CPC A61M 16/0683 (2013.01) [A61M 16/06 (2013.01); A61M 16/0616 (2014.02); A61M 16/0633 (2014.02); A61M 16/0816 (2013.01); A61M 16/0858 (2014.02); A61M 2210/0618 (2013.01)] | 20 Claims |
1. A patient interface system for delivering breathable gas to a patient, comprising:
a flexible patient interface structure arranged to interface with and deliver air to a nose of the patient in use, the patient interface structure comprising:
protrusions extending from respective opposite sides of the flexible patient interface structure, each protrusion being configured to receive the breathable gas from an air delivery tube or air delivery tube connector and having an outwardly extending circumferential flange at a terminal end; and
a central gas washout vent region located between the protrusions and comprising an array of vent openings, a wall thickness of flexible patient interface structure being thickened at the central gas washout vent region than other adjacent regions of the flexible patient interface structure so that a channel is formed between the circumferential flanges on the protrusions and the central gas washout vent region; and
a frame configured to support the patient interface structure, the frame comprising a pair of cylinders, each cylinder having an inner circumferential surface configured to receive a respective protrusion of the patient interface structure,
wherein the cylinders of the frame are configured to be received within the respective channels formed by the central gas washout vent region and the circumferential flanges.
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