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Automatic blood pressure measuring apparatus

  • US 5,031,630 A
  • Filed: 11/28/1989
  • Issued: 07/16/1991
  • Est. Priority Date: 05/06/1989
  • Status: Expired due to Term
First Claim
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1. An automatic blood pressure measuring apparatus comprising;

  • an inflatable cuff having an elongate configuration, said inflatable cuff being adapted to be wound around a body portion of a subject, for pressing an arterial vessel of the subject via a body surface over said arterial vessel;

    first detecting means for detecting at least one proximal arterial sound produced from said arterial vessel as the pressing force of said inflatable cuff applied to the arterial vessel is varied, said first detecting means being located in a proximal end area, as viewed in a direction of width of said inflatable cuff, of an inner surface of the inflatable cuff which surface contacts said body portion of the subject;

    second detecting means for detecting at least one Korotkoff sound produced from said arterial vessel as the pressing force of said inflatable cuff applied to the arterial vessel is varied, said second detecting means being located in a middle area of said inner surface of the inflatable cuff as viewed in said direction of width of the inflatable cuff, said second detecting means being aligned with said first detecting means in the direction of width of the inflatable cuff;

    collecting means for collecting at least one Korotkoff sound, said collecting means collecting, when said first detecting means detects each of said at least one proximal arterial sound, a sound detected by said second detecting means between a first and a second time point which are apart from each other and which are subsequent by respective first and second time lengths to the time of detection of said each of the at least one proximal arterial sound, as a Korotkoff sound corresponding to said each of the at least one proximal arterial sound; and

    determining means for determining at least one blood pressure value of the subject based on the collected at least one Korotkoff sound.

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