An incrementally adjustable wound retractor, which provides access to a body cavity, includes an inner ring having a diameter greater than the desired diameter of the wound incision, an outer ring having an annular axis and a diameter greater than the desired diameter of the wound incision, and a flexible...http://www.google.fr/patents/US7909760?utm_source=gb-gplus-shareBrevet US7909760 - Split hoop wound retractor with gel pad
