Patent ID: 9131879
Filing Date: 2015-09-15
Classification: A61B

Abstract:
1. A method for calculating a physiological parameter, comprising: receiving, via a processor, a signal representing a plurality of pulses, the signal generated in response to detecting light scattered from blood perfused tissue, each pulse having an amplitude and a period, a subset of the plurality of pulses having a plurality of amplitudes and a plurality of periods; determining, via the processor, an average amplitude from the plurality of amplitudes; determining, via the processor, an average period from the plurality of periods; adjusting, via the processor, an amplitude criterion based on the average amplitude and a period criterion based on the average period; evaluating, via the processor, one or more of the plurality of pulses to determine one or more qualified pulses by disqualifying a pulse having an amplitude that is smaller than the amplitude criterion and a period that is greater that the period criterion; ensemble averaging, via an ensemble averaging filter, the one or more qualified pulses; calculating, via the processor, a physiological parameter based at least in part upon one or more ensemble averaged pulses; and outputting, via the processor, the physiological parameter for display.