Blood pressure pulse wave measuring devise with height calibration using absolute pressure sensor

Abstract

In this study, we report on a blood pressure pulse wave measuring device with a function to reduce the influence of height difference of body motion. Our device consists of triaxial force sensor array for measuring blood pressure pulse wave and absolute pressure sensors for measuring height of device based on heart. The height difference is converted from atmospheric pressure difference by absolute pressure sensor. Blood pressure pulse wave was calibrated by adding pressure difference converted from the height difference. We measured blood pressure pulse wave and height difference before and after lowering the wrist by 400 mm. The error of height difference was 22.2±97.8 mm. The difference of systolic blood pressure was decreased 80 % after calibration. Since difference of systolic blood pressure was decreased, we could reduce the influence of height difference of body motion.