JPH0324192Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a peritoneal dialysis catheter equipped with a cuff member for fixing the catheter in in-vivo tissue.

Peritoneal dialysis is generally performed to treat conditions such as renal failure, but since the treatment period is often long, the peritoneal dialysis catheter used for this is surgically placed in the body. This catheter is fixed by an indwelling technique that forms a tunnel from the epidermis to the peritoneum in the subcutaneous tissue and muscle tissue, but in order to sufficiently fix the catheter in the subcutaneous tissue, etc., this is done through a cuff member. Conventionally, peritoneal dialysis catheters have been made of felt, woven fabrics, etc. made of polyester fibers, etc.
Those equipped with a cuff member such as non-woven fabric are used.

However, with these conventional catheters, the compatibility of the cuff member with the subcutaneous tissue is insufficient, and there is a risk of inflammation within the so-called subcutaneous tunnel created in the subcutaneous tissue during long-term indwelling, and lint and lint may be removed from the cuff member. The fibrous debris, called fibrous debris, is released and migrates through the body tissues and is absorbed into the capillaries, sometimes causing blood clots, so it has not been fully satisfactory as a catheter for peritoneal dialysis.

The present invention has been made to solve the above-mentioned conventional drawbacks, and is a peritoneal dialysis catheter characterized by having a cuff member made of silicone foam.

Next, the present invention will be explained based on one embodiment with reference to the drawings. As shown in Fig. 1, the peritoneal dialysis catheter of the present invention has a small hole 2 for letting dialysate in and out in the part of the catheter body 1 to be indwelled in the peritoneal cavity, and a silicone foam in the part that comes into contact with body tissues. This is a cuff member 3 made of The catheter main body 1 is preferably a flexible tubular material made of plastic, rubber, etc. that does not essentially react with body tissue, and a silicone tube is particularly suitable. The cuff member 3 made of silicone foam is made by bonding a silicone foam formed into a cylindrical shape along the outer periphery of the catheter with an adhesive, or by mixing two components of two-component silicone foam resin. , it can be formed by applying it to the catheter body 1 and then foaming and hardening it. As shown in FIG. 1, this cuff member 3 may consist of a single cylindrical body, which is externally wrapped, or may be one in which two or more short cylindrical bodies are disposed continuously or discontinuously, or it may be made up of two or more short cylindrical bodies that are disposed continuously or discontinuously. A collar may be provided on the epidermal side to improve the fixation of the catheter.

Since the peritoneal dialysis catheter of the present invention is equipped with a cuff member made of silicone foam, there is almost no rejection reaction by living organisms, and it has excellent biocompatibility. Furthermore, since the cuff member is made of foam, it has cushioning properties, so that inflammation due to compression of body tissues is less likely to occur, and secondary infection caused by the inflammation is also almost non-existent. Furthermore, since the surface of the cuff member has a finely uneven shape and granulation easily enters the surface of the cuff member due to cell infiltration, fixation to body tissues is significantly improved. Furthermore, since fiber waste such as lint is not released, it does not cause thrombus.

Note that the cuff member 3 made of the above silicone foam
By attaching amino acid-based biocompatible substances such as collagen, gelatin, and fibrin to the implant, the biocompatibility can be further improved, promoting cell infiltration and fibrosis of granulation, and hastening adhesion and hemostasis after placement. . These amino acid-based biocompatible substances may be attached to the cuff member 3 by coating the surface of the silicone foam, or by chemically bonding them to the silicone foam.

Next, an example of a method for indwelling the peritoneal dialysis catheter of the present invention will be described. FIG. 2 is a sectional view showing how the peritoneal dialysis catheter of the present invention is placed in body tissue. First, from the epidermis A to the subcutaneous tissue B
and the first penetrating through the muscle tissue C to the peritoneum D.
A hole is formed and the catheter is inserted into the hole from the tip. Next, place the epidermis A at a position approximately 5 cm away from the first hole.
2nd hole (not a through hole) leading from to subcutaneous tissue B
form. Then, a subcutaneous tunnel is formed that connects the first hole and the second hole in the subcutaneous tissue, and the part of the catheter that should be left outside the body is pulled out of the body from the second hole through the subcutaneous tunnel.Finally, the epidermal side of the first hole is closed. Suture. As a result, the catheter is indwelled in the body tissue in a bent state as shown in FIG. 2, so that even if it is indwelled for a long period of time, it will not easily come out, increasing safety.

Although the material such as the silicone tube forming the catheter body 1 is flexible, it may spring back at the bent part due to the above-mentioned indwelling method. May cause inflammation. Therefore, as shown in FIG. 3, if the catheter is provided with a bent portion similar to the state in which it is indwelled in the body tissue, such inflammation will not occur. In order to indwell a catheter with a bent part in advance inside the body, when inserting the catheter into the first hole, insert the catheter into a straight shape through a core such as stainless steel wire, and then remove the core to return to its original bent shape. , so it can be easily placed in a stable state.

Another example of the method for indwelling the peritoneal dialysis catheter of the present invention is a method in which the catheter is indwelled in a substantially straight line within a living tissue. With this method, there is no need to create a bent part using a subcutaneous tunnel, etc., and the surgery can be performed easily. However, it is preferable to use a catheter equipped with a cuff member with a brim to improve the fixation of the catheter. .

As described above, the peritoneal dialysis catheter of the present invention has extremely good biocompatibility and excellent fixation properties, so it can be safely used for long-term peritoneal dialysis treatment.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an embodiment of the peritoneal dialysis catheter of the present invention, FIG. 2 is a sectional view showing the indwelling state of the peritoneal dialysis catheter of the present invention, and FIG. 3 is a perspective view showing an embodiment of the peritoneal dialysis catheter of the present invention. FIG. 3 is a perspective view showing another example of a peritoneal dialysis catheter. 1... Catheter body, 2... Small hole, 3... Cuff member made of silicone foam, A... Epidermis, B... Subcutaneous tissue, C... Muscular tissue, D... Peritoneum.

Claims (1)

[Scope of utility model registration request] A peritoneal dialysis catheter in which a cuff member made of silicone foam is externally fixed to a part to be fixed to living tissue.