A drainage device and a method for draining a liner-type medical suction apparatus and a rigid-walled container. The drainage device preferably includes a swingarm, a drainhead, and a suction source. The drainhead is positioned to be in fluid communication with the liner-type suction canister or the...http://www.google.es/patents/US7585292?utm_source=gb-gplus-sharePatente US7585292 - Medical suction apparatus and draining of same
