A surgical instrument having a protective distal insert is provided. The instrument generally comprises a tubular member containing a push rod which is axially movable within the tubular member by means of a proximal actuation handle. The tubular member is provided with a clevis at a distal end....http://www.google.es/patents/US5695521?utm_source=gb-gplus-sharePatente US5695521 - Tubular sheath protective insert
