Patent ID: 6510329
Filing Date: 2003-01-21
Classification: A61B,Y10S

Abstract:
A method for use in detecting and responding to a sensor off condition in a pulse oximetry system, said pulse oximetry system including a first source for providing a first channel signal associated with a first wavelength and a second source for providing a second channel signal associated with a second wavelength, said method comprising the steps of:obtaining first and second detector signals associated with said first and second wavelengths, respectively; monitoring said first and second detector signals over time period including a first time window and a second time window; first determining a first correlation value relating to a first correlation between said first and second signals for said first time window; second determining a second correlation value relating to a second correlation between said first and second signals for said second time window; performing a comparison between said first and said second correlation values; based on said comparison, determining a change value related to a change in said first correlation value relative to said second correlation value; and identifying a sensor off condition based on said change value.