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Feasibility Study of a 1000+ Electrode Array in Epiretinal Prosthesis

Diego Luján Villarreal, Dietmar Schroeder, and Wolfgang H. Krautschneider
Institute of Nano and Medical Electronics, Hamburg University of Technology, Hamburg, Germany
Abstract—To improve resolution and achieve functional vision, it is required 1000 electrodes with minimum feature size at epiretinal prosthetic devices. This challenging aim, however, has a limitation as to accommodate 1000+ electrode array and be within the limits of charge density and temperature increase at the device. In this work, we simulated a ganglion cell ON-model with PEDOT-NaPSS arranged electrode array in a three-dimensional retina model using COMSOL-Matlab interface. We varied electrode size, pulse width and inter electrode-ganglion cell distance to analyze charge density and temperature increase at the device. With our results, we investigated the feasibility of using 1024 electrode array attaching 16 scalable chips of 64 electrodes each with a daisy chain configuration. For IEGD less than 10 μm, it is feasible to use 1024 array of electrodes with the following requirements: i) reduce electrode diameter to 2μm; ii) maximum output voltage of 1 V; iii) work with either 50 or 100μs low pulse duration; iv) 11.3mm2 electrode carrier area; v) PEDOT-NaPSS electrode deposition and vi) circular electrodes. 
 
Index Terms—ganglion cell model, ionic current model, 1000 electrode array retinal prosthesis, electrode dimension limit

Cite: Diego Luján Villarreal, Dietmar Schroeder, and Wolfgang H. Krautschneider, "Feasibility Study of a 1000+ Electrode Array in Epiretinal Prosthesis," International Journal of Pharma Medicine and Biological Sciences, Vol. 5, No. 3, pp. 163-170, July 2016. 10.18178/ijpmbs.5.3.163-170
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