A novel approach to compute the impedance matrix of a cochlear implant system incorporating an electrode-tissue interface based on finite element method

Author

Choi, Charles T M ; Lai, Wei-Dian ; Lee, Sih-Sian

Author_Institution

Dept. of Electr. Eng., I-Shou Univ., Kaohsiung

Volume

42

Issue

4

fYear

2006

fDate

4/1/2006 12:00:00 AM

Firstpage

1375

Lastpage

1378

Abstract

This paper proposes to use a new and realistic finite element model of a single turn human cochlea and cochlear implant electrode array with electrode-tissue interface to model the electric field imaging technique, which creates an impedance matrix. Due to discrepancy in the Warburg capacitor in the active and nonactive electrode contacts and electric power lost along the cochlea, the diagonal terms of the impedance matrix is larger than the off diagonal terms, which represent the impedance values of the nonactive electrode contacts. The impedance matrix from electric field imaging measurements is compared with the simulation results

Keywords

biological tissues; biomedical electrodes; ear; electric fields; electric impedance measurement; finite element analysis; impedance matrix; prosthetics; Warburg capacitor; cochlear implant system; electric field imaging; electric power lost; electrode contacts; electrode-tissue interface; finite element method; impedance matrix; volume conduction model; Capacitance; Cochlear implants; Computer interfaces; Current measurement; Electrodes; Equivalent circuits; Finite element methods; Humans; Impedance measurement; Transmission line matrix methods; Cochlear implant; electric field imaging; finite element method; tissue-interface model; volume conduction model;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.2006.872461

Filename

1608471