A RETINALNEUROPROSTHESISDESIGNBASEDON SIMULTANEOUS CURRENTINJECTION

We present anepiretinal neuroprosthesis design basedonahexagonally-latticed 98electrode array andthecapacity tomultiplex upto14simultaneous current sources. Thedigital andanalogue electronics required to perform this function andhowthis wouldbeincorporated intoanapplication specific integrated circuit (ASIC) are described. Simulation dataanddatafromsaline bath testing of a platinum/silicone electrode array(and associated driving electronics) arepresented. Simulations wereperformed using a2D computational modelsolved using acustomcollocation method. Theguarding affect of thehexagonal arrayisinvestigated andshowninsimple simulations to be an approach worthyof further investigation.