JP7389311B2 - female connector - Google Patents

Description

The present invention relates to a female connector suitable for a mixed spout of a three-way stopcock, etc.

Conventionally, a female connector suitable for a three-way stopcock mixed injection port has a hollow cylindrical elastic body with an open end at the bottom and a closed end at the top, and a cylindrical inner surface. A device is known that includes a casing that holds the elastic body (for example, see Patent Document 1).

In the female connector of Patent Document 1, the end surface of the elastic body on the closed end side has a slit that is pushed downward and opened by the male connector when the male connector is connected, thereby communicating the male connector with the inside of the elastic body. will be provided. Further, the housing of the female connector includes an insertion portion that has an inner diameter corresponding to the outer diameter of the male connector, contacts the radial outer circumference of the closed end, and supports the closed end in the radial direction.

Before and after connecting a male connector to a female connector and using it, it is necessary to wipe and disinfect the end surface of the female connector on the side where the male connector is connected to prevent infection.

Special table 2018-509253 publication

However, according to the female connector of Patent Document 1, the flow path side of the three-way stopcock to which this is applied is connected to the E. O. During the pressurization process during sterilization with (ethylene oxide) gas, the elastic body of the female connector may be pushed upward, causing the upper end surface of the elastic body to protrude above the upper end surface of the insertion portion of the housing. In this case, it is necessary to disinfect the outer periphery of the protruding portion of the elastic body.

In view of the problems of the prior art, an object of the present invention is to provide a female connector that is easy to disinfect.

The female connector of the present invention is
The inside is a hollow cylindrical elastic body, with the lower end being an open end and the upper end being a closed end, and when a male connector is connected, it is pushed downward by the male connector and opened. The closed end is provided with a slit that allows communication between the male connector and the inside of the elastic body when the male connector is inserted , and the closed end is displaced downward when the male connector is pushed downward. , and the elastic body that is pushed outward in the radial direction when the male connector is inserted ;
a casing having a cylindrical inner surface and holding the elastic body by the inner surface;
The housing has an inner diameter corresponding to an outer diameter of the male connector and is in contact with a radial outer circumference of the closed end, such that the upper end surface of the closed end is below the upper end surface of the housing. It has an insertion part that supports it in the radial direction at the position of
The insertion part includes a presser part that protrudes in the axial direction of the elastic body and contacts the upper end surface or the radial outer circumference of the closed end to prevent upward displacement of the closed end ,
The casing is
an enlarged inner diameter portion that is adjacent to the lower side of the insertion portion via an outer transition portion and has a larger inner diameter than the insertion portion;
a large inner diameter portion located below the enlarged inner diameter portion and having a larger diameter than the enlarged inner diameter portion;
The elastic body includes an enlarged outer diameter portion that is adjacent to the lower side of the closed end via an inner transition portion and has an outer diameter larger than the outer diameter of the closed end;
A housing space is formed between the large inner diameter portion and the enlarged outer diameter portion to accommodate a portion of the elastic body when the male connector is connected;
The outer transition portion, the enlarged inner diameter portion, and the inner transition portion provide an escape space for escaping a portion of the closed end portion that is deflected downward and pushed outward in the radial direction when the male connector is connected. , characterized in that it is defined separately from the accommodation space .

In the present invention, the end surface of the closed end is supported by the insertion section at a position below the upper end surface of the casing, and the presser provided on the insertion section prevents the closed end from being displaced upward. Therefore, the upper end surface of the closed end portion is less likely to be displaced upward than the upper end surface of the housing.

Therefore, the female connector of the present invention is easy to disinfect since it is sufficient to disinfect the upper end surface of the elastic body and there is no need to disinfect the outer periphery of the elastic body.
According to this, when connecting a male connector to a female connector, the slit of the elastic body is pushed open while the closed end of the elastic body is pushed and moves toward the connection direction side relative to the insertion part of the casing. At this time, a portion of the moved closed end escapes into the relief space, so that the male connector is smoothly inserted inside the elastic body.
Further, as the insertion of the male connector progresses, a portion of the elastic body below the closed end portion is accommodated in the accommodation space. This allows the male connector to be easily inserted and connected to the female connector.

In the present invention, it is preferable that the presser portion is constituted by an annular protrusion that protrudes from an upper end of the inner wall of the insertion portion in the axial direction and contacts the upper end surface of the closed end.

According to this, upward displacement of the closed end can be reliably prevented.

In the present invention, the pressing portion is a pressing surface formed by an inner wall of the insertion portion, and a cross section perpendicular to the circumferential direction of the inner wall is curved in a direction opposite to the axial direction toward both ends thereof, and the pressing portion is a pressing surface formed by an inner wall of the insertion portion. The pressing surface may press the radial outer periphery of the closed end of the body in the axial direction.

In this case as well, upward displacement of the closed end can be prevented as much as possible.

FIG. 1 is a sectional view showing a three-way stopcock including a female connector according to a first embodiment of the present invention. FIG. 2 is a cross-sectional perspective view showing an elastic body in the three-way stopcock of FIG. 1. FIG. FIG. 3A is a sectional view showing how the male connector is inserted into the three-way stopcock of FIG. 1, and FIG. 3B is a sectional view showing how the male connector is completely inserted. It is a sectional view showing a three-way stopcock including a female connector according to a second embodiment of the present invention.

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a female connector 3 connected to a side pipe 2 of a three-way stopcock 1 according to a first embodiment of the present invention. This female connector 3 has an elastic body 4 into which a male connector is inserted, a housing 5 having a cylindrical inner surface and holding the elastic body 4 by the inner surface, and a space between the elastic body 4 and the housing 5. A housing space 6 is formed to accommodate a part of the elastic body 4 when the male connector is inserted.

As the male connector, for example, one having a male luer taper can be used.

The elastic body 4 has a hollow cylindrical shape, and has an open end 7 with an open upper end and a closed end 8 with a closed lower end. The elastic body 4 can be made of silicone rubber, for example.

As shown in FIG. 2, the elastic body 4 has a slit 9 at the closed end that is pushed downward by the male connector and opens to communicate between the male connector and the inside of the elastic body 4. 8. However, when the male connector is not connected, the bottom 10 of the slit 9 is closed, and the female connector 3 is kept sealed from the outside. In other words, the female connector 3 uses a split septum instead of a mechanical valve to realize cefiflow (closed infusion).

The housing 5 has an inner diameter corresponding to the outer diameter of the male connector and is in contact with the radial outer periphery of the closed end 8 of the elastic body 4, with the upper end surface of the closed end 8 being below the upper end surface of the housing 5. an expanded inner diameter portion 13 that is adjacent to the insertion portion 11 in the D direction via an outer transition portion 12 and has a larger inner diameter than the insertion portion 11; The large inner diameter portion 28 is located on the direction side and has a larger diameter than the enlarged inner diameter portion 13.

The elastic body 4 also includes an enlarged outer diameter portion 15 that is adjacent to the closed end portion 8 in the D direction via the inner transition portion 14 and has an outer diameter larger than the outer diameter of the closed end portion 8 . The accommodation space 6 is formed between the large inner diameter portion 28 and the enlarged outer diameter portion 15 .

The outer transition part 12 , the enlarged inner diameter part 13 , and the inner transition part 14 of the elastic body 4 create a relief space 16 that allows a part of the closed end 8 of the elastic body 4 to escape when the male connector is inserted, which is different from the accommodation space 6 . Separately defined.

The insertion portion 11 includes an annular protrusion 17 that protrudes from the upper end of its inner wall in the axial direction of the elastic body 4 . The annular protrusion 17 protrudes in the axial direction, comes into contact with the upper end surface of the closed end 8, and functions as a presser for preventing upward displacement of the closed end 8.

The housing 5 includes a first portion 18 integrally connected to the side pipe 2 and a second portion 19 joined to the first portion 18. The accommodation space 6 is formed between the elastic body 4 and a portion where the first portion 18 and the second portion 19 are joined. The open end 7 of the elastic body 4 is supported in a sealed manner by a stepped portion 20 provided on the inner surface of the first portion 18 and is connected to the side tube 2 .

The side pipe 2 is connected to the base 21 of the three-way stopcock 1. An inlet pipe 22 and an outlet pipe 23 are connected to the base 21 . The base 21 includes a cylindrical body 24 for switching the connection between the side tube 2, the introduction tube 22, and the outlet tube 23. The cylindrical body 24 includes an internal connection path 25 for relaying the side pipe 2, the inlet pipe 22, and the outlet pipe 23 to switch their connection state.

Specifically, when the cylindrical body 24 is positioned at an angle as shown in FIG. 1, the side pipe 2, the inlet pipe 22, and the outlet pipe 23 are in a connected state. Furthermore, by rotating the cylindrical body 24 by 90 degrees from the angle shown in FIG. can. Further, by tilting the cylindrical body 24 at an angle of 45° or the like from the angle shown in the figure, all connections between the side pipe 2, the introduction pipe 22, and the outlet pipe 23 can be cut off.

Note that the upper end of the plate-like member that partitions the pipe line extending from the side pipe 2 to the open end 7 of the elastic body 4 to the left and right is located above a small stepped portion that exists in the vertically intermediate portion of the first portion 18. To position.

FIG. 3A shows the state when the male connector 26 is connected to the three-way stopcock 1, and FIG. 3B shows the state when the connection of the male connector 26 is completed. As shown in FIG. 3A, when connecting the male connector 26 to the female connector 3, the male connector 26 is pressed against the closed end 8 of the elastic body 4 and inserted inside the elastic body 4 along the direction D. do.

At this time, as shown in FIG. 3A, the closed end portion 8 of the elastic body 4 is pushed in the D direction and pushed further toward the D direction side than the insertion portion 11 of the housing 5. Furthermore, the male connector 26 that has entered the slit 9 (see FIG. 2) pushes the connector radially outward. As a result, a part of the closed end 8 flows into the relief space 16, and the relief space 16 is filled with the elastic body 4.

Further, at this time, due to the pressing force from the male connector 26, the intermediate portion of the elastic body 4 protrudes into the accommodation space 6 between it and the housing 5, and a portion thereof is accommodated in the accommodation space 6. In this way, the male connector 26 can reliably pass through the bottom 10 (see FIG. 2) of the slit 9 of the elastic body 4.

By further inserting the male connector 26, the male connector 26 is joined to the annular protrusion 17 of the insertion portion 11 by the male luer taper, resulting in the state shown in FIG. 3B. Thereby, the connection of the male connector 26 to the female connector 3 is completed, and the male connector 26 is brought into a state in which it is hermetically connected to the side tube 2 via the elastic body 4.

According to this embodiment, when the male connector 26 is connected to the female connector 3, the closed end 8 of the elastic body 4 is pushed and moved in the D direction, and a part of the closed end 8 enters the relief space 16. Therefore, the male connector 26 can be smoothly inserted into the elastic body 4 and can be reliably passed through the bottom 10 of the slit 9 of the elastic body 4.

Further, the end surface of the closed end 8 is supported by the insertion section 11 at a position below the upper end surface of the housing 5, and the annular protrusion 17 serving as a presser provided on the insertion section 11 supports the closed end 8. Since upward displacement of the closed end portion 8 is prevented, the upper end surface of the closed end portion 8 is less likely to be displaced upward than the upper end surface of the housing 11.

Therefore, the female connector 3 of this embodiment is easy to disinfect because it is sufficient to disinfect the upper end surface of the elastic body 4 and there is no need to disinfect the outer periphery of the elastic body 4.

FIG. 4 shows a female connector 3a connected to a side pipe 2 of a three-way stopcock 1 according to a second embodiment of the present invention. As shown in FIG. 4, the insertion section 11 is formed by the inner wall of the insertion section 11 instead of the annular protrusion 17 described above, and extends the radial outer periphery of the closed end 8 of the elastic body 4 in the axial direction of the elastic body 4. It is provided with a pressing surface 27 that presses against. The pressing surface 27 has a shape in which a cross section perpendicular to the circumferential direction of the inner wall is curved toward both ends thereof in a direction opposite to the axial direction.

That is, the pressing surface 27 protrudes in the axial direction of the elastic body 4 and comes into contact with the radial outer periphery of the closed end 8 to function as a presser portion that prevents the closed end 8 from being displaced upward. Other points are the same as in the first embodiment.

According to this embodiment, as in the case of the first embodiment, the end surface of the closed end portion 8 is supported by the insertion portion 11 at a position below the upper end surface of the housing 5, and the insertion portion 11 is provided with a Since upward displacement of the closed end 8 is prevented by the pressing surface 27 serving as a holding portion, the upper end surface of the closed end 8 is less likely to be displaced upward than the upper end surface of the housing 11 .

Therefore, the female connector 3a of this embodiment is easy to disinfect since it is sufficient to disinfect the upper end surface of the elastic body 4 and there is no need to disinfect the outer periphery of the elastic body 4.

Although the embodiments of the present invention have been described above, the present invention is not limited thereto. For example, the female connector of the present invention may be applied not only to the side pipe 2 (mixed injection part) of the three-way stopcock 1 but also to a female connector such as a Cefio flow connector.

DESCRIPTION OF SYMBOLS 1... Three-way stopcock, 2... Side pipe, 3, 3a... Female connector, 4... Elastic body, 5... Housing, 6... Housing space, 7... Open end, 8... Closed end, 9... Slit, 10... Bottom part, 11... Insertion part, 12... Outer transition part, 13... Enlarged diameter inner diameter part, 14... Inner transition part, 15... Enlarged diameter outer diameter part, 16... Relief space, 17... Annular protrusion part, 18... First part , 19... Second portion, 20... Step portion, 21... Base, 22... Introductory pipe, 23... Outlet pipe, 24... Cylindrical body, 25... Internal connection path, 26... Male connector, 27... Pressing surface, 28... Large Inner diameter.

Claims (3)

The inside is a hollow cylindrical elastic body, with the lower end being an open end and the upper end being a closed end, and when a male connector is connected, it is pushed downward by the male connector and opened. The closed end is provided with a slit that allows communication between the male connector and the inside of the elastic body when the male connector is inserted , and the closed end is displaced downward when the male connector is pushed downward. , and the elastic body that is pushed outward in the radial direction when the male connector is inserted ;
a casing having a cylindrical inner surface and holding the elastic body by the inner surface;
The housing has an inner diameter corresponding to an outer diameter of the male connector and is in contact with a radial outer circumference of the closed end, such that the upper end surface of the closed end is below the upper end surface of the housing. It has an insertion part that supports it in the radial direction at the position of
The insertion part includes a presser part that protrudes in the axial direction of the elastic body and contacts the upper end surface or the radial outer circumference of the closed end to prevent upward displacement of the closed end ,
The casing is
an enlarged inner diameter portion that is adjacent to the lower side of the insertion portion via an outer transition portion and has a larger inner diameter than the insertion portion;
a large inner diameter portion located below the enlarged inner diameter portion and having a larger diameter than the enlarged inner diameter portion;
The elastic body includes an enlarged outer diameter portion that is adjacent to the lower side of the closed end via an inner transition portion and has an outer diameter larger than the outer diameter of the closed end;
A housing space is formed between the large inner diameter portion and the enlarged outer diameter portion to accommodate a portion of the elastic body when the male connector is connected;
The outer transition portion, the enlarged inner diameter portion, and the inner transition portion provide an escape space for escaping a portion of the closed end portion that is deflected downward and pushed outward in the radial direction when the male connector is connected. , a female connector characterized in that the female connector is defined separately from the accommodation space . 2. The female connector according to claim 1, wherein the holding portion is constituted by an annular protrusion that protrudes from an upper end portion of an inner wall of the insertion portion in a direction toward the axial direction. The pressing portion is a pressing surface formed by the inner wall of the insertion portion, and a cross section of the inner wall perpendicular to the circumferential direction is curved toward both ends in a direction opposite to the axial direction to prevent the closure of the elastic body. The female connector according to claim 1, characterized in that it is constituted by the pressing surface that presses the radial outer periphery of the end portion in the axial direction.

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