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Method and Apparatus for Determining One or More Blood Parameters From Analog Electrical Signals

  • US 20100286497A1
  • Filed: 05/05/2010
  • Published: 11/11/2010
  • Est. Priority Date: 05/06/2009
  • Status: Active Grant
First Claim
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1. ) An apparatus for obtaining physiological information from a subject the apparatus comprising:

  • a) one or more light sources configured to apply partially or entirely coherent light to a target region of the subject to induce a light response signal from the illuminated target region;

    b) a detection system including;

    i) a first photodetector configured to detect the light response signal prevailing at a first location to generate a first photodetector analog electrical signal; and

    ii) a second photodetector configured to detect the second light response signal prevailing at a second location to generate a second photodetector analog electrical signal, the second location being offset from the first location by an offset distance that is at least 0 5 mm and at most 2 cm;

    c) an analog electronics assembly configured to generate, from the first and second analog electrical signals, a difference analog electrical signal that is indicative of a difference between the light response signal at the first location and light response signal at the second location;

    d) a digitizer for digitizing the difference analog electrical signal to generate a digitized signal; and

    e) a digital processing unit operative to receive and analyze the digitized signal to compute at least one physiological parameter of the subject.

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