In apparatus for applying a two-part surgical fastener including a fastener part having at least one prong and a retainer part having an aperture for receiving and retaining the distal end of the prong, the retainer part is initially held securely to the apparatus by contact with a lug extending into...http://www.google.de/patents/US4506670?utm_source=gb-gplus-sharePatent US4506670 - Two-part surgical fastener applying apparatus with frangible member
