An electro-mechanical surgical device includes: a housing; an elongated shaft extending from the housing, a distal end of the elongated shaft being detachably coupleable to a surgical instrument; at least two axially rotatable drive shafts disposed within the elongated shaft, a distal end of each of...http://www.google.com/patents/US6981941?utm_source=gb-gplus-sharePatent US6981941 - Electro-mechanical surgical device
