×

Method and apparatus for measuring change in blood pressure by respiration control

  • US 9,918,645 B2
  • Filed: 03/14/2013
  • Issued: 03/20/2018
  • Est. Priority Date: 07/27/2012
  • Status: Active Grant
First Claim
Patent Images

1. A blood pressure measuring apparatus for measuring a change in blood pressure caused by respiration control exercise, the apparatus comprising:

  • a display unit;

    an oscillometric blood pressure meter having a cuff;

    a PhotoPlethysmoGraphy (PPG) sensor;

    an ElectroCardioGram (ECG) sensor; and

    a controller configured to;

    pressurize the cuff of the oscillometric blood pressure meter and measure a first blood pressure value with the oscillometric blood pressure meter, a first pulse wave signal with the PPG sensor, and a first ECG signal with the ECG sensor;

    calculate a first pulse transit time based on the first pulse wave signal and the first ECG signal;

    draw and store a correlation equation between the first blood pressure and the first pulse transit time;

    continuously;

    measure a second pulse wave signal with the PPG sensor and a second ECG signal with the ECG sensor;

    measure a number of respirations per minute based on the second pulse wave signal measured with the PPG sensor or the second ECG signal measured with the ECG sensor;

    calculate a second pulse transit time based on the second pulse wave signal and the second ECG signal;

    determine whether the measured number of respirations per minute is greater than or equal to a predetermined number of respirations per minute;

    display, on the display unit, information for inducing respiration of the subject until the number of respirations per minute reaches the predetermined number of respirations per minute, the information including the predetermined number of respirations per minute or a difference between the predetermined number of respirations per minute and the measured number of respirations per minute;

    calculate a second blood pressure value based on the second calculated pulse transit time and the stored correlation equation, when the measured number of respirations per minute is greater than the predetermined number of respirations per minute, and output the calculated second blood pressure value; and

    measure a third pulse transit time with the PPG and ECG sensors and calculate a third blood pressure value based on the third pulse transit time and the stored correlation equation, when the measured number of respirations per minute reaches the predetermined number of respirations per minute;

    display, on the display unit, the first and third blood pressure value, after the measured number of respirations reaches the predetermined number of respirations.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×