The invention relates to improved means for preventing eversion and subsequent obstruction of thin-walled, floppy gastrointestinal liners implanted in the digestive tract of an animal. The implantable devices include an anchor adapted for attachment within a natural body lumen and a thin-walled, floppy...http://www.google.es/patents/US7766973?utm_source=gb-gplus-sharePatente US7766973 - Eversion resistant sleeves
