High Resolution Implantable Microsystem and Probe Design for Retinal Prosthesis

High Resolution Implantable Microsystem and Probe Design for Retinal Prosthesis

By a retinal prosthesis, the researchers have been able to stimulate a limited number of neurons (around 100) by biphasic current stimulus to reproduce an image spatially by multiplexing technique. For functional restoration of sight (visual acuity 20/80), we are to stimulate at least 2500 neurons/mm². We are far behind that target. The time required by biphasic current stimulus, the sequential...

Implantable Microsystems for High-Resolution Interfacing to the Brain

Design of a high-resolution optoelectronic retinal prosthesis.

It has been demonstrated that electrical stimulation of the retina can produce visual percepts in blind patients suffering from macular degeneration and retinitis pigmentosa. However, current retinal implants provide very low resolution (just a few electrodes), whereas at least several thousand pixels would be required for functional restoration of sight. This paper presents the design of an op...

implantable microsystems for high-resolution interfacing to the brain

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Stimulator Design of Retinal Prosthesis

This study focuses on the design of electrical stimulator for retinal prosthesis. The stimulator must be designed such that the occurrence of electrolysis or any irreversible process in the electrodes and flexible lead is prevented in order to achieve safe stimulation over long periods using the large number of electrodes. Some types of biphasic current pulse circuits, charge balance circuits, ...