The Ausculatory and the Oscillometric are the most commonly used blood pressure measurement methods worldwide. However, the ausculatory method requires professionally trained observers and is not suitable for automatic BP measurement; while the oscillometric method is less accurate in wide age groups. A new BP measurement method is introduced here which determines the subject’s BP value by features of the waveform measured by a strain sensor on the arm skin. During the cuff based measurement process, blood pulses in the brachial artery lead to artery deformations, which transfer to the arm surface in the form of surface strain and to the cuff in the form of cuff pressure oscillation. Since the cuff volume and amount of air keeps changing during the measurement, arm surface strain changes are more related to blood pulse. A piezoelectric film strain sensor is placed on the arm surface above the brachial artery to measure the surface strain. Since the artery closure statuses are different during the BP measurement process, the unique features of the measured waveform are observed in our previous study. Using these features, the subject’s BP can be determined. The analysis of these features and their relation to the subject’s BP are illustrated in this paper.

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