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Multi-wavelength physiological monitor

  • US 9,339,220 B2
  • Filed: 04/12/2013
  • Issued: 05/17/2016
  • Est. Priority Date: 07/07/2004
  • Status: Active Grant
First Claim
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1. A physiological monitor for determining blood oxygen saturation of a patient, the physiological monitor comprising:

  • a pulse oximetry sensor comprising;

    three or more emitters, wherein each emitter is operative to emit light of a different wavelength; and

    at least one detector adapted to receive light from the three or more emitters after being attenuated by tissue of a medical patient; and

    a processor configured to;

    compute a ratio based at least in part on three or more data signals, each of the three or more data signals indicative of light from one of the three or more emitters after being attenuated by the tissue, wherein the ratio comprises a quotient of a first weighted sum of the data signals multiplied by a first set of vector coefficients and a second weighted sum of the data signals multiplied by a second set of vector coefficients;

    determine blood oxygen saturation based at least in part upon a single blood oxygen saturation curve using said ratio; and

    output the oxygen saturation for display to a clinician.

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