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Sensor device and method for measuring and determining a pulse arrival time (PAT) value

  • US 10,165,951 B2
  • Filed: 09/28/2012
  • Issued: 01/01/2019
  • Est. Priority Date: 03/29/2010
  • Status: Active Grant
First Claim
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1. A method for measuring and determining a single pulse arrival time (PAT) value at a given location of a user, wherein the PAT value is the time for a pulse to arrive at said location following a contraction of the heart of the user, using a sensor device comprising a photoplethysmographic (PPG) multichannel sensor formed from a plurality of PPG sensor channels and being adapted to measure a set of PPG signals, each PPG signal being measured by one of the PPG sensor channels when the multichannel PPG sensor is in contact with the user;

  • comprising;

    measuring noninvasively said set of PPG signals;

    extracting a plurality of features from each of the measured PPG signals;

    selecting a subset from the set of PPG signals based on the extracted features; and

    processing the selected subset of PPG signals to noninvasively determine the PAT value,wherein said selecting the subset of PPG signals comprises;

    projecting the plurality of features extracted from each of the measured PPG signal into a set of points in a N-dimensional feature space where N corresponds to the number of extracted features for each PPG signal;

    clustering the set of points according to a distance criterion; and

    selecting points being located at a representative cluster, the selected points corresponding to the subset of PPG signals.

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