A surgical instrument having a handpiece; a vibration source within the handpiece for generating mechanical vibrations in response to current supplied thereto; an elongated tool operatively associated with the vibration source and attached to the handpiece at a point where essentially no vibrational...http://www.google.es/patents/US5176677?utm_source=gb-gplus-sharePatente US5176677 - Endoscopic ultrasonic rotary electro-cauterizing aspirator
