JP2023071573A - Medical connection device - Google Patents

Abstract

To provide a medical connection device for rotatably coupling, a connector main body having a male type lure part and an attachment.SOLUTION: A medical connection device 1 comprises: a connector main body 10; a screwing cylinder 20 which is integrally provided on the connector main body 10 or is rotatably coupled to the connector main body; and an attachment 30 which is rotatably coupled to the connector main body 10. The connector main body 10 has a male type lure part 11 on one end side, and an insertion part 12 (first coupling part) on the other end side. The attachment 30 has a reception cylinder part 31 (second coupling part) on one end side, and a tube holder part 32 (connection part) on the other end side. On a periphery of the insertion part 12, a toric first engagement protrusion 15 is formed, on an inner periphery of the reception cylinder part 31, a plurality of second engagement protrusions 35 which is arranged at an interval in a circumferential direction is formed. By engagement of the engagement protrusions 15, 35, the connector main body 10 and the attachment 30 are coupled rotatably, and axial movement where they are separated each other is restricted.SELECTED DRAWING: Figure 3

Description

The present invention relates to medical connecting devices for connecting medical components such as tubes.

An example of a conventional connection system for connecting tubes or the like is shown in FIGS. 13 and 14 of Patent Document 1. FIG. This connection system comprises a male connector (medical connecting device) and a female connector. The male connector has a connector body and a threaded tube rotatably connected to the connector body. The connector body integrally has a male luer portion on one end side and a tube holder portion on the other end side. A tube is connected to this tube holder portion. The threaded tube has a threaded portion positioned radially outwardly of the male luer portion of the connector body, and a female thread is formed on the inner circumference of the threaded portion. On the other hand, the female connector has a female luer portion on one end side and a tube holder portion to which a tube is connected on the other end side. A protrusion to be screwed into the female thread is formed on the outer circumference of the distal end of the female luer portion.

When the screw tube is rotated in the tightening direction while the female thread of the screw tube and the projection of the female connector are screwed together, the male luer portion and the female luer portion are joined. Further, when the threaded tube is turned in the tightening direction, the male luer portion and the female luer portion are strongly joined with a pressing force, and sealing performance is obtained.

In the connection system of Patent Literature 1 described above, the two tube holders do not rotate relative to each other, so the tubes connected to these tube holders may be twisted.

A male connector (medical connecting device) shown in FIG. 18 of Patent Document 2 includes a connector body having a male luer portion and an attachment rotatably connected to the opposite side of the male luer portion in the connector body. and have. This attachment integrally has a tube holder portion. According to this configuration, since the tube holder portion of the male connector and the tube holder portion of the female connector can rotate relative to each other, twisting of the tube connected to both tube holder portions can be avoided.

A connection structure between the connector main body and the attachment will be briefly described. The connector body has a receiving sleeve at its end. The attachment has an insertion portion with an annular protrusion formed on its outer circumference. The connection between the connector body and the attachment is completed by inserting the inserting portion of the attachment into the receiving cylindrical portion of the connector body and attaching the ring-shaped pressing member to the tip edge of the connector body. Separation of the attachment from the connector body is prohibited because the annular protrusion of the attachment is locked by the pressing member of the connector body.

Incidentally, Patent Documents 1 and 2 also disclose an operating cylinder that is externally attached to the screwed cylinder, and a torque limit mechanism arranged between the screwed cylinder and the operating cylinder.

International publication WO2020/071024 (Fig. 13, Fig. 14) International publication WO2016/157974 (Fig. 18)

In the male connector of Patent Document 2, after the inserting portion of the attachment is inserted into the tubular receiving portion of the connector body, the pressing member must be fixed to the tip edge of the tubular receiving portion by adhesion or welding. Since it is required separately, the number of parts increases, and the operation of bonding or welding the pressing member to the receiving cylinder is complicated.

The present invention has been made to solve the above problems. a connector body having a flow path extending through a first connecting portion; (c) the first connecting portion of the connector body; an attachment having at one end a second connecting portion rotatably connected to and having at the other end a connecting portion to which a medical component is connected,
One connecting portion of the first connecting portion and the second connecting portion is configured as a tubular receiving portion, and the other connecting portion is configured as an insertion portion to be inserted into the tubular receiving portion. is formed with a first engaging projection, and a second engaging projection is formed on the inner circumference of the receiving tubular portion, and when the inserting portion is inserted into the receiving tubular portion, the receiving tubular portion and/or The second engaging projection can get over the first engaging projection with elastic deformation of the insertion portion, and the engagement between the first engaging projection and the second engaging projection allows the connector to Axial movement of the main body and the attachment away from each other is prohibited and they are rotatably connected.

According to the above configuration, although the connector main body and the attachment are rotatably connected, they can be easily connected without requiring additional components.

Preferably, the first engaging projection has an annular shape, a plurality of the second engaging projections are arranged spaced apart in the circumferential direction, and the receiving cylindrical portion has an inner side of the second engaging projection. A hole having a peripheral length equal to or longer than the peripheral length of the second engaging projection is formed adjacently through the hole in the radial direction.
According to this configuration, even if the second engaging projection is an undercut portion, the connector main body or the attachment having the receiving tube portion can be relatively easily injection-molded.

Preferably, the threaded tube is rotatably connected to the connector body and has a restricting tube portion extending in a direction opposite to the threaded portion. Regulates elastic deformation that accompanies expansion of the diameter of the part.
According to this configuration, since the elastic deformation of the receiving tube portion is restricted by the restricting tube portion of the screwing tube, even when a strong tensile force acts between the connector main body and the attachment, the first and second engaging projections are prevented from moving. engagement can be reliably maintained.

Preferably, it further comprises an operating cylinder that is externally attached to the screwing cylinder, and a torque limit mechanism arranged between the operating cylinder and the screwing cylinder, wherein the torque limit mechanism tightens the operation cylinder. directional rotational torque is transmitted to the screwed cylinder, and when the rotational torque exceeds a set torque, the operation cylinder is idly rotated with respect to the screwed cylinder, and the operation cylinder is adapted to rotate the receiving cylinder. It has a restricting cylinder part that covers the cylinder part and restricts the elastic deformation that accompanies the diameter expansion of the receiving cylinder part.
According to this structure, since the elastic deformation of the receiving tube portion is restricted by the restricting tube portion of the operating tube, even when a strong tensile force acts between the connector main body and the attachment, the first and second engaging projections are prevented from moving. Engagement can be reliably maintained.

In one aspect, the connecting portion of the attachment is a tube holder portion.
In another aspect, the connection portion of the attachment is a female luer portion.
In yet another aspect, the medical component is integrally connected to the connection portion of the attachment.

ADVANTAGE OF THE INVENTION According to this invention, a connector main body and an attachment can be rotatably connected by a simple work with a minimum number of parts.

1 is an exploded longitudinal sectional view showing a medical connection device according to a first embodiment of the present invention; FIG. 1B is a cross-sectional view of the attachment taken along line BB of FIG. 1A; FIG. It is a front view of the attachment seen from the C direction of FIG. 1A. It is a longitudinal cross-sectional view which shows the assembly completion state of the connecting device for medical use. FIG. 2B is a cross-sectional view taken along line BB of FIG. 2A; Fig. 3 is a vertical cross-sectional view showing a state in which a female connector is connected to the same medical connecting device; Fig. 10 is a vertical cross-sectional view showing a medical connecting device according to a second embodiment of the present invention together with a female connector and a male connector; FIG. 10 is a vertical cross-sectional view of a medical connection device in which female connectors and male connectors are connected to both sides in the second embodiment. FIG. 11 is an exploded perspective view of a connecting device for medical use according to a third embodiment of the present invention; It is a longitudinal cross-sectional view showing a screwing tube and an operation tube of the same medical connecting device. FIG. 7B is a top view of the threaded tube viewed from the direction B in FIG. 7A; FIG. 7B is a front view of the threaded tube viewed from direction C in FIG. 7A. FIG. 7B is a front view of the operation barrel when the same operation barrel is viewed from direction D in FIG. 7A; Fig. 2 is a longitudinal sectional view showing a first sub-assembly consisting of a connector main body and an attachment, and a second sub-assembly consisting of a screwing cylinder and an operation cylinder in the same medical connecting device; Fig. 2 is a vertical cross-sectional view of a medical connecting device completed by assembling the first and second subassemblies; FIG. 9B is a cross-sectional view taken along line BB of FIG. 9A; FIG. 10 is a vertical cross-sectional view showing a medical connecting device according to a fourth embodiment of the present invention together with a female connector and a male connector; FIG. 11 is a vertical cross-sectional view of a medical connection device according to a fifth embodiment of the present invention; FIG. 11 is a vertical cross-sectional view of a medical connection device according to a sixth embodiment of the present invention;

A medical connection device according to a first embodiment of the present invention will be described below with reference to FIGS. 1 to 3. FIG. As shown in FIG. 3, the medical connection device 1 of this embodiment has a function as a male connector, and cooperates with a female connector 100 to provide tubes 5, 5' ( medical components). Each component of the medical connecting device 1 and the female connector 100 are made of injection molded resin.

<Each component of the medical connection device 1>
As shown in FIG. 1A, the medical connection device 1 includes a connector main body 10, a threaded tube 20 provided integrally with the connector main body 10, and an attachment 30 separate from the connector main body 10. there is

The connector body 10 has a male luer portion 11 at one end in the axial direction and an insertion portion 12 (first connecting portion) at the other end. Further, the connector body 10 has a flow path 13 that extends axially through the connector body 10 through the male luer portion 11 and the insertion portion 12 . The outer surface of the male luer portion 11 is gently tapered such that the diameter decreases toward the tip. An annular engaging projection 15 (first engaging projection) is formed on the outer periphery of the insertion portion 12 . The engaging projection 15 has a steep engaging surface 15a perpendicular to the axis facing the male luer portion 11 and an inclined guide surface 15b facing away from the male luer portion 11. As shown in FIG.

One end of the threaded tube 20 is integrally connected to the outer periphery of the axially intermediate portion of the connector body 10 (a portion between the male luer portion 11 and the insertion portion 12), and has a threaded portion 21. ing. The threaded portion 21 is coaxial with the male luer portion 11 and disposed radially outward of the male luer portion 11, and has a female thread 21a formed on its inner periphery.

The attachment 30 includes a large-diameter receiving tubular portion 31 (second connecting portion) on one axial end, a small-diameter tubular tube holder portion 32 (connecting portion) on the other end, and a partition wall formed therebetween. 33. An end portion of the tube 5 is inserted and fixed to the tube holder portion 32 . A hole 33 a is formed in the center of the partition wall 33 . Three (plurality) engaging projections 35 (second engaging projections) are formed on the inner circumference of the tip end edge of the cylindrical receiving portion 31 , which are spaced apart in the circumferential direction. The engaging projection 35 has a steep engaging surface 35a orthogonal to the axis on the far side (the side opposite to the tube holder portion 32) and an inclined guide surface 35b on the distal side (the side opposite to the tube holder portion 32). ing.

The engaging projection 35 protrudes radially inward from the cylindrical receiving portion 31 and becomes an undercut portion during injection molding. More specifically, in the mold for injection molding the attachment 30, the mold for molding the outer peripheral surface of the attachment 30 has three (plurality) moving molding pieces that are radially protruding and retractable and are spaced apart in the circumferential direction. are arranged as follows. Injection molding is performed with these moving molding pieces projecting from the mold surface, and the engaging surfaces 35a of the engaging protrusions 35 are formed by these moving molding pieces. After the molding, the movable molding pieces are retracted, and as a result, holes 36 adjacent to the engaging projections 35 are formed in the cylindrical receiving portion 31 . This hole 36 has the same circumferential position and circumferential length as the engaging projection 35 . In addition, in the moving molding piece, if the width of the other portion of the engaging protrusion 35 for forming the engaging surface 35 a is wider than the width of the other portion, the peripheral length of the hole 36 is larger than the peripheral length of the engaging protrusion 35 . become longer.

<Assembly of medical connection device>
The insertion portion 12 of the connector main body 10 and the receiving cylindrical portion 31 of the attachment 30 are connected by so-called snap fitting so that they can rotate relative to each other. More specifically, as shown in FIG. 1A, the connector main body 10 and the attachment 30 are coaxially arranged with the insertion portion 12 and the cylindrical receiving portion 31 facing each other, and brought close to each other. Then, the insertion portion 12 enters the receiving tube portion 31, and the guide surface 35b of the engagement projection 35 of the attachment 30 and the guide surface 15b of the engagement projection 15 of the insertion portion 12 come into contact. When the two are brought closer together, mainly the cylindrical receiving portion 31 is elastically deformed and expanded in diameter, and when the engaging projection 35 gets over the engaging projection 15, it is elastically restored. The snap fit is thus completed and the medical connecting device 1 is assembled as shown in FIG. 2A. During this assembly, a seal ring 40 is interposed between the small-diameter distal end portion of the insertion portion 12 of the connector body 10 and the deep end portion of the receiving tubular portion 31 of the attachment 30 .

In the present embodiment, when the engaging projection 35 rides over the engaging projection 15, the receiving cylindrical portion 31 is mainly elastically deformed. , the insertion portion 12 may be elastically deformed so as to reduce its diameter, or the insertion portion 12 and the tubular receiving portion 31 may be elastically deformed to substantially the same extent.

As described above, the connector main body 10 and the attachment 30 can be easily rotatably connected simply by bringing them close to each other. Moreover, no separate parts for connection are required. Even if an axial pulling force acts between the connector main body 10 and the attachment 30, the engaging surfaces 15a, 35a of the engaging projections 15, 35 are engaged to prevent the connector main body 10 and the attachment 30 from separating. can do.

<Connection between medical connection device and female connector>
As shown in FIG. 3, the female connector 100 has an elongated cylindrical shape, and has a female luer portion 101 at one end in the axial direction and a tube holder portion 102 at the other end. The inner surface of the female luer portion 101 is gently tapered such that the diameter increases toward the tip. The taper angle of the inner surface of the female luer portion 101 is substantially equal to the taper angle of the outer surface of the male luer portion 11 . A pair of protrusions 103 serving as male threads are formed on the outer circumference of the distal end of the female luer part 101 at a distance of 180° in the circumferential direction. An end portion of the tube 5' is inserted and fixed to the tube holder portion 102. As shown in FIG.

The medical connecting device 1 and the female connector 100 are brought close to each other, and the male luer portion 11 is inserted into the female luer portion 101 . When the protrusion 103 of the female connector 100 hits the female thread 21a of the threaded tube 20 of the medical connecting device 1, the threaded tube 20 is turned in the tightening direction. As a result, male luer portion 11 is press-fitted into female luer portion 101, and male luer portion 11 and female luer portion 101 are joined with sufficient sealing performance. In this embodiment, since the threaded tube 20 and the connector main body 10 are integrated, the male luer portion 11 is press-fitted into the female luer portion 101 while rotating. Since the connector main body 10 and the attachment 30 are rotatable, the tube 5 is not twisted even when the threaded cylinder 20 is turned.

In the connected state of the medical connecting device 1 and the female connector 100, the tubes 5, 5' are connected to the hole 33a of the partition wall 33 of the attachment 30, the flow path 13 of the medical connecting device 1, and the flow path of the female connector 100. They are connected via channels, allowing the flow of medical fluids and blood. In this connected state, the connector body 10 and the attachment 30 of the medical connecting device 1 are relatively rotatable, and thus the tube holder portions 32 and 102 are relatively rotatable, so that the orientation and arrangement of the tubes 5 and 5' can be changed. However, it is possible to suppress the occurrence of torsion.

Other embodiments of the present invention will be described below. In these embodiments, the same or similar numbers are assigned to components corresponding to the preceding embodiments, and detailed descriptions thereof are omitted.
<Second embodiment>
In the medical connecting device 1A of the second embodiment shown in FIGS. 4 and 5, the connector main body 10A and the threaded tube 20A are separate bodies. The connector main body 10A has an annular engagement projection 16 as a support portion between the male luer portion 11 and the insertion portion 12 . The engaging protrusion 16 has a guide surface inclined toward the male luer portion 11 side and a steep engaging surface toward the insertion portion 12 side. 20 A of threaded cylinders have the threaded part 21, the mounting part 22, and the cylindrical regulation cylinder part 23 in order toward the other end side from one end side.

An annular engaging projection 24 is formed on the inner periphery of the mounting portion 22 . The engaging protrusion 24 has a guide surface inclined toward the restricting cylinder portion 23 side and a steep engaging surface toward the screwing portion 21 side. By arranging the threaded tube 20A coaxially with the connector main body 10A and bringing the threaded tube 20A close to it, the engaging protrusion 24 and the engaging protrusion 16 are engaged (snap-fitted), thereby allowing the threaded tube 20A to rotate with the connector main body 10A. connected to

An engaging projection 15 is formed on the outer periphery of the insertion portion 12 of the connector main body 10A in the same manner as in the first embodiment. An annular groove is formed in the outer periphery of the distal end portion of the insertion portion 12, and a seal ring 40 is accommodated in this annular groove.

The attachment 30A has a receiving tubular portion 31 and a female luer portion 37 (connecting portion) coaxially. A pair of protrusions 38 serving as male threads are formed on the outer circumference of the distal end of the female luer portion 37 . The female luer portion 37 and projection 38 have the same shape as the female connector 100 described above. A plurality of engaging projections 35 and holes 36 are formed in the receiving tube portion 31 as in the first embodiment.

<Assembly of Medical Connection Device of Second Embodiment>
First, the connector main body 10A and the attachment 30A are rotatably connected by engaging (snap-fitting) the engaging protrusions 15 and 35 in the same manner as in the first embodiment, and then the threaded tube 20A is connected to the connector main body 10A as described above. Rotational coupling by snap fitting completes the assembly of the medical connecting device 1A. In this assembled state, the regulating cylinder portion 23 of the threaded cylinder 20A is in contact with the outer circumference of the receiving cylinder portion 31 of the attachment 30A or with a slight gap therebetween. part) is covered all around.

<Tube connection>
On one side of the medical connecting device 1A, as in the first embodiment, the female luer portion 101 of the female connector 100 is joined to the male luer portion 11 by turning the threaded tube 20A. The tube 5' is connected to the medical connecting device 1A.

A tube 5 is connected via a male connector 200 to the other side of the medical connection device 1A. The male connector 200 has a connector main body 210 and a threaded tube 220 rotatably attached to the connector main body 210, like the medical connecting device 1A. The connector main body 210 has a male luer portion 211 on one end side, a tube holder portion 212 on the other end side, and a support portion 213 on an intermediate portion. The threaded cylinder 220 has a threaded portion 221 formed with a female thread 221a on one end side, and a mounting portion 222 on the other end side. The threaded tube 220 is rotatably attached to the connector body 210 by snap-fitting the mounting portion 222 of the threaded tube 220 to the support portion 213 of the connector body 210 . A tube 5 is inserted and fixed to the tube holder portion 212 .

The male connector 200 was placed coaxially with the medical connecting device 1A and brought close to it, and the female thread 221a of the screw cylinder 220 of the male connector 200 was screwed with the projection 38 of the female luer portion 37 of the medical connecting device 1A. By turning the threaded tube 220 in the tightening direction in this state, the female luer portion 37 of the medical connecting device 1A and the male luer portion 211 of the male connector 200 are joined together, thereby connecting the tube 5 to the medical connecting device. 1A.

When a strong tensile force acts on the tubes 5, 5', the engaging projection 15 of the insertion portion 12 of the connector main body 10A and the engaging projection 35 of the cylindrical receiving portion 31 of the attachment 30A strongly contact each other due to this pulling force, and the attachment 30A is pulled. A force acts on the cylindrical receiving portion 31 in a radially expanding direction. However, since the regulating cylinder portion 23 of the screwing cylinder 20A covers the receiving cylinder portion 31 of the attachment 30A and restricts the elastic deformation of the receiving cylinder portion 31 in the radially expanding direction, the engaging projections 15 and 35 are not engaged. can be reliably maintained, and the attachment 30A can be reliably prevented from coming off from the medical connecting device 1A.

In the medical connecting device 1A of the second embodiment, two connecting portions accompanied by rotating operation of the screwing cylinders 20A and 220 can be provided for connecting the tubes 5 and 5'.
The attachment 30A of the second embodiment may have a tube holder portion for inserting and fixing a tube, instead of the female luer portion 38, like the attachment 30 of the first embodiment.

<Third Embodiment>
The medical connecting device 1B of the third embodiment shown in FIGS. 6 to 9 includes an attachment 30 having the same structure as that of the first embodiment, and a separate connector main body 10B similar to that of the second embodiment. and a threaded cylinder 20B. The medical connecting device 1B further includes a loosening prevention mechanism 50, an operation cylinder 60, and a torque limit mechanism 70, which act as described later. 6, 8 and 9A, the tube 5 (see FIGS. 1 to 3) is omitted for the sake of simplification. Details will be described below.

<Construction of connector body>
As in the second embodiment, the connector main body 10B includes a male luer portion 11, an insertion portion 12, an engaging projection 15 formed on the outer circumference of the insertion portion 12, and the male luer portion 11 and the insertion portion 12. It has an engaging projection 16 formed near the male luer portion 11 between them. Further, a pair of elastic pieces 51 are integrally formed between the engaging projection 16 and the insertion portion 12 on the outer periphery of the intermediate portion of the connector main body 10B. A claw 52 projecting radially outward is formed at the tip of the elastic piece 51 . These elastic pieces 51 constitute part of the loosening prevention mechanism 50 .

<Assembly of the first sub-assembly>
As shown in FIG. 8, the connector main body 10B and the attachment 30 are connected by inserting the insertion portion 12 of the connector main body 10B into the receiving tube portion 31 of the attachment 30 and snap-fitting the engaging projections 15 and 35 together. They are connected so as to be relatively rotatable, and the first subassembly SA1 is assembled. Since this snap fitting is the same as in the first and second embodiments, detailed description is omitted.

<Structure of screwing cylinder>
As shown in FIGS. 6 and 7A to 7C, the threaded tube 20B has a threaded portion 21, a mounting portion 22, and an action tube portion 25 in order from one end to the other end. . The action cylinder portion 25 has a slightly smaller diameter than the threaded portion 21, and the mounting portion 22 has the smallest diameter. An annular engaging projection 24 is formed on the inner periphery of the mounting portion 22, and is provided for connection with the connector main body 10B as in the second embodiment.

A pair of diametrically opposed elastic pieces 71 are formed at the tip of the action cylinder portion 25 . Each elastic piece 71 is defined by a pair of axially extending slits 26 formed at the tip of the action cylinder portion 25 . A claw 72 is formed on the outer surface of the elastic piece 71 . These elastic pieces 71 form part of the torque limit mechanism 70 .

The remaining arcuate portion 27 at the tip of the working cylinder portion 25 has a longer peripheral length than the elastic piece 71, and an engaging projection 28 extending in the peripheral direction is formed on the outer circumference of the tip edge at the center in the peripheral direction. The engagement projection 28 has a steep engagement surface on the far side and a slanted guide surface on the tip side, and is provided for connection with the operation barrel 60 as will be described later. The tip edge of the elastic piece 71 is set back from the tip edge of the arc portion 27, and the positions of the claw 72 of the elastic piece 71 and the engaging projection 28 are shifted in the axial direction.

A ratchet tooth 55 forming a part of the loosening prevention mechanism 50 is formed along the entire inner periphery of the action cylinder portion 25 . A portion of the ratchet teeth 55 (at two diametrically opposed locations) extends axially toward the open end. This extension is labeled 55a.

<Construction of operation cylinder>
As shown in FIGS. 6, 7A, and 7D, ratchet teeth 75 are formed along the entire inner periphery of the axially intermediate portion of the operating cylinder 60 . This ratchet tooth 75 constitutes a part of the torque limit mechanism 70 . One axial end of each tooth of the ratchet teeth 75 is provided as a steep engaging surface 75a perpendicular to the axis, and the other end is provided as an inclined guide surface 75b.

<Assembly of the second sub-assembly>
As shown in FIG. 7A, when the operating barrel 60 and the threaded tube 20B are brought close to each other while being coaxial and the threaded tube 20B is inserted into the operating tube 60, the guide surface of the engaging projection 28 of the threaded tube 20B moves toward the operating tube 60. As shown in FIG. When the screwing cylinder 20B is further pushed into the guide surface 75b of the ratchet teeth 75, the screwing cylinder 20B and the operating cylinder 60 are elastically deformed, and when the engaging projection 28 gets over the ratchet teeth 75, it is elastically restored. Snap fitting is thus completed, and the second subassembly SA2 is assembled as shown in FIG.

In the assembled state, the operation barrel 60 and the threaded barrel 20B are connected so as to be relatively rotatable. By engaging the engaging surface of the engaging protrusion 28 with the engaging surface 75a of the ratchet tooth 75 and engaging one end edge of the operating cylinder 60 with the annular stepped surface 21b at the tip of the threaded portion 21 of the screwed cylinder 20B, Relative movement in the axial direction is prohibited between the operating cylinder 60 and the threaded cylinder 20B. By this assembly, the pawl 72 of the elastic piece 71 of the screwing tube 20B is meshed with the ratchet teeth 75 of the operating tube 60, and the torque limit mechanism 70 is constructed.

The operating cylinder 60 has a restricting cylinder portion 61 axially protruding from the threaded cylinder 20B. The operation of this restricting cylinder portion 61 will be described later.

<Final assembly of medical connection device>
Finally, as shown in FIG. 8, the first subassembly SA1 and the second subassembly SA2 are coaxially brought closer together, and the connector main body 10B of the first subassembly SA1 is inserted into the threaded cylinder 20B of the second subassembly SA2. do. When the guide surface of the engaging projection 16 of the connector main body 10B hits the guide surface of the engaging projection 24 of the screwing tube 20B and the first subassembly SA1 is further pushed in, the screwing tube 20B is elastically deformed so as to expand its diameter. Then, when the engaging projection 16 gets over the engaging projection 24, it is elastically restored. Snap-fitting is thus completed, and the medical connection device 1B is assembled as shown in FIG. 9A.

In the assembled state, the threaded tube 20B is rotatably and axially immovably connected to the connector main body 10B. By the above assembly, the pawl 52 of the elastic piece 51 is meshed with the ring-shaped ratchet tooth 55, and the loosening prevention mechanism 50 is constructed.

In the assembly process, before the guide surfaces of the engaging projections 16 of the connector main body 10B come into contact with the guide surfaces of the engaging projections 24 of the screwing tube 20B, the claws 52 of the elastic pieces 51 of the connector main body 10B are engaged with the screwing tube 20B. The extended portion 55a of the ratchet teeth 55 of . As a result, when the connector main body 10B is pushed into the threaded tube 20B, the claws 52 of the elastic pieces 51 can be reliably meshed with the ring-shaped ratchet teeth 55 . Moreover, it is possible to prevent the claw 52 from hitting the ratchet tooth 55 and damaging the elastic piece 51 .

As shown in FIG. 9B, the ratchet teeth 55 of the loosening prevention mechanism 50 and the ratchet teeth 75 of the torque limit mechanism 70 form inclined surfaces on the tightening direction T side and steep surfaces on the loosening direction L side. The elastic modulus of the elastic piece 71 of the torque limit mechanism 70 is much larger than that of the elastic piece 51 of the loosening prevention mechanism 50 .

<Action of medical connecting device>
As in the first embodiment, the operation cylinder 60 is rotated in the tightening direction T while the male luer portion 11 of the medical connection device 1B is inserted into the female luer portion 101 of the female connector 100 (see FIG. 3). Then, the torque of the operating barrel 60 is transmitted to the screwed barrel 20B via the torque limit mechanism 70, and the screwed barrel 20B rotates together.

When the threaded tube 20B rotates in the tightening direction T, the elastic piece 51 of the loosening prevention mechanism 50 is elastically deformed and the engaging pawl 52 climbs over the ratchet teeth 55, so the threaded tube 20B idles with respect to the connector body 10B. .

By turning the screwing tube 20B in the tightening direction T, the screwing between the female thread 21a and the protrusion 103 progresses, and the male luer portion 11 and the female luer portion 101 are joined with a pressing force. In this manner, the male luer portion 11 and the female luer portion 101 can be joined with sufficient sealing performance. In this state, the protrusion 103 of the female connector 100 is in contact with the inner surface of the thread of the female thread 21a of the screw tube 20B.

When the operation cylinder 60 is further rotated, a large resistance is received from the joint between the male luer portion 11 and the female luer portion 101, and the rotational torque exceeds the set torque. Then, the engaging pawl 72 overcomes the ratchet teeth 75 with the elastic deformation of the elastic piece 71, so that the operating barrel 60 idles with respect to the screwing barrel 20B, and the rotational torque of the operating barrel 60 is transmitted to the screwing barrel 20B. will no longer be. As a result, excessive torque is not applied to the screwing tube 20B, and damage to the male luer portion 11 and the female luer portion 101 can be prevented, and the male luer portion 11 and the female luer portion 101 cannot be separated. You can avoid being bitten.

In the above-described joined state, even if unintended torque in the loosening direction L is applied to the threaded tube 20B, the ratchet teeth 55 are engaged with the claws 52 of the connector main body 10B. Rotation in the loosening direction is blocked. As a result, the inner side surface of the thread of the female thread 21a of the screwing tube 20B is kept in contact with the projection 103 of the female connector 100. As shown in FIG. Therefore, even when the pressure of the fluid is high, the female luer portion 101 and the male luer portion 11 do not move away from each other, so that sufficient sealing performance can be maintained and fluid leakage can be prohibited.

<About snap fitting structure>
When a strong tensile force acts on the tubes 5, 5' (see FIG. 3), this tensile force causes the engaging protrusion 15 of the insertion portion 12 of the connector body 10B and the engaging protrusion 35 of the receiving tubular portion 31 of the attachment 30 to be strongly engaged. Upon contact, force acts on the cylindrical receiving portion 31 of the attachment 30 in the radially expanding direction. However, since the regulating cylinder portion 61 of the operation cylinder 60 covers the receiving cylinder portion 31 of the attachment 30 and restricts the elastic deformation of the receiving cylinder portion 31 in the radially expanding direction, the engaging projections 15 and 35 are not engaged. can be reliably maintained.

<Fourth Embodiment>
A medical connecting device 1C according to the fourth embodiment shown in FIG. 10 has a connector main body 10B, a threaded tube 20B, a loosening preventing mechanism 50, and an operating tube 60, which have the same configuration as the medical connecting device 1B of the third embodiment. , a torque limit mechanism 70, and an attachment 30A having the same configuration as the medical connection device 1A of the second embodiment.

In the medical connecting device 1C of this embodiment, as in the medical connecting device 1A of the second embodiment, two connections accompanied by rotation operations of the threaded cylinders 20B and 220 are performed in order to connect the tubes 5 and 5'. part can be provided. Moreover, torque can be managed by using the operation tube 60 and the torque limit mechanism 70 in the rotating operation of the threaded tube 20B. Also in this embodiment, the regulating cylinder portion 61 of the operating cylinder 60 covers the receiving cylinder portion 31 of the attachment 30A.

<Fifth Embodiment>
A medical connecting device 1D according to the fifth embodiment shown in FIG. 11 is the same as the medical connecting device 1B of the third embodiment except for the connection structure between the connector body 10D and the attachment 30D. The connector main body 10</b>D has a receiving tubular portion 80 (first connecting portion) at the end opposite to the male luer portion 11 . The attachment 30</b>D has an inserting portion 90 (second connecting portion) that is inserted into the tubular receiving portion 80 . On the inner circumference of the tip end edge of the cylindrical receiving portion 80, three (plurality) engaging protrusions 85 extending in the circumferential direction are spaced apart in the circumferential direction, similarly to the cylindrical receiving portion 31 of the first to fourth embodiments. formed. The engaging projection 85 has an inclined guide surface on the tip side and a steep engaging surface on the far side. A hole 86 having a circumference equal to that of the engaging protrusion 85 is formed adjacent to the engaging protrusion 85 .

On the other hand, the inserting portion 90 of the attachment 30D has an annular engaging projection 95 like the inserting portion 12 of the first to fourth embodiments. The engagement protrusion 95 has a steep engagement surface on the tube holder portion 32 side and an inclined guide surface on the opposite side. The extended portion 61 of the operation tube 60 covers the receiving tube portion 80 of the connector main body 10D with a slight gap, and restricts its elastic deformation in the diameter-expanding direction.

<Sixth embodiment>
A medical connecting device 1E of the sixth embodiment shown in FIG. 12 differs from the third embodiment only in an attachment 30E. Instead of the tube holder portion 32 of the third embodiment, this attachment 30E has a connection portion 39 to which the end portion 301 of one flow tube portion of the three-way stopcock 300 (stopcock; medical component) is integrally connected. are doing. The attachment 30E may have an insertion portion as in the fifth embodiment.

The present invention is not limited to the above embodiments, and various aspects are possible.
In the above embodiment, the first engaging projection formed on the insertion portion forms a continuous circular ring. should be narrower than the circumference of the second engaging projection.
Further, both the first and second engaging projections may be circular rings, or the second engaging projections may form circular rings and a plurality of first engaging projections may be formed apart in the circumferential direction.
Features of various embodiments described above may be applied to other embodiments.

INDUSTRIAL APPLICABILITY The present invention can be applied to a medical connection device used in a medical connection system.

1, 1A, 1B, 1C, 1D, 1E medical connecting devices 5, 5' tubes (medical components)
10, 10A, 10B, 10D connector main body 11 male luer portion 12 insertion portion (first connecting portion)
13 channel 15 engagement projection (first engagement projection)
20, 20A, 20B Threaded tube 21 Threaded part 21a Internal thread 23 Regulating tube part 30, 30D, 30E Attachment 31 Receiving tube part (second connecting part)
32 Tube holder part (connection part)
35 engagement projection (second engagement projection)
36 hole 37 female luer part (connection part)
39 connecting portion 50 loosening preventing mechanism 60 operating cylinder 61 restricting cylinder portion 70 torque limit mechanism 80 receiving cylinder portion (first connecting portion)
85 engagement projection (second engagement projection)
86 hole 90 insertion portion (second connecting portion)
95 engagement projection (first engagement projection)
300 three-way stopcock (medical component)

Claims (7)

(a) a connector body having a male luer portion on one end side, a first connecting portion on the other end side, and a flow path extending from the male luer portion to the first connecting portion;
(b) having a threaded portion integrally provided or rotatably connected to the outer periphery between the male luer portion and the first connecting portion of the connector body and having a female thread formed on the inner periphery; and a threaded tube in which the threaded portion is arranged radially outward of the male luer portion;
(c) an attachment having, on one end side, a second connecting portion that is rotatably connected to the first connecting portion of the connector body, and having, on the other end side, a connecting portion to which a medical component is connected;
A medical connection device comprising:
One connecting portion of the first connecting portion and the second connecting portion is configured as a tubular receiving portion, and the other connecting portion is configured as an insertion portion inserted into the tubular receiving portion,
A first engaging projection is formed on the outer periphery of the insertion portion, and a second engaging projection is formed on the inner periphery of the receiving cylindrical portion,
When the insertion portion is inserted into the tubular receiving portion, the second engaging projection can overcome the first engaging projection with elastic deformation of the tubular receiving portion and/or the inserting portion. wherein the first engaging projection and the second engaging projection are engaged so that the connector body and the attachment are inhibited from moving apart from each other in an axial direction and are rotatably connected to each other. connection device. The first engaging projection has an annular shape, a plurality of the second engaging projections are spaced apart in the circumferential direction, and the cylindrical receiving portion is provided adjacent to the inner side of the second engaging projection. 2. The connecting device for medical use according to claim 1, wherein a hole having a circumference equal to or longer than the circumference of said second engaging projection is formed radially therethrough. The threaded tube is rotatably connected to the connector body and has a restricting tube portion extending in a direction opposite to the threaded portion. 3. The connecting device for medical use according to claim 1 or 2, wherein elastic deformation accompanying diameter is restricted. and a torque limit mechanism arranged between the operation barrel and the screw engagement barrel, wherein the torque limit mechanism rotates the operation barrel in the tightening direction. Torque is transmitted to the threaded cylinder, and when the rotational torque exceeds a set torque, the operation cylinder is idly rotated with respect to the threaded cylinder,
3. The connecting device for medical use according to claim 1, wherein the operation barrel has a restricting cylinder portion that covers the receiving cylinder portion and restricts elastic deformation accompanying diameter expansion of the receiving cylinder portion. The medical connection device according to any one of claims 1 to 4, wherein the connecting portion of the attachment is a tube holder portion. The medical connection device according to any one of claims 1 to 4, wherein the connecting portion of the attachment is a female luer portion. The connecting device for medical use according to any one of claims 1 to 4, characterized in that the medical component is integrally connected to the connecting portion of the attachment.

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