A surgical procedure includes forming an incision in a patient placed in the right lateral recumbent position to facilitate forming a retroperitoneal cavity. Dissection is formed with a balloon cannula, and the retroperitoneal cavity thus formed is then maintained by a mechanical lift...http://www.google.fr/patents/US5816257?utm_source=gb-gplus-shareBrevet US5816257 - Gasless retroperitoneal surgical procedure
