Patent ID: 8459258
Filing Date: 2013-06-11
Classification: A61B,A61M

Abstract:
1. An apparatus for inducing and maintaining a target end tidal gas concentration of a gas X in a subject, comprising: a) an inlet for at least one component gas of a source gas; b) a source gas outlet configured for connection to a partial re-breathing circuit; and c) means for controlling the end tidal concentration of the gas X based on the rate of flow of the source gas into the partial rebreathing circuit and the concentration of the gas X in the source gas using an algorithm in which: where {dot over (V)}X is the subject's minute consumption of the gas X, F T ET X is the target end tidal concentration of the gas X, and {dot over (V)}G 1 is the flow rate of the source gas; where {dot over (V)}X is the subject's minute production of the gas X, F T ET X is the target end tidal concentration of the gas X, and {dot over (V)}G 1 is the flow rate of the source gas.