A hydraulically actuated medical instrument includes an elongated shaft having proximal and distal ends, a hydraulically actuated end effector at the distal end of the shaft and a fluid flow path extending through the shaft to the end effector. The end effector may be directly manually operated by way...http://www.google.co.uk/patents/US6830174?utm_source=gb-gplus-sharePatent US6830174 - Medical instrument
