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Mask and a vent assembly therefor

  • US 6,561,191 B1
  • Filed: 12/01/1999
  • Issued: 05/13/2003
  • Est. Priority Date: 02/10/1997
  • Status: Expired due to Term
First Claim
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1. A mask assembly for use with a system for supplying breathable gas pressurized above atmospheric pressure to a human or animal'"'"'s airways, the mask assembly comprising:

  • a mask that is, in use, in fluid communication with a gas supply conduit; and

    a gas washout vent assembly, wherein the gas washout vent assembly includes at least one gas washout orifice extending from an inner side of the vent assembly positioned, in use, adjacent the human or animal'"'"'s face to an outer side positioned, in use, adjacent the atmosphere;

    wherein the gas washout orifice is open in use and a cross-sectional area of the orifice at the inner side vent assembly is larger than a cross-sectional area of the orifice at the outer side of the vent assembly; and

    wherein the inner side of the vent assembly extends inside the mask or conduit and the outer side of the vent assembly extends outside the mask or conduit.

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