Apparatus for creating an anatomic space in tissue in a body of a patient using a cannula with proximal and distal extremities and a bore extending therethrough to provide an open end. A balloon having an inflated space is provided. The balloon is capable of assuming collapsed and inflated conditions....http://www.google.de/patents/US5540711?utm_source=gb-gplus-sharePatent US5540711 - Apparatus and method for developing an anatomic space for laparoscopic procedures with laparoscopic visualization
