Apparatus for accomplishing the permanent placement of a lockable clip around a target vessel to interrupt the continuity of the same in a rapid, safe and minimally invasive manner. The apparatus includes a trocar obturator and a hollow member in which the open locking clip is enclosed for delivery to...http://www.google.com.tw/patents/US4877028?utm_source=gb-gplus-share專利 US4877028 - Apparatus for effecting occlusion of the vas deferens
