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Multi-channel stimulator IC using a channel sharing method for retinal prostheses.

Jae-Hyun Ahn¹, Sang-Min Lee, Seok-June Hong

¹ASRI/ISRC, School of Electrical Engineering and Computer Sciences, Seoul National University, Seoul, 151-742, Korea.

Journal of Biomedical Nanotechnology

|April 30, 2013

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This study introduces a novel retinal stimulator integrated circuit (IC) designed to restore vision for individuals with retinal diseases like AMD and RP. The new chip minimizes size and power consumption, enabling higher resolution for artificial retina systems.

Area of Science:

Biomedical Engineering
Neuroscience
Electrical Engineering

Background:

Retinal diseases like age-related macular degeneration (AMD) and retinitis pigmentosa (RP) cause blindness.
Artificial retina systems aim to restore vision through electrical stimulation.
High-resolution artificial retinas require advanced interface electronics.

Purpose of the Study:

To develop a new retinal stimulator integrated chip (IC).
To minimize circuit size, power consumption, and tissue overheating.
To enable higher channel counts for improved visual function.

Main Methods:

A novel channel sharing technique was employed.
A current-mode stimulator was fabricated using 0.35 microm 2-poly/4-metal BCDMOS technology.

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Design focused on minimizing silicon area for increased channel implementation.

Main Results:

The developed stimulator IC minimizes circuit size and power consumption.
The chip facilitates higher channel numbers for enhanced resolution.
Effective chip area is 1.2 mm x 1.2 mm, with output current per channel from 0-350 muA.

Conclusions:

The new retinal stimulator IC addresses the constraints of high-resolution artificial retina systems.
This technology offers a pathway to improved visual restoration for patients with retinal diseases.
The design advancements contribute to more compact and efficient retinal prosthetics.