An occlusion catheter includes a catheter body and an expansion section disposed at the distal end of the catheter body. This section is operable between a low profile state which facilitates insertion of the catheter into a body conduit, and a high profile state which facilitates occlusion of the body...http://www.google.com/patents/US5443449?utm_source=gb-gplus-sharePatent US5443449 - Cholangiography catheter
