JP2936840B

PURPOSE:To make exact blood pressure measurement by estimating the shape of the smaller max. blood pressure region from the shape of the max. blood pressure region of the pulse wave envelope obtd. from the pressure pulse wave of the larger pulse wave-generating cuff pressure when there are two peaks in the pulse wave envelope and if the differential value thereof is above a prescribed value. CONSTITUTION:The deviation (difference) DELTAPCmax of the two pulse pressure peaks P1, P2 is calculated and SYS, DIA are determined in an ordinary manner when the two pulse pressure peaks appear. The value obtd. by subtracting the DELTAPCmax from the SYS is determined as the corrected max. blood pressure value SYS'. Namely, the deviation in the pulse pressure peaks is determined as the insufficient quantity of compressing force. This insufficient quantity of the compressing force is subtracted from the max. blood pressure value determined by an ordinary calculation. The blood pressure value is calculated by estimating the shape of the max. blood pressure region of the smaller cuff pressure from the shape of the max. blood pressure region of the pressure pulse wave envelope obtd. from the pressure pulse wave of the larger pulse wave-generating cuff pressure. As a result, the blood pressure value of only the artery to which the cuff pressure is sufficiently transmitted is obtd. and the reliability of the measured blood pressure is improved.