A surgical instrument includes a surgical end effector having at least one actuation assembly to effect a surgical procedure when actuated, an electric motor operationally connected to the end effector to operate the at least one actuation assembly, and a power supply electrically connected to the motor...http://www.google.com/patents/US20070270784?utm_source=gb-gplus-sharePatent US20070270784 - Electric surgical instrument with optimized power supply and drive
