About: http://webisa.webdatacommons.org/166667813

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	The retractor may be used to spread a joint, such as a knee joint or shoulder joint, or may be used to separate tissue planes generally, to improve visualization and create a working space for the surgeon.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com.au