A surgical instrument (e.g., endocutter, grasper, cutter, staplers, clip applier, access device, drug/gene therapy delivery device, and energy device using ultrasound, RF, laser, etc.) may benefit from having a plurality of hydraulically actuated subsystems (e.g., severing, stapling, articulation, locking/unlocking,...http://www.google.com.au/patents/US7246734?utm_source=gb-gplus-sharePatent US7246734 - Rotary hydraulic pump actuated multi-stroke surgical instrument
