<http://webisa.webdatacommons.org/300221070> <http://www.w3.org/ns/prov#wasQuotedFrom> <google.es> . <http://webisa.webdatacommons.org/prov/338478750> <http://www.w3.org/ns/prov#wasDerivedFrom> <http://webisa.webdatacommons.org/300221070> . <http://webisa.webdatacommons.org/300221070> <http://www.w3.org/ns/prov#value> "In the present invention, the frame is a substantially cylindrical structure capable of maintaining said body channel open in its expanded state and supporting said collapsible valvular structure." . <http://webisa.webdatacommons.org/300221070> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://www.w3.org/ns/prov#Entity> . <http://webisa.webdatacommons.org/prov/352352275> <http://www.w3.org/ns/prov#wasDerivedFrom> <http://webisa.webdatacommons.org/300221070> .