An expansible laparoscopic tunneling apparatus for creating an anatomic working space. The apparatus provides laparoscopic observation both during tunneling operations, when the apparatus is advanced bluntly to a desired location within the body of a patient, and during subsequent tissue dissection when...http://www.google.com/patents/US5607443?utm_source=gb-gplus-sharePatent US5607443 - Expansible tunneling apparatus for creating an anatomic working space with laparoscopic observation
