Patent ID: 7226418

Claim:
An automatic blood pressure measuring instrument for measuring and displaying a blood pressure of a subject in a non-invasive manner, comprising: a pressure sensor for obtaining a pulse wave signal from a wrist of the subject; a pulse wave signal processing section for amplifying, filtering, and removing noise from the pulse wave signal obtained by the pressure sensor to obtain a processed analog pulse wave signal; electrocardiogram electrodes for detecting an electrocardiogram signal of the subject; an electrocardiogram signal processing section for amplifying, filtering, and removing noise from the electrocardiogram signal detected by the electrocardiogram electrodes to obtain a processed analog electrocardiogram signal; an A/D converting section for converting the processed analog pulse wave signal and the processed analog electrocardiogram signal into a digital pulse wave signal and a digital electrocardiogram signal; a controlling section for comparing and analyzing the digital pulse wave signal and the digital electrocardiogram signal to determine parameters comprising a transition time parameter, an integral parameter, an area parameter, and a maximum amplitude parameter, and determining the blood pressure of the subject based on the transition time parameter, the integral parameter, the area parameter, and the maximum amplitude parameter; and a display for displaying the blood pressure of the subject determined by the controlling section.