An apparatus for tissue dissection and instrument anchoring, including a dissection balloon having a viewing window (preferably a rigid, transparent window) at its distal end, or including an anchoring or dissection balloon having nonuniform elasticity selected to achieve desired...http://www.google.co.uk/patents/US5728119?utm_source=gb-gplus-sharePatent US5728119 - Method and inflatable chamber apparatus for separating layers of tissue
