Vent valve apparatus
AssigneeResMed Limited
InventorShane Hollis
Life of this patent
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Abstract
A vent valve apparatus (10) for use with a system for supplying breathable gas pressurised above atmospheric pressure to a human or animal. The apparatus (10) includes a gas washout vent (15), a vent valve (18) adapted to progressively restrict the flow area of the washout vent (15), and a pressure sensitive vent valve control means (20,22,23). The control means is adapted to progressively cause the vent valve (18) to restrict the flow area of the gas washout vent (15) in response to increases in the pressure of the gas supply, thereby substantially regulating the volumetric flow of gas and/or CO2 gas through the washout vent (15) over a range of gas supply pressures.
Claims25
A vent valve apparatus for use with a system for supplying breathable gas pressurised above atmospheric pressure to a human or animal, the apparatus includes a gas washout vent, a vent valve adapted to progressively restrict the flow area of the washout vent, and a pressure sensitive vent valve control means adapted to progressively cause said vent valve to restrict the flow area of the gas washout vent in response to increases in the pressure of the gas supply, thereby substantially regulating the volumetric flow of gas and/or CO2 gas through the washout vent over a range of gas supply pressures.
An apparatus as claimed in claim 17 wherein, the vent valve apparatus is provided in an air supply conduit substantially adjacent the mask.
Dependencies are inferred from the claim text.