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Flexible Multi-Layer Semi-Dry Electrode for Scalp EEG Measurements at Hairy Sites

One of the major challenges of daily wearable electroencephalogram (EEG) monitoring is that there are rarely suitable EEG electrodes for hairy sites. Wet electrodes require conductive gels, which will dry over the acquisition time, making them unstable for long-term EEG monitoring. Additionally, the...

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Autores principales: Hua, Haoqiang, Tang, Wei, Xu, Xiangmin, Feng, David Dagan, Shu, Lin
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2019
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6722968/
https://www.ncbi.nlm.nih.gov/pubmed/31382695
http://dx.doi.org/10.3390/mi10080518
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author Hua, Haoqiang
Tang, Wei
Xu, Xiangmin
Feng, David Dagan
Shu, Lin
author_facet Hua, Haoqiang
Tang, Wei
Xu, Xiangmin
Feng, David Dagan
Shu, Lin
author_sort Hua, Haoqiang
collection PubMed
description One of the major challenges of daily wearable electroencephalogram (EEG) monitoring is that there are rarely suitable EEG electrodes for hairy sites. Wet electrodes require conductive gels, which will dry over the acquisition time, making them unstable for long-term EEG monitoring. Additionally, the electrode–scalp impedances of most dry electrodes are not adequate for high quality EEG collection at hairy sites. In view of the above problems, a flexible multi-layer semi-dry electrode was proposed for EEG monitoring in this study. The semi-dry electrode contains a flexible electrode body layer, foam layer and reservoir layer. The probe structure of the electrode body layer enables the electrode to work effectively at hairy sites. During long-term EEG monitoring, electrolytes stored in the reservoir layer are continuously released through the foam layer to the electrode–scalp interface, ensuring a lower electrode–scalp contact impedance. The experimental results showed that the average electrode–scalp impedance of the semi-dry electrode at a hairy site was only 23.89 ± 7.44 KΩ at 10 Hz, and it was lower than 40 KΩ over a long-term use of 5 h. The electrode performed well in both static and dynamic EEG monitoring, where the temporal correlation with wet electrode signals at the hairy site could reach 94.25% and 90.65%, respectively, and specific evoked EEG signals could be collected. The flexible multi-layer semi-dry electrode can be well applied to scalp EEG monitoring at hairy sites, providing a promising solution for daily long-term monitoring of wearable EEGs.
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spelling pubmed-67229682019-09-10 Flexible Multi-Layer Semi-Dry Electrode for Scalp EEG Measurements at Hairy Sites Hua, Haoqiang Tang, Wei Xu, Xiangmin Feng, David Dagan Shu, Lin Micromachines (Basel) Article One of the major challenges of daily wearable electroencephalogram (EEG) monitoring is that there are rarely suitable EEG electrodes for hairy sites. Wet electrodes require conductive gels, which will dry over the acquisition time, making them unstable for long-term EEG monitoring. Additionally, the electrode–scalp impedances of most dry electrodes are not adequate for high quality EEG collection at hairy sites. In view of the above problems, a flexible multi-layer semi-dry electrode was proposed for EEG monitoring in this study. The semi-dry electrode contains a flexible electrode body layer, foam layer and reservoir layer. The probe structure of the electrode body layer enables the electrode to work effectively at hairy sites. During long-term EEG monitoring, electrolytes stored in the reservoir layer are continuously released through the foam layer to the electrode–scalp interface, ensuring a lower electrode–scalp contact impedance. The experimental results showed that the average electrode–scalp impedance of the semi-dry electrode at a hairy site was only 23.89 ± 7.44 KΩ at 10 Hz, and it was lower than 40 KΩ over a long-term use of 5 h. The electrode performed well in both static and dynamic EEG monitoring, where the temporal correlation with wet electrode signals at the hairy site could reach 94.25% and 90.65%, respectively, and specific evoked EEG signals could be collected. The flexible multi-layer semi-dry electrode can be well applied to scalp EEG monitoring at hairy sites, providing a promising solution for daily long-term monitoring of wearable EEGs. MDPI 2019-08-04 /pmc/articles/PMC6722968/ /pubmed/31382695 http://dx.doi.org/10.3390/mi10080518 Text en © 2019 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Hua, Haoqiang
Tang, Wei
Xu, Xiangmin
Feng, David Dagan
Shu, Lin
Flexible Multi-Layer Semi-Dry Electrode for Scalp EEG Measurements at Hairy Sites
title Flexible Multi-Layer Semi-Dry Electrode for Scalp EEG Measurements at Hairy Sites
title_full Flexible Multi-Layer Semi-Dry Electrode for Scalp EEG Measurements at Hairy Sites
title_fullStr Flexible Multi-Layer Semi-Dry Electrode for Scalp EEG Measurements at Hairy Sites
title_full_unstemmed Flexible Multi-Layer Semi-Dry Electrode for Scalp EEG Measurements at Hairy Sites
title_short Flexible Multi-Layer Semi-Dry Electrode for Scalp EEG Measurements at Hairy Sites
title_sort flexible multi-layer semi-dry electrode for scalp eeg measurements at hairy sites
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6722968/
https://www.ncbi.nlm.nih.gov/pubmed/31382695
http://dx.doi.org/10.3390/mi10080518
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