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Inferior-and-superior-limb blood-pressure-index measuring apparatus

  • US 6,520,919 B1
  • Filed: 06/27/2002
  • Issued: 02/18/2003
  • Est. Priority Date: 01/09/2002
  • Status: Expired due to Term
First Claim
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1. An apparatus for measuring an inferior-and-superior-limb blood-pressure index of a living subject, comprising:

  • an inferior-limb blood-pressure measuring device which includes an inferior-limb cuff adapted to be wound around a portion of an inferior limb of the subject and measures a systolic blood pressure of the inferior limb based on a heartbeat-synchronous signal which is obtained from the subject when a pressure of the inferior-limb cuff is decreased after the pressure of the inferior-limb cuff is increased up to a pressure higher than an estimated systolic blood pressure of the portion of the inferior limb;

    a superior-limb blood-pressure measuring device which includes a superior-limb cuff adapted to be wound around a portion of a superior limb of the subject and measures a systolic blood pressure of the superior limb based on a heartbeat-synchronous signal which is obtained from the subject when a pressure of the superior-limb cuff is decreased after the pressure of the superior-limb cuff is increased up to a pressure higher than an estimated systolic blood pressure of the portion of the superior limb;

    an inferior-and-superior-limb-blood-pressure-index determining means for determining the inferior-and-superior-limb blood-pressure index of the subject, based on the systolic blood pressure of the inferior limb measured by the inferior-limb blood-pressure measuring device and the systolic blood pressure of the superior limb measured by the superior-limb blood-pressure measuring device;

    an estimated-inferior-limb-systolic-blood-pressure determining means for determining the estimated systolic blood pressure of the portion of the inferior limb based on a heartbeat-synchronous signal which is obtained from the subject when the pressure of the inferior-limb cuff is increased;

    an estimated-superior-limb-systolic-blood-pressure determining means for determining the estimated systolic blood pressure of the portion of the superior limb based on a heartbeat-synchronous signal which is obtained from the subject when the pressure of the superior-limb cuff is increased; and

    a cuff-pressure control means for controlling at least one of the respective pressures of the inferior-limb cuff and the superior-limb cuff, such that when the respective pressures of the inferior-limb cuff and the superior-limb cuff are decreased, the respective pressures of the inferior-limb cuff and the superior-limb cuff become equal to the respective estimated systolic blood pressures of the inferior limb and the superior limb, at a same time.

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