Identification of the impedance model of an implanted cochlear prosthesis from intracochlear potential measurements.
IEEE Trans Biomed Eng
; 51(12): 2174-83, 2004 Dec.
Article
em En
| MEDLINE
| ID: mdl-15605865
ABSTRACT
Those suffering from a severe to profound sensorineural hearing loss can obtain substantial benefit from a cochlear implant prosthesis. An electrode array implanted in the inner ear stimulates auditory nerve fibers by direct injection of electrical current. A major limitation of today's technology is the imprecise control of intracochlear current flow, particularly the relatively wide spread of neural excitation. A better understanding of the intracochlear electrical fields is, therefore, required. This paper analyzes the structure of intracochlear potential measurements in relation to both the subject's anatomy and to the properties of the electrode array. An electrically equivalent network is proposed, composed of small lumped circuits for the interface impedance and for the cochlear tissues. The numerical methods required to estimate the model parameters from high-quality electrical potential recordings are developed. Finally, some models are presented for subjects wearing a Clarion CII device with a HiFocus electrode and discussed in terms of model reliability.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Implantes Cocleares
/
Cóclea
/
Potenciais Microfônicos da Cóclea
/
Análise de Falha de Equipamento
/
Modelos Biológicos
Tipo de estudo:
Diagnostic_studies
Limite:
Humans
Idioma:
En
Revista:
IEEE Trans Biomed Eng
Ano de publicação:
2004
Tipo de documento:
Article
País de afiliação:
Bélgica