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Mask system

  • US 10,603,461 B2
  • Filed: 03/20/2015
  • Issued: 03/31/2020
  • Est. Priority Date: 06/06/2005
  • Status: Active Grant
First Claim
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1. An elbow assembly for a patient interface configured to deliver positive pressure gas for respiratory therapy to a patient to treat sleep disordered breathing, the elbow assembly comprising:

  • a main body with a first end, a second end and a bend between the first and second ends, the first end being adapted to connect to the patient interface and the second end being adapted to connect to an air delivery tube;

    an opening in a wall of the main body;

    a support member that sealingly covers the opening in the wall and is securable to the main body, the support member comprising a first end and a second end opposite the first end, the first end of the support member having a first arcuate cross-section, the second end of the support member having a second arcuate cross-section, the first and second arcuate cross-sections having different radii of curvature, opposing sides of the arcuate shapes of the first and second arcuate cross-sections terminating at a pair of lateral sides extending from the first end to the second end;

    an anti-asphyxia valve (AAV) attached to the support member and including a flap portion;

    a port arranged and sized to be closed by the flap portion when the positive pressure gas flows through the main body, from the second end of the main body to the first end of the main body; and

    a rib attached to the support member between the pair of lateral sides and spaced apart from the pair of lateral sides, a smallest dimension of the rib being in a direction perpendicular to the flow of gas entering the elbow assembly,wherein a recessed outer surface of the main body is configured to engage an inner surface of the support member when the support member is mounted on the main body.

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