A skin seal or trocar stabilizer with an inflatable membrane disposed inside, whereby medical instruments may be passed through the skin seal into a endoscopic work space while the inflatable membrane is inflated, thereby allowing the use of normal short conventional open surgery instruments during endoscopic...http://www.google.se/patents/US5997515?utm_source=gb-gplus-sharePatent US5997515 - Screw-type skin seal with inflatable membrane
