JPH0341718Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to an end cap of a blood circuit. More specifically, the present invention relates to a tip cap that is fitted onto the tip of a blood circuit, such as when priming a dialyzer.

[Prior Art] There are two types of tip caps that have been used in the past: a closed type and an open type. FIG. 10 shows a closed end cap. In the figure, 1 is a main body, and 2 is a cap. The main body 1 consists of a cap fitting part 3 and a blood circuit connecting part 4,
A blood circuit 10 is connected to the connection portion 4 . The bottom of the cap 2 is closed, and when the cap 2 is inserted into the fitting part 3 as shown by the chain line,
The open end of the body 1 is adapted to be sealed.
The cap 2 and the main body 1 are connected by a flexible hinge 5.
are connected with.

FIG. 11 shows an open tip cap. In this type, a projection 6 extending in the axial direction is formed on the inner circumferential surface of the cap 2, so that a gap is created when the cap 2 is inserted into the fitting part 3. The rest of the configuration is substantially the same as the closed tip cap shown in FIG.

[Problems to be Solved by the Invention] However, with the closed type tip cap, there is a problem in that the cap 2 must be removed each time priming is performed, which is time consuming. Furthermore, when high-pressure steam sterilization of the blood circuit is performed, the cap 2 is inserted into the fitting part 3, so the hinge 5 is heat-set in this state, and even if the cap 2 is removed, the cap 2 remains intact. A phenomenon occurs in which it is inserted into the fitting part 3 by itself. If the tip of the blood circuit is sealed during priming, the physiological saline will not flow out, causing problems such as rupture of the blood circuit and leakage of the dialer. Furthermore, during high-pressure steam sterilization, the cap 2 is fused to the fitting portion 3, causing the problem that the cap 2 cannot be removed.

With an open tip cap, it is not necessary to remove the cap 2 during priming, but there is a problem in that leakage of saline cannot be stopped when priming is completed.

In view of the above circumstances, it is an object of the present invention to provide an easy-to-use tip cap that does not have the drawbacks of conventional closed and open types.

[Means for Solving the Problems] In the distal cap of the blood circuit of the present invention, a main body of a cylindrical member and a cap of a bottomed cylindrical member are connected by a flexible hinge, and the main body is attached to the distal end side. The cap is made up of a cap fitting part and a blood circuit connection part on the proximal end side, the cap is made up of a protrusion extending in the axial direction on the inner peripheral surface of the cylindrical part and a stopper formed on the inner surface of the bottom part, and the cap fitting part of the main body is When the cap is shallowly inserted into the fitting part, the protrusion comes into sliding contact with the outer peripheral surface of the fitting part,
A gap is created between the outer periphery of the fitting part and the inner circumferential surface of the cap, so that when the cap is deeply inserted, the plug is inserted into the tip of the fitting part in a fluid-tight manner.

Preferably, protrusions are formed intermittently in the circumferential direction on the outer periphery of the main body, and protrusions are intermittently formed in the circumferential direction at the tip of the cap, and the protrusions on the main body side and the protrusions on the cap side are preferably formed intermittently in the circumferential direction. When the protrusions are brought together, the cap is shallowly inserted into the fitting part of the main body, and when the protrusions are brought together, the cap is fitted deeply into the fitting part of the main body. configured so that

[Example] Next, embodiments of the present invention will be described.

Fig. 1 is a perspective view of a tip cap according to an embodiment of the present invention, and Fig. 2 is a main body 1 shown in Fig. 1.
Figure 3 is a cross-sectional view of the cap 2 shown in Figure 1.
Figure 4 is the front view of cap 2, which is the front view of Figure 3.
5 is an explanatory diagram showing how the tip cap A is used, FIGS. 6 and 7 are perspective views and sectional views of the tip cap with the cap 2 inserted shallowly, and FIGS. 8 and 9 are views of the cap. 2 is a perspective view and a cross-sectional view of the distal end cap in a state in which the tip cap 2 is deeply inserted.

As shown in FIG. 1, the tip cap A of this embodiment has a structure in which a main body 1 and a cap 2 are connected by a hinge 5. As shown in FIG. As shown in FIG. 2, the main body 1 is a cylindrical member having a cap fitting part 3 on the distal end and a blood circuit connecting part 4 on the proximal end. A flange 11 is formed approximately at the center of the main body 1, and the wall surface of the flange 11 and the fitting part 3
Four protrusions 12 are formed between the outer peripheral surface and the outer circumferential surface. These four protrusions 12 have a width slightly narrower than the interval dividing the circumference into eight equal parts on the outer peripheral surface of the fitting part 3, and are provided intermittently at equal intervals. A stepped portion 13 is formed on the inner periphery of the connecting portion 4, into which the end of the blood circuit is tightly inserted (see FIG. 7).

As shown in FIGS. 3 and 4, the cap 2 is a cylindrical member with a bottom, and has a cylindrical portion 15 and a bottom portion 16. Four protrusions 17 are provided at the tip of the cylindrical portion 15 in correspondence with the protrusions 12 of the main body 1, and these protrusions 17 are arranged at intervals that divide the circumference into eight equal parts in the same way as the protrusions 12 of the main body 1. It has a slightly narrow width,
They are formed intermittently at equal intervals. Therefore, this projection 17 and the projection 12 can be inserted into each other. Projections 18 are formed on the inner surface of the protrusion 17 and the inner surface of the cylindrical portion 15. These protrusions 18 are provided corresponding to the protrusions 17, so there are four of them, and they are formed in the axial direction from the tip edge to the bottom. All of the four protrusions 18 are provided axially symmetrically with respect to the central axis of the cap 2, and the distance between the symmetrical protrusions 18, 18 is the outer diameter of the fitting portion 3 of the main body 1. is approximately equal to

If this protrusion 18 is provided from the tip to the bottom of the protrusion 17 as described above, its length will become longer, so even when the cap 2 is shallowly fitted into the fitting part 3, the protrusion 18 will allow the cap to be 2 is preferred because it can be held securely. Note that the protrusion 18 may be provided on the inner surface of the cylindrical portion 15 where the protrusion 17 is not formed.

A plug 21 is formed on the inner surface of the bottom 16 of the cap 2. Although the stopper 21 is ring-shaped in the drawing, it may also be column-shaped. The outer diameter of the plug 21 must be such that it can be tightly inserted into the inner peripheral surface of the fitting part 3 of the main body 1. The outer peripheral surface of the plug body 21 is preferably formed into a tapered shape in order to facilitate insertion into the fitting portion 3 and improve sealing performance.

With the above configuration, when the cap 2 is shallowly inserted into the fitting part of the main body 1 (in this specification, "shallow insertion" refers to insertion to the extent that the plug body 21 is not inserted into the fitting part 3). , there is a gap between the inner circumferential surface of the cap 2 and the outer circumferential surface of the fitting part 3 (i.e., the protrusion 18
When the cap 2 is inserted deeply into the fitting part 3, the stopper 21 is inserted into the fitting part
The fitting part 3 is tightly inserted into the inside of the fitting part 3, and the tip of the fitting part 3 is sealed.

The hinge 5 connects the main body 1 and the cap 2, and has sufficient flexibility so that it can be easily bent or straightened. Therefore, the cap 2 can be easily attached and detached, and the cap 2 will not be lost while being removed.

The tip cap A mentioned above requires flexibility in the hinge, can be integrally molded, and is biocompatible, so it is made of polypropylene, polyethylene, acrylonitrile-butadiene-styrene copolymer, polycarbonate, polyamide, Preferably, synthetic resins such as polyethylene terephthalate are used.

Next, how to use this embodiment will be explained.

FIG. 5 shows a state in which the dialer 31 is primed. In the same figure, 32 is a blood pump, 33 is a saline storage bottle, and 34 is a trap, which are connected to the blood circuit 10 as shown in the figure.
It is connected and located to. The end caps A1 and A2 of this embodiment are connected to both ends of the blood circuit 10, respectively. Further, 35 is a plug clamping the left end portion of the blood circuit 10.

During priming, the tip caps A1 and A2 are inserted shallowly so that physiological saline (hereinafter referred to as saline) leaks. That is, the 6th to 7th
As shown in the figure, the cap 2 is inserted into the fitting part 3 by abutting the protrusion 17 of the cap 2 against the protrusion 12 of the main body 1. In this state, there is a gap between the fitting part 3 and the cylindrical part 15 due to the protrusion 18, so saline saline leaks from there as shown by arrow D.

Therefore, in FIG. 5, when the blood pump 32 is driven, saline flows as shown by arrow B, priming the portion on the right side of the branch point 36 of the blood circuit 10 and the dialyzer 31. After the priming of the right side portion is completed in this way, the tip cap A2 is sealed. The sealing operation and its conditions are shown in FIGS. 8-9. Turn cap 2 to the right (or left) as shown by arrow C and push it in a little in the axial direction, then protrusion 17 and protrusion 1
2 are inserted, and the cap 2 is deeply inserted into the main body 1. At this time, the plug 2 at the bottom of the cap 2
1 is inserted into the tip of the fitting part 3 and is brought into close contact with the fitting part 3.
Therefore, the saline fed through the blood circuit 10 is blocked and does not leak.

After sealing the tip cap A2 as described above, remove the tip cap 35 and close the branch point 36.
Priming the left blood circuit 10 from. After completing the priming, the tip cap A1
Seal it in the same way as before.

Next, the advantages of this embodiment will be explained.

With the tip cap A of this embodiment, it is not necessary to remove the cap 2 each time when priming is performed, which saves time and effort. Even when heat is applied to the hinge 5 during high-pressure steam sterilization and the hinge 5 is heat set, the protrusions 17 and 12 prevent the hinge from being sealed automatically. Furthermore, when the cap 2 is inserted shallowly, the protrusion 18 only contacts the fitting portion 3, so it will not become detached. Furthermore, when the cap is inserted deeply, water leakage from saline can be completely stopped.

[Effects of the invention] The invention is easy to use without requiring much effort, and there is no inconvenience such as unintentional sealing or adhesion, and the reliability in use is extremely high.

[Brief explanation of drawings]

Fig. 1 is a perspective view of a tip cap according to an embodiment of the present invention, and Fig. 2 is a main body 1 shown in Fig. 1.
Figure 3 is a cross-sectional view of the cap 2 shown in Figure 1.
Figure 4 is the front view of cap 2, which is the front view of Figure 3.
5 is an explanatory diagram showing how the tip cap A is used, FIGS. 6 to 7 are a perspective view and a sectional view of the tip cap in a state where the cap 2 is inserted shallowly, and FIGS. FIG. 10 is a perspective view and a sectional view of the tip cap in a state where the cap 2 is deeply inserted, FIG. 10 is a sectional side view of the main part of a conventional closed type tip cap, and FIG. 11 is a perspective view of a conventional open type tip cap. . Main symbols in the drawings: A, A1, A2: tip cap, 1: main body, 2: cap, 3: cap fitting part, 4: blood circuit connection part, 5: hinge, 18: protrusion, 21: plug body.

Claims (1)

[Claims for Utility Model Registration] 1. A main body of a cylindrical member and a cap of a bottomed cylindrical member are connected by a flexible hinge, and the main body connects the cap fitting part on the distal side and the blood on the proximal side. the cap comprises a protrusion extending axially on the inner circumferential surface of the cylindrical portion and a plug formed on the inner surface of the bottom portion, and when the cap is shallowly inserted into the cap fitting portion of the main body, The protrusions slide against the outer circumferential surface of the fitting part, creating a gap between the outer circumference of the fitting part and the inner circumferential surface of the cap, and when the cap is deeply inserted, the plug body is inserted inside the tip of the fitting part. The tip cap of a blood circuit configured to be inserted in a fluid-tight manner. 2 Protrusions are formed intermittently in the circumferential direction on the outer periphery of the main body, and protrusions are intermittently formed in the circumferential direction at the tip of the cap, and the protrusions on the main body side and the protrusions on the cap side are formed intermittently in the circumferential direction. They can be inserted into each other, and when the protrusions are butted together, the cap is shallowly inserted into the fitting part of the main body, and when the protrusions are brought together, the cap is deeply fitted into the fitting part of the main body. The tip cap according to claim 1 of the utility model registration claim, which is constructed as follows.