Patent ID: 6957651
Filing Date: 2005-10-25
Classification: A62B

Abstract:
1. A system for simulating the metabolic consumption of oxygen contained in a breathable gas, comprising: a variable volume chamber that cyclically increases in volume to receive said breathable gas and then cyclically decreases in volume to expel an exhaust gas; a source of hydrogen gas coupled to said chamber; a source of carbon dioxide gas coupled to said chamber; means for introducing said hydrogen gas and said carbon dioxide gas into said chamber to mix with said breathable gas thereby forming said exhaust gas, wherein said exhaust gas includes hydrogen and oxygen, wherein said hydrogen gas is introduced in an amount sufficient to react with an amount of said oxygen in said exhaust gas equivalent to that used by a human during a selected level of activity, and wherein said carbon dioxide gas is introduced in an amount equivalent to that provided by a metabolic respiratory quotient associated with said level of activity; and a catalyst coupled to said chamber for receiving said exhaust gas, said catalyst causing a reaction between said hydrogen and said oxygen in said exhaust gas wherein simulated human exhalation is generated.