JPS6311962Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of a branch part of an extracorporeal circulation circuit, and aims to provide a branch part that can be manufactured without cutting the tube body.

It is well known that circuits for extracorporeal circulation of body fluids are connected to artificial kidneys, artificial livers, plasma separation devices, and other body fluid processing devices.

The tube body of such an extracorporeal circulation circuit is usually provided with a large number of branch parts such as an air line, a mixed injection part, and a heparin line.

For example, Fig. 1 shows a cross-sectional view of a conventional co-injection part, but when assembling such a co-injection part, as shown in Fig. 2, after cutting the tube 1 at the appropriate place, each Apply the solvent 2 to the tip of the tube body 1 and push it into the connecting tube 3 with your fingers. Then, insert the rubber stopper 5 so as to seal the opening 4 of the connecting tube 3. A cover 6 is placed over the top.

However, according to such a method, the diameter of the tube body 1 must be formed to an accurate size so that the tube body 1 and the connecting pipe 3 are compatible, and the tube body 1 must be further precisely cut to a predetermined length. , the tube body 1 has many manufacturing steps, is time-consuming, and has distortions in the cut surface of the tube body 1.
Incompatibility of the connecting pipe 3 and the adhesion roots 7 of the solvent may occur, forming unevenness and causing blood coagulation.
Due to high-pressure steam sterilization after assembly, the connecting part between the tube body 1 and the connecting tube 3 contracts inward, and the diameter of that part becomes slightly smaller or a difference in level occurs, which disrupts the blood flow and prevents blood flow. coagulation and residual blood,
Disadvantages have been pointed out, such as causing hemolysis and having a large number of parts, making parts management complicated.

For this reason, the applicant first filed a U.S. Patent Application in 1983
As No. 170152, we proposed a new branch structure for an extracorporeal circulation circuit. For example, as shown in FIG. 3, this branch part is formed by making a hole 8 in the tube body 1, wrapping and gluing the arm part 10 of the holder 9 around the tube body 1, and forming an insertion hole 11 in the upper part communicating with the hole 8. , and insert the branch tube 12 into the insertion hole 11.
The tip is inserted and glued.

According to such a branch part, each of the above-mentioned drawbacks is improved and it is possible to manufacture a branch part more efficiently than in the past.However, according to subsequent studies, further improvements can be made to this branch part. I found out that there are things I should do.

In other words, with the branch part shown in FIG. 3, the lowermost end of the branch line 12 (or rubber stopper) may protrude too far from the inner surface of the tube body 1 or retract too far in the direction of the insertion hole 11 during installation. Due to this level difference, there is a risk of blood turbulence, blood coagulation, residual blood, hemolysis, etc.
Therefore, great care and skill are required to insert the branch line 12 into the insertion hole 11, and it cannot be denied that work efficiency is reduced.

The present invention has been devised to improve these drawbacks, and its basic feature is that a protrusion is provided on the lower edge of the holder insertion hole.

A specific embodiment of the present invention will be described below. First, FIG. 4 shows a tube main body 3 constituting an extracorporeal circulation circuit.
This tube body 30 is made of vinyl chloride or other soft synthetic resin, and a hole 31 is opened at the side of the tube body 30 at a position where a branch portion is to be provided.

Further, FIG. 5 is a holder according to the present invention, and FIG. 6 is a sectional view thereof taken along line A-A. This holder 20 is composed of a cylindrical portion 21 having a branched joining member insertion hole 23 and a flange portion 22 formed around the cylindrical portion 21. A protrusion 2 is provided at the lower end periphery of the insertion hole 23.
4 is formed.

The shape of the flange portion 22 in the present invention may be any shape such as rectangular, circular, or oval. Further, the flange portion 22 only needs to have a sufficient area to support a branch line 25, which will be described later, and the dimension of the flange portion 12 may be made long so that it can be wrapped around the tube body 30 in the circumferential direction if necessary. . Furthermore, the protrusion 24 is inserted into the insertion hole 2.
It may be formed in the entire circumferential direction of 3 or may be formed partially. The dimension of this protrusion 24 in the protrusion direction is equal to the wall thickness of the tube body 30,
Further, it is desirable that the thickness of the protruding portion 24 be thinner than the wall thickness of the cylindrical portion 21.

The material of the holder 20 may be soft, hard, or semi-hard synthetic resin.

Next, an example of the assembly procedure of the present invention will be described. First, as shown in FIG. and fix it. In this case, the lowermost end of the branch line tube 25 is aligned with the lower end of the projection 24. In addition, when the flange part 22 is hard or semi-hard,
It is heated and softened in advance, or molded into a curved shape to match the outer circumferential curvature of the tube body 30.

Subsequently, after applying a solvent to the back surface of the flange portion 22 of the holder 20 and the outer periphery of the protruding portion 24, the protruding portion 24 is inserted into the hole 31 of the tube body 30, and the holder 20 is fixed to the tube body. .

The assembly procedure described above is merely an example, and any assembly procedure may be used as long as the configuration of the present invention is satisfied. Further, although the above-mentioned embodiment takes the branch line tube 25 as an example, a mixed injection section can also be constructed by inserting a rubber stopper in place of the tube 25 and placing the cap 6 over it.

As explained above, according to the present invention, the protrusion 24 is provided particularly at the lower end periphery of the holder insertion hole, so that the lowermost end of the branch member such as the branch tube or rubber stopper is aligned with the lower end of the protrusion. By simply inserting the branching member into the hole 31 of the main body 30, it is possible to prevent the branch member from protruding too much into the tube main body 30 or retracting the branch member too much into the insertion hole 23.
There is no difference in level on the inner surface of 0. Therefore, it is possible to prevent turbulent flow of blood flowing inside the tube body 30, and to prevent blood coagulation, residual blood, hemolysis, etc.

Furthermore, it is not necessary to align the insertion hole 23 and the hole 31 by simply inserting the protrusion 24 into the hole 31 of the tube body 30.
1, the holder 20 has the advantage that it can be reliably fixed to the tube body 30 without fear of it slipping off, and is a highly practical idea.

[Brief explanation of the drawing]

Figure 1 is a sectional view showing the conventional branch structure;
The figure is a sectional view for explaining the assembly procedure, FIG. 3 is a sectional view showing another conventional branch structure, and FIG. 4 is a conceptual diagram of the tube body for explaining the embodiment of the present invention. FIG. 5 is a plan view of the holder according to the present invention, FIG. 6 is a sectional view taken along line A-A in FIG.
7 and 8 are partial cross-sectional views for explaining the assembly procedure of the branch part of the present invention. In the figure, 20 is a holder, 21 is a cylinder, 22 is a flange, 23 is an insertion hole, 24 is a protrusion, 25 is a branch line tube, 30 is a tube body, and 31 is a hole.

Claims (1)

[Scope of utility model registration request] 1. A branch section of an extracorporeal circulation circuit, comprising a tube main body having a hole opened on the side thereof, and a holder having an insertion hole for a branch joining member, the holder insertion hole having a protrusion at the lower end periphery thereof.