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Hybrid optical delivery system for photoplethysmography

  • US 6,647,279 B2
  • Filed: 03/22/2002
  • Issued: 11/11/2003
  • Est. Priority Date: 03/22/2002
  • Status: Active Grant
First Claim
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1. A photoplethysmographic measurement apparatus for measuring one or more blood analyte levels or one or more hemodynamic parameters in a tissue-under-test, comprising:

  • a plurality of separate emitters, wherein each emitter produces a light signal having a unique spectral content, said emitters separated into two sets of at least one emitter each;

    a sensor which makes direct contact with the tissue-under-test and provides an output aperture through which light signals are delivered to the tissue-under-test;

    housing means for housing each of the two sets of emitters in two separate locations, said housing means comprising a first housing means located proximal to said sensor and a second housing means located some distance from said first housing means;

    means for transporting said light signals from said first and said second housing means to said sensor;

    means for guiding the light signals from said first and second housing means through said output aperture to be incident on the tissue-under-test;

    means for receiving a portion of the light signal exiting the tissue-under-test and converting said received light-signal to an electronic signal indicative of the said received light signal;

    means for processing said received light signal to determine one or more blood analyte levels or one or more hemodynamic parameters.

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