Simulation of parallel current injection for use in a vision prosthesis

A 2D computational model was developed to simulate the distribution of voltage arising from multiple parallel current sources connected to a bipolar electrode array and immersed in a bath of physiological saline. The model was solved using a custom spectral collocation method. Pairs of electrodes placed in various locations within the bath were simulated in order to quantify return current interaction between parallel sources. A more complex electrode array geometry based on an anticipated hexagonal electrode array - to be used in a vision prosthesis - was also investigated. The guarding affect of the hexagonal array, as opposed to more traditional bipolar electrode arrangements was clearly demonstrated