Patent ID: 11925442
Assignee: ARBLET INC.
Field: Medical technology (Instruments)
Classification: CPC A | IPC A

Claim 14:
15. A blood pressure information measuring method for measuring blood pressure information of a subject, comprising the following steps:
an electrocardiogram detection step of detecting an electrocardiogram of the subject by an electrocardiogram detector;
a pulse wave detection step of detecting a pulse wave of the subject by a pulse wave detector, wherein the pulse wave detected by the pulse wave detector is a plethysmogram;
a first computation step of computing, by a processor, a ventricular systolic phase pulse transit time from an R wave of an electrocardiogram waveform that is a waveform of the electrocardiogram based on a potential detected in the electrocardiogram detection step and a P wave of the pulse wave detected in the pulse wave detection step, and a ventricular diastolic phase pulse transit time from a T wave of the electrocardiogram waveform and a D wave of the pulse wave;
a second computation step of performing, by the processor, second-order differentiation of the pulse wave to compute an acceleration pulse wave; and
a third computation step of computing, by the processor, a systolic blood pressure of the subject and a diastolic blood pressure of the subject from the ventricular systolic phase pulse transit time, the ventricular diastolic phase pulse transit time, and characteristic information on the acceleration pulse wave, wherein the processor computes the systolic blood pressure using intensity ratio of an a wave and a b wave of the acceleration pulse wave computed and the ventricular systolic phase pulse transit time, and computes the diastolic blood pressure from intensity ratio of an e wave and an f wave of the acceleration pulse wave computed and the ventricular diastolic phase pulse transit time, and wherein the R wave represents state of ventricular contraction, the P wave is generated by left ventricular ejection, the T wave represents onset of ventricular dilatation, and the D wave is a reflected vibrational wave.