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Conducting polymer electrodes for visual prostheses.

R A Green¹, F Devillaine, C Dodds

¹Graduate School of Biomedical Engineering, University of New South Wales, Australia. r.green@unsw.edu.au

Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual International Conference

|November 25, 2010

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Poly(ethylene dioxythiophene) (PEDOT) coatings on platinum electrodes significantly enhance neural interface performance. These conducting polymer electrodes offer superior charge transfer and lower potential excursions for retinal stimulation.

Area of Science:

Biomedical Engineering
Materials Science
Neuroscience

Background:

Conventional metal electrodes for neural interfaces have limitations in charge transfer efficiency.
Conducting polymers (CPs) offer a promising alternative for improved neural interface performance.
Poly(ethylene dioxythiophene) (PEDOT) is a well-studied CP with potential for biomedical applications.

Purpose of the Study:

To evaluate the electrical characteristics of poly(ethylene dioxythiophene) (PEDOT) coated platinum (Pt) microelectrodes.
To assess the performance of PEDOT-coated electrodes for neural stimulation in vitro and in vivo.
To determine if PEDOT coatings improve charge injection capacity and reduce potential excursions.

Main Methods:

Coating platinum microelectrode arrays with PEDOT.

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Assessing in vitro electrical characteristics using biphasic stimulation regimes.

Acute in vivo implantation of PEDOT-coated electrodes in the suprachoroidal space of a cat retina.

Measuring potential excursions and detecting electrically evoked potentials (EEPs) in the vision cortex.

Main Results:

PEDOT coatings reduced the potential excursion at the Pt electrode interface by an order of magnitude.
The charge injection limit of PEDOT was found to be 15 times larger than that of bare Pt.
In vivo, PEDOT-coated electrodes exhibited lower potential excursions.
Electrically evoked potentials (EEPs) were successfully detected in the vision cortex using PEDOT-coated electrodes.

Conclusions:

PEDOT-coated electrodes provide superior performance for neural interfaces compared to conventional Pt electrodes.
The enhanced charge transfer and reduced potential excursions offered by PEDOT are beneficial for neural stimulation.
PEDOT-coated electrodes demonstrate potential for effective retinal interfaces and detection of neural activity.