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Heart-sound detecting apparatus and pulse-wave-propagation-velocity-relating-information obtaining system using the heart-sound detecting apparatus

  • US 6,845,263 B2
  • Filed: 07/02/2001
  • Issued: 01/18/2005
  • Est. Priority Date: 02/18/2000
  • Status: Expired due to Fees
First Claim
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1. A system for obtaining information relating to a propagation velocity at which a pulse wave propagates along an artery of a living subject, the system comprising:

  • a heart-sound detecting apparatus comprising;

    a heart-sound microphone which detects a plurality of heart sounds produced by a heart of a living subject and outputs a heart-sound signal representative of the detected heart sounds;

    a smoothing device for smoothing, by differentiation, a waveform of the heart-sound signal output from the heart-sound microphone;

    a squaring device for squaring an amplitude of the smoothed waveform with respect to a base line of the heart-sound signal; and

    a start-point determining device for determining a start point of a first heart sound I as one of the plurality of detected heart sounds, based on that the squared amplitude being greater than a prescribed threshold value;

    a pulse-wave detecting device which is adapted to be worn on the subject to detect the pulse wave which propagates along the artery of the subject; and

    a pulse-wave-propagation-velocity-relating-information obtaining device for obtaining information based on a time of the start point of the first heart sound I determined by the start-point determining device of the heart-sound detecting apparatus, and a time when a rising point of the pulse wave is detected by the pulse-wave detecting device.

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