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Article

Parylene-Based Flexible Microelectrode Arrays for the Electrical Recording of Muscles and the Effect of Electrode Size

School of Electrical and Computer Engineering, University of Seoul, Seoul 02504, Korea
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Author to whom correspondence should be addressed.
Appl. Sci. 2020, 10(20), 7364; https://doi.org/10.3390/app10207364
Received: 11 August 2020 / Revised: 3 October 2020 / Accepted: 16 October 2020 / Published: 21 October 2020
(This article belongs to the Special Issue Flexible and Printed Electronics)
Miniaturized flexible microelectrode arrays are desirable for small-area surface electromyography (sEMG) to detect the electrical activity generated by muscles in a specific area of the body. Here, we present a flexible 8-channel microelectrode array with electrodes of diameter 150–300 μm for small-area sEMG recordings. The microelectrode arrays based on a flexible Parylene C substrate recorded the sEMG signals from a curved skin surface with a maximum signal-to-noise ratio (SNR) of 21.4 dB. The sEMG signals recorded from a small area of 17671–59325 μm2 showed a clear distinction between the signal and noise. Further, the sEMG data were analyzed in the frequency domain by converting the signals via fast Fourier transform (FFT), and it was verified that the proposed microelectrode could reliably record multichannel sEMGs over a small area. Moreover, a maximum voluntary contraction (MVC) experiment was performed to confirm the recording capability of the microelectrode array, which showed consistency with the previous reports. Finally, we demonstrated the effects of the electrode size by comparing the results for two different electrode sizes. When the electrode size was increased 3.37 times, the root-mean-square value of the amplitude (Vrms) increased 2.64 times, consequently increasing the SNR from 16.9 to 21.4 dB. This study demonstrates the expanded utility of Parylene-based flexible microelectrode arrays. View Full-Text
Keywords: microelectrode; electromyography; electrode size; Parylene; surface EMG microelectrode; electromyography; electrode size; Parylene; surface EMG
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MDPI and ACS Style

Choi, B.-J.; Kim, J.-H.; Yang, W.-J.; Han, D.-J.; Park, J.; Park, D.-W. Parylene-Based Flexible Microelectrode Arrays for the Electrical Recording of Muscles and the Effect of Electrode Size. Appl. Sci. 2020, 10, 7364. https://doi.org/10.3390/app10207364

AMA Style

Choi B-J, Kim J-H, Yang W-J, Han D-J, Park J, Park D-W. Parylene-Based Flexible Microelectrode Arrays for the Electrical Recording of Muscles and the Effect of Electrode Size. Applied Sciences. 2020; 10(20):7364. https://doi.org/10.3390/app10207364

Chicago/Turabian Style

Choi, Bong-Jun, Ju-Hwan Kim, Woo-Jin Yang, Dong-Jun Han, Jaewon Park, and Dong-Wook Park. 2020. "Parylene-Based Flexible Microelectrode Arrays for the Electrical Recording of Muscles and the Effect of Electrode Size" Applied Sciences 10, no. 20: 7364. https://doi.org/10.3390/app10207364

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