Electrical properties of retinal-electrode interface.
A critical element of a retinal prosthesis is the stimulating electrode array, which is placed in close proximity to the retina. It is via this retinal-electrode interface that a retinal prosthesis electrically stimulates nerve cells to produce the perception of light. The impedance load seen by the current driver consists of the tissue resistance and the complex electrode impedance. The results in this paper show that the tissue resistance of the retina is significantly greater than that of the vitreous humor in the eye. Circuit models of the electrode-retina interface are used to parameterize the different contributors to the overall impedance.
Shah
Samip
S
Department of Biomedical Engineering, Viterbi School of Engineering, University of Southern California, CA, USA.
Hines
Amy
A
Zhou
David
D
Greenberg
Robert J
RJ
Humayun
Mark S
MS
Weiland
James D
JD
D003198:Computer Simulation; D017097:Electric Impedance; D004558:Electric Stimulation / Q000295:instrumentation* / Q000379:methods; D004567:Electrodes, Implanted; D019544:Equipment Failure Analysis; D008839:Microelectrodes; D008962:Models, Theoretical; D019736:Prostheses and Implants; D012160:Retina / Q000502:physiology*; D013499:Surface Properties