Patent ID: 6986743

Claim:
An electronic blood pressure monitor comprising: a cuff configured to be mounted on a predetermined portion of a subject for pressurizing an artery of the subject; a cuff pressure controller for controlling a cuff pressure inside the cuff; a pressure detector for detecting the cuff pressure; a pulse wave detector for detecting a pulse wave of the artery that is pressured by the cuff; a wave feature calculating unit for calculating a wave feature value of the pulse wave detected by the pulse wave detector; a function memory that stores a two-parameter function having the wave feature value and a relative cuff pressure as parameters, the relative cuff pressure being a pressure difference between the detected cuff pressure and a blood pressure of the subject; a single-parameter function generating unit that generates a single-parameter function by setting the wave feature value of the two-parameter function at the calculated wave feature value of the pulse wave detected by the pulse wave detector so that the single-parameter function has the relative cuff pressure as a parameter; a relative cuff pressure determining unit that determines the relative cuff pressure corresponding to the pulse wave detected by the pulse wave detector as a maximum of the single-parameter function or a maximum of a function generated based on the single-parameter function; and a blood pressure calculating unit that calculates the blood pressure of the subject by subtracting the determined relative cuff pressure from the cuff pressure detected by the pressure detector when the pulse wave detector detects the pulse wave, wherein the cuff pressure controller maintains the cuff pressure between an upper limit and a lower limit while the pulse wave detector detects the pulse wave.