[Embolus formation using bismuth polyurethane for tubosterilization observation of 259 cases]

A 50% solution of bismuth polyurethane in absolute alcohol, which remains in a liquid state at 70 degrees C and solidifies at body temperature within a few minutes, was used to form embolus in the fallopian tubes for the purpose of tube-sterilization. This compound is non-caustic and proves to be bioadaptable. A modified Foley's catheter was used to introduce the solution into the lumens of the tube by way of the uterine cavity in 259 cases. A 24 month follow-up by life table method was carried out, and 26 were pregnant with a pregnancy rate of 10.0%. The number of successful operation at the first attempt was 234 with 18 cases pregnant (7.7%). The recanalization rate of the tubes within 24 months was 11.4% including those of pregnancy. There was little side reactions postoperatively. A polyethylene 2 way tube with a rubber bulb for instillation of the bismuth polyurethane had been made on October 1990. Ways of improving the successful rate were mentioned. The authors believe that this is a useful procedure of tubo-sterilization, which is easily accepted by the patients and easily carried out by the medical personnel.