JP7437602B2 - connector - Google Patents

Description

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

BACKGROUND ART Conventionally, a connector has been known that is connected to the middle of an infusion line and used for mixed injection of a drug solution or the like into the infusion line (see, for example, Patent Document 1).

The connector body includes an inlet through which a liquid such as an infusion flows from an infusion line, an outlet through which the liquid flows out into the infusion line, and a connection space that connects the inlet and the outflow. a flexible bottomed cylindrical member that is connected to the connector body and forms a mixed injection path used for mixed injection into the infusion line; and a cover member that covers the bottomed cylindrical member and is fixed to the connector body. Be prepared.

The bottomed cylindrical member has a hollow portion communicating with the connection space inside, and is connected to the connector body in an inverted state so that the bottom surface is located in a direction away from the connection space. Further, the bottomed cylindrical member has a mixed injection port on the bottom surface, and the mixed injection port communicates with the cavity when pressed in the direction of the connection space by the tip of the syringe barrel used for mixed injection.

JP2004-209278A

In the connector described in Patent Document 1, except when performing co-infusion, liquid such as an infusion that flows from the infusion line through the inlet flows directly from the connection space to the infusion line through the outflow port.

However, since the cavity becomes 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 fluid flows into the cavity, it remains there. There is an inconvenience.

SUMMARY OF THE INVENTION An object of the present invention is to provide a connector that can eliminate such inconveniences and reduce the amount of liquid such as infusion fluid that remains in the cavity.

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, and includes an inlet into which liquid flows from the infusion line, and an inlet into which liquid flows into the infusion line. A connector main body comprising an outflow port that flows into the infusion line, a connection space to which the inflow port and the outflow port are connected, and a connector body that includes a cavity inside that communicates with the connection space, and has a cavity on the bottom surface. an inverted flexible bottomed cylindrical member having a mixed injection port communicating with the connector body; a cover member that exposes the bottom surface of the flexible bottomed cylindrical member while covering the side surface and fixing to the connector body; A partition member is provided upstream of the center of the connection space so as to be connected to the inner circumferential wall of the connection space and partitions the connection space into an upstream side and a downstream side, the partition member being , has a semicircular curved surface that bulges upstream in plan view, the upper part of the partition member is located within the cavity, and the flexible bottomed cylindrical member is located in the connection space. It is characterized in that a gap exists between the inner wall and the bottom surface of the flexible bottomed cylindrical member when the flexible bottomed cylindrical member is pressed in the direction.

In the connector of the present invention, the partition member is erected on the upstream side of the center of the connection space, and the partition member is connected to the inner peripheral wall of the connection space to separate the connection space from the upstream side. It is divided into a downstream side and an upper part thereof is located within the cavity. Therefore, except when performing co-infusion, liquid such as an infusion that flows from the infusion line into the upstream section of the connection space through the inlet is guided to the cavity along the surface of the partition member. .

At this time, since the infusion line is connected to the medicinal liquid bottle on the upstream side, the pressure applied to the liquid such as the infusion is applied by gravity or by the infusion pump. Therefore, since the partition member is provided upstream of the center of the connection space, the liquid such as the infusion is guided into the cavity along the surface of the partition member. The pressure allows it to flow to the top of the cavity. Then, the liquid such as the infusion solution is reversed within the cavity and flows out from the downstream section of the connection space to the infusion line through the outlet.

Therefore, according to the connector of the present invention, the liquid can flow out into the infusion line without remaining in the cavity, which is a dead space in the past.

On the other hand, when performing mixed injection, the flexible bottomed cylindrical member is pressed in the direction of the connection space by the tip of the syringe used for mixed injection, but the partition member Since there is a gap between the inner wall and the bottom surface of the cylindrical member, the liquid such as the infusion solution can flow out from the gap to the downstream side of the partition member.

Since the pressure is applied to the liquid such as the infusion, if the liquid can be made to flow into the cavity while maintaining the pressure as much as possible, the liquid can reach the upper part of the cavity. This is advantageous in that the liquid is allowed to flow into the infusion line without being retained in the cavity.

Moreover, in the connector of the present invention, it is preferable that the inner bottom wall of the connection space is located closer to the cavity than the inlet or the outlet. In the connector of the present invention, by arranging the connection space portion in this way, the relative positional relationship between the mixed injection port, the inflow port, and the outflow port and the shape of the flexible bottomed cylindrical member can be controlled. Without any modification, the volume of the connecting space is reduced to allow the liquid such as the infusion to efficiently flow up to the upper part of the cavity, and to quickly discharge it from the outlet without stagnation in the connecting space. can do.

In the connector of the present invention, an inner bottom wall of the connection space opposite to the cavity is on the same plane as a receiving surface of the connector body with which the open end of the flexible bottomed cylindrical member contacts. It is more preferable that the receiving surface be located on the cavity side than the receiving surface. In the connector of the present invention, by arranging the inner bottom wall of the connection space in this way, the whole of the connection space is overlapped inside the flexible bottomed cylindrical member, and the connection Since the volume of the space can be further reduced, the liquid such as the infusion solution can more efficiently flow into the upper part of the cavity and can be quickly discharged from the outlet.

Moreover, in the connector of the present invention, it is preferable that the partition member has a curved surface that bulges toward the upstream side. In the connector of the present invention, the partition member includes the curved surface, so that when a certain distance is provided between the partition member and the inner circumferential wall on the upstream side of the connection space, the partition on the upstream side of the connection space can be separated. The pressure applied to the liquid such as the infusion solution can be further suppressed from decreasing.

Further, in the connector of the present invention, it is preferable that the partition member includes an extension portion extending upstream at an end portion on a side connected to the inner circumferential wall of the connection space portion. In the connector of the present invention, since the partition member includes the extension part, a section of the connection space upstream of the partition member can be narrowed in the width direction, and the liquid such as the infusion solution can be applied to the connector. It is possible to further suppress the reduction in pressure caused by

By the way, since the upper part of the partition member is located within the cavity, when the flexible bottomed cylindrical member is pressed in the direction of the connection space, the flexible bottomed cylindrical member In order to form a gap between the inner wall and the bottom surface of the connection space, it is necessary to provide a certain distance without being too close to the inner circumferential wall on the upstream side of the connection space. However, when the distance between the partition member and the inner circumferential wall of the connection space is widened, the upstream section of the connection space becomes relatively wide, and the liquid such as the infusion solution flows into the section from the inlet. When this occurs, the pressure may be reduced and it may be difficult for the liquid to reach the top of the cavity.

Therefore, in the connector of the present invention, it is preferable that the partition member has a bulge in the lower part that bulges upstream from the upper part. In the connector of the present invention, the partition member is provided with the bulge at the lower part, so that when the flexible bottomed cylindrical member is pressed, the inner wall and bottom surface of the flexible bottomed cylindrical member Although a gap is formed between them, the upstream section of the connection space can be further narrowed, and a reduction in the pressure applied to the liquid such as the infusion can be suppressed.

Further, in the connector of the present invention, the partition member is provided with a tapered surface that gradually bulges from above to below toward the upstream side instead of the bulge, or on the bulge or above the bulge. It may be equipped with the following. In this case, it is possible to achieve the same or better effects than when only the bulging portion is provided.

Further, in the connector of the present invention, when performing co-injection, the flexible bottomed cylindrical member is pressed toward the connection space by the tip of the syringe barrel, etc., causing compressive deformation. Therefore, in the connector of the present invention, the cover member is provided between the cover member and the flexible bottomed cylindrical member when the flexible bottomed cylindrical member is compressed and deformed when the flexible bottomed cylindrical member is pressed in the direction of the connection space. It is preferable to provide a gap for accommodating the compressed portion of the flexible bottomed cylindrical member.

In the connector of the present invention, by providing the gap between the cover member and the flexible bottomed cylindrical member, the operation of pressing the flexible bottomed cylindrical member toward the connection space portion can be performed. It can be done easily.

Furthermore, 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, and includes an inlet into which liquid flows from the infusion line, and an inlet through which liquid flows out into the infusion line. An inverted flexible bottomed cylindrical connector body comprising a connector main body having an outlet, a cavity inside to which the inlet and the outlet are individually connected, and a co-injection port communicating with the cavity on the bottom surface. a cover member that exposes the bottom surface of the flexible bottomed cylindrical member and covers the side surface and is fixed to the connector body; a partition member provided therein , the partition member including a semicircular curved surface that bulges upstream in plan view; When the flexible bottomed cylindrical member is pressed, a gap may exist between the inner wall and the bottom surface of the flexible bottomed cylindrical member.

In the connector of the present invention, even when the connector main body does not include the connection space and the inflow port and the outflow port are individually connected to the cavity, the connector is provided at a position upstream of the center within the cavity. By providing a partition member in the connection space, the same effect as in the case where a partition member whose upper portion is located inside the outer cavity is provided in the connection space can be achieved.

FIG. 1 is an explanatory cross-sectional view showing one configuration example of the connector of the present invention. FIG. 2 is an explanatory cross-sectional view taken along the line II-II in FIG. 1; FIG. 2 is an explanatory cross-sectional view showing a state in which the flexible bottomed cylindrical member is pressed toward the connection space by the tip of the syringe barrel in the configuration example shown in FIG. 1 . FIG. 7 is an explanatory cross-sectional view showing another configuration example of the connector of the present invention. FIG. 7 is an explanatory cross-sectional view showing another configuration example of the connector of the present invention. FIG. 6 is an explanatory cross-sectional view taken along the line III-III in FIG. 5; FIG. 6 is a plan view of the connector main body in the configuration example of FIG. 5; FIG. 7 is an explanatory cross-sectional view showing another configuration example of the connector of the present invention. FIG. 7 is an explanatory cross-sectional view showing another configuration example of the connector of the present invention.

Next, embodiments of the present invention will be described in more detail with reference to the accompanying drawings.

As shown in FIG. 1, a connector 1 according to the present embodiment is a medical instrument that is connected to an infusion line (not shown) and used for mixed injection of a drug solution into the infusion line. It consists of an inverted, substantially conical flexible bottomed cylindrical member 3 connected to the connector body 2 , and a cover member 4 that covers the flexible bottomed cylindrical member 3 and is fixed to the connector main 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 into the infusion line, and a connection space 23 that connects the inlet 21 and the outlet 22. We are prepared. The inflow port 21 is formed from the side surface of the connector body 2 in the normal direction of the disc, and the outflow port 22 is formed from the side surface of the connector body 2, which is symmetrical to the inflow port 21, in the normal direction of the disc. The inlet 21 and the outlet 22 are arranged in a straight line.

The flexible bottomed cylindrical member 3 includes a cavity 31 that communicates with the connection space 23 inside, and the cavity 31 has a large diameter section 32 that communicates with the connection space 23 and a small diameter section 33 that has a smaller diameter. and a tapered part 34 that gradually reduces in diameter from the large diameter part 32 side toward the small diameter part 33 and connects the large diameter part 32 and the small diameter part 33. Further, the flexible bottomed cylindrical member 3 is connected to the connector main body 2 in an inverted state such that the bottom surface 35 is located in a direction away from the connection space 23 (upward in FIG. 1). is equipped with a mixed injection port 36. The mixed injection port 36 communicates with the small diameter portion 33 when the flexible bottomed cylindrical member 3 is pressed in the direction of the connection space 23 by the tip 5 of the syringe used for mixed injection (see FIG. 3).

The cover member 4 exposes the bottom surface 35 of the flexible bottomed cylindrical member 3 while covering its side surfaces, and corresponds to the hole 41 exposing the bottom surface 35, the large diameter portion 32, and the tapered portion 34. It has a large diameter cover part 42 and a small diameter cover part 43 corresponding to the small diameter part 33 and mixed injection port 36, and the bottom surface of the large diameter cover part 42 is attached to the annular protrusion 24 formed on the upper surface of the connector main body 2 by ultrasonic fusion. By being attached, the flexible bottomed cylindrical member 3 is fixed to the connector main body 2.

The cover member 4 also includes a gap 44 between the large diameter cover portion 42 and the flexible bottomed cylindrical member 3, and a lock barrel (not shown) of the syringe barrel is provided on the outer peripheral surface of the small diameter cover portion 43. It is provided with a male threaded portion 45 to be screwed together. The gap 44 accommodates a portion compressed and deformed when the flexible bottomed cylindrical member 3 is pressed toward the connection space 23 by the tip 5 of the syringe barrel (see FIG. 3).

A partition member 25 is erected in the connection space 23 of the connector body 2 upstream from the center thereof. The partition member 25 divides the connection space 23 into an upstream section 23a and a downstream section 23b, and is provided with a bulge 26 at its lower part that bulges toward the upstream section 23a, and whose upper part is flexible. It is located within the large diameter portion 32 of the bottomed cylindrical member 3. Further, as shown in FIG. 2, the partition member 25 includes a curved surface 27 in the center that is connected to the inner circumferential wall of the connection space 23 at both ends and bulges out in a semicircular shape in a plan view toward the upstream section 23a. ing.

When the connector 1 of this embodiment is connected in the middle of an infusion line (not shown), the infusion liquid or other liquid that has flowed from the infusion line through the inflow port 21 into the upstream section 23a of the connection space 23 is connected to the infusion line (not shown). 1, it is guided into the cavity 31 along the surface of the partition member 25. Here, since the partition member 25 is connected to the inner circumferential wall of the connection space 23 at both ends, the entire amount of liquid such as an infusion that has flowed into the upstream section 23 a is guided to the cavity 31 .

In addition, since the infusion line is connected to a drug bottle on the upstream side, the liquid such as the infusion may be caused by the pressure of gravity due to the height difference between the drug bottle and the connector 1, or the infusion that is connected in the middle of the infusion line. Pressure provided by a pump is applied. Therefore, when the liquid such as the infusion solution is guided into the cavity 31 along the surface of the partition member 25, it can flow up to the upper part of the cavity 31 due to the pressure. The liquid such as the infusion is turned over at the upper part of the cavity 31 and flows out from the outlet 22 to the infusion line, thereby preventing the liquid such as the infusion from remaining in the cavity 31.

On the other hand, since the upper part of the partition member 25 is located within the large diameter portion 32 of the flexible bottomed cylindrical member 3, if the partition member 25 is too close to the inner circumferential wall on the upstream side of the connection space 23, the problem described below will occur. When the flexible bottomed cylindrical member 3 is pressed in the direction of the connection space 23, there is a concern that the upper part may come into contact with the inner wall and bottom surface of the flexible bottomed cylindrical member 3. Therefore, it is necessary to provide a predetermined distance between the partition member 25 and the inner circumferential wall on the upstream side of the connection space 23, but in this case, the pressure of the liquid such as an infusion that has flowed into the upstream section 23a is reduced. When guided into the cavity 31, it may not be able to flow sufficiently to the upper part of the cavity 31.

Therefore, the partition member 25 has a bulge portion 26 at its lower part that bulges toward the upstream section 23a, and further has a curved surface 27 at its center that bulges in a semicircular shape in plan view toward the upstream section 23a. ing. As a result, the partition member 25 can narrow the volume of the upstream section 23a while providing a predetermined distance between the partition member 25 and the inner circumferential wall on the upstream side of the connection space 23. It is possible to suppress the pressure of the liquid from being reduced.

Next, when co-injecting using the connector 1 connected to the infusion line, insert the tip 5 of the syringe barrel containing the drug solution to be co-injected into the hole 41 of the cover member 4, as shown in FIG. , the bottom surface 35 of the flexible bottomed cylindrical member 3 exposed in the hole 41 is pressed toward the connection space 23 of the connector body 2 . In this way, the mixed injection port 36 communicates with the small diameter portion 33 as described above.

At this time, the distal end portion 5 of the syringe barrel is supported by the hole 41 because the inner circumferential surface of the hole 41 is in close contact with the outer circumferential surface. In addition, when the syringe barrel is provided with a lock barrel (not shown) which is an outer barrel provided on the outer peripheral side of the distal end portion 5 and has a female threaded portion formed on the inner peripheral surface, the female threaded portion of the lock barrel can be screwed into a male threaded portion 45 formed on the outer peripheral surface of the small diameter cover portion 43. By screwing the female threaded portion of the lock barrel into the male threaded portion 45, the operation of pressing the bottom surface 35 toward the connection space 23 of the connector body 2 by the tip portion 5 of the syringe barrel can be easily and reliably performed.

Then, by pushing the plunger of the syringe into the cylinder, the drug solution, etc. contained in the syringe is injected from the tip 5 of the syringe into the small diameter portion 33 as shown by the arrow, and is applied to the infusion line. Mixed injection of medical solutions, etc. is performed.

During the co-injection, the flexible bottomed cylindrical member 3 is compressed and deformed by being pressed by the tip 5 of the syringe barrel, but the cover member 4 is compressed and deformed between the flexible bottomed cylindrical member 3 and Since the gap 44 is provided in the gap 44, the compressed and deformed portion can be accommodated in the gap 44, and the operation of pressing the flexible bottomed cylindrical member 3 toward the connection space 23 can be easily performed.

Furthermore, when the flexible bottomed cylindrical member 3 is pressed against the tip 5 of the syringe barrel, there is a narrow gap 28 between the partition member 25 and the inner wall and bottom surface of the flexible bottomed cylindrical member 3. is formed, so that a liquid such as an infusion to which pressure is applied as described above will be ejected from the gap 28 into the downstream section 23b. At this time, since the partition member 25 is located upstream of the center of the connection space 23, the downstream section 23b is relatively wider than the upstream section 23a, and the infusion liquid ejected from the gap 28 After sufficiently mixing the liquid and the medicinal liquid co-injected from the syringe, the liquid can be flowed out from the outlet 22 into the infusion line.

Next, another example of the configuration of the connector 1 will be described. In the following description, the same components as those shown in FIG.

As shown in FIG. 4, the partition member 25 of the connector 1 may include a tapered surface 29 that gradually bulges toward the upstream side from above to below. In this case as well, similarly to the bulging portion 26, it is possible to reduce the volume of the upstream section 23a and suppress a reduction in the pressure of liquid such as an infusion solution flowing into the upstream section 23a.

Although not shown in the drawings, the partition member 25 including the bulging portion 26 may be provided with a tapered surface 29. In this case, the tapered surface 29 may be provided on the bulging portion 26, the tapered surface 29 may be provided above the bulging portion 26, or the tapered surface 29 may be provided on both the bulging portion 26 and its upper portion. A tapered surface 29 may also be provided.

Further, as shown in FIGS. 5 to 7, the connection space 23 of the connector 1 may be arranged offset from the inlet 21 and the outlet 22 toward the cavity 31. In this example, the connection space 23 is formed between the inlet 21 and the outlet 22 in the connector body 2 by partially raising the bottom toward the flexible bottomed cylindrical member 3 side. It is arranged closer to the cavity 31 than 22.

More specifically, the connector main body 2 includes a receiving surface 20 a that is in contact with the open end 37 of the flexible bottomed cylindrical member 3 , and the connector body 2 includes a receiving surface 20 a that is in contact with the open end 37 of the flexible bottomed cylindrical member 3 . The side inner bottom wall 23c is provided so as to be located on the same plane as this receiving surface 20a. That is, the inner bottom wall 23c of the connection space 23 is flush with the receiving surface 20a.

The open end 37 side (connector body 2 side) of the large diameter portion 32 of the flexible bottomed cylindrical member 3 has an inner diameter that is larger overall than the large diameter portion 32 and gradually expands toward the open end 37 side. An enlarged portion 38 having a diameter is provided. Further, the receiving surface 20a of the connector main body 2 is provided with a C-shaped protrusion 20b that is housed in the expanded portion 38 and has a substantially C-shape in plan view. In this example, the inner peripheral surface of this C-shaped protrusion 20b constitutes the inner peripheral wall 23d of the connection space 23, and the entire connection space 23 is inside the flexible bottomed cylindrical member 3. They are arranged in duplicate.

By providing the connection space 23 in this way, the connection space can be formed without changing the relative positional relationship between the mixed injection port 36, the inflow port 21, and the outflow port 22, or the shape of the flexible bottomed cylindrical member 3. The volume of the section 23 can be reduced. This allows the liquid from the inlet 21 to quickly flow into the cavity 31 from the upstream section 23a without deteriorating the usability or manufacturing cost of the connector 1, and allows the liquid to flow into the cavity 31 in areas where stagnation is likely to occur, such as the upper part of the cavity 31. can be reached efficiently. Furthermore, the liquid that has flowed into the downstream section 23b from the cavity 31 can be quickly discharged toward the outlet 22 without being retained.

The inlet 21 and the upstream section 23a of the connection space 23 are connected via the inlet connection passage 21a. The inlet side connection passage 21a has an upstream orthogonal section 21a1 formed in a direction substantially perpendicular to the axis C of the inlet 21 and the outlet 22, and is substantially parallel to the axis C of the inlet 21 and the outlet 22. The downstream side parallel portion 21a2 is formed in the same direction. Further, the cross-sectional shape of the inlet side connection passage 21a is such that the orthogonal portion 21a1 is approximately hexagonal and the parallel portion 21a2 is approximately rectangular.

The upper parts of the orthogonal part 21a1 and the parallel part 21a2 are opened across the receiving surface 20a and the inner bottom wall 23c of the upstream section 23a, and the C-shaped protrusion 20b is cut out at a position corresponding to this opening. It has a substantially C-shape in plan view. Further, the upper opening of the inlet connection passage 21a is partially closed by the open end 37 of the flexible bottomed cylindrical member 3, and the liquid from the inlet 21 flows through the opening in the parallel portion 21a2. It flows into the upstream section 23a through the unblocked portion.

Further, the inlet connection passage 21a is formed to have a smaller cross-sectional area than the inlet 21, so that the liquid flows into the upstream section 23a of the connection space 23 at a relatively high flow rate. Particularly in this example, by making the cross-sectional area of the parallel portion 21a2 on the downstream side smaller than the orthogonal portion 21a1 on the upstream side, the liquid flows more forcefully into the upstream section 23a. Furthermore, in this example, the cross-sectional shape of the orthogonal part 21a1 is configured to have a width that gradually becomes narrower toward the outlet 22 side, so that the liquid flows smoothly from the orthogonal part 21a1 to the parallel part 21a2, This prevents stagnation, etc. from occurring.

The liquid that has flowed into the upstream section 23a of the connection space 23 is guided toward the upper part (bottom surface 35 side) of the cavity 31 by the partition member 25 erected on the inner bottom wall 23c. In this example, the partition member 25 is provided with a curved surface 27 that bulges in a semicircular shape in a plan view toward the upstream section 23a, and both ends (in the width direction) connected to the inner peripheral wall 23d of the connection space 23 are provided. By providing extending portions 25a extending toward the upstream section 23a (both ends), the volume of the upstream section 23a is made smaller. Therefore, the liquid in the upstream section 23a actively flows toward the upper part of the cavity 31.

Further, the inner wall (inner circumferential wall) of the large diameter portion 32 in the hollow portion 31 of the flexible bottomed cylindrical member 3 is configured to be substantially continuous with the inner circumferential wall 23d of the connection space portion 23, and the partition member 25 The portions of both side ends located within the upper large-diameter portion 32 are in contact with the inner wall of the large-diameter portion 32 . The extending portions 25a are also provided at portions located within the large diameter portion 32 at both end portions of the partition member 25.

Therefore, the volume of the section on the lower side of the cavity 31 (on the side of the connector body 2) on the upstream side of the partition member 25 is small, similar to the upstream section 23a of the connection space section 23, and this also allows the liquid to , so as to actively flow toward the upper part of the cavity 31. Furthermore, in this example, the bulging part 26 with the tapered surface 29 is provided at the lower part of the partition member 25, and the upper corner part is not rounded, so that the liquid is more actively directed toward the upper part of the cavity part 31. I try to keep it fluid.

Also in this example, when the flexible bottomed cylindrical member 3 is pressed against the tip 5 of the syringe barrel, the space between the partition member 25 and the inner wall and bottom surface of the flexible bottomed cylindrical member 3 Needless to say, a gap 28 (see FIG. 3) is formed in which the liquid can flow. In addition, as shown in FIG. 7, in this example, appropriate rounding is provided at both ends of the partition member 25 and at the upstream and downstream sides of the portion of the extending portion 25a located within the cavity 31. This prevents local contact or catching of the partition member 25 when the flexible bottomed cylindrical member 3 is deformed.

The downstream section 23b of the connection space 23 and the outlet 22 are connected via the outlet connection passage 22a. The outlet connecting passage 22a is a passage having a substantially rectangular cross section similar to the orthogonal portion 21a1 of the inlet connecting passage 21a, and is formed in a direction substantially perpendicular to the axis C of the inlet 21 and the outlet 22. ing. The outlet connection passage 22a opens at the inner bottom wall 23c on the outlet 22 side in the downstream section 23b, and is formed to have a smaller cross-sectional area than the outlet 22. This provides appropriate resistance to the inflow of liquid from the downstream section 23b to the outlet connection passage 22a, and the liquid flows from the inlet connection passage 21a to the outlet connection passage 22a without passing through the upper part of the cavity 31. The occurrence of flow is now further suppressed.

Further, as shown in FIG. 7, in this example, by smoothly connecting the downstream surface of the partition member 25 and the inner circumferential wall 23d of the downstream section 23b, corners of the downstream section 23b having a relatively large volume are This eliminates the need for stagnation in such corners.

In this way, by providing the partition member 25 and locating the connection space 23 closer to the cavity 31 than the inflow port 21 and the outflow port 22, it is possible to handle infusions, etc. without deteriorating the usability or manufacturing cost of the connector 1. Retention of liquid in the cavity 31 can be more effectively prevented.

Note that the inner bottom wall 23c of the connection space 23 may be provided closer to the cavity 31 than the receiving surface 20a. Depending on the shape of the flexible bottomed cylindrical member 3, the inner bottom wall 23c may be arranged closer to the cavity 31 than the receiving surface 20a to further reduce the volume of the connection space 23. Further, by arranging the inner bottom wall 23c between the receiving surface 20a and the inlet 21 or the outlet 22, and providing a portion in the connection space 23 that does not overlap with the inside of the flexible bottomed cylindrical member 3, the cavity can be The flow state within the portion 31 and the connection space portion 23 may be adjusted.

Furthermore, in the examples shown in FIGS. 5 to 7, the inner bottom wall 23c of the connection space 23 is formed into a plane parallel to the axis C of the inlet 21 and the outlet 22, but the inner bottom wall 23c is It may be a plane inclined with respect to the axis C, or it may be composed of an appropriate curved surface or uneven surface. The flow state within the cavity 31 and the connection space 23 can also be adjusted by appropriately setting the slope, shape, etc. of the inner bottom wall 23c.

Moreover, the inlet side connection passage 21a may include only the orthogonal portion 21a1 and open at the inner bottom wall 23c of the upstream section 23a. Furthermore, the outlet connecting passage 22a may include a portion parallel to the axis C, similar to the inlet connecting passage 21a. Moreover, the cross-sectional shape of the inlet side connection passage 21a and the outlet side connection passage 22a can be any shape, such as a circular shape.

Furthermore, in the examples shown in FIGS. 5 to 7, the bulging portion 26 and tapered surface 29 of the partition member 25 may be omitted, and the curved surface 27 and the extending portion 25a may be omitted. Further, the curved surface 27 may have a shape other than a semicircular shape in plan view and bulge toward the upstream section 23a. Further, the partition member 25 may be configured to have a shape that gives directionality to the flow of the liquid or generates an appropriate vortex, such as by providing the extending portion 25a only at one of the ends.

Furthermore, in this example, the height of the bulge 26 is set to about half the height of the connection space 23, but the bulge 26 may be configured to have the same height as the connection space 23. Alternatively, the upper portion of the bulging portion 26 may be located within the hollow portion 31.

Furthermore, as shown in FIGS. 8 and 9, the connector 1 may not include the connection space 23. That is, the connector 1 may be such that the inlet 21 and the outlet 22 are connected to the cavity 31 without using the connection space 23.

The example shown in FIG. 8 shows a case where the C-shaped protrusion 20b and the connection space 23 are omitted from the examples shown in FIGS. 5 to 7. By omitting the C-shaped protrusion 20b, in this example, the cavity 31 is composed of the expanded portion 38, the large diameter portion 32, the tapered portion 34, and the small diameter portion 33. Further, the inner surface of the receiving surface 20a of the connector body 2 serves as a closing surface 20e that closes the opening of the cavity 31.

The inlet side connection passage 21a is open across the receiving surface 20a and the closing surface 20e, and the liquid from the inlet 21 flows through the portion that is not closed by the open end 37 of the flexible bottomed cylindrical member 3. It flows into the cavity 31 through the hole. Further, the outlet connection passage 22a opens at a position on the outlet 22 side of the closed surface 20e.

The partition member 25 is erected at the same position as the example shown in FIGS. 5 to 7 on the closed surface 20e, and is also located upstream of the center (on the inlet connection passage 21a side) within the cavity 31. . Further, in this example, the entire partition member 25 is located within the cavity 31. Although the shape of the partition member 25 is not particularly limited, it is preferable that the shape is similar to the example shown in FIGS. ) is more preferable. Alternatively, the large diameter portion 32 may be extended to the open end 37 without providing the expanded portion 38 in the flexible bottomed cylindrical member 3.

The example shown in FIG. 9 shows a case where the connection space 23 is omitted by providing a convex portion 20f that is approximately circular in plan view in place of the C-shaped protrusion 20b in the examples shown in FIGS. 5 to 7. There is. The convex portion 20f has a shape that fills the space surrounded by the C-shaped protrusion 20b (that is, the connection space 23) in the examples shown in FIGS. In addition, the top surface serves as a closing surface 20e that closes the opening of the cavity 31.

The inlet connection passage 21a is open across the receiving surface 20a, the side surface of the convex portion 20f, and the closing surface 20e, and the liquid from the inlet 21 is passed through the open end 37 of the flexible bottomed cylindrical member 3. It flows into the cavity 31 through the unblocked portion. Further, the outlet connection passage 22a opens at a position on the outlet 22 side of the closed surface 20e.

The partition member 25 is erected at the same position as the example shown in FIGS. 5 to 7 on the closed surface 20e, and is also located upstream of the center (on the inlet connection passage 21a side) within the cavity 31. . Further, the partition member 25 is entirely located within the cavity 31, similar to the example shown in FIG. Although the shape of the partition member 25 is not particularly limited, it has the same shape as the upper part of the partition member 25 in the examples shown in FIGS. It is preferable that it be in contact with.

In addition, also in the example shown in FIGS. 8 and 9, when the flexible bottomed cylindrical member 3 is pressed by the distal end portion 5 of the syringe barrel, the partition member 25 and the inner wall of the flexible bottomed cylindrical member 3 Needless to say, a gap 28 (see FIG. 3) is formed between the bottom surface and the bottom surface, through which liquid can flow.

In this way, the inlet 21 and the outlet 22 are individually connected to the cavity 31 via the inlet connection passage 21a and the outlet connection passage 22a, respectively, without providing the connection space 23 in the connector body 2. Even in this case, the same effects as in the examples shown in FIGS. 5 to 7 can be achieved.

In addition, also in the example shown in FIGS. 8 and 9, the closing surface 20e may be a plane inclined with respect to the axis C, or may be composed of an appropriate curved surface or uneven surface. In addition, an appropriate route and cross-sectional shape can be adopted as the route and cross-sectional shape of the inlet-side connection passage 21a and the outlet-side connection passage 22a.

Although the embodiments of the present invention have been described above, the connector of the present invention is not limited to the above-described embodiments, and it goes without saying that various changes can be made without departing from the gist of the present invention. It is. For example, the shape and arrangement of each part of the connector 1 is not limited to the shape and arrangement shown in the above embodiment, and various known shapes and arrangement can be adopted.

Further, the inlet 21 and the outlet 22 are not limited to being arranged linearly, but may be arranged so that their axes intersect with each other, for example. Furthermore, the flexible bottomed cylindrical member 3 is not limited to being arranged such that its axis is orthogonal to the axis of the inlet 21 or the outlet 22, and the flexible bottomed cylindrical member 3 is Alternatively, it may be arranged so as to be inclined with respect to the axis of the outlet 22.

Further, in the above embodiment, an example was shown in which a female connector with a female Luer taper and a male thread was provided on the inlet 21 side, and a male connector with only a male Luer taper was provided on the outlet 22 side. A male connector may be provided with a male luer taper and a female thread on the side. Further, the male connector in this case may be provided with a separate member for locking which is provided with a female thread and loosely fitted into the connector main body 2, or the male connector including the male luer taper and the female thread may be provided separately. It may be constructed of a member, fit into the outlet 22 side of the connector main body 2, and arranged so as to be rotatable around the axis C relative to the connector main body 2. It goes without saying that a male connector may be provided on the inlet 21 side and a female connector may be provided on the outlet 22 side.

Further, the functions and effects shown in the above embodiments are merely a list of the most preferable functions and effects resulting from the present invention, and the functions and effects according to the present invention are not limited to these.

DESCRIPTION OF SYMBOLS 1... Connector, 2... Connector main body, 3... Flexible bottomed cylindrical member, 4... Cover member, 5... Tip of syringe barrel, 20a... Receiving surface, 21... Inlet, 22... Outlet, 23... Connection space portion, 23c...Inner bottom wall, 23d...Inner peripheral wall, 25...Partition member, 25a...Extending portion, 26...Bulging portion, 27...Curved surface, 28...Gap, 29...Tapered surface, 31...Cavity portion, 36... Mixed injection port, 37... Open end.

Claims (8)

A connector connected in the middle of an infusion line and used for mixed injection into the infusion line,
a connector body comprising an inlet through which liquid flows from the infusion line, an outlet through which the liquid flows out into the infusion line, and a connection space to which the inlet and the outflow are connected;
an inverted flexible bottomed cylindrical member having a hollow portion communicating with the connecting space inside and a mixed injection port communicating with the hollow portion on the bottom surface;
a cover member that exposes the bottom surface of the flexible bottomed cylindrical member while covering the side surface and fixing to the connector body;
a partition member that is erected upstream from the center of the connection space so as to be connected to the inner circumferential wall of the connection space and partitions the connection space into an upstream side and a downstream side;
The partition member includes a semicircular curved surface that bulges upstream in plan view,
The upper part of the partition member is located within the cavity, and the partition member is configured to prevent the flexible bottomed cylindrical member from moving when the flexible bottomed cylindrical member is pressed toward the connection space. A connector characterized by having a gap between an inner wall and a bottom surface. The connector according to claim 1,
The connector is characterized in that an inner bottom wall of the connection space is located closer to the cavity than the inlet or the outlet. The connector according to claim 1 or 2,
The inner bottom wall of the connection space opposite to the cavity is located on the same plane as the receiving surface of the connector main body that is in contact with the open end of the flexible bottomed cylindrical member, or the receiving surface A connector characterized in that the connector is located closer to the cavity. The connector according to any one of claims 1 to 3 ,
The connector is characterized in that the partition member includes an extension portion extending upstream at an end portion connected to the inner circumferential wall of the connection space portion. The connector according to any one of claims 1 to 4 ,
The connector is characterized in that the partition member includes a bulge in the lower part that bulges upstream from the upper part. The connector according to any one of claims 1 to 5 ,
The connector is characterized in that the partition member includes a tapered surface that gradually bulges toward the upstream side from the top to the bottom. The connector according to any one of claims 1 to 6 ,
The cover member is arranged between the flexible bottomed cylindrical member and the flexible bottomed cylindrical member when the flexible bottomed cylindrical member is compressed and deformed by being pressed in the direction of the connection space. A connector comprising a gap for accommodating a compressively deformed portion of a cylindrical member. A connector connected in the middle of an infusion line and used for mixed injection into the infusion line,
a connector body including an inlet through which liquid flows from the infusion line and an outlet through which liquid flows out into the infusion line;
an inverted flexible bottomed cylindrical member having a cavity inside thereof to which the inlet and the outlet are individually connected, and having a co-injection port communicating with the cavity on the bottom;
a cover member that exposes the bottom surface of the flexible bottomed cylindrical member while covering the side surface and fixing to the connector body;
a partition member erected on the connector body at a position upstream of the center within the cavity,
The partition member includes a semicircular curved surface that bulges upstream in plan view,
The partition member is characterized in that a gap exists between the inner wall and the bottom surface of the flexible bottomed cylindrical member when the flexible bottomed cylindrical member is pressed toward the connector body. connector.

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