A stapler for stapling a tubular structure to another structure. The stapler has an anvil which is expandable from a collapsed position to an expanded position. The stapler has a recess which receives at least a portion of the tubular structure and a shoulder which receives an everted end of the tubular...http://www.google.es/patents/US6631837?utm_source=gb-gplus-sharePatente US6631837 - Surgical stapling instrument and method thereof
