• Publications
  • Influence
Visual perception in a blind subject with a chronic microelectronic retinal prosthesis
A retinal prosthesis was permanently implanted in the eye of a completely blind test subject and the subject was able to see perceptions of light (spots) on all 16 electrodes of the array. Expand
Pattern electrical stimulation of the human retina
Experiments were conducted to study if electrical stimulation of the retinal surface can elicit visual sensation in individuals blind from end-stage retinitis pigmentosa (RP) or age-related macularExpand
In vitro electrical properties for iridium oxide versus titanium nitride stimulating electrodes
Electrochemical measurements indicated that iridium oxide had lower impedance and a higher charge storage capacity than titanium nitride, suggesting better performance as a stimulating electrode, suggesting overall more efficient and effective device. Expand
An Integrated 256-Channel Epiretinal Prosthesis
This epiretinal prosthesis system consists of a power telemetry subsystem to deliver 100 mW power, a data telemetry system to transfer 2 Mbps data, digital controllers to decode stimulation patterns, and a 256-channel stimulator to generate user programmable bi-phasic current stimuli. Expand
A neuro-stimulus chip with telemetry unit for retinal prosthetic device
In this retinal prosthesis project, a rehabilitative device is designed to replace the functionality of defective photoreceptors in patients suffering from retinitis pigmentosa (RP) and age-relatedExpand
Retinal Prosthesis
The recent clinical trials are reviewed and technology breakthroughs that will contribute to next generation of retinal prostheses are highlighted. Expand
Retinal prosthesis for the blind.
Cortical prostheses will be described only because of their direct effect on the concept and technical development of the other prostheses, and this will be done in a more general and historic perspective. Expand
Retinal stimulation strategies to restore vision: Fundamentals and systems
The progress of bioelectronic retinal implants and future devices in this genre as well as other technologies such as optogenetics, chemical photoswitches, and ultrasound stimulation are detailed. Expand
Factors affecting perceptual thresholds in epiretinal prostheses.
PURPOSE The goal was to evaluate how perceptual thresholds are related to electrode impedance, electrode size, the distance of electrodes from the retinal surface, and retinal thickness in sixExpand
An optimal design methodology for inductive power link with class-E amplifier
The design procedure starts with the formation of equivalent circuits, followed by the analysis of the loss of the rectifier and coils and the H-field for induced voltage and current and an experimental power link is implemented with an overall efficiency of 67% at the optimal distance of 7 mm between the coils. Expand