A trocar obturator having a removable replaceable tip includes an obturator tip having a sharpened distal end and a first engagement device on its proximal end; an obturator shaft having a second engagement device on its distal end for lockingly engaging the first engagement device and securing the tip...http://www.google.fr/patents/US6106539?utm_source=gb-gplus-shareBrevet US6106539 - Trocar with removable, replaceable tip
