Vent assembly
3 Assignments
0 Petitions
Accused Products
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.
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Citations
43 Claims
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1-25. -25. (canceled)
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26. A vent assembly for use with a system for supplying, from a gas supply, breathable gas pressurized above atmospheric pressure to a human or an animal, the assembly including:
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a gas washout vent defining a flow area;
a pressure sensitive control adapted to progressively restrict the flow area of the washout vent in response to increases in the pressure of the gas supply, thereby substantially regulating the flow of gas through the washout vent over a range of gas supply pressures. - View Dependent Claims (27, 28, 29, 30, 31, 32, 33)
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- 34. A vent assembly for use with a system for supplying breathable gas pressurized above atmospheric pressure to a human or animal, the apparatus includes a gas washout vent defined by an orifice, a vent valve having a shape complementary to the shape of the washout vent, the vent valve adapted to progressively restrict the flow area of the washout vent, and a pressure sensitive vent valve control 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 through the washout vent over a range of gas supply pressures.
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38. A vent assembly for use with a system for supplying breathable gas pressurized above atmospheric pressure to a human or animal, the apparatus comprising:
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a gas washout vent defining a flow area;
a pressure sensitive vent control including an elastic diaphragm stretched over a circular orifice, adapted to progressively 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 through the washout vent over a range of gas supply pressures. - View Dependent Claims (39, 40, 41, 42, 43)
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Specification