About: http://webisa.webdatacommons.org/225908006

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	This invention relates to a cannula used for endoscopic surgery, and more particularly to a cannula and method for maintaining a clear visual field for an endoscope housed with the cannula.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com