A surgical instrument with articulated jaw structure includes a frame and two jaws. The jaws have proximal portions that are mounted to each other for movement in a substantially parallel relation between a fully open position wherein the jaws are separated for receiving tissue therebetween and...http://www.google.se/patents/US5749893?utm_source=gb-gplus-sharePatent US5749893 - Surgical instrument having an articulated jaw structure and a detachable knife 
