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Active pulse blood constituent monitoring

  • US 5,638,816 A
  • Filed: 06/07/1995
  • Issued: 06/17/1997
  • Est. Priority Date: 06/07/1995
  • Status: Expired due to Term
First Claim
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1. A method of actively varying the attenuation of optical radiation due to blood in a fleshy medium comprising the steps of:

  • transmitting optical radiation through said fleshy medium;

    detecting said optical radiation after attenuation through a field of view through said fleshy medium;

    generating an output signal indicative of an intensity of an attenuated signal; and

    applying pressure to said fleshy medium according to a predictable cyclic pattern to influence a cyclic change in the volume of blood in said fleshy medium in said field of view to produce no more than 40% modulation in said attenuated signal.

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