This is directed to methods and devices suited for maintaining an opening in a wall of a body organ for an extended period. More particularly devices and methods are directed maintaining patency of channels that alter gaseous flow within a lung to improve the expiration cycle of, for instance, an individual...http://www.google.de/patents/US7462162?utm_source=gb-gplus-sharePatent US7462162 - Antiproliferative devices for maintaining patency of surgically created channels in a body organ
