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Active pulse blood constituent monitoring method

  • US 5,860,919 A
  • Filed: 04/17/1997
  • Issued: 01/19/1999
  • Est. Priority Date: 06/07/1995
  • Status: Expired due to Term
First Claim
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1. A method of non-invasively determining an indication of a concentration of a blood constituent comprising the steps of:

  • transmitting optical radiation through a fleshy medium having blood flowing in accordance with a substantially cyclic pattern, wherein the blood has a concentration of the blood constituent and the optical radiation traverses a path length through the medium, said optical radiation selected so as to be attenuated upon transmission through said flowing blood;

    detecting the optical transmission after attenuation through a field of view portion of the fleshy medium;

    generating an output signal indicative of optical characteristics of the medium;

    actively influencing a change in the volume of blood in said medium in accordance with a predictable pattern with no more than minimal perturbation to the optical path length of the medium in the field of view portion to produce modulation in said output signal; and

    analyzing said signal to determine the indication of the concentration of said blood constituent.

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