Design of a Wrist-Worn Device for Simultaneous Detection of ECG and Cardiac Pulse: A Preliminary Study
Conference Paper
Overview
Research
Identity
Additional Document Info
View All
Overview
abstract
Wearable systems, such as watch/wristband systems must deal with power consumption and power line interference problems without compromising the form factor of the device and the signal-to-noise ratio (SNR). In this study, we present a preliminary design of a wrist-worn device that simultaneously detects ECG and cardiac pulse. Unlike the systems currently available in the market, the cardiac pulse is measured by detecting the magnetic disturbance caused by the blood flow in a localized magnetic field, eliminating the need to use optical sensors, which demand higher currents. The device’s circuitry was implemented using surface mount technology (SMT) on a 43.5 x 32.5 mm 4-layer PCB. With these dimensions, the contribution of electromagnetic interferences was lower than 42.5 μV when the device was used in an office setting. The main current consumption was lower than 500 μA, and the SNR was higher than 68 dB for the ECG and higher than 55 dB for the pulse signal, enabling a clear identification of the different waves of the detected signals. The aim is to simplify the signal processing algorithms in such a way that several features of the detected signals can be easily identified using fewer hardware resources.
