In-service characterization of a polymer wick-based quasi-dry electrode for rapid pasteless electroencephalography

• Tipo: Artigo em Revista Científica Internacional
• Data: 2018-05-03

Autores

C. Fonseca (Autor) FEUP; P. Pedrosa (Autor) FEUP; P. Fiedler (Autor) Outra; V. Pestana (Autor) FEUP; B. Vasconcelos (Autor) FEUP; H. Gaspar (Autor) FEUP; Maria Helena Amaral (Autor) FFUP; D. Freitas (Autor) Outra; J. Haueisen (Autor) Outra; J. M. Nóbrega (Autor) Outra

Revista

Título: Biomedical Engineering-Biomedizinische Technik

Vol. 63 Nº 4

Páginas: 349-359

ISSN: 0013-5585

Editora: Walter De Gruyter

Indexação

ISI Web of Knowledge - 18 Citações

Scopus - 17 Citações

INSPEC

Outras Informações

ID Authenticus: P-00M-X3J

DOI: 10.1515/bmt-2016-0193

Abstract (EN): 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 k Omega cm(2) 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.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 11