JP2002177382A - Balloon cap for dialyzer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a balloon cap for dialyzer which can be manufactured by using a silicone rubber, etc., having superior moldability and a high heat resistance and is excellent in attachability and adhesiveness. SOLUTION: This balloon cap 1 for dialyzer is provided with an outer plug section 3 which has a large thickness and is formed as the peripheral edge section 2 of the opening of an elastic cap fitted to the dialyzate introducing and discharging port 6 of a dialyzer and an inner plug section 7 which is fitted in the port 6 and is formed on the bottom of the recessed section 4 of the elastic cap.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a dialyzer.
The present invention relates to a cap used for (artificial dialysis machine), particularly to a balloon cap for a dialyzer which has a balloon characteristic and is attached to an inlet / outlet of a dialysate.

[0002]

2. Description of the Related Art Conventionally, as a blood purification device for patients with kidney disease,
Blood is passed through a semi-permeable membrane mounted in a cylindrical housing, for example, a hollow fiber, a dialysate is introduced between the hollow fibers from a dialysate inlet provided in the housing, and the blood in the blood is passed through the hollow fiber. A dialyzer is known which purifies blood by transferring waste products into a dialysate and discharging the dialysate from a dialysate outlet.

[0003]

In this dialyzer, after filling sterile water into the inside during the manufacturing process, an elastic cap is attached to the inlet / outlet of the dialysate, and the inlet / outlet of blood is capped. And then the entire dialyzer is wrapped with a packaging film, and then sterilized by heating such as high-pressure steam sterilization.

[0004] Due to the heating in this sterilization treatment, the internal pressure of the dialyzer filled with sterile water rises, and the cap attached to the inlet / outlet of the dialysate falls off or the pressure fluctuations at the time of the fall-off occur. Since a problem such as damage to the hollow fiber in the dialyzer may occur, a balloon cap having balloon characteristics is used for the cap. The balloon cap is inflated like a balloon in response to a rise in internal pressure in the dialyzer generated during heat sterilization such as high-pressure steam sterilization, and has a function of alleviating the rise in internal pressure in the housing.

[0005] As a material of such a balloon cap, for example, silicone rubber, which has a small deterioration in physical properties with respect to a heat treatment such as high-pressure steam sterilization, is preferable. For this reason, there is a problem that aseptic water filled in the dialyzer permeates through the balloon cap and evaporates as time passes, and the amount of sterile water in the dialyzer decreases within the expiration date. Therefore, a balloon cap using butyl rubber having poor gas permeability has been conceived, but has a drawback that heat resistance is poor.

The present invention has been made in view of the above problems, and has been made using a balloon cap for a dialyzer (hereinafter referred to as a dial cap) which can be manufactured using silicone rubber or the like having excellent moldability and heat resistance, and has excellent mounting and sealing properties. , A balloon cap).

[0007]

In order to solve the above-mentioned problems, in the balloon cap of the present invention, the peripheral edge of the opening of the elastic cap attached to the dialysate inlet / outlet provided in the dialyzer is formed thick. An outer cap and an inner cap fitted to the inlet / outlet of the dialysate are provided at the bottom of the concave portion of the elastic cap. With the balloon cap of the present invention having the above configuration, silicone rubber is suitably used.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a schematic view showing an example of the balloon cap of the present invention, wherein (a) is a cross-sectional view,
(B) is a partial cross-sectional view of the state in which the balloon cap of (a) is attached to the introduction / discharge port of the dialyzer. FIG. 2 is a schematic perspective view showing a use state of the balloon cap of FIG. FIG. 3 is a view showing an example of a conventional balloon cap, (a) is a plan view thereof, (b).
3 is a longitudinal sectional view taken along the line AA of FIG.

The balloon cap 1 of the present invention is shown in FIGS.
As shown in FIG.
And an inner plug portion 7 formed at the bottom of the concave portion 4 of the balloon cap 1 and fitted to the inlet / outlet 6 of the dialyzer 5. The outer peripheral portion of the concave portion 4 of the balloon cap 1 The thinner balloon portion 8 is formed. The thick outer plug portion 3 is formed with a projecting annular portion and an outer diameter enlarged portion toward the center of the opening circle of the concave portion 4, and when the balloon cap 1 is attached to the introduction / discharge port 6 of the dialyzer 5. The recess 4 of the balloon cap 1 includes an introduction / discharge port 6, and the inner peripheral surface of the outer plug portion 3 includes the introduction / discharge port 6.
Of the dialyzer 5 is sealed by press-fitting the outer peripheral surface [FIG. 1 (b)].

The inner plug portion 7 is formed in a cylindrical shape so as to protrude from the bottom of the concave portion 4 of the balloon cap 1 so that it can be inserted and fitted into the introduction / discharge port 6 of the dialyzer 5. Furthermore, the peripheral surface 9 on the tip end side of the cylindrical inner plug portion 7.
Is chamfered so as to be easily inserted into the introduction / discharge port 7 of the dialyzer 5, and a concave portion 10 is provided on the top surface.

In the drawings, the inner plug 7 has a cylindrical shape. However, the present invention is not limited to this. A thing may be adopted.

The material of the balloon cap of the present invention is most preferably silicone rubber having excellent moldability and heat resistance, but is not limited to this. Any elastic rubber-like material having excellent moldability and heat resistance can be used.

When the balloon cap 1 of the present invention is attached to the dialyzer inlet / outlet 6 of the dialyzer 5 and the dialyzer 5 is sterilized by heating such as high-pressure steam sterilization, the internal pressure in the dialyzer 5 increases. At the same time, the balloon portion 8 of the balloon cap 1 is inflated like a balloon. Thereby, the internal pressure in the dialyzer 5 is released, and the increase in the internal pressure is reduced.

After the sterilization by heating is completed and the internal pressure in the dialyzer 5 is reduced, the inlet / outlet of the dialysate is sealed with an internal stopper. Thus, after the end of the sterilization process,
In addition to the balloon cap 1 sealing the inlet / outlet 6 from the outside in an enclosing manner, the inner plug portion 7 is fitted and sealed inside the inlet / outlet 6, and furthermore, the water vapor transmission as the inner plug portion is achieved. Since the portion is thick, the sterile water in the dialyzer is less likely to decrease due to evaporation.

[0015]

Hereinafter, embodiments of the present invention will be described.
The present invention is not limited to this. [Example] JIS K 6253 Durometer type A hardness 3
A balloon cap having the shape shown in FIG. 1 was produced by a molding die using a silicone rubber material having 0 degrees and an elongation of 900%.

Comparative Example The same JIS K 6253 durometer type A balloon as in the example having a hardness of 30 degrees and a silicone rubber material having an elongation of 900% was formed by a molding die without an inner plug portion as shown in FIG. A cap was made. [Reference example] JIS K 6253 Durometer type A hardness 3
A balloon cap having a shape shown in FIG. 3 was produced by a molding die using a butyl rubber material having 0 degree and elongation of 900%.

[Measurement of Water Evaporation Amount] The balloon caps obtained in Examples, Comparative Examples and Reference Examples were respectively attached to dialysate inlet / outlet ports of a dialyzer filled with sterile water, and were placed in a 60 ° C. oven. For 60 days, and the amount of water evaporation in the dialyzer was measured from the change in weight of the dialyzer. The balloon cap obtained in the example was almost equivalent to the water evaporation of the butyl rubber balloon cap of the reference example, but the water evaporation of the balloon cap of the comparative example was about twice as high (see Table 1). .

[0018]

[Table 1]

[0019]

According to the present invention, it is possible to provide a balloon cap which can be formed easily and uses silicone rubber excellent in heat resistance to suppress the amount of water evaporation in a sealed dialyzer to the same level as butyl rubber.

[Brief description of the drawings]

FIG. 1 is a schematic view showing an example of a balloon cap of the present invention, in which (a) is a cross-sectional view, and (b) is a partial cross-section in a state where the balloon cap of (a) is attached to an inlet / outlet of a dialyzer. FIG.

FIG. 2 is a schematic perspective view showing a use state of the balloon cap of FIG. 1.

FIG. 3 is a view showing an example of a conventional balloon cap, in which (a) is a plan view thereof, and (b) is a longitudinal sectional view taken along line AA of FIG.

[Explanation of symbols]

 1 balloon cap 2 opening peripheral part 3 outer plug part 4 concave part 5 dialyzer 6 introduction / discharge port 7 inner plug part 8 balloon part 9 peripheral surface of the tip part side of inner plug part

Claims (2)

[Claims] 1. An elastic cap attached to a dialyzer inlet / outlet provided in a dialyzer, said elastic cap comprising an outer plug having a thicker peripheral portion of an opening thereof; A balloon cap for a dialyzer comprising: a bottom portion of the concave portion; 2. The balloon cap for a dialyzer according to claim 1, wherein the elastic cap is made of silicone rubber.