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Multi-Wavelength Physiological Monitor

  • US 20080154104A1
  • Filed: 03/10/2008
  • Published: 06/26/2008
  • 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, wherein the pulse oximetry sensor comprises;

    three or more light emitting diodes, wherein each light emitting diode is operative to emit light of a different wavelength; and

    a detector adapted to receive light from the at least three light emitting diodes after being attenuated by tissue of a medical patient, wherein the detector provides an output signal based at least in part upon the received light; and

    a processor configured to compute a ratio based at least in part on three or more plethysmographic signals obtained from the output signal, the ratio configured to have reduced tolerance at lower blood oxygen saturation levels compared to a two wavelength blood oxygen saturation system.

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