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Multi-wavelength physiological monitor

  • US 7,343,186 B2
  • Filed: 05/27/2005
  • Issued: 03/11/2008
  • 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 medical patient, comprising:

  • a sensor capable of removable attachment to tissue, wherein said sensor comprises;

    at least three light emitting diodes, each light emitting diode being proximate said tissue when said sensor is attached to said tissue and adapted to emit light of a different wavelength; and

    a detector, wherein said detector is adapted to receive light from said at least three light emitting diodes after being attenuated by said tissue, and wherein said detector generates an output signal based at least in part upon said received light; and

    a signal processor configured to;

    calculate a ratio (r) based at least in part on at least three normalized photoplethysmographic waveforms derived from said output signal, said ratio represented as;

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