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Compact nonlinear model of an implantable electrode array for spinal cord stimulation (SCS)

Abstract
We describe the construction of a model of the electrode-electrolyte interface and surrounding electrolyte in the case of a platinum-electrode array intended for spinal-cord stimulation (SCS) application. We show that a finite, two dimensional, resistor array provides a satisfactory model of the bulk electrolyte, and we identify the complexity required of that resistor array. The electrode-electrolyte interface is modelled in a fashion suitable for commonly-available, compact simulators using a nonlinear extension of the model of Franks et al. that incorporates diodes and a memristor. The electrode-electrolyte interface model accounts for the nonlinear current-overpotential characteristic and diffusion-limiting effects. We characterise a commercial, implantable, electrode array, fit the model to it, and show that the model successfully predicts subtle operational characteristics.
Type
Journal Article
Type of thesis
Series
Citation
Scott, J. & Single, P. (2013). Compact nonlinear model of an implantable electrode array for spinal cord stimulation (SCS). IEEE Transactions on Biomedical Circuits and System. Accepted for publication.
Date
2013
Publisher
IEEE
Degree
Supervisors
Rights
Authors’ accepted version. © 2013 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.