JP7167407B2 - connector - Google Patents

Description

TECHNICAL FIELD The present invention relates to a connector used for mixed injection into an infusion line.

2. Description of the Related Art Conventionally, there has been known a connector that is connected in the middle of an infusion line and used for co-injection of a drug solution or the like into the infusion line (see, for example, Patent Document 1).

The connector includes an inflow port into which a liquid such as an infusion solution flows from an infusion line, an outflow port through which the liquid flows out to the infusion line, and a connection space connecting the inflow port and the outflow port. a flexible bottomed cylindrical member that is connected to the connector body and forms a co-injection channel used for co-injection into the infusion line; and a cover member that covers the bottomed cylindrical member and fixes it to the connector body. Prepare.

The bottomed cylindrical member has a cavity communicating with the connection space, and is connected to the connector main body in an inverted state so that the bottom surface is positioned away from the connection space. In addition, the bottomed cylindrical member has a mixed injection port on the bottom surface, and the mixed injection port opens and communicates with the cavity when pressed toward the connection space by the tip of the syringe used for mixed injection. . As a result, the co-injection port and the hollow portion form a co-injection path that guides the drug solution or the like co-injected from the syringe to the connecting space portion.

Japanese Patent Application Laid-Open No. 2004-209278

In the connector described in Patent Literature 1, the liquid such as an infusion that has flowed from the infusion line through the inflow port directly flows out from the connection space to the infusion line through the outflow port, except when mixed injection is performed.

However, since the cavity is a dead space that is not affected by the flow of liquid from the inlet to the outlet, once the liquid such as the infusion solution flows into the cavity, it will remain in the cavity. I have an inconvenience.

SUMMARY OF THE INVENTION An object of the present invention is to eliminate such inconveniences and to provide a connector that does not have a dead space in which a liquid such as an infusion solution stays.

In order to achieve such an object, the connector of the present invention is a connector that is connected in the middle of an infusion line and used for mixed injection into the infusion line, comprising an inflow port through which liquid flows from the infusion line and a liquid that flows into the infusion line. A connector body comprising an outlet for flowing out to an infusion line, a connection space connecting the inlet and the outlet, and a cone-shaped projecting member standing upright in the center of the bottom surface of the connection space, and a disk-shaped member. and a columnar member standing upright at the center of the disk-shaped member, and a columnar member formed along the axial direction of the columnar member, when the columnar member is pressed toward the connection space by the distal end of the syringe barrel. A flexible valve body having a mixed injection port that communicates with the connection space by inserting the conical projection member, and a cover member that covers the flexible valve body and fixes it to the connector body. The flexible valve body bends when the cylindrical member is pressed toward the connection space by the distal end of the injection barrel, and forms the conical shape at the boundary between the disk-shaped member and the cylindrical member. The conical projection member is closely attached to the outer peripheral surface of the projecting member, and the conical projecting member has a plurality of grooves along the axial direction on the outer peripheral surface, and the grooves form a gap with respect to the boundary between the disk-shaped member and the columnar member. characterized by

In the connector of the present invention, since the flexible valve body is composed of the disk-shaped member and the columnar member standing upright at the center of the disk-shaped member, the columnar member is connected by the distal end of the injection barrel. In a state in which the connector body is not pressed in the direction of the space, it is possible to eliminate a hollow portion, which is a dead space in which the liquid such as the infusion solution stays, between the connector body and the connection space portion.

Further, when the columnar member is pressed toward the connection space by the distal end of the injection barrel, the flexible valve body bends and the boundary portion between the discoid member and the columnar member becomes the cone. A dead space can be eliminated by closely contacting the outer peripheral surface of the protruding member. On the other hand, if the boundary between the disk-shaped member and the columnar member is in close contact with the outer peripheral surface of the conical projection member, liquid such as a chemical solution supplied from the co-injection port may not be able to flow into the connection space. Concerned.

However, in the connector of the present invention, the conical projection member inserted into the mixed injection port has a plurality of grooves along the axial direction on the outer peripheral surface, and the grooves form the boundary between the disk-shaped member and the columnar member. form a gap with respect to Therefore, a liquid such as a drug solution supplied from the co-injection port can flow into the connection space through the groove of the conical projection member.

Further, in the connector of the present invention, as described above, when the cylindrical member is pressed toward the connection space by the distal end of the injection barrel and the flexible valve body is bent, one of the disk-shaped members is bent. portion may come into contact with the bottom surface of the connection space portion. When a portion of the disk-shaped member contacts the bottom surface of the connection space, the outlet of the groove of the conical projection member is closed by the disk-shaped member, and the liquid such as the drug solution supplied from the co-injection port flows into the connection space. There is concern that it will not be possible to enter the department.

Therefore, in the connector of the present invention, the flexible valve body is bent when the cylindrical member is pressed toward the connection space by the distal end of the injection barrel, and the connection is made at a portion of the disk-shaped member. The bottom surface of the connection space portion may include a plurality of recesses that are in contact with a portion of the bottom surface of the space portion and that communicate the non-contact portion of the disk-shaped member with the groove portion of the outer peripheral surface of the conical projection member. preferable.

In the connector of the present invention, the connection space has the plurality of recesses on the bottom surface, so that the flexible valve body is bent and a part of the disk-shaped member is used to form a part of the bottom surface of the connection space. When it comes into contact with the portion, the liquid such as the drug solution supplied from the mixed injection port can flow into the connection space portion from the groove portion of the cone-shaped projection member through the concave portion of the bottom surface of the connection space portion.

A perspective view showing one configuration example of the connector of the present invention. II-II line sectional drawing of FIG. FIG. 3 is a cross-sectional view taken along line III-III of FIG. 2; FIG. 4 is an explanatory cross-sectional view showing a state in which the cylindrical member is pressed toward the connection space by the distal end portion of the injection barrel; FIG. 4 is a perspective view showing another configuration example of the connector of the present invention;

Embodiments of the present invention will now be described in more detail with reference to the accompanying drawings.

As shown in FIGS. 1 and 2, the connector 1 of the present embodiment is a medical device that is connected in the middle of an infusion line (not shown) and used for co-injection of drug solutions into the infusion line, and has a disk-shaped connector body. 2 , a flexible valve body 3 , and a cover member 4 that covers the flexible valve body 3 and fixes it to the connector body 2 .

The connector body 2 has an inlet 21 through which liquid flows from an infusion line (not shown), an outlet 22 through which the liquid flows out to the infusion line, and a connection space 23 that connects the inlet 21 and the outlet 22. I have. The inflow port 21 is formed from the side surface of the connector body 2 in the direction normal to the disk, and the outflow port 22 is formed from the side surface of the connector body 2 symmetrical with respect to the inflow port 21 in the direction normal to the disk. there is The connection space portion 23 is formed as a cylindrical space substantially in the center of the connector body 2, and has a conical projecting member 24 standing upright in the direction of the flexible valve body 3 at the center portion of the bottom surface. The conical protruding member 24 has a plurality of grooves 25 along its side surface along the axial direction, and the grooves 25 communicate with a recess 26 formed in the bottom surface of the connection space 23 .

The flexible valve body 3 includes a disk-shaped member 31 that closes the upper portion of the connection space 23 and a columnar member 32 that stands upright at the central portion of the disk-shaped member 31 . The disk-shaped member 31 is fitted inside the annular wall portion 27 formed along the outer peripheral edge of the connector body 2, while the disk-shaped member 31 is formed along the outer peripheral edge of the connection space portion 23 on the bottom surface of the disk-shaped member 31. An annular projection 28 is press-fitted. As a result, the disc-shaped member 31 is securely held between the cover member 4 (the disc-shaped cover portion 41 ) and the annular projection 28 .

In addition, the cylindrical member 32 is provided with a co-injection port 33 along its axial direction. When the mixed injection port 33 is pressed in the direction of the connection space 23 by the distal end portion 5 (see FIG. 4) of the syringe used for mixed injection, the conical protruding member 24 is inserted. Therefore, the disk-shaped member 31 has a guide recess 34 that guides the conical projecting member 24 directly below the co-injection port 33 . The co-injection port 33 is normally closed, and communicates with the connection space 23 to form a co-injection passage when the conical protruding member 24 guided by the guide recess 34 is inserted.

The cover member 4 covers the flexible valve body 3 except for the bottom surface, and includes a disc-shaped cover portion 41 corresponding to the disc-shaped member 31 and a columnar cover portion 42 corresponding to the columnar member 32. there is Further, the outer peripheral surface of the cylindrical cover portion 42 is provided with a male screw portion 43 to which a locking barrel (not shown) of the injection barrel 5 is screwed.

The disk-shaped cover portion 41 has a skirt portion 44 that hangs down from the outer peripheral edge. While being fitted together, an annular protrusion 46 formed on the inner peripheral surface of the skirt portion 44 is engaged with an annular recess provided on the outer peripheral surface of the annular wall portion 27 . As a result, the flexible valve body 3 is fixed by the cover member 4 while closing the connection space 23 of the connector main body 2 , while the cover member 4 itself is also fixed to the connector main body 2 .

When the connector 1 of the present embodiment is connected to the middle of an infusion line (not shown), the cylindrical member 32 of the flexible valve body 3 is not pressed toward the connection space 23 by the distal end portion 5 of the syringe. In this state, a liquid such as an infusion that has flowed from the infusion line through the inflow port 21 passes through both sides of the conical projecting member 24 in the connection space 23 and out of the outflow port 22, as indicated by the arrows in FIG. Outflow into the infusion line. At this time, as shown in FIG. 2, the connection space 23 is closed by the disk-shaped member 31 of the flexible valve body 3, and the infusion solution is placed between the disk-shaped member 31 and the connection space 23, as shown in FIG. Since there is no hollow portion that becomes a dead space in which the liquid such as the infusion stays, the liquid such as the infusion can flow out to the infusion line without remaining.

When co-injecting using the connector 1 connected to the infusion line, as shown in FIG. , and presses the columnar member 32 toward the connecting space portion 23 . In this way, the flexible valve body 3 is bent in a W shape, and the conical protruding member 24 is inserted into the mixed injection port 33 so that the mixed injection port 33 communicates with the connection space 23 to form a mixed injection channel. Form.

At this time, the distal end portion 5 of the injection barrel is supported by the cylindrical cover portion 42 by the inner peripheral surface of the cylindrical cover portion 42 coming into close contact with the outer peripheral surface. Further, when the injection barrel is provided on the outer peripheral side of the distal end portion 5 and has a locking barrel (not shown) having a female threaded portion on the inner peripheral surface, the female threaded portion of the locking barrel can be screwed into the male threaded portion 43 formed on the outer peripheral surface of the cylindrical cover portion 42 . By screwing the female threaded portion of the lock barrel into the male threaded portion 43, the operation of pressing the cylindrical member 31 toward the connecting space portion 23 by the distal end portion 5 of the injection barrel can be easily and reliably performed.

Then, by pushing the plunger of the syringe into the cylinder, the drug solution or the like contained in the syringe is injected from the distal end portion 5 of the syringe into the mixed injection port 33 as indicated by the arrow.

Further, as a result of bending the flexible valve body 3 into a W-shaped cross section as described above, the boundary between the disk-shaped member 31 and the columnar member 32 is brought into close contact with the outer peripheral surface of the conical projecting member 24. ing. At this time, since the conical projecting member 24 has a plurality of grooves 25 along the axial direction on the outer peripheral surface, the grooves 25 form a gap with respect to the boundary between the disk-shaped member 31 and the columnar member 32. can be done. Therefore, a liquid such as a drug solution injected into the mixed injection port 33 can flow into the connection space 23 through the groove 25 of the conical projecting member 24 .

When the flexible valve body 3 is bent and the boundary between the disk-shaped member 31 and the columnar member 32 is brought into close contact with the outer peripheral surface of the conical projecting member 24, the flexible valve body 3 further assumes a disk-like shape as shown in FIG. Part of the member 31 may come into contact with the bottom surface of the connection space portion 23 . When a part of the disk-shaped member 31 contacts the bottom surface of the connection space 23, the outlet of the groove 25 of the conical projection member 24 is blocked by the disk-shaped member 31, and the liquid such as the drug solution supplied from the mixed injection port 33 is connected. There is a concern that it will not be possible to flow into the space 23 .

However, in the connector 1 of this embodiment, the concave portion 26 formed in the bottom surface of the connection space portion 23 is divided into a portion (a non-contact portion of the disk-shaped member 31) with which the disk-shaped member 31 is not in contact, and a conical projection member. 24, the liquid such as the drug solution supplied from the mixed injection port 33 flows from the groove 25 of the conical projection member 24 through the recess 26 of the connection space 23 to the connection space. 23.

On the other hand, a liquid such as an infusion that has flowed into the connection space 23 from the infusion line through the inlet 21 passes through the gap 29 formed between the outer peripheral surface of the bent disc-shaped member 31 and the connection space 23 into a disc shape. It can flow along the outer peripheral surface of the member 31 , and is mixed with a liquid such as a chemical liquid flowing into the connection space 23 through the groove 25 or from the groove 25 through the recess 26 , and is discharged from the outlet 22 . Spill into the infusion line.

Therefore, in the connector 1 of the present embodiment, there is no cavity between the disk-shaped member 31 and the connection space 23, which is a dead space in which the liquid such as the infusion solution stays. A liquid such as a drug solution supplied from 33 can flow out to the infusion line without being retained.

In the connector 1 of the present embodiment, the cover member 4 is mounted on the connector main body 2 by engaging the annular protrusion 46 formed on the inner peripheral surface of the skirt portion 44 with the annular concave portion provided on the outer peripheral surface of the annular wall portion 27 . is fixed to However, the cover member 4 has a plurality of claw members 47 extending further downward from the lower edge of the skirt portion 44 as shown in FIG. It may be fixed to the connector main body 2 by engaging with the groove portion 20 .

Further, in the connector 1 of the present embodiment, the conical projecting member 24 is provided in the central portion of the bottom surface of the connection space portion 23. A pyramid-shaped projection member may be provided.

DESCRIPTION OF SYMBOLS 1... Connector 2... Connector main body 3... Flexible valve body 4... Cover member 5... Tip part of injection cylinder 21... Inlet 22... Outlet 23... Connection space part 24... Conical shape Projection member 25 Groove 26 Recess 31 Disc-shaped member 32 Cylindrical member 33 Mixed injection port.

Claims (2)

A connector that is connected in the middle of an infusion line and used for mixed injection into the infusion line,
an inlet through which the liquid flows from the infusion line, an outlet through which the liquid flows out to the infusion line, a connection space connecting the inlet and the outlet, and an upright position at the center of the bottom surface of the connection space a connector body comprising a cone-shaped projection member for
A disk-shaped member, a columnar member standing upright at the center of the disk-shaped member, and the columnar member formed along the axial direction of the columnar member is pressed toward the connection space by the distal end portion of the injection barrel. a flexible valve body comprising a mixed injection port that communicates with the connection space portion by inserting the cone-shaped projection member when the valve is closed;
a cover member that covers the flexible valve body and fixes it to the connector body,
The flexible valve body bends when the columnar member is pressed toward the connection space by the distal end of the injection barrel, and the conical projection is formed at the boundary between the discoid member and the columnar member. Adheres to the outer peripheral surface of the member,
A connector according to claim 1, wherein said conical projection member has a plurality of grooves along the axial direction on its outer peripheral surface, said grooves forming a gap with respect to a boundary between said disk-shaped member and said columnar member. 2. The connector according to claim 1, wherein the flexible valve body is bent when the cylindrical member is pressed toward the connection space by the distal end of the injection barrel, and the connection is made at a portion of the disk-shaped member. contact with part of the bottom surface of the space,
A connector according to claim 1, wherein a bottom surface of the connection space portion has a plurality of recesses that communicate between the non-contact portion of the disk-shaped member and the groove portion of the outer peripheral surface of the conical projection member.

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