In vitro comparison of the charge-injection limits of activated iridium oxide (AIROF) and platinum-iridium microelectrodes

Author

Cogan, Stuart F. ; Troyk, Philip R. ; Ehrlich, Julia ; Plante, Timothy D.

Author_Institution

EIC Labs. Inc., Norwood, MA, USA

Volume

52

Issue

9

fYear

2005

Firstpage

1612

Lastpage

1614

Abstract

The charge-injection limits of activated iridium oxide electrodes (AIROF) and PtIr microelectrodes with similar geometric area and shape have been compared in vitro using a stimulation waveform that delivers cathodal current pulses with current-limited control of the electrode bias potential in the interpulse period. Charge-injection limits were compared over a bias range of 0.1-0.7 V (versus Ag|AgCl) and pulse frequencies of 20, 50, and 100 Hz. The AIROF was capable of injecting between 4 and 10 times the charge of the PtIr electrode, with a maximum value of 3.9 mC/cm² obtained at a 0.7 V bias and 20 Hz frequency.

Keywords

charge injection; iridium compounds; microelectrodes; platinum compounds; 0.1 to 0.7 V; 100 Hz; 20 Hz; 50 Hz; IrO; PtIr; activated iridium oxide microelectrodes; cathodal current pulses; charge-injection limits; electrode bias potential; platinum-iridium microelectrodes; Charge transfer; Electrodes; Frequency; In vitro; Microelectrodes; Oxidation; Pulse shaping methods; Shafts; Shape control; Voltage; Charge-injection; current pulsing; iridium oxide; microelectrode; neural stimulation; platinum-iridium; Electric Impedance; Electric Stimulation; Electrostatics; Equipment Design; Equipment Failure Analysis; Iridium; Microelectrodes; Platinum Compounds;

fLanguage

English

Journal_Title

Biomedical Engineering, IEEE Transactions on

Publisher

ieee

ISSN

0018-9294

Type

jour

DOI

10.1109/TBME.2005.851503

Filename

1495706