Method and apparatus for processing signals used in oximetry

Details Method and apparatus for processing signals used in oximetry Method and apparatus for processing signals used in oximetry

G - Physics

01

N

354/22, 73/55

G01N 21/25 (2006.01) G06F 17/00 (2006.01)

Patent

CA 1298483

METHOD AND APPARATUS FOR PROCESSING SIGNALS USED IN OXIMETRY Abstract The present invention relates to the processing of signals containing information about the pulse rate and oxygen saturation of arterial blood flowing in tissue. These signals have a relatively periodic pulsatile component superimposed upon a varying baseline component. To determine the pulse rate and oxygen saturation from the signals, the positive peaks, negative peaks, and period of the signal must be determined. The present invention accomplishes this by first searching for a sustained positive sloping region of the signal. Then the first derivative of the signal with respect to time is analyzedand points on the signal before and after the occurrence of a slope reversal marked. If the slope at the first point is positive, the interval between the two points is searched for a maximun amplitude that is identified as a positive peak. After the occurrence of a negative sloping region of the signal, another pair ofpoints are marked occurring before and after a subsequent slope reversal. The minimum amplitude of the signal between these points is then identified as a negative peak. For improved accuracy, these positive and negative peaks are then compared with waveform templates to determine whether the amplitude between the peaks falls within an allowable range and to determine whether the interval between the peaks likewise falls within an acceptable range. These ranges are adjustable in proportion to the amplitude and interval compared against them. In this manner, values for the positive peak, negative peak, and period of the signal can be determined with high reliability.

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