Patent ID: 9596996
Date: 2017-03-21
CPC Classifications: A61B

Claim:
1. A blood pressure measurement device comprising: a fluid bag; an inflation unit that injects fluid into the fluid bag and inflates the fluid bag; a deflation unit comprising a voltage controlled valve provided in the fluid bag, and that discharges fluid from the fluid bag and deflates the fluid bag, a sensor that measures a change in internal pressure of the fluid bag; a blood pressure measurement unit that calculates a blood pressure value, based on the change in internal pressure of the fluid bag obtained by the sensor in a deflation process of discharging fluid from the fluid bag by the deflation unit; and a central processing unit (CPU) that controls the inflation unit, the deflation unit and the blood pressure measurement unit, wherein the CPU controls the inflation unit to inflate the fluid bag to reach a predetermined maximum pressure, calculates within a predetermined adjustment period, which is before reaching a point at which a systolic blood pressure is measured, and which is during the deflation process, a drive voltage to be applied to the voltage controlled valve to cause the deflation unit to deflate the fluid bag at a deflation speed that is a predetermined deflation speed given by a predetermined pressure change per unit time, and maintains, during a drive voltage fixed period occurring after the predetermined adjustment period, the drive voltage at a fixed value equal to the calculated drive voltage.