JP2005110842A - Connecting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a connecting device surely connecting a male connector to a female connector without loosening the connecting part after the connection and applyed to a medical connector put on the market as products at present. <P>SOLUTION: The connection between the female connector 1 and the male connector 2 can be secured by contacting three parts in total, or between the outer circumferential face of a lure part 21 of the male connector and the inner circumferential face of the female connector 1, between the surface of a male screw 12 of the female connector 1 and the surface of a female screw 221 on the inner circumferential face of the outer cylindrical body of the male connector, and between an elastic body 3 and the inner circumferential face of the outer cylindrical body of the male connector. In particular, the joining part of the elastic body 3 produces a resistance, when the screw part is turned, and eliminates the loosening after the connection. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

The present invention relates to a connector for connecting a tubular body, for example, used in various medical devices, infusion containers, liquid feeding devices and the like.

For connection of medical devices, locking of a male connector and a female connector is usually used in many cases. The following techniques have been developed as specific methods. As a first example, the inner diameter portion of the female connector formed in a taper shape and the tapered outer diameter portion of the male connector formed in a reverse taper shape corresponding thereto are fitted. is there. (Patent Document 1)

As a second example, for a male connector having a male connector with a male screw on the outer peripheral surface and a cylindrical outer cylinder having a female screw inside, the male connector is connected to the tapered inner diameter portion of the female connector. This is a method of fitting two connectors by fitting the male screw of the female connector to the female screw of the male connector while fitting the tapered outer diameter portion. (Patent Document 2)

As a third example, a valve body made of an elastic material is provided at the connection port of the female connector, and a male connector is inserted into the valve body to prevent the male connector from being pulled out of the female connector by the elastic force of the valve body. This is a method of fitting two connectors. (Patent Document 3)

As a fourth example, the outer periphery of the female connector is tapered from the connection port, and a stepped step is formed, a locking member is provided on the male connector, and the tapered inner diameter of the female connector is provided. This is a system in which two connectors are fitted by engaging a male connector locking body to the outer peripheral step of the female connector while fitting the tapered outer diameter portion of the male connector to the portion. (Patent Document 4)
JP-A-10-234 JP-A-9-108361 JP 2001-82647 A Shokai 62-42844

However, the method of providing the joint with the taper as in the first example may cause the connector to come off due to the impact in the coaxial direction, and also has the disadvantage that it is easy to come off by receiving a force in the rotational direction. is there.

In the fitting method of the second example, when the male connector and the female connector are mounted, the male screw of the female connector and the female screw of the male connector are screwed together. Here, both of the connecting point 1 “contact between the outer peripheral surface of the inner cylindrical portion of the male connector and the inner peripheral surface of the female connector” and the connecting point 2 “screwing of the female screw of the male connector and the male screw of the female connector” Thus, the male connector and the female connector are fixedly coupled. At this time, since the joint 1 is liquid-tight, it needs to be liquid-tight, and the joint 2 serves as a guide for guiding the connection between the male connector and the female connector and does not need to be liquid-tight. . However, if a method such as increasing the thread height of the male screw is used to increase the coupling strength of the coupling part 2 so that it does not loosen during use, the coupling part 1 is not first joined in a liquid-tight manner. The part 2 is tightened and the joint part 2 becomes a strong joint, but the joint part 1 is not in a liquid-tight state and cannot keep liquid-tight. For this reason, it is necessary to provide a play so that the connecting portion 1 is liquid-tight before setting the size of the connecting portion 2. However, although the portion provided with play at the coupling portion 2 can counter the tensile force in the axial direction, there is a drawback that the coupling strength is easily weakened when a force in the rotational direction is applied to either the male or female connector.

Further, in the system in which a valve body made of an elastic material is provided at the connection port of the female connector as in the third example and the male connector is inserted into the valve body to be fitted, some force is applied to the fitting portion. Sometimes, the male connector may be pushed back by the elasticity of the valve body.

In addition, when the female connector is formed with a stepped step portion and the male connector is provided with a locking body as in the fourth example, it is necessary to change the shape of the connector currently on the market as a medical product. Yes, it lacks versatility.

Accordingly, it is an object of the present invention to prevent loosening after the connection between the male connector and the female connector, so that the connecting portion does not loosen, and can be easily applied to the male connector currently on the market as a medical product, and It is an object of the present invention to provide a female connector having means for preventing looseness.

Such an object is achieved by the present inventions (1) to (9) below.

(1) A double-tube male connector having an outer cylindrical portion whose outer peripheral surface is formed of a tapered inner cylinder portion and surrounding the inner cylindrical portion, and an inner peripheral surface is the inner cylinder. A female connector having a cylindrical body formed in a tapered shape in contact with the outer peripheral surface of the portion, and having a male body threadedly engaged with the female screw on the outer peripheral surface, the connection port of the female connector The connecting device is characterized in that an elastic body is provided below the female connector male screw when the upper end is at the upper end.

(2) When the taper portion of the male connector and the female connector is liquid-tightly coupled, the elastic body is in a position where it is compressed by contacting with the outer cylindrical portion of the male connector. The connecting device according to (1).

(3) The connection device according to (1) or (2), wherein the male connector has a free lock mechanism that allows the outer cylinder portion to freely rotate with respect to the inner cylinder portion.

(4) The connection device according to (1) to (3), wherein the female connector and the elastic body are integrated by two-color molding.

(5) The connection device according to (1) to (4), wherein the elastic body includes two or more protrusions.

(6) The connection device according to any one of (1) to (4), wherein the shape of the elastic body is an annular protrusion.

(7) The connection device according to (6) above, wherein the surface of the elastic body is uneven.

(8) The connecting device according to (6) or (7) above, wherein a circumferential groove is provided at the base end of the female connector rather than the male screw, and the elastic body is provided in the groove. .

(9) The connection device according to any one of (1) to (8) above, wherein the female connector is a closed type mixed injection port in which the mixed injection port is closed when the connector is not connected.

When the elastic body is attached to the lower side of the female connector male screw as in the present invention, the male connector and the female connector are combined while turning the screw, and the elastic body and the lower end of the male connector outer cylinder portion are more elastic. The body is compressed, and the pressure applied to the male connector outer cylinder and elastic body is increased, and the pressure is transmitted from the elastic body to the female connector. As a result, the elastic body between the male connector outer cylinder inner peripheral surface and the female connector Pressure is transmitted.

Accordingly, the screw is not loosened, and the lower end of the male connector outer cylinder portion and the elastic body are brought into close contact with each other, so that it is possible to counter the force in the rotational direction. In addition, unlike the female connector and the male connector, the elastic body is soft and deforms, so even if the position of the elastic body is slightly shifted, the "inner cylinder outer peripheral surface of the male connector and the inner peripheral surface of the female connector" and “The lower end of the male connector outer cylinder and the elastic body” are in close contact with each other without any problem. Therefore, the male connector and the female connector can be reliably joined, and the connection is hardly loosened.

Moreover, since it can apply without changing the shape of the male connector currently circulated as a medical product, it does not require a great expense accompanying a change of a shape, and versatility also improves.

Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.

FIG. 1 is a longitudinal sectional view showing a connection form of a connector according to the present invention.

The connecting device is composed of a male connector 2 and a female connector 1. The male connector 2 has a double tube shape including an inner tube portion 21 and an outer tube portion 22 surrounding the inner tube portion 21, and a female screw 221 is formed on the inner peripheral surface of the outer tube portion 22. The female connector 1 includes a cylindrical body that is inserted between the inner cylindrical portion 21 and the outer cylindrical portion 22 of the male connector 2, and the outer peripheral surface of the cylindrical body is screwed into the female screw 221 of the outer cylindrical portion 22. A male screw 12 is formed. On the outer peripheral surface of the cylindrical body of the female connector 1, the elastic body 3 is attached to the lower groove portion from the region where the male screw 12 is formed. Here, it is desirable to provide this groove in order to prevent the mounting position of the elastic body 3 from shifting, but it is not essential depending on the mode. The elastic body 3 is attached in a state of protruding outward from the outer peripheral surface of the cylindrical body, and contacts the inner wall of the outer cylindrical portion of the male connector 2 when the male connector 2 and the female connector 1 are fitted. It is formed as follows. The female connector 1 and the elastic body 3 may be integrally formed by two-color molding or the like. By integrally molding, the assembly work of the female connector 1 and the elastic body 3 becomes unnecessary.

Here, the male connector 2 may be formed of a free lock mechanism that allows the outer cylinder portion 22 to freely rotate with respect to the inner cylinder portion 21. With such a mechanism, the male connector and the female connector can be connected without rotating the tube attached to the connector.

Note that the detailed shapes and dimensions of the female connector 1 and the male connector 2 refer to international standards of ISO594-1 and -2.

Examples of the constituent material of the female connector 1 and the male connector 2 include polyolefins such as polyethylene, polypropylene, ethylene-propylene copolymer, ethylene-vinyl acetate copolymer (EVA), polyvinyl chloride, polyvinylidene chloride, polystyrene, Polyamide, polyimide, polyamideimide, polycarbonate, poly- (4-methylpentene-1), ionomer, acrylic resin, polymethyl methacrylate, acrylonitrile-butadiene-styrene copolymer (ABS resin), acrylonitrile-styrene copolymer ( AS resin), butadiene-styrene copolymer, polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polycyclohexane terephthalate (PCT), polyester, poly Ether, polyetherketone (PEK), polyetheretherketone (PEEK), polyetherimide, polyacetal (POM), polyphenylene oxide, modified polyphenylene oxide, polysulfone, polyethersulfone, polyphenylene sulfide, polyarylate, aromatic polyester ( Liquid crystal polymer), polytetrafluoroethylene, polyvinylidene fluoride, and other resin materials such as fluorine-based resins, or blends, polymer alloys, and the like containing at least one of them. Further, other glass materials, ceramic materials, and metal materials can be used.

When the shape of the elastic body 3 is an annular protrusion, the elastic body 3 may be fitted into the lower part of the male screw 12 of the female connector 1 or may be molded in two colors. Further, a ring-shaped groove may be formed in the cylindrical body of the female connector 1, and the groove may be fitted into the groove. The outer diameter of the elastic body 3 is preferably 8.1 mm or more and 8.5 mm or less in a state in which the elastic body 3 is fitted to the female connector 1. Or you may adhere | attach the some elastic body 3 on the outer peripheral surface of the said cylinder.

The elastic body 3 is made of an elastic material that can be elastically deformed. Examples of the elastic material include natural rubber, isoprene rubber, butadiene rubber, styrene-butadiene rubber, nitrile rubber, chloroprene rubber, and butyl rubber. Various rubber materials such as acrylic rubber, ethylene-propylene rubber, hydrin rubber, urethane rubber, silicone rubber, fluoro rubber, styrene, polyolefin, polyvinyl chloride, polyurethane, polyester, polyamide, polybutadiene, transpoly Various thermoplastic elastomers such as isoprene-based, fluororubber-based, and chlorinated polyethylene are listed, and one or more of these can be used in combination.

Next, the connection between the female connector 1 and the male connector 2 described above will be described.
2 to 4 are longitudinal sectional views corresponding to FIG. 1 and are diagrams for explaining the state until the connection is completed in order.

First, FIG. 2 is a longitudinal sectional view showing a state when the lowermost part of the inner cylinder part 21 is positioned at the uppermost part of the female connector. In this way, the female connector 1 is positioned so that the central axis of the female connector 1 coincides with the central axis of the male connector 2, and the male connector 2 is moved from this state in the distal direction (direction indicated by the arrow in the figure). insert.

FIG. 3 is a longitudinal sectional view showing a state when the male connector 2 starts to be inserted into the female connector 1. In this manner, when the male screw of the female connector 1 is caught by the female screw of the male connector, the male connector 2 is inserted while being rotated clockwise.

FIG. 4 is a longitudinal sectional view showing a state in which the male connector 2 is completely connected to the female connector 1. In this way, the joint location 1 “the outer peripheral surface of the male connector inner cylinder portion 21 and the inner peripheral surface of the female connector 1”, the joint location 2 “the surface of the male screw 12 of the female connector 1 and the female screw 221 of the outer peripheral portion of the male connector. A total of three points of “surface” and connecting point 3 “elastic body 3 and lower end of male connector outer cylinder” come into contact. Here, in a state in which the joint portion 2 is not completely joined, the joint portion 1 is first liquid-tightly joined. At this time, the elastic body is compressed by the male connector outer cylinder at the joint portion 3. The rotation of the screw can be prevented.

Therefore, the male connector 2 and the female connector 1 can be reliably joined, and the connection is hardly loosened. The same effect can be obtained even when the male connector has a free lock mechanism.

Next, the shape and dimensions of the embodiment of the present invention will be described. The present invention was applied to the connection between a three-way stopcock co-injection port used for administering a plurality of drugs from the same route and a medical male connector.

The female connector 1 and the male connector 2 in FIG. 1 were injection molded with polycarbonate. The inner diameter and outer diameter of the upper end of the female connector 1 were 4.3 mm and 6.6 mm, the height of the male screw 12 was 0.55 mm, and the inner diameter was gradually reduced to 3.9 mm. Moreover, the circumferential groove | channel for fitting to an elastic body was provided in the width | variety of 1.5 mm between 2 mm-5 mm from the upper end part of the female connector 1, and the outer diameter of the groove | channel was 6.0 mm. The inner and outer diameters of the lower end of the inner cylinder portion 21 are 1.6 mm and 3.9 mm, respectively, and the outer diameter is gradually increased to 4.3 mm. The inner and outer diameters of the outer cylinder 22 are 8.0 mm and 10. It was 6 mm.

The elastic body 3 is made of silicone rubber, and considering the outer diameter of the female connector 1, the inner diameter and outer diameter of the elastic body are 5 mm and 7 mm, respectively, and the length perpendicular to the inner and outer diameters is 1.5 mm. .

Then, after attaching the elastic body 3 to the lower groove portion of the male screw 12 of the female connector 1, the male connector 2 was connected to the female connector 1.

As a result, as shown in FIG. 4, the coupling part 1 “the outer peripheral surface of the male connector inner cylinder portion 21 and the inner peripheral surface of the female connector 1”, the coupling part 2 “the surface of the male screw 12 of the female connector 1 and the outer cylinder of the male connector 2. The surface of the female thread 221 on the inner peripheral surface of the part ”and the joint part 3“ the elastic body 3 and the lower end of the male connector outer cylinder part ”come into contact with each other. Here, it is important that the connecting portion 1 is first liquid-tightly connected in a state where the screwing does not reach the end point at the connecting portion 2. At this time, since the elastic body is compressed by the male connector outer cylinder at the coupling portion 3, relative unintentional unintentional rotation can be prevented by screwing the male connector and the female connector. . It is important that the position of the elastic body is formed such that the above mechanism acts.

Therefore, the male connector and the female connector can be reliably joined, and the connection is hardly loosened.

Further, the same effect can be obtained by attaching a plurality of protrusions to the female connector as shown in FIG.

Further, the same effect can be obtained by making the surface of the elastic body uneven as shown in FIG.

Next, a case where the configuration of the present invention is applied to the connection between a closed type mixed injection port and a medical male connector will be described.

The cover member 44 in FIG. 7 was injection-molded with polyoxymethylene and the male connector 2 with polycarbonate. The outer diameter of the upper end portion of the seal member 43 was 7.7 mm, a cut 431 was made, the height of the male screw 42 was 0.5 mm, and the outer diameter of the elastic member 3 mounting portion of the cover member 44 was 6.6 mm. The inner and outer diameters of the lower end portion of the inner cylindrical portion 21 are 1.6 mm and 3.9 mm, respectively, and the outer diameter is gradually increased to 4.3 mm. The inner and outer diameters of the outer cylindrical portion 22 are 8.0 mm and 10 mm, respectively. 6 mm.

The elastic body 3 is made of silicone rubber, and considering the outer diameter of the cover member 44, the inner diameter and outer diameter of the elastic body are 5 mm and 7 mm, respectively, and the length perpendicular to the inner and outer diameters is 1.5 mm. .

Then, after attaching the elastic body 3 to the lower part of the male screw 42 of the closed type mixed injection port 4, the male connector 2 was inserted from the cut 431 of the closed type mixed injection port 4.

As a result, as shown in FIG. 8, the connection location 1 “the outer peripheral surface of the male connector inner cylinder portion 21 and the inner peripheral surface of the closed type mixed injection port 4”, and the connection location 2 “the surface of the male screw 42 of the closed type mixed injection port 4 The surface of the female connector 221 on the inner peripheral surface of the male connector outer surface 221 and the joint 3 “the elastic body 3 and the lower end of the male connector outer cylinder” come into contact with each other. Here, in a state in which the joint portion 2 is not completely joined, the joint portion 1 is first liquid-tightly joined. At this time, the elastic body is compressed by the male connector outer cylinder at the joint portion 3. The rotation of the screw can be prevented.

Therefore, the male connector 2 and the closed-type mixed injection port 4 can be reliably joined, and the connection is hardly loosened.

Further, the same effect can be obtained by attaching a plurality of protrusions to the female connector as shown in FIG.

Further, the same effect can be obtained by making the elastic body surface uneven as shown in FIG.

It is a longitudinal cross-sectional view which shows the connection form of the connector by this invention. It is a longitudinal cross-sectional view which shows a state when the lower end part of the inner cylinder part 21 is positioned to the female connector. It is a longitudinal cross-sectional view which shows the state by which the lower end part of the inner cylinder part 21 was inserted in the connection port of a female connector. It is a longitudinal cross-sectional view which shows the state which the connection of the female connector 1 and the male connector 2 was completed. 4 is a longitudinal sectional view showing a state in which the elastic body 3 is formed into a plurality of protrusions in the connection between the female connector 1 and the male connector 2. FIG. 4 is a longitudinal sectional view showing a state in which the elastic body surface is made uneven in connection between the female connector 1 and the male connector 2. It is a longitudinal cross-sectional view which shows the connection form of the closed type mixed injection port 4 and the male connector 2. FIG. It is a longitudinal cross-sectional view which shows the state which the connection of the closed type mixed injection port 4 and the male connector 2 was completed. It is a longitudinal cross-sectional view which shows the state which made the elastic body 3 into the some protrusion in the connection of the closed type mixed injection port 4 and the male connector 2. FIG. It is a longitudinal cross-sectional view which shows the state which made the elastic body surface uneven | corrugated in the connection of the closed type mixed injection port 4 and the male connector 2. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Female connector 11 Connection port 12 Male screw 2 Male connector 21 Inner cylinder part 22 Outer cylinder part 221 Female screw 3 Elastic body 4 Closed type mixed injection port 41 Connection port 42 Male screw 43 Seal member 431 Cut 44 Cover member

Claims (9)

A double-tube male connector having an outer cylindrical portion having an outer peripheral surface comprising a tapered inner cylindrical portion and surrounding the inner cylindrical portion, and an inner peripheral surface is an outer periphery of the inner cylindrical portion. A connecting device comprising a female connector having a cylindrical body formed in a tapered shape in contact with a surface and having a male body threadedly engaged with the female screw on an outer peripheral surface, the connection port of the female connector being an upper end In this case, the connecting device is characterized in that an elastic body is provided below the male connector male screw. When the taper portion of the male connector and the female connector is liquid-tightly coupled, the elastic body is compressed by contacting the male connector outer cylinder portion, thereby compressing the male connector and the female connector. The connecting device according to claim 1, wherein relative free rotation is prevented. The connection device according to claim 1 or 2, wherein the male connector has a free lock mechanism that allows the outer tube portion to freely rotate with respect to the inner tube portion. The connection tool according to claim 1, wherein the female connector and the elastic body are integrated by two-color molding. The connecting device according to claim 1, wherein the elastic body is composed of two or more protrusions. The connection device according to claim 1, wherein the elastic body has an annular protrusion. The connection device according to claim 6, wherein the elastic body surface is uneven. The connecting device according to claim 6 or 7, wherein a circumferential groove is provided at a base end portion of the female connector rather than the male screw, and the elastic body is provided in the groove. The connection tool according to any one of claims 1 to 8, wherein the female connector is a closed type mixed injection port in which the mixed injection port is closed when the connector is not connected.

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