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TitleIn-service characterization of a polymer wick-based quasi-dry electrode for rapid pasteless electroencephalography
Author(s)Pedrosa, Paulo Eduardo Teixeira Baptista
Fiedler, Patrique
Pestana, Vanessa
Vasconcelos, Beatriz
Gaspar, Hugo
Amaral, Maria H.
Freitas, Diamantino
Haueisen, Jens
Nóbrega, J. M.
Fonseca, Carlos
Keywordsbioelectric sensors
dry electrode
hydrating solution
in-vivo impedance
polymer wick
Issue date2018
PublisherWalter de Gruyter GmbH
JournalBiomedizinische Technik
Abstract(s)A novel quasi-dry electrode prototype, based on a polymer wick structure filled with a specially designed hydrating solution is proposed for electroencephalography (EEG) applications. The new electrode does not require the use of a conventional electrolyte paste to achieve a wet, low-impedance scalp contact. When compared to standard commercial Ag/AgCl sensors, the proposed wick electrodes exhibit similar electrochemical noise and potential drift values. Lower impedances are observed when tested in human volunteers due to more effective electrode/skin contact. Furthermore, the electrodes exhibit an excellent autonomy, displaying an average interfacial impedance of 37±11 kΩ cm2 for 7 h of skin contact. After performing bipolar EEG trials in human volunteers, no substantial differences are evident in terms of shape, amplitude and spectral characteristics between signals of wick and commercial wet electrodes. Thus, the wick electrodes can be considered suitable to be used for rapid EEG applications (electrodes can be prepared without the presence of the patient) without the traditional electrolyte paste. The main advantages of these novel electrodes over the Ag/AgCl system are their low and stable impedance (obtained without conventional paste), long autonomy, comfort, lack of dirtying or damaging of the hair and because only a minimal cleaning procedure is required after the exam.
AccessRestricted access (UMinho)
Appears in Collections:IPC - Artigos em revistas científicas internacionais com arbitragem

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