JPH04200566A - Blood circuit branching pipe device - Google Patents

Abstract

PURPOSE:To obtain the blood circuit branching pipe device which has excellent setup workability and sealability, and facilitates the operation for insertion of a needle body by providing a cap body having a shape complying with the shape of the hole part of a branch flow passage and a tapered part which comes into tight contact with the tapered hole part provided at the end of this cap body on the cap body. CONSTITUTION:The cap body 5 has a cap body 5A which comes into pressurized contact with the entire inside periphery of the hole part 6 of the branch flow passage 11 in a part of the inside wall part thereof and the tapered part 5C which comes into tight contact with the tapered hole part 7 provided at the projecting end of this cap body 5A. The shape of the section of this cap body orthogonal with the axial line of the branch flow passage 11 is circular. If such cap body 5 is fitted into the branch flow passage 11, the entire part of the outer periphery of the cap body fits tightly to the inner peripheral surface of the hole part and, therefore, the good sealability is obtd. The tapered part 5C of the cap body 5 comes into contact with the tapered hole part 7 communicating with the hole part 6 and the flow passage 10 in tight contact therewith and, therefore, acts as the stopper of the cap body 5, thereby improving the setup workability of the cap body 5. The tapered hole part 7 functions also as a guide at the time of inserting the needle body for injection of liquid chemicals into the body 5A and the operation for inserting the needle body is facilitated.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a blood circuit branch pipe device, and more particularly to a blood circuit branch pipe device used for branching a blood circuit in an artificial dialysis machine or the like.

[Prior Art] Conventional examples of this type of blood circuit branch tube device are shown in FIGS. 4 and 5.
This will be explained with reference to the figures.

The blood circuit branch pipe device 30 shown in FIG. 4 includes an inlet pipe part 32 and an outlet pipe part 33 forming a linear blood flow path 31.
a branch pipe section 35 forming a branch flow passage 34 with a stepped section 40 that communicates with the flow passage 31 in an intersecting arrangement; At the same time, a lid body 37 with a collar 37B made of rubber, for example, through which a needle bar 36 for drug injection can be inserted, and this lid body 3
The outer cover 38 is provided on the outer periphery of the collar 37B of No. 7 and the outer periphery of the branch pipe portion 35. An insertion hole 39 for the needle bar 36 is formed in a portion of the outer lid 38 that contacts the collar 37B.

Note that the portion of the branch flow passage 34 that communicates with the flow passage 31 has a smaller diameter than the portion where the lid 37 is fitted by the step portion 40;
serves as a stopper for the lid 37.

Since the blood circuit branch pipe device 30 having such a configuration is provided with the stepped portion 40, the fitting position of the lid body 37 with respect to the branch flow passage 34 is a fixed position, and the sealing performance by the lid body 37 is good. It is.

The blood circuit branch tube device M30A shown in FIG. 5 has approximately the same configuration as the blood circuit branch tube device 30 described above, but a tapered branch flow passage 34A is provided throughout. A lid body 37A having a tapered outer peripheral portion
This is different from the blood circuit branch pipe device 30 in that it uses the following.

According to this blood circuit branch pipe device 30A, since the bottom of the lid 37A directly faces the flow passage 31, no air pocket is generated between the flow passage 31 and the branch flow passage 34A, and the branch flow passage Since 34A is tapered, the diameter of the insertion hole 39 can be increased, and the operation of inserting the needle bar 36 into the lid 37A becomes easy.

[Problems to be Solved by the Invention] However, the conventional blood circuit branch pipe device 30 described above
In this case, since the stepped portion 40 is present, there is a high risk that the needle bar 36 will pierce this stepped portion 40, and in order to prevent this, the diameter of the insertion hole 39 of the outer cover 38 must be made small. There is a problem that such restrictions arise.

In addition, in the case of the blood circuit branch tube device 30A, since there is no element such as the stepped portion 40 that exerts a stopper function, the overall dimensions of the lid 37A are adjusted to improve the sealing performance. As a result, when the lid body 37A is inserted into the branch flow passage 34A, the repulsion force becomes large and the installation workability deteriorates.Moreover, when steam sterilization is performed, There is a problem that the lid body 37A contracts and the sealing performance deteriorates.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a blood circuit branching pipe device that is excellent in installation workability and sealing performance, and also allows easy insertion of a needle bar.

[Means for Solving the Problems] A blood circuit branch tube device of the present invention for solving the above-mentioned problems includes an inlet pipe section and an outlet pipe section that form a linear blood flow path, and a blood circuit branch pipe section that crosses the flow path. A blood circuit branch pipe having a branch pipe part forming a branch flow passage that communicates with the arrangement, and a lid body attached to the branch pipe part to block the branch flow passage and into which a needle bar for injecting a drug solution can be inserted. In the device, the branch flow passage of the branch pipe section includes a hole that is opened inward from an outer end of the branch pipe section and has a peripheral wall surface parallel to the axis of the branch pipe section; and a tapered hole communicating with the flow path.

2. The attached body includes a lid main body having a shape similar to the hole of the branch flow passage, and a tapered portion provided at an end of the lid main body and in close contact with the tapered hole. 1) As an embodiment of the lid main body, there can be mentioned a lid main body having an annular protrusion on the circumferential side that presses into contact with the entire inner periphery of a part of the inner wall of the hole of the branch flow passage (claim 2
), Examples of the hole portion of the branch flow passage include a hole portion whose cross-sectional shape perpendicular to the axis of the branch pipe portion is any one of circular, elliptical, cocoon-shaped, and rectangular (Claim 3).
).

[Effect] The operation of the blood circuit branch pipe device described above will be explained below.

When the lid of this blood circuit branch tube device is fitted into the branch flow path, the entire outer circumferential surface of the lid main body comes into close contact with the inner peripheral surface of the hole, resulting in good sealing performance. When an annular protrusion is provided on the outer circumferential surface of the lid main body, which presses into contact with the entire inner periphery of a part of the inner wall of the hole of the branch flow passage, the annular protrusion provided on the lid main body can be provided on the outer circumferential surface of the branch pipe portion. A portion of the inner wall of the hole formed inward from the outer end comes into pressure contact with the entire inner periphery of the hole. Therefore, since the lid body only applies partial surface pressure to the hole, there is less repulsive force during assembly and the sealing performance is even better. In addition, since the tapered part of the lid is in close contact with the tapered hole that communicates the hole and the flow path, the tapered part functions as a stopper, which improves assembly workability and allows for the injection of chemical liquids. It also functions as a guide when inserting the needle bar, making it easier to insert the needle.

The cross-sectional shape of the hole section perpendicular to the axis of the branch pipe section may be circular, elliptical, cocoon-shaped, or rectangular.

[Embodiments] Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 to 3.

The blood circuit branch tube device 1 shown in FIG. 1 includes an inlet tube section 2 and an outlet tube section 3 that form a linear blood flow path 10, and a branch flow path 11 that communicates with the flow path 10 in an intersecting arrangement. a branch pipe section 4 to be formed; a rubber lid 5 that is attached to the branch pipe section 4 to close off the branch flow passage 11 (see Fig. 2) and into which a needle bar 36 for drug injection can be inserted; , and an outer fi 38 that is covered around the outer periphery of the lid body 5 and the outer periphery of the branch pipe section 4.

As shown in FIG. 2, the branch flow path 11 of the branch pipe section 4 communicates a hole 6 extending inward from the outer end of the branch pipe section 4, and this hole 6 and the flow path 10. The tapered hole portion 7 is formed by the tapered hole portion 7.

The hole 6 has a circular cross section perpendicular to the axis of the branch flow passage 11 (which is also the axis of the hole 6).

As shown in FIG. 3, the lid 5 has, for example, two annular protrusions 5B on the outer periphery, which press and contact the entire inner periphery of a part of the inner wall of the hole 6 of the branch flow passage 11. The lid main body 5A is provided at a protruding end portion of the lid main body 5A, and a tapered portion 5C is provided in close contact with the tapered hole portion 7 provided at the protruding end portion of the lid main body 5A. The shape of the cross section of this lid body perpendicular to the axis of the branched flow passage 11 (which is also the axis of the hole 6) is circular.

Note that the upper end of the lid 5 has a flange 5D similar to the conventional example.
is provided.

The annular protrusion 5B has a radius of about 0 to 1.5 mm, a protrusion dimension of about 0 to 0.3 mm, and an outer peripheral shape having an arcuate cross section.

According to the blood circuit branch tube device 1 having the above-described configuration, when the lid body 5 is fitted into the branch flow passage 11, the annular protrusion 5B provided on the lid body 5A extends from the outer end of the branch tube portion 4. A part of the inner wall of the hole 6 formed inwardly comes into pressure contact with the entire inner periphery thereof. As a result, the lid body 5A only applies a partial surface pressure to the hole 6, so that the repulsive force when the lid body 5 is assembled into the branch flow passage 11 can be minimized. Lid body 5
The sealing properties are good.

Further, the tapered portion 5C of the lid 5 is in close contact with the tapered hole 7 that communicates the hole 6 and the flow path 10, so it functions as a stopper for the lid 5, and thereby the lid The workability of assembling the body 5 is improved.

Further, the tapered hole portion 7 also functions as a guide when inserting the needle bar 36 for drug injection into the lid main body 5A, making the operation of inserting the needle bar 36 easier.

In addition to the embodiments described above, the present invention can be modified in various ways within the scope of its gist.

For example, the annular protrusion 5B can be provided in two strips as described above, or in an arbitrary number such as one strip or three strips.

Further, in the above embodiment, the hole has a circular cross section perpendicular to the axis and an equal diameter inner circumferential surface, but this cross section may be oval, cocoon-shaped, or rectangular as necessary. good.

[Effects of the Invention] According to the present invention described in detail above, with the above-described configuration, the ease of assembly can be improved by the tapered hole provided in the branch flow passage and the tapered portion provided in the lid body. In addition, the present invention provides a blood circuit branch tube device that has excellent sealing performance due to the annular protrusion provided on the lid body, and which also facilitates the insertion of a needle bar due to the tapered hole provided in the branch flow path. can do.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of an embodiment of the device of the present invention, FIG. 2 is a sectional view of the branch pipe portion of the device, and FIG. 3 is a side view of the lid of the device.
FIG. 4 is a sectional view showing an example of a conventional blood circuit branch tube device, and FIG. S is a sectional view showing the other side of the conventional blood circuit branch tube device. 1--Blood circuit branch pipe device, 2--Inlet pipe section, 3--Outlet pipe section, 4--Branch pipe section, 5-- ...Lid body, 5A--...Lid body. 5B---Tapered part, 5B---Annular protrusion, 6---Hole, 7Tapered hole, 1
0...Flow path, 11...Branch flow path. Figure 4 Figure 5 Procedural amendment (force type) % type %, Name of the invention Blood circuit branch tube device 3, Person making the amendment Relationship to the case Patent applicant address 3-43-2 Ebisu, Shibuya-ku, Tokyo 4,
Agent address: 6th floor, Hinase Hill, 7-18-20 Nishi-Shinjuku, Shinjuku-ku, Tokyo -9z-Telephone: 03-3
361-2738 - Two Names Patent Attorney (
3759) Naoki Fukumura - Engraving of the drawing originally attached to the application form, as shown in the attached sheet (no changes to the content)

Claims (3)

[Claims] (1) An inlet pipe part and an outlet pipe part that form a linear blood flow path, a branch pipe part that forms a branch flow path that communicates with the flow path in an intersecting arrangement, and a branch pipe part that is attached to the branch pipe part and that In a blood circuit branch tube device having a cover body that blocks a branch flow passage and allows a needle for drug injection to be inserted therein, the branch flow passage of the branch tube portion extends inward from an outer end of the branch tube portion. a hole opening toward the branch pipe and having a circumferential wall surface parallel to the axis of the branch pipe, and a tapered hole communicating the hole with the flow passage; 1. A blood circuit branch tube device comprising: a lid body shaped like a hole in a blood circuit; and a tapered portion provided at an end of the lid body and in close contact with the tapered hole. (2) In claim 1, the lid body has an annular protrusion on the lid body that presses into contact with the entire inner periphery of a part of the inner wall of the hole of the branch flow passage. Blood circuit branch tube device described in. (3) The blood circuit branch tube according to claim 1, wherein the hole has a cross-sectional shape perpendicular to the axis of the branch tube section that is one of circular, elliptical, cocoon-shaped, and square. Device.