The present invention relates to methods and articles for anchoring within a natural bodily lumen. An anchor is adapted to provide differing radially-outward forces along its length, a securing force and a transitional force. Production of these forces can be controlled by varying a physical property...http://www.google.fr/patents/US7815591?utm_source=gb-gplus-shareBrevet US7815591 - Atraumatic gastrointestinal anchor
