| 摘要 |
Conception is prevented in male mammals by making an incision (11) in one wall of the vas deferens (10) near the epididymis and inserting a filament (20) into the vas deferens through the incision. The filament has a length at least about one-fourth the length of the vas deferens and an outside diameter about equal to the inside diameter of the vas deferens. It contains an enlargement (21-22-23) at one end and is made of a material inert to tissue. The filament is inserted into the vas deferens all the way to the enlargement. The incision remains open around the filament to permit sperm to escape from the vas deferens.
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