A surgical instrument is provided for performing operations on joints, comprising an elongated hollow body; an elongated tube fixedly connected at one end to the body and adapted for insertion into a joint at a selected location; a manipulator shaft axially movable in the tube and in the body; a substantially...http://www.google.de/patents/US4444184?utm_source=gb-gplus-sharePatent US4444184 - Surgical instrument for operating on joints
