Characterization of a non linear fractional model of electrode-tissue impedance for neuronal stimulation
Résumé
The design of neuro-stimulators must include a realistic model of electrode-tissue interface. Complex electrochemical phenomena associated to high levels of stimulation current give fractional and non linear behavior to this interface that simple linearized models fail to fit. This paper describes both a measurement protocol based on biphasic current-controlled solicitations and a modeling procedure relying on an original approach of multi-model, taking into account the non-linear and fractional effects. This model fits correctly the measurement results with current levels varying from 50μA to 1mA. Furthermore the whole characterization protocol can be safely transposed to in vivo measurements.
Mots clés
bioelectric potentials
biological tissues
biomedical electrodes
electric immittance measurement
electrochemical electrodes
neurophysiology
physiological models
biphasic current-controlled solicitations
electrochemical phenomena
electrode-tissue impedance
electrode-tissue interface model
neuronal stimulation
nonlinear fractional model
stimulation current
Artificial neural networks
Biomedical measurement
Computational modeling
Electric variables measurement
Electrodes
Fractals
Generators
Domaines
Electronique
Origine : Fichiers produits par l'(les) auteur(s)
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