A surgical stapler for implanting and clinching staples in the body of a patient employs a reciprocally movable, retractable anvil and a reciprocally movable former for forming a staple about the end of the retractable anvil. A toggle is mounted in a stapler trigger which simultaneously actuates the...http://www.google.de/patents/US4558810?utm_source=gb-gplus-sharePatent US4558810 - Surgical stapler construction
