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Mask assembly

  • US 6,823,869 B2
  • Filed: 09/06/2002
  • Issued: 11/30/2004
  • Est. Priority Date: 09/07/2001
  • Status: Expired due to Term
First Claim
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1. A respiratory mask assembly for use in the delivery of non-invasive positive airway pressure to a user, comprising:

  • a substantially rigid shell that includes a channel portion defined by an inner wall, an outer wall and a channel floor, the channel floor has at least one slot portion allowing access from the channel portion to a surface of the shell opposite to the channel floor;

    a face-contacting cushion acting to space the shell away from the user'"'"'s face, said cushion having a retaining channel and a retaining lip adjacent the retaining channel, and a sealing tab extending from the cushion to engage a portion of the shell to provide a continuous airtight seal between the cushion and the shell; and

    a retaining ring configured to secure the cushion to the shell, the retaining ring having a first portion including at least one clip configured to pass through the at least one slot portion such that an underside surface of the at least one clip engages a section of the shell when the retaining ring is positioned within the channel, and a flange extending from a second portion of the retaining ring, the flange being configured to be received within the retaining channel of the cushion.

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