CPC A61M 16/0683 (2013.01) [A61M 16/0003 (2014.02); A61M 16/0051 (2013.01); A61M 16/0057 (2013.01); A61M 16/022 (2017.08); A61M 16/06 (2013.01); A61M 16/0605 (2014.02); A61M 16/0616 (2014.02); A61M 16/0622 (2014.02); A61M 16/0633 (2014.02); A61M 16/0875 (2013.01); A61M 16/0825 (2014.02); A61M 16/20 (2013.01); A61M 2016/0027 (2013.01); A61M 2016/0661 (2013.01); A61M 2205/0266 (2013.01); A61M 2205/10 (2013.01); A61M 2205/15 (2013.01); A61M 2205/3344 (2013.01)] | 23 Claims |
1. A patient interface for sealed delivery of a flow of air at a continuously positive pressure with respect to ambient air pressure to an entrance to a patient's airways including at least entrance of a patient's nares, the patient interface comprising:
a shell with a central opening configured to receive the pressurized flow of air;
a foam cushion comprising:
an outwardly facing surface configured to face the patient's face in use;
an inwardly facing surface opposite the outwardly facing surface; and
an interior surface extending from the inwardly facing surface to the outwardly facing surface; and
an elastomeric support portion that is attached to the shell, supports the foam cushion, and forms at least part of a chamber together with the shell and the foam cushion, the elastomeric support portion comprising:
a side wall that forms a continuous perimeter around the chamber; and
a resiliently flexible lip that supports the foam cushion and extends from the side wall toward an interior of the chamber, the resiliently flexible lip comprising an outer perimeter that is anchored to the side wall and an unsupported inner perimeter,
wherein the inwardly facing surface of the foam cushion is in contact with the resiliently flexible lip and extends inwardly beyond the resiliently flexible lip so that the foam cushion overhangs the inner perimeter of the resiliently flexible lip, and
wherein the shell is more rigid than the elastomeric support portion.
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