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Blood-pressure measuring apparatus

  • US 6,589,186 B2
  • Filed: 03/04/2002
  • Issued: 07/08/2003
  • Est. Priority Date: 10/09/2001
  • Status: Expired due to Fees
First Claim
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1. An apparatus for measuring a blood pressure of a living subject, comprising:

  • an inflatable cuff which is adapted to be worn on a body portion of the subject and which applies a pressure to the body portion of the subject;

    a cuff-pressure changing device which changes the pressure of the cuff between a first pressure lower than a systolic blood pressure of the body portion of the subject and higher than a mean blood pressure of the body portion, and a second pressure lower than a diastolic blood pressure of the body portion;

    a blood-pressure determining device which determines a diastolic blood pressure and a mean blood pressure of the subject based on a heartbeat-synchronous signal which is detected from the subject while the cuff-pressure changing device changes the pressure of the cuff;

    a cuff-pulse-wave detecting device which detects a cuff pulse wave as an oscillation of the pressure of the cuff;

    a pulse-wave-magnitude determining means for operating the cuff-pressure changing device to maintain the pressure of the cuff at a third pressure lower than the mean blood pressure of the body portion of the subject, and determining a minimal magnitude, a mean magnitude, and a maximal magnitude of the cuff pulse wave detected by the cuff-pulse-wave detecting device in a state in which the pressure of the cuff is maintained at the third pressure; and

    a systolic-blood-pressure determining means for determining a systolic blood pressure of the subject, based on the diastolic and mean blood pressure determined by the blood-pressure determining device and the minimal, mean, and maximal magnitudes of the cuff pulse wave determined by the pulse-wave-magnitude determining means, according to a fact that the minimal, mean, and maximal magnitudes of the cuff pulse wave correspond to the diastolic, mean, and systolic blood pressure of the subject, respectively.

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