An instrument for performing a surgical procedure includes a housing, an elongate shaft having a proximal end mounted by the housing and a distal end with a peripheral edge, a first end effector assembly protruding from the distal end of the elongate shaft and having an end effector at a distal end,...http://www.google.se/patents/US5954731?utm_source=gb-gplus-sharePatent US5954731 - Surgical instrument with multiple rotatably mounted spreadable end effectors
