An electrosurgical suction/irrigation instrument includes a shaft hub, an electrically conductive member, and a sheath. The conductive member has a proximal end mounted to the shaft hub and a distal end including a conductive operating tip. The sheath covers the conductive member so that the operating...http://www.google.com/patents/US7198625?utm_source=gb-gplus-sharePatent US7198625 - Surgical instrument with retractable sheath
