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Improved Biphasic Pulsing Power Efficiency with Pt-Ir Coated Microelectrodes

Published online by Cambridge University Press:  28 February 2014

Artin Petrossians ,
Navya Davuluri ,
John J. Whalen III ,
Florian Mansfeld  and
James D. Weiland
Artin Petrossians
Affiliation:
Mork Family Department of Chemical Engineering and Materials Science, University of Southern California, Los Angeles, California, USA Department of Ophthalmology, University of Southern California, Los Angeles, California, USA
Navya Davuluri
Affiliation:
Department of Biomedical Engineering, University of Southern California, Los Angeles, California, USA
John J. Whalen III
Affiliation:
Department of Ophthalmology, University of Southern California, Los Angeles, California, USA
Florian Mansfeld
Affiliation:
Mork Family Department of Chemical Engineering and Materials Science, University of Southern California, Los Angeles, California, USA
James D. Weiland
Affiliation:
Department of Ophthalmology, University of Southern California, Los Angeles, California, USA Department of Biomedical Engineering, University of Southern California, Los Angeles, California, USA
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Abstract

Neuromodulation devices such as deep brain stimulators (DBS), spinal cord stimulators (SCS) and cochlear implants (CIs) use electrodes in contact with tissue to deliver electrical pulses to targeted cells. In general, the neuromodulation industry has been evolving towards smaller, less invasive devices. Improving power efficiency of these devices can reduce battery storage requirements. Neuromodulation devices can realize significant power savings if the impedance to charge transfer at the electrode-tissue interface can be reduced. High electrochemical impedance at the surface of stimulation microelectrodes results in larger polarization voltages. Decreasing this polarization voltage response can reduce power required to deliver the current pulse. One approach to doing this is to reduce the electrochemical impedance at the electrode surface. Previously we have reported on a novel electrochemically deposited 60:40% platinum-iridium (Pt-Ir) electrode material that lowered the electrode impedance by two orders of magnitude or more.

This study compares power consumption of an electrochemically deposited Pt-Ir stimulating microelectrode to that of standard Pt-Ir probe microelectrode produced using conventional techniques. Both electrodes were tested using in-vitro in phosphate buffered saline (PBS) solution and in-vivo (live rat) models.

Keywords

biomaterialbiomimetic (chemical reaction)electrodeposition
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1621: Symposium H/C/D/J – Advances in Structures, Properties and Applications of Biological and Bioinspired Materials , 2014 , pp. 249 - 257
Copyright
Copyright © Materials Research Society 2014 

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