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Composite signal implementation for acquiring oximetry signals

  • US 5,094,239 A
  • Filed: 10/05/1989
  • Issued: 03/10/1992
  • Est. Priority Date: 10/05/1989
  • Status: Expired due to Term
First Claim
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1. A blood oxygen saturation monitoring system for non-invasive measurement of oxygen saturation in the blood of a subject comprising:

  • a first source of electromagnetic radiation at a first wavelength;

    a second source of electromagnetic radiation at a second wavelength;

    means for positioning said first and second sources of electromagnetic radiation to illuminate a sample of blood in tissue;

    detecting means for receiving electromagnetic radiation transmitted through or reflected from said sample of blood, and for providing an electrical output signal indicative of the intensity of said detected electromagnetic radiation for each of said wavelengths; and

    data processing means for correlating said detected electromagnetic radiation with the blood oxygen saturation of said tissue, said data processing means comprising;

    low pass filter means for removing high frequency noise from the electrical output signal of said detecting means;

    amplifier means for amplifying said electrical output signal;

    analog-to-digital converter means having a resolution of at least 14 bits, for converting said electrical output signal into digital data prior to any separation of said electrical output signal into a DC component and a pulsatile component; and

    processing means for processing said digital data by separating said digital data into said DC component and said pulsatile component for each of said wavelengths and for producing a ratio of said pulsatile component to said DC component for each of said wavelengths and for determining said blood oxygen saturation based on said ratios.

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