A patient interface assembly adapted to be connected to a gas supply pump to deliver breathable gas to the inlet of a patient's respiratory system comprises a supply conduit, a patient interface, a branch swivel connector including a Y-piece and an elbow that swivels relative to the Y-piece, the branch...http://www.google.com.au/patents/US7302950?utm_source=gb-gplus-sharePatent US7302950 - Patient interface for respiratory apparatus
