Characterization and variability of intracortical iridium oxide microelectrodes

Author

Cogan, S.F. ; Troyk, P.R. ; Detlefsen, D.E. ; Ehrlich, J. ; Plante, Timothy D. ; McCreery, Douglas B. ; Bullara, L. ; Bak, M.

Author_Institution

EIC Labs. Inc., Norwood, MA, USA

Volume

2

fYear

2003

fDate

17-21 Sept. 2003

Firstpage

1976

Abstract

Over 200 iridium microelectrodes with activated iridium oxide (AIROF) charge-injection sites were evaluated in vitro by cyclic voltammetry and voltage transient measurements during current pulsing. Variability in the electrochemical behavior of these nominally identical microelectrodes was correlated with variations in the amount of AIROF present and the physical condition of the charge-injection tip. Electrolyte leakage under polymer insulation and delamination of AIROF both gave rise to characteristic shapes in cyclic voltammograms which could be used to identify their presence.

Keywords

biomedical electrodes; brain; charge injection; electrochemical electrodes; iridium compounds; microelectrodes; neurophysiology; polymer insulators; transients; variable rate codes; voltammetry (chemical analysis); IrO; charge-injection sites evaluation; current pulsing; cyclic voltammetry; electrochemical behavior; electrolyte leakage; intracortical activated iridium oxide microelectrodes; polymer insulation; variability; voltage transient measurements; Current measurement; Electrodes; Etching; Indium; Laboratories; Medical diagnostic imaging; Microelectrodes; Shafts; Voltage measurement; Wire;

fLanguage

English

Publisher

ieee

Conference_Titel

Engineering in Medicine and Biology Society, 2003. Proceedings of the 25th Annual International Conference of the IEEE

ISSN

1094-687X

Print_ISBN

0-7803-7789-3

Type

conf

DOI

10.1109/IEMBS.2003.1279837

Filename

1279837