A tissue penetrating instrument of the type used in the medical field and which may or may not be embodied in the form of an obturator associated with a trocar assembly, wherein the instrument includes an elongated shaft having a penetrating tip mounted on one end thereof. The penetrating tip includes...http://www.google.de/patents/US6478806?utm_source=gb-gplus-sharePatent US6478806 - Penetrating tip for trocar assembly
