×

Adjusting parameters used in pulse oximetry analysis

  • US 9,131,879 B2
  • Filed: 07/12/2012
  • Issued: 09/15/2015
  • Est. Priority Date: 10/28/2005
  • Status: Active Grant
First Claim
Patent Images

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.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×