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Micro and Nanosystems

Editor-in-Chief

ISSN (Print): 1876-4029
ISSN (Online): 1876-4037

Research Article

Application of Composite Distributed Electrodes in Cardiographic Sensors

Author(s): Nikolai F. Uvarov, Boris B. Bokhonov, Artem S. Ulihin, Alexander I. Titkov, Yuriy M. Yukhin, Diana K. Avdeeva and Mikhail M. Yuzhakov*

Volume 13, Issue 4, 2021

Published on: 26 January, 2021

Page: [426 - 432] Pages: 7

DOI: 10.2174/1876402913666210126145742

Price: $65

Abstract

Background: An analysis of equivalent circuits used to interpret the impedance of bioelectrode for electrocardiography shows that the best description is achieved using a double-time constant model of the skin-electrode interface. However, for the measurements, it is necessary to use equipment with high input impedance, which leads to the loss of information about the real change in the bio-potential.

Objective: The aim of the study is to comprehensively investigate and select the equivalent model that is used to interpret the impedance of a composite bioelectrode with distributed parameters.

Methods: We used theoretical and experimental research methods.

Results: It is proposed for measuring bio-potential to use Ag/AgI/Al2O3 electrodes with distributed parameters. Such electrodes are characterized by a higher contact area and their impedance is described in terms of equivalent circuits with Constant Phase Elements (CPE). It was shown that the electrode impedance is well described over a wide frequency range by an equivalent circuit typical for distributed electrodes including two CPE elements.

Conclusion: It is experimentally shown that the distributed Ag/AgI/Al2O3 electrode has at least 6 times smaller polarization contribution than a commercial Ag/AgCl cardiographic electrode. It may enable more accurate measurements of bio-potentials providing less pulse shape distortion caused by polarization of electrochemical biosensors.

Keywords: Biopotential, skin/electrode interface impedance, distributed electrode, constant phase element, AgI, bioelectrode.

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