JPS6152710B2 - - Google Patents

Description

[Detailed Description of the Invention] Tubular organs include, for example, bile ducts, digestive tracts, ureters, blood vessels, etc., and when performing surgery for lesions or injuries, they are often constructed in a T-shape or Y-shape consisting of a horizontal axis and a vertical tube. In some cases, a drain tube is used, and the horizontal tube is placed in a tubular organ, and the vertical tube is percutaneously pulled out of the body through the abdominal cavity or the like. In particular, T-shaped drain tubes made of natural rubber have been widely used to prevent biliary tract injuries, cholelithiasis, urinary tract stones, and their tumors and strictures. However, natural rubber tubes can swell with bile in the biliary tract, and urinary stones may deposit in the urinary tract, causing problems, so silicone rubber tubes are said to be preferable. There are also examples where

Silicone rubber tubes have a small tissue reaction and do not deteriorate even if kept in the body for a long time, so they are used as many in-vivo implants, but after being used for surgery, the T-shaped drain tube is removed as the treatment progresses. In this case, the formation of a fistula between the biliary tract and the skin was weak, and upon removal, there was a risk that bile would sometimes leak into the abdominal cavity, causing severe biliary panperitonitis. This fistula formation occurs because the tissue reaction of the silicone tube that penetrates the abdominal cavity is weak.
This is thought to be due to the fact that the body's protective action is weak, making it difficult for the fistula tissue surrounding the tube to form.

The present invention provides a percutaneous drainage tube for tubular organs which does not have the above-mentioned disadvantages, and will be described in detail below with reference to the accompanying drawings.

FIG. 1 shows a T-shaped tube as an example of the drain tube of the present invention, where 1 is a vertical tube and 2 is an axial tube. The horizontal tube 2 is made of silicone rubber, and the vertical tube 1 is made of silicone rubber whose outer surface is tightly coated with water-insoluble, non-toxic inorganic fine powder 1a, as shown in FIG. The silicone rubber used is one commonly used in the medical field, whose main component is polydimethylsiloxane and which contains silica, diatomaceous earth, etc. as reinforcing agents. Inorganic fine powders include calcium salts, alumina, aluminum salts, aluminates, silica, calcium silicate, salts mainly composed of aluminum, such as calcium carbonate, alumina, silica, clay, tantalum, silver, tungsten, etc. can be mentioned.

When making a drain tube, the method of coating a vertical silicone tube with inorganic fine powder is to directly coat the tube from an extruder when extruding the vertical tube and to combine both the vertical and horizontal tubes into one body. It is convenient to coat and immediately vulcanize, but after applying room-temperature vulcanizable silicone rubber liquid to a molded product that has been integrally molded and vulcanized using a core and split mold, powder is sprinkled on this. The same product can be obtained by vulcanization. The vulcanization method may be an addition type polymerization reaction or a condensation type vulcanization method. Further, in order to make the tube part X-ray contrast sensitive, about 5 to 30% of barium sulfate or metal powder such as tantalum, silver, tungsten, etc. may be added to the polydimethylsiloxane.

According to the drain tube of the present invention, when it is used for surgery on tubular organs and removed, fistula formation is strong. It seems to be triggered.

Example 1 The outer surface of the vertical axis of a silicone rubber T-shaped drain tube molded using a T-shaped mold was thinly coated with room temperature vulcanizable silicone rubber liquid using a brush, and then calcium carbonate fine powder was applied to this. Using a drain tube obtained by leaving it indoors for 72 hours after spraying, the horizontal tube was placed in the bile duct of Yong Chengda, and the vertical tube was removed from the abdominal wall after 10 days. When the bile was injected through the fistula, there was no evidence that a fistula was formed and bile leaked into the abdominal cavity.

Example 2 Silicone rubber with a hardness of 50 that undergoes addition-type polymerization vulcanization is extruded in advance into a tube using an extruder, and immediately after the head die of the extruder, fine alumina powder is sprinkled on the tube to coat it, and then it is immediately primary-treated in a tunnel furnace. Vulcanization was performed, and the product was then subjected to secondary vulcanization at 200° C. for 2 hours and used as a vertical tube, which was then bonded to a horizontal tube with a silicone rubber adhesive to obtain a T-shaped drain tube. Wash and sterilize this, and take care to remove the horizontal tube from the biliary tract of a patient with cholelithiasis.
The vertical tube penetrated the abdominal cavity and was brought out of the skin. Postoperative drainage was uneventful, and the drain tube was removed 3 weeks after treatment of the residual stone. During that time, no abnormalities were found in the affected area, and fistula formation was detected by X-ray contrast medium immediately after removal, and the affected area subsequently recovered smoothly.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing an example of the drain tube of the present invention, and FIG. 2 is an enlarged sectional view taken along line A--A. 1... Vertical axis tube, 1a... Inorganic fine powder, 2
...Horizontal axis tube.

Claims (1)

[Claims] 1. A branched drain tube consisting of a vertical tube and a horizontal tube, characterized in that the horizontal tube is made of silicone rubber, and the vertical tube is made of silicone rubber coated with water-insoluble inorganic fine powder. Percutaneous drainage tube for tubular organs.