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System and method for a non-invasive medical sensor

  • US 10,485,463 B2
  • Filed: 10/10/2014
  • Issued: 11/26/2019
  • Est. Priority Date: 10/10/2014
  • Status: Active Grant
First Claim
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1. A method for eliminating error when using a non-invasive optical sensing system comprising:

  • providing a first detector and a second detector in a non-invasive optical sensor, the first detector and the second detector having different respective spectral response curves;

    emitting light from a non-monochromatic light source in the non-invasive optical sensor periodically;

    emitting red light and infrared light from one or more monochromatic light sources;

    generating a first oxygen saturation value, based on a ratio of the red light detected by the first and second detectors, and the infrared light detected by the first and second detectors;

    generating a second oxygen saturation value, based on the non-monochromatic light detected by the first and second detectors; and

    substituting the first oxygen saturation value with the second oxygen saturation value in response to a determination that a ratio of a first measured centroid wavelength of the red light by the first detector and a second measured centroid wavelength of the red light by the second detector is outside of a threshold.

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