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Method and apparatus for determining physiological characteristics

  • US 20010037059A1
  • Filed: 03/23/2001
  • Published: 11/01/2001
  • Est. Priority Date: 03/29/2000
  • Status: Active Grant
First Claim
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1. A method for determining the blood oxygen saturation level of a subject, comprising the steps of:

  • acquiring a first blood oxygen signal from the subject, said blood oxygen signal having an undesirable artifact signal component;

    acquiring an additional physiological signal having a heart rate component, said second acquiring step using an acquisition technique that is different and independent from said first acquiring step;

    processing said first blood oxygen signal and said physiological signal to provide a first waveform signal having a reduced level of said artifact signal component therein;

    processing said first waveform and said physiological signal to provide a reference waveform; and

    processing said reference waveform and said physiological signal to provide a second blood oxygen signal corresponding to the blood oxygen saturation level of said subject.

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