Patient interface with foam cushion

A patient interface configured to deliver a flow of positive pressure respiratory gas to an entrance of a patient's airways including at least an entrance of the patient's nares, the patient interface being configured to maintain a therapy pressure in a range of about 4 cmH2O to about 30 cmH2O above ambient pressure in use, throughout the patient's respiratory cycle, while the patient is sleeping, to ameliorate sleep disordered breathing, the patient interface comprising:

• an elastomeric support wall forming at least part of a plenum chamber configured to receive the flow of positive pressure respiratory gas;
• an elastomeric support flange positioned at an end of the elastomeric support wall and extending radially inward from the support wall;
• and
• a foam cushion mounted on the support flange, the foam cushion being configured to form a seal with the patient's face,
• wherein an elastomeric wall thickness of the support flange varies from a central superior region of the support flange to a central inferior region of the support flange,
• wherein the thickness of the elastomeric support wall is greatest in a thickened region, and
• wherein the increased thickness of the thickened region of the elastomeric support wall does not extend into the elastomeric support flange.

A patient interface configured to deliver a flow of positive pressure respiratory gas to an entrance of a patient's airways including at least an entrance of the patient's nares, the patient interface being configured to maintain a therapy pressure in a range of about 4 cmH2O to about 30 cmH2O above ambient pressure in use, throughout the patient's respiratory cycle, while the patient is sleeping, to ameliorate sleep disordered breathing, the patient interface comprising:

• a shell with an inlet opening configured to receive the flow of positive pressure respiratory gas;
• an elastomeric support wall mounted to the shell, the shell and the elastomeric support wall together forming at least part of a plenum chamber configured to receive the flow of positive pressure respiratory gas, the elastomeric support wall comprising a pair of thickened regions on opposing sides of a plane that bisects the elastomeric support wall and extends from the superior side of the elastomeric support wall to the inferior side of the elastomeric support wall;
• an elastomeric support flange positioned at an end of the elastomeric support wall and extending radially inward from the support wall;
• and
• a foam cushion mounted on the support flange, the foam cushion being configured to form a seal with the patient's face,
• wherein the inlet opening has a central longitudinal axis that extends through an anterior aperture configured to receive the patient's nose, and
• wherein the elastomeric support wall and the foam cushion are configured so that when the patient interface is mounted on the patient's face, a part of the central longitudinal axis extending outwardly from the anterior side of the patient interface extends in an inferior direction,
• wherein the thickness of the elastomeric support wall is greatest in the pair of thickened regions, and
• wherein the increased thickness of the thickened regions of the elastomeric support wall does not extend into the elastomeric support flange.