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Pulse wave analysis apparatus and pulse wave analysis program product for automatically extracting characteristic points of pulse wave

  • US 7,074,193 B2
  • Filed: 06/10/2005
  • Issued: 07/11/2006
  • Est. Priority Date: 06/14/2004
  • Status: Active Grant
First Claim
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1. A pulse wave analysis apparatus comprising:

  • a pressure sensor for detecting a pulse wave;

    a digital conversion unit for converting a pressure signal from said pressure sensor into a digital signal;

    a fourth derivative filter having an adjustable frequency characteristic for obtaining a fourth derivative wave of an original waveform based on said digital signal generated by the conversion by said digital conversion unit;

    a local extremum calculation unit for calculating local extrema of said fourth derivative wave in a section of the pulse wave corresponding to one beat; and

    a characteristic point calculation unit for calculating a characteristic point of said pulse wave, whereinsaid characteristic point calculation unit includes;

    a first calculation unit for calculating an early systolic component based on said local extrema of said fourth derivative wave; and

    a second calculation unit for calculating a late systolic component based on said local extrema of said fourth derivative wave.

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