Patent ID: 9550038
Date: 2017-01-24
CPC Classifications: A61M

Claim:
1. A mask assembly for delivering positive airway pressure to a user, the mask comprising: a prong part comprising a hollow body, a prong part inlet and first and second nasal prongs extending from the hollow body, the prong part being flexible and formed as a single piece; a rigid mask body connectable to the prong part inlet so as to define an enclosed space, the rigid mask body comprising a first headgear extension extending from a left side of the rigid mask body and including a first headgear strap connection location and a second headgear extension extending from a right side of the rigid mask body and including a second headgear strap connection location; the rigid mask body further comprising an outer surface having at least a curved portion, the curved portion comprising a left side portion disposed on a left side of a center of the outer surface of the rigid mask body and a right side portion disposed on a right side of the outer surface of the rigid mask body; a left side recessed surface portion disposed on the left side portion, the left side recessed surface portion disposed within a left side semi-oval periphery disposed on the left side portion; a right side recessed surface portion disposed on the right side portion, the right side recessed surface portion disposed within a right side semi-oval periphery disposed on the right side portion, wherein the left and right semi-oval peripheries have rounded profiles; a headgear strap comprising first and second ends, the first end connected to the first headgear extension at the first headgear strap connection location and the second end connected to the second headgear extension at the second headgear strap connection location, the headgear strap configured to maintain the prong part in a position with the first and second nasal prongs against a user's nares in use; left and right pluralities of apertures, the left plurality of apertures disposed in the left side recessed surface portion, the right plurality of apertures disposed in the right side recessed surface portion, the left and right pluralities of apertures defining a bias flow vent configured to vent a gas from the enclosed space, to an outside of the rigid mask body during use, wherein the left and right pluralities of apertures are disposed between the first and second headgear extensions; and an inspiratory conduit connected to the rigid mask body and configured to deliver pressurized gases into the enclosed space for inhalation by a user in use.