Stimulation and Recording Electrodes for Neural Prostheses, 2015 SpringerBriefs in Electrical and Computer Engineering Series

This book provides readers with basic principles of the electrochemistry of the electrodes used in modern, implantable neural prostheses. The authors discuss the boundaries and conditions in which the electrodes continue to function properly for long time spans, which are required when designing neural stimulator devices for long-term in vivo applications. Two kinds of electrode materials, titanium nitride and iridium are discussed extensively, both qualitatively and quantitatively. The influence of the counter electrode on the safety margins and electrode lifetime in a two electrode system is explained. Electrode modeling is handled in a final chapter.

Stimulation and recording electrodes: General concepts.- Irreversible and reversible redox reactions: Water window.- Charge balance and safe operation conditions.- Primary current distribution and electrode geometry.- Experiments hardware and methods.- Electrode materials: State-of-the-art and experiments.- The effect of the counter electrode on stimulation electrode lifetime.- Electrode modeling for titanium nitride, iridium and iridium oxide microelectrodes.- Summary.

Naser Pour Aryan received the B.E. degree in electrical engineering from Ferdowsi University of Mashhad, Iran, in 2005 and the M.Sc. degree in communication technology from the University of Ulm, Germany, in 2008. He received his Ph.D. degree from the University of Ulm in December 2013. He has been working as a researcher on the retinal prosthesis project at the University of Ulm since January 2008, studying and characterizing neural stimulation electrodes. He
has had several publications on this topic. Dr. Pour Aryan’s research interests include mainly electrochemistry, analog and mixed signal circuits, modeling passive electrical structures, image processing and optics.

Hans Kaim received the Dipl.-Ing. degree in electrical engineering
from the University of Ulm, Germany, in 2013. He has been working as a researcher on the retinal prosthesis project at the University of Ulm since January 2013, investigating and characterizing neural stimulation electrodes. His research interests include electrochemistry, modeling passive electrical structures and analog and mixed signal circuits.

Albrecht Rothermel (M’90, SM’95) received the Dipl.-Ing.
degree in electrical engineering from the University of Dortmund,
and the Dr.-Ing. (Ph.D.) degree from the University of Duisburg, both Germany, in 1984 and 1989, respectively. From 1985 to 1989, he was with the Fraunhofer Institute of Microelectronic Circuits and Systems, Duisburg, Germany, working on integrated digital CMOS and BiCMOS circuits for high-speed applications. From 1990 to 1993, he was with Thomson Consumer Electronics (Thomson multimedia), Corporate Research, Villingen-Schwenningen, Germany. He worked on digital signal processing concepts for present and future TV and HDTV sets. Then as Manager of the IC design
laboratory, he was involved in analog and mixed circuit design for audio and video. Since 1994, he has been with the Institute of Microelectronics, Universityof Ulm, Germany, as