| http://www.w3.org/ns/prov#value | - In particular, fluids such as gaseous phase carbon dioxide or nitrous oxide are normally introduced in the body for insufflation as part ofthe endoscopic procedure, and the escape of such gases through the portal should be prevented.Many endoscopic portals have valves that close when the penetrating member is removed from the portal to prevent the flow of fluids to and from the body cavity.
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