Patent ID: 6237592
Filing Date: 2001-05-29
Classification: A61M

Abstract:
A flow generator for the supply of breathable gas comprising:a turbine for supplying the breathable gas,an electric motor for driving the turbine,control circuitry for controlling the electric motor,a pressure transducer to sense delivery pressure at or remote from said flow generator and provide a signal indicative of pressure to said control circuitry, andsensing means connected to said control circuitry,wherein said control circuitry is programmed to determine from said sensing means whether the electric motor or the turbine are operating and from the pressure transducer whether there is no pressure activity, and if both determinations are true, to accept the value of the signal as a calibrated pressure offset value representative of atmospheric pressure, the control circuitry then controlling the motor in response to the value of the signal from the transducer relative to the value of the signal at the calibrated offset value.