A surgical instrument includes a first device adapted to be connected to a fastener fixed to a first bone portion. A second device includes a first portion associated with the first device and a second portion for supporting a member which engages the fastener fixed to the first bone portion and secures...http://www.google.es/patents/US7618444?utm_source=gb-gplus-sharePatente US7618444 - Surgical instrument for moving a vertebra
