A surgical stapler has a handle assembly including a stationary handle and a trigger. The stapler also has a drive assembly with a body having a working end and a cam member supported on the working end. The cam member is positioned to translate relative to the anvil to maintain the anvil in the closed...http://www.google.com/patents/US7909221?utm_source=gb-gplus-sharePatent US7909221 - Battery powered surgical instrument
