A medical system for facilitating the removal of body matter including solids, liquids and gases from a body cavity. The system includes mechanical energy applied to the interior surface of a catheter or other type of body drainage conduit to substantially inhibit the adherence of body matter to the...http://www.google.es/patents/US5897534?utm_source=gb-gplus-sharePatente US5897534 - Body fluids and solids drainage system
