface 40 of the elastic valve body 14 of the medical connector 10, the elastic valve body 14 is elastically deformed, and as shown in FIG. The luer tip 104 is inserted into the opened slit 50. As a result, the internal space such as a syringe connected to the luer tip 104 is communicated with the internal channel of the third branch pipe 84 through the fluid channel in the luer tip 104. At the same time, the threaded portion 106 of the luer lock connector 102 is screwed into the male threaded portion 30 of the medical connector 10, so that the insertion state of the luer tip 104 is reliably maintained.

  In such a state that the luer tip 104 is inserted, the cock 76 is operated to bring the third branch pipe 84 and the second branch pipe 82 into a communication state, whereby the liquid medicine filled in the syringe is mixedly injected onto the infusion route. It becomes possible. Then, after the mixed injection is completed and the luer tip 104 is removed, the central portion 34 is restored to the disk shape by the elastic restoring force of the elastic valve body 14, and the slit 50 is closed substantially airtightly. .

  20 illustrates a luer lock type connector having a female thread portion 106 as a male connector. However, a so-called luer slip type connector that does not have the female thread portion 106 and includes only the luer tip 104 is also connected. Is possible. When only the luer slip type is targeted as the male connector, the stepped shape of the housing 12 and the male screw portion 30 are not necessarily required.

  As mentioned above, although embodiment of this invention was explained in full detail, this invention is not limited by the specific description. For example, the welding convex portion may be provided so as to protrude from the opening end surface of the housing toward the ring member. Furthermore, it is also possible to form welding convex portions on the housing and the ring member so as to protrude from both the overlapping surfaces of the housing and the ring member.

  Further, when the welding convex portion is partially formed in the radial direction on the overlapping surface of the housing and the ring member as in the above-described embodiment, the welding convex portion is provided in the radial intermediate portion of the overlapping surface. Although it is desirable, for example, it can be provided at the inner peripheral end or the outer peripheral end of the overlapping surface. Furthermore, a plurality of welding projections may be arranged away from each other in the radial direction.

  Further, when a welded portion is provided at the radial intermediate portion of the overlapping surface of the housing and the ring member, as shown in the above embodiment, either the inner peripheral side or the outer peripheral side outside the welded portion is used. Positioning portions may be provided only on one of them, or by providing positioning portions on both the inner peripheral side and the outer peripheral side, it is possible to obtain a higher positioning action by contact.

  Furthermore, when the welding portion is provided in the intermediate portion in the radial direction of the overlapping surface and the positioning portion is provided at a position deviated in the radial direction, the positioning portion is preferably provided adjacent to the welding portion. Further, the welded portion and the positioning portion can be spaced apart from each other in the radial direction by providing a groove for preventing the molten resin from protruding along the welded convex portion.

  Further, the welding convex portion is not limited to an annular shape that is continuous over the entire circumference in the circumferential direction on the overlapping surface of the housing and the ring member. For example, a plurality of welding convex portions each having a protruding shape are provided in the circumferential direction. And may be provided intermittently apart from each other.

  Furthermore, when the welding convex part is partially formed on the circumference on the overlapping surface of the housing and the ring member, the welding convex part may be provided continuously over the entire radial direction of the overlapping surface. good. In this case, the housing and the ring member abut on each other in the axial direction between the circumferential directions of the plurality of welding projections, and the housing and the ring member are positioned relative to each other in the axial direction.

  Further, in the above-described embodiment, the fitting convex portion 58 and the annular convex portion 60 provided on the inner peripheral clamping portion 54 of the ring member 52 are not essential. That is, the shape of the lower surface of the inner peripheral clamping portion in the ring member can be changed as appropriate depending on the shape of the elastic valve body, and for example, the inner peripheral clamping portion of the ring member having a flat lower surface is also employed. obtain. Moreover, although it is desirable that the fitting convex part is continuous over the entire circumference, the fitting convex part is not necessarily provided continuously over the entire circumference as long as it is configured to be inserted into the opening of the housing. There is no need. Specifically, the fitting convex portion may have a structure divided into a plurality in the circumferential direction.

  Moreover, in the said embodiment, although the example which uses the medical connector 10 which concerns on this invention as a mixed injection port of a three-way cock was shown, as shown to Fig.21 (a), (b), (c), for example. Of course, the present invention can be applied to the medical connector constituting the mixed injection plug 108, the mixed injection tube 112, the drug bag 118, and the like.

  More specifically, in the mixed injection plug 108 shown in FIG. 21A, one opening of the cylindrical plug body 110 is liquid-tightly attached to the housing 12 of the medical connector 10 of the embodiment. The medical connector 10 and the plug main body 110 constitute a mixed injection plug 108. Further, in the mixed injection tube 112 shown in FIG. 21 (b), a cylindrical attachment portion 116 is provided to open upward with respect to the long infusion tube body 114, and the opening portion of the attachment portion 116 is provided. On the other hand, the housing 12 of the medical connector 10 of the embodiment is attached in a liquid-tight manner. The medical connector 10, the infusion tube 114 and the attachment portion 116 constitute a mixed injection tube 112. Furthermore, in the medicine bag 118 shown in FIG. 21 (c), the housing 12 of the medical connector 10 extends into a cylindrical shape, so that the medicine bag 118 is connected to the bag body 120 in which various kinds of drug solutions, physiological saline, and the like are enclosed. ing. The bag body 120 is made of a synthetic resin sheet material on which aluminum is vapor-deposited. The peripheral portion of the opening is closed by welding or the like, and is sealed integrally with the medical connector 10, whereby the medical connector 10. And the bag body 120 are connected in a liquid-tight manner. The medical connector 10 and the bag body 120 constitute a drug bag 118.

  In the above-described embodiment, the ring member 52 is overlapped on the opening end surface 32 of the housing 12 so that the overlapping surface of the housing 12 and the ring member 52 is welded. The overlapping surface of the member 52 is not necessarily limited to the opening end surface 32 of the housing 12. That is, the outer peripheral portion of the ring member has a cylindrical shape extending toward the opening 20 of the housing 12, and the cylindrical portion is extrapolated to the opening 20 of the housing 12 and provided at the lower end of the cylindrical portion. The flange portion is overlapped with the housing 12, and the welding convex portion 62 provided between the overlapping surfaces of the flange portion and the housing 12 is melted, so that the lower end of the cylindrical portion of the ring member is welded to the housing 12. You may make it.

  Further, for example, the valve body setting step is a step of setting the elastic valve body 14 to the ring member 52 by inserting the annular convex portion 60 of the ring member 52 into the outer annular groove 44 of the elastic valve body 14. You can also In this case, for example, the melting step is a step of superimposing the lower surface of the ring member 52 on which the elastic valve body 14 is set on the opening end surface 32 of the housing 12 to melt the welding convex portion 62 of the ring member 52. The

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

DESCRIPTION OF SYMBOLS 10: Medical connector, 12: Housing, 14: Elastic valve body, 20: Opening part, 22: Valve seat, 24: Locking convex part (annular convex part), 32: Opening end surface, 42: Inner annular concave groove (Annular groove), 44: outer annular groove (annular groove), 52: ring member, 58: fitting convex part, 60: annular convex part, 62: welding convex part, 64: contact surface, 66: Welding part, 68: Positioning part

Claims (8)

A housing preparation step of preparing a housing made of a thermoplastic resin having an opening in which a valve seat for supporting an outer peripheral portion of a disc-shaped elastic valve body is formed;
A ring member made of a thermoplastic resin that is attached to the opening of the housing and sandwiches an outer peripheral portion of the elastic valve body with the valve seat, and is fitted into the opening of the housing A ring member preparation step for preparing a joint having a convex portion ;
A valve body setting step of setting the elastic valve body in the opening by supporting the elastic valve body in the valve seat of the housing;
The ring projection is overlapped on the housing on which the elastic valve body is set, and the welding projection is provided on the outer peripheral side of the fitting projection on the ring member and projecting on the overlapping surface of the housing and the ring member. A melting step for melting
Under the molten state of the welding projection in the melting step, the housing and the ring member are pressed in the approaching direction until the welding projection is crushed and the contact area of the overlapping surface of the housing and the ring member increases. to by fixing integrally connected at their housing and the ring member the solution alignment projection,該Ha maggots ring of the valve seat and the valve body fixing step of the outer peripheral portion is sandwiched in the elastic valve body with said ring member And a method for manufacturing a medical connector.   In the overlapping surface of the housing and the ring member, the welding convex portion having a uniform length from the overlapping surface to the tip is provided continuously or intermittently in the circumferential direction. The manufacturing method of the medical connector of Claim 1. As the elastic valve body, while adopting a structure provided with annular concave grooves that open in the inner and outer surfaces of the outer peripheral portion and extend in the circumferential direction,
As the housing, adopting the structure of the valve seat provided with an annular convex portion inserted into the annular concave groove provided on the inner surface of the elastic valve body,
As the ring member, adopting a structure provided with an annular convex portion inserted into the annular concave groove provided on the outer surface of the elastic valve body,
In the valve body setting step, the annular convex portion of the valve seat of the housing is inserted into the annular concave groove on the inner surface of the elastic valve body and set, and in the melting step and the valve body fixing step The annular projections are inserted into the annular grooves on the inner and outer surfaces of the elastic valve body by inserting the annular projections of the ring member into the annular grooves on the outer surface of the elastic valve body. The manufacturing method of the medical connector of Claim 1 or 2 which pushes and fits.   The medical use according to any one of claims 1 to 3, wherein, in the melting step, ultrasonic contact is applied to the contact portion of the welding convex portion on the overlapping surface of the housing and the ring member to melt. A method for manufacturing a connector. A medical connector in which a disc-shaped elastic valve body is assembled to an opening of a housing, and an outer peripheral portion of the elastic valve body is supported by the housing,
A valve seat for supporting the inner surface of the outer peripheral portion of the elastic valve body is formed at the opening of the housing, and the outer surface of the outer peripheral portion of the elastic valve body is inserted into the opening of the housing. The ring member having the fitting convex portion is overlapped , and the housing and the ring member are directly fixed around the elastic valve body on the outer peripheral side of the fitting convex portion of the ring member. An outer peripheral portion of the elastic valve body is sandwiched between the valve seat and the ring member,
In the fixing portion between the housing and the ring member, a welding convex portion provided between the overlapping surfaces of the housing and the ring member is melted to provide a welding portion, and the bonding portion between the overlapping surfaces is provided. A medical connector comprising a positioning portion for positioning the housing and the ring member in an approaching direction by contacting portions of the welding convex portion with each other and contacting each other. The ring member engages with the housing, and the welding convex portion melts after the housing and the ring member are overlapped with each other, and the portions where the welding convex portion is removed between the overlapping surfaces contact each other. The medical connector according to claim 5 , wherein a guide portion that guides movement of the housing up to is formed. Together with the welded portion is formed continuously along the entire circumference in the circumferential direction of the housing, according to claim 5 or 6 wherein the positioning portion at a position out of solution attaching portion in a radial direction are provided Medical connector. A housing preparation step of preparing a housing made of a thermoplastic resin having an opening in which a valve seat for supporting an outer peripheral portion of a disc-shaped elastic valve body is formed;
A ring member made of a thermoplastic resin that is attached to the opening of the housing and sandwiches an outer peripheral portion of the elastic valve body with the valve seat, and is fitted into the opening of the housing A ring member preparation step for preparing a joint having a convex portion ;
A valve body setting step for setting the elastic valve body on the ring member;
The welding convex part which protruded on the overlapping surface of the housing and the ring member on the outer peripheral side of the fitting convex part in the ring member by superimposing the housing on the ring member on which the elastic valve body is set A melting step for melting
Under the molten state of the welding projection in the melting step, the housing and the ring member are pressed in the approaching direction until the welding projection is crushed and the contact area of the overlapping surface of the housing and the ring member increases. to by fixing integrally connected at their housing and the ring member the solution alignment projection,該Ha maggots ring of the valve seat and the valve body fixing step of the outer peripheral portion is sandwiched in the elastic valve body with said ring member And a method for manufacturing a medical connector.

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