Patent ID: 8073516

Claim:
A pulse oximetry system for the determination of a physiological parameter wherein said pulse oximetry system is configured to remove motion artifacts from physiological signals, comprising: an optical sensor for providing said pulse oximetry system with photo-plethysmographic data, wherein said sensor comprises a light emitting diode for emitting light and a photo-detector for detecting said light, wherein said detected light contains information on the photo-plethysmographic data; a processor for processing the photo-plethysmographic data; and a memory unit, wherein said memory unit is operably coupled to said processor, and wherein said processor is configured to: (a) acquire said photo-plethysmographic data; (b) transform the photo-plethysmographic data into frequency domain data; (c) analyze the frequency domain data; (d) reconstruct a time domain data photo-plethysmographic signal from said frequency domain data; (e) analyze a second order derivative of the time domain photo-plethysmographic signal to identify parameters; (f) use said parameters to separate a physiological signal from a motion artifact in the time domain photo-plethysmographic signal; and (g) compute a physiological parameter from said motion artifact independent physiological signal.