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Pulse oximeter and sensor optimized for low saturation

  • US 7,415,298 B2
  • Filed: 02/23/2007
  • Issued: 08/19/2008
  • Est. Priority Date: 04/01/1994
  • Status: Expired due to Fees
First Claim
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1. A method for measuring blood oxygen saturation comprising:

  • emitting light from at least one light source of a pulse oximeter sensor;

    detecting a plurality of light spectrums having time-varying components from the light with at least one detector of the pulse oximeter sensor subsequent to the light being scattered by tissue, the plurality of light spectrums including a first light spectrum having a wavelength range optimized for high oxygen saturation, a second light spectrum having a wavelength range optimized for low oxygen saturation, and a third light spectrum having a wavelength between 800 and 1000 nanometers; and

    calculating a blood oxygen saturation reading using a pulse oximetry algorithm based on at least two of the detected light spectrums.

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