A surgical instrument including a housing, an endoscopic portion, a drive gear, a drive motor, a shift motor and an end effector is disclosed. The endoscopic portion extends distally from the housing and defines a longitudinal axis. The drive gear is disposed at least partially within the housing and...http://www.google.de/patents/US20080251568?utm_source=gb-gplus-sharePatent US20080251568 - Powered surgical instrument
