A method and apparatus for mechanically lifting the abdominal wall away from underlying abdominal organs for laparoscopic surgery without insufflation. In the method an expansible device is inserted in the abdominal cavity through a small incision in a collapsed state and then expanded into engagement...http://www.google.se/patents/US5634883?utm_source=gb-gplus-sharePatent US5634883 - Apparatus for peritoneal retraction
