A Wrist Watch-type Cardiovascular Monitoring System using Concurrent ECG and APW Measurement

Abstract

A wrist watch type wearable cardiovascular monitoring device is proposed for continuous and convenient monitoring of the patient's cardiovascular system. For comprehensive monitoring of the patient's cardiovascular system, the concurrent electrocardiogram (ECG) and arterial pulse wave (APW) sensor front-end are fabricated in 0.18 mu m CMOS technology. The ECG sensor front-end achieves 84.6-dB CMRR and 2.3-mu Vrms-input referred noise with 30-mu W power consumption. The APW sensor front-end achieves 3.2-V/Omega sensitivity with accurate bio-impedance measurement lesser than 1% error, consuming only 984-mu W. The ECG and APW sensor front-end is combined with power management unit, micro controller unit (MCU), display and Bluetooth transceiver so that concurrently measured ECG and APW can be transmitted into smartphone, showing patient's cardiovascular state in real time. In order to verify operation of the cardiovascular monitoring system, cardiovascular indicator is extracted from the healthy volunteer. As a result, 5.74 m/second-pulse wave velocity (PWV), 79.1 beats/minute-heart rate (HR) and positive slope of b-d peak-accelerated arterial pulse wave (AAPW) are achieved, showing the volunteer's healthy cardiovascular state.