A handle assembly for a medical instrument having at least one member moveable in at least a first direction against a first bias and a second direction against a second bias stronger than the first bias, includes a housing, a trigger operatively associated with the at least one member and pivotably...http://www.google.fr/patents/US5976160?utm_source=gb-gplus-shareBrevet US5976160 - Handle mechanism with two distinct pivot points
