Patent ID: 9706933
Date: 2017-07-18
CPC Classifications: A61B

Claim:
1. A blood pressure measurement device comprising: a fluid bladder; a pressurizing unit for pressurizing the fluid bladder by injecting a fluid into the fluid bladder; a depressurizing unit for depressurizing the fluid bladder by discharging the fluid from the fluid bladder; a sensor for measuring an internal pressure change of the fluid bladder; a blood pressure measurement unit for calculating a blood pressure value based on the internal pressure change of the fluid bladder obtained by the sensor in the depressurizing process in which the depressurizing unit discharges the fluid from the fluid bladder; and a control unit for controlling the pressurizing unit, the depressurizing unit, and the blood pressure measurement unit, wherein the depressurizing unit includes only one valve arranged on the fluid bladder, so that a gap of an opening on the fluid bladder is controlled by the one valve, wherein the gap of the one valve is controlled by a drive voltage, wherein the control unit includes an acquisition unit for obtaining information about a perimeter of a measuring portion, wherein the control unit determines the drive voltage of the one valve according to the perimeter so that the gap is set to a constant determined gap with respect to the obtained perimeter, wherein the control unit controls the gap of the one valve to be maintained constant at the constant determined gap during the depressurizing process, resulting in rapid deflation at a beginning of the depressurizing process and slow deflation at an end of the depressurizing process, and wherein the constant determined gap changes relatively to the perimeter such that the constant determined gap becomes great as the perimeter becomes large.