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Body-worn pulse oximeter

  • US 10,813,562 B2
  • Filed: 10/02/2017
  • Issued: 10/27/2020
  • Est. Priority Date: 06/17/2009
  • Status: Active Grant
First Claim
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1. A method for determining a peripheral oxygen saturation (SpO2) value from a patient, comprising:

  • recursively calculating and displaying the SpO2 value by(a) measuring a first time-dependent signal by detecting a first radiation emitted by a first radiation source after it passes through tissue of the patient;

    (b) measuring a second time-dependent signal by detecting a second radiation emitted by a second radiation source after it passes through the tissue of the patient;

    (c) measuring a time-dependent motion signal with at least one motion sensor;

    (d) measuring a time-dependent electrical signal with an electrical sensor comprising at least two electrodes, wherein the electrical signal is indicative of a pulse pressure wave launched by the patient'"'"'s heart;

    (e) processing the time-dependent electrical signal to determine at least one reference time point;

    (f) processing the time-dependent motion signal to determine a motion-related event that affects at least one of the first and second time-dependent signals;

    (g) processing both the first and second time-dependent signals from the at least one reference time point and outside of the motion-related event to determine a time-dependent value related to the patient'"'"'s SpO2;

    (h) iterating steps (a) (g) for a pre-determined period to calculate an average value from a series of the time-dependent values determined during the pre-determined period, wherein time-dependent values from the series that differ from the average value by more than one standard deviation are discarded and the average value is recalculated without the discarded time-dependent values;

    (i) processing the average value to determine the current oxygen saturation value and displaying the current SpO2 value; and

    (j) recursively performing steps (a)-(i) such that the average value is a rolling average updated at each pulse pressure wave.

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