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Conformable Wearable Electrodes: From Fabrication to Electrophysiological Assessment

Conformable Wearable Electrodes: From Fabrication to Electrophysiological Assessment

Published on: July 22, 2022

Non-contact ECG sensing employing gradiometer electrodes.

GuoChen Peng¹, Mark F Bocko

¹Electrical and Computer Engineering Department, University of Rochester, Rochester, NY 14627-0231, USA. gupeng@ece.rochester.edu

IEEE Transactions on Bio-Medical Engineering

|September 26, 2012

Summary

Motion artifacts in noncontact capacitive electrocardiogram (ECG) measurements are reduced using novel gradiometer electrode designs. Second-order gradiometers offer superior performance, minimizing beat detection errors compared to standard methods.

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Area of Science:

Biomedical Engineering
Signal Processing
Wearable Health Technology

Background:

Noncontact capacitive electrocardiogram (ECG) measurements are susceptible to motion artifacts due to electrode-subject movement.
These artifacts significantly complicate accurate ECG signal acquisition and analysis.

Purpose of the Study:

To develop and evaluate novel gradiometer electrode designs for motion artifact compensation in capacitive ECG.
To compare the performance of first and second-order gradiometer designs against standard ECG methods.

Main Methods:

Developed a MATLAB-based simulation tool for assessing electrode configurations.
Experimental validation using human subjects to measure sensitivity, motion artifact cancellation, and common mode rejection.
Compared gradiometer designs with standard ECG recording using an open-source beat detection algorithm.

Main Results:

Second-order gradiometer electrode designs demonstrated superior performance, indicated by a higher signal-to-noise-plus-distortion ratio.
Both gradiometer designs exhibited less than 1% beat detection mismatch compared to standard ECG methods.

Conclusions:

First and second-order gradiometer electrode designs effectively compensate for motion artifacts in capacitive ECG.
Second-order gradiometers provide the best performance for robust, noncontact ECG monitoring.