JP4500619B2 - Medical connector - Google Patents

Description

  The present invention relates to a medical connector configured such that a drug solution can be mixed from a syringe into a fluid flowing in a medical tube constituting an infusion circuit such as an infusion.

  This type of medical connector includes a hollow connector main body for connecting a medical tube and an insertion port provided on the outer periphery of the connector main body for inserting a mouth portion of a syringe (see, for example, Patent Document 1). . A plate-like valve made of an elastic material for blocking outside air is provided in the insertion port. A slit is formed in the valve, and when inserting the mouth of the syringe into the insertion port, the slit is pushed open by the mouth and the mouth is inserted into the insertion port.

  However, in the conventional medical connector, when the mouth portion of the syringe is inserted into the insertion port, only the valve portions on both sides of the opened slit are in contact with the mouth portion of the syringe. The syringe was easily wobbled with the position as a fulcrum.

  In order to solve this problem, a male screw is provided on the outer periphery of the insertion port, a cylindrical body is provided in the syringe so as to surround the mouth of the syringe, a female screw is provided on the inner peripheral surface of the cylindrical body, and a male screw and a female screw are provided. There is also known one that prevents wobbling of the syringe with respect to the medical connector by screwing (see, for example, Patent Document 2).

However, such a medical connector must be rotated or screwed with respect to the medical connector when the syringe is inserted and when the syringe is removed, and screwed or unscrewed. Operation becomes complicated.
Japanese Patent Laid-Open No. 2002-306610 (page 9, FIG. 12) Japanese Unexamined Patent Publication No. 2004-463 (page 9, FIG. 5)

  The present invention has been made in view of the above points, and an object of the present invention is to provide a medical connector capable of preventing wobbling of a syringe without complicated operations when inserting and removing the syringe. .

  In order to achieve the above object, the present invention comprises a hollow connector body for connecting a medical tube and an insertion port provided on the outer periphery of the connector body for inserting a mouth portion of a syringe. Is provided with a plate-like valve made of an elastic material for blocking outside air. The valve is formed with a slit. When the mouth of the syringe is inserted into the insertion port, the slit is formed by the mouth. The medical connector which is pushed open so that the mouth portion is inserted into the insertion port is improved as follows.

That is, in the medical connector of the present invention, a bush made of an elastic material is fitted in the insertion port, and the valve is integrated with the bush so as to close the end of the bush on the opening end side of the insertion port. The inner periphery of the bush is formed in the insertion port with a large-diameter hole that receives the valve portions on both sides of the slit that is pushed open by inserting the mouth of the syringe into the insertion port. Formed in a stepped hole shape with the mouth of the inserted syringe fitted and held in a liquid-tight manner , extending from the large-diameter hole to the connector body, and having a small-diameter hole with a smaller inner diameter than the large-diameter hole It is characterized by being.

  According to this configuration, when the slit is pushed open by inserting the mouth portion of the syringe into the insertion port, the valve portions on both sides of the slit escape radially outward within the large diameter hole portion, and the mouth portion is the bush. It is inserted smoothly without being supported near its end. And the opening | mouth part of a syringe fits with the said small diameter hole part, and the wobble of a syringe with respect to a medical connector can be prevented. Moreover, since the small diameter hole is formed of an elastic material, it can be fitted without damaging the mouth of the syringe. Further, the close contact of the mouth with the small-diameter hole is ensured, and when the chemical is injected from the syringe, the chemical can be prevented from flowing backward from the small-diameter hole to the large-diameter hole.

  In addition, since it is not necessary to rotate and screw the syringe like a conventional medical connector, the syringe can be easily inserted into or removed from the medical connector. Further, since the valve is formed at the end of the bush on the opening end side of the insertion port, the opening end of the insertion port and the surface of the valve are close to each other, and the opening end of the insertion port and the surface of the valve are easily disinfected. be able to.

  By the way, the bush is slightly compressed in the axial direction by the friction force acting between the mouth and the valve when the mouth of the syringe is inserted, and the force in the direction of pushing the syringe from the insertion port acts on the syringe by the elastic restoring force of the bush. To do. Here, if the portion near the opening end of the insertion port is formed in a taper shape whose inner peripheral surface is reduced in diameter toward the opening end, the end (valve) of the bushing is caused by the elastic restoring force of the bushing. When returning to the opening end side of the insertion port, the valve is gradually compressed radially inward due to the tapered shape of the insertion port, and the frictional force between the mouth portion of the syringe and the valve portions on both sides of the slit becomes stronger, It becomes difficult for the syringe to come out of the valve. For this reason, it is possible to prevent the mouth portion of the syringe from being accidentally dropped from the insertion port while the medical solution is being mixedly injected into the medical tube via the medical connector by the syringe, which is advantageous.

  Further, when the fluid flowing in the connector main body flows into the inner periphery of the bush while the syringe is removed from the insertion port, the fluid may flow to the outside from the slit of the valve. In this case, if a check valve is provided in the insertion port between the end surface of the bushing on the connector body side and the connector body to prevent the fluid flowing in the connector body from flowing into the inner periphery of the bushing. The above problems do not occur and are advantageous.

  An embodiment of the present invention will be described with reference to FIGS. FIG. 1 is an explanatory sectional view showing the medical connector of the present embodiment, and FIG. 2 is an explanatory sectional view showing a state in which a syringe is inserted into the medical connector of the present embodiment.

  As shown in FIG. 1, a medical connector according to an embodiment of the present invention includes a hollow connector body 1 that connects medical tubes (not shown) to both ends, and a mouth of a syringe 2 provided at the center of the outer periphery of the connector body 1. And an insertion port 3 for inserting the portion 21.

  The insertion port 3 includes a substantially bottomed cylindrical port base 31 formed integrally with the connector main body 1, and a cylindrical port main body 32 that is fitted and fixed to the opening end of the port base 31. A communication hole 4 communicating with the flow path 1 a in the connector main body 1 is formed at the bottom 33 of the port base 31, and a pair of protrusions 34 are provided on both sides of the communication hole 4. A cap-shaped cover 5 including a peripheral wall 51 and a top plate 52 is provided on the inner periphery of the port base 31. A hole 53 is formed in the top plate 52.

  A substantially cylindrical bush 7 made of an elastic material such as rubber is fitted in the insertion port 3 so as to be positioned on the cover 5. A disc-like valve 8 for blocking outside air is integrally formed at the end of the bush 7 on the opening end side of the insertion port 3. Further, a slit 81 is formed in the valve 8. Since the valve 8 is formed at the end of the bush 7 on the opening end side of the insertion port 3, the opening end of the insertion port 3 and the surface of the valve 8 are close to each other. Can be easily disinfected.

  The port body 32 is formed with a tapered portion 32a which is positioned on the opening end side of the insertion port 3 and gradually decreases in diameter toward the opening end side, and is positioned on the port base portion 31 side. A large-diameter portion 32b having a larger inner diameter is formed. The tapered portion 32a and the large diameter portion 32b are connected via a step portion 32c. A step portion 71 is also formed on the outer periphery of the bush 7, and this step portion 71 is engaged with the step portion 32 c of the port main body 32, and the end portion of the bush 7 on the connector main body 1 side is connected to the top plate 52 of the cover 5. By sitting, the bush 7 is sandwiched between the port body 32 and the cover 5.

  The inner periphery of the bush 7 has a stepped hole having a large diameter hole portion 72 on the valve 8 side and a small diameter hole portion 73 extending from the large diameter hole portion 72 to the connector body 1 side and having a smaller inner diameter than the large diameter hole portion 72. It is formed into a shape. The large-diameter hole portion 72 can receive portions of the valve 8 on both sides of the slit 81 that is pushed open by inserting the mouth portion 21 of the syringe 2 into the insertion port 3.

  Thus, when the mouth portion 21 of the syringe 2 is inserted into the insertion port 3, the portion of the valve 8 on both sides of the slit 81 that is pushed open by the mouth portion 21 and enters the bush 7 does not get in the way. The mouth 21 of the syringe 2 can be easily inserted into the inner periphery of the bush 7.

  The small-diameter hole 73 is fitted with the mouth 21 of the syringe 2 inserted into the bush 7. Thereby, the syringe 2 is firmly supported and the wobbling of the syringe 2 with respect to the medical connector can be prevented. Moreover, since the small diameter hole part 73 is formed of the elastic material, it can be fitted without damaging the mouth part 21 of the syringe 2. In addition, the adhesion of the mouth portion 21 to the small diameter hole 73 is also secured, and when the chemical liquid is injected from the syringe 2, the chemical liquid is prevented from flowing backward from the small diameter hole 73 to the large diameter hole 72 and leaking outside. it can.

  A disc-shaped check valve 9 made of an elastic material such as rubber is provided in the cover 5 while being sandwiched between the top plate 52 and the projection 34. The check valve 9 normally closes the hole 53 formed in the top plate 52 by being in close contact with the top plate 52 and prevents the fluid flowing in the connector main body 1 from flowing into the inner periphery of the bush 7. . Thereby, it is possible to prevent the fluid flowing in the connector main body 1 from leaking outside through the slit 81 of the valve 8 via the inner periphery of the bush 7.

  As shown in FIG. 2, the check valve 9 is bent into a substantially U shape when a liquid medicine is injected from the syringe 2 inserted into the insertion port 3, and the top plate 52 is not pressed by the protrusion 34. The close contact with is released. Thereby, the chemical liquid flows from the portion where the close contact between the top plate 52 and the check valve 9 is released to the flow path 1 a in the connector main body 1 through the communication hole 4.

  According to the medical connector of this embodiment, the mouth portion 21 of the syringe 2 is fitted into the small-diameter hole portion 73 of the bush 7 and is firmly supported as described above. Therefore, the syringe 2 is made like a conventional medical connector. There is no need to screw it into the insertion port 3, so that the syringe 2 can be easily inserted or removed from the medical connector.

  As shown in FIG. 2, the bush 7 is slightly compressed in the axial direction by the frictional force acting between the mouth 21 and the valve 8 when the mouth 21 of the syringe 2 is inserted, and the elastic restoring force of the bush 7. As a result, a force in a direction of pushing the syringe 2 from the insertion port 3 acts on the syringe 2.

  In the present embodiment, when the end portion (valve 8) of the bush 7 moves back to the opening end side of the insertion port 3 by the elastic restoring force of the bush 7, the valve 8 is gradually radially inward by the tapered portion 32a. Compressed, the frictional force between the mouth portion 21 of the syringe 2 and the valve 8 portions on both sides of the slit 81 becomes strong, and the syringe 2 is difficult to come out of the valve 8. For this reason, it is possible to prevent the mouth portion 21 of the syringe 2 from being accidentally dropped from the insertion port while the syringe 2 is infused with the medical solution via the medical connector.

Explanatory sectional drawing which showed the medical connector of this embodiment. Explanatory sectional drawing which shows the state which inserted the syringe into the medical connector of this embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Connector main body, 2 ... Syringe, 21 ... Mouth part, 3 ... Insertion port, 32a ... Tapered shape part, 7 ... Bush, 72 ... Large diameter hole part, 73 ... Small diameter hole part, 8 ... Valve, 81 ... Slit, 9: Check valve.

Claims (3)

A hollow connector body for connecting a medical tube, and an insertion port provided on the outer periphery of the connector body for inserting a mouth portion of a syringe, and an elastic material for blocking outside air in the insertion port A formed plate-like valve is provided, and a slit is formed in the valve. When the mouth portion of the syringe is inserted into the insertion port, the slit is pushed open by the mouth portion, and the mouth portion is inserted into the insertion port. In the medical connector in which is inserted,
A bush made of an elastic material is fitted into the insertion port, and the valve is formed integrally with the bush so as to close the end of the bush on the opening end side of the insertion port.
The inner periphery of the bush includes a large-diameter hole portion that receives valve portions on both sides of the slit that is pushed open by inserting the mouth portion of the syringe into the insertion port, and a syringe that is inserted into the insertion port. It is formed in a stepped hole shape having a small-diameter hole portion that has an inner diameter smaller than the large-diameter hole portion that extends from the large-diameter hole portion to the connector body side and is held in a liquid-tight manner. A medical connector.   The medical connector according to claim 1, wherein a portion of the insertion port near the opening end has a tapered shape in which an inner peripheral surface is reduced in diameter toward the opening end.   A check valve is provided in the insertion port between the end surface of the bush on the connector body side and the connector body to prevent fluid flowing in the connector body from flowing into the inner periphery of the bush. The connector according to claim 1 or 2, wherein

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