Patent ID: 8920328

Claim:
A blood pressure measurement apparatus, operable to vary a pressure of a cuff wound around a portion of a living body to calculate a blood pressure value, the blood pressure measurement apparatus comprising: a pressure pulse detector, operable to continuously detect pressure pulses from a signal corresponding to the pressure of the cuff, the pressure pulses including a first pulse, a second pulse prior to the first pulse and a third pulse prior to the second pulse which are detected under the same pressure; a controller including a central processing unit configured to execute a blood pressure detecting program including the operations of determining a waveform amplitude of the first pulse (A1), a waveform amplitude of the second pulse (A2), a waveform amplitude of the third pulse (A3), an interval between the first pulse and the second pulse (T12) and an interval between the second pulse and the third pulse (T23); distinguishing whether or not the waveforms amplitudes of the first pulse and the second pulse are substantially identical with each other; distinguishing, when the waveform amplitudes are not substantially identical with each other, whether or not relationships between parameters of the first pulse, the second pulse and the third pulse meet a condition related to arrhythmia; determining the first pulse and the second pulse to be pulse waves when the waveform amplitudes are substantially identical with each other, and determining the first pulse, the second pulse and the third pulse to be pulse waves when the parameters meet the condition, and calculating the blood pressure value based on the pulse waves determined by the controller.