Patent ID: 8267091

Claim:
A patient interface for use as part of a system for delivering a supply of gases to a user, the patient interface comprising: a hollow body adapted to locate onto a face of the user in use, said hollow body comprising an inside, an outside and an aperture passing from said inside of said hollow body to said outside of said hollow body, an elbow connector adapted to connect between said aperture and the supply of gases so that in use said inside of said hollow body is in fluid communication with the supply of gases through said elbow connector, said elbow connector comprising a funnel located within said elbow connector, said elbow connector comprising as least one outlet bias hole, said funnel adapted so that in use a substantial portion of gases expired from the user pass through said funnel and pass out of said patient interface through said at least one outlet bias hole, and said funnel shielding said at least one outlet bias hole from an inlet flow of gases supplied to the user, said funnel located in and extending along a portion of said elbow connector that is substantially vertical when the user is lying on his or her back wearing said patient interface, said funnel extending from said at least one bias vent hole to a point at or close to a connection between said elbow connector and said hollow body, said funnel fixed against rotation within said elbow connector.