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Apparatus and method for improved photoplethysmographic monitoring of multiple hemoglobin species using emitters having optimized center wavelengths

  • US 5,983,122 A
  • Filed: 12/12/1997
  • Issued: 11/09/1999
  • Est. Priority Date: 12/12/1997
  • Status: Expired due to Term
First Claim
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1. An apparatus for the measurement of a concentration value for a plurality of blood analytes comprising:

  • a set of emitters which illuminate the tissue portion of the patient with a plurality of light signals each having a distinct spectral content characterized by a center wavelength wherein the center wavelength characterizing a first emitter is between approximately 610 and 640 nm, the center wavelength characterizing a second emitter is between approximately 680 and 770 nm, the center wavelength characterizing a third emitter is between approximately 850 and 1000 nm,a photodetector which detects the light transmitted through the tissue portion and generates a plurality of received light intensity signals;

    a central processing unit;

    a means for communicating said plurality of received light intensity signals from the photodetector to said central processing unit;

    wherein said central processing unit calculates the concentration value for each of the plurality of blood analytes from the plurality of received light intensity signals.

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