Physiological signal monitoring system

  • US 6,616,613 B1
  • Filed: 04/27/2000
  • Issued: 09/09/2003
  • Est. Priority Date: 04/27/2000
  • Status: Expired due to Fees
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First Claim
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1. A physiological signal monitoring system comprising:

  • (a) a PPG sensor adapted to come into skin contact with a user'"'"'s body part, for sensing a physiological characteristic of the user and for generating electrical signals which correspond to said physiological characteristic, wherein said physiological characteristic comprises the user'"'"'s blood volume contour;

    (b) first processing means operatively coupled to said sensor for receiving and converting said electrical signals into data, for computing a set of physiological parameters on the basis of said data and for conducting analysis of said physiological parameters, said first processing means comprising;

    (i) filtering means for filtering nonpulsatile and slowly pulsatile signals from the blood volume contour to obtain a filtered blood volume contour;

    (ii) extraction means for extracting characteristics of the user'"'"'s aortic reflected wave contour from a volume contour chosen from one of the blood volume contour and the filtered blood volume contour, the characteristics of the user'"'"'s aortic reflected wave contour being determined in part from a fourth derivative of said volume contour;

    (iii) computing means for determining the set of physiological parameters based on characteristics of said aortic reflected wave; and

    , (c) display means coupled to said first processing means for displaying said physiological parameters.

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