A surgical instrument includes an E-beam firing bar engages the channel and selectively engages the anvil during distal firing movements, wherein the tissue is severed and stapled driven upward from the staple cartridge to form against the anvil. In particular, a wedge integral to the staple cartridge...http://www.google.de/patents/US7641093?utm_source=gb-gplus-sharePatent US7641093 - Surgical stapling instrument having an electroactive polymer actuated single lockout mechanism for prevention of firing
