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Respiratory mask having gas washout vent and gas washout vent for respiratory mask

  • US 6,581,594 B1
  • Filed: 05/15/2000
  • Issued: 06/24/2003
  • Est. Priority Date: 05/15/2000
  • Status: Expired due to Term
First Claim
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1. A respiratory mask comprising:

  • a mask shell that can be fitted over a user'"'"'s nose;

    a cushion positioned in proximity to an edge portion of the mask shell to aid in fitting the mask shell to a user'"'"'s face;

    a breathable gas inlet that can conduct gas through the mask shell to a breathing cavity formed between the mask shell and a user'"'"'s face when the mask is in use; and

    a gas washout vent made from a thin air permeable membrane formed, constructed and arranged to allow gas to exit from the breathing cavity, wherein the membrane includes a plurality of tapered holes.

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