Retina Implant Ag

Alexander Dollberg

Martin Stelzle

Wilfried Nisch

Alfred Stett

Eberhart Zrenner

Bernd Höfflinger

Heinz Gerhard Graf

Hugo Haemmerle

Heinz-Gerhard Graf

Bernd Hoefflinger

Hugo Hämmerle

Bernd Höfflingen

An active retina implant has a multiplicity of pixel elements that convert incident light into electric stimulation signals for cells of the retina with which stimulation electrodes are to make contact. Each pixel element is provided with at least one image cell that converts incident light into electric signals, there being provided at least one amplifier whose input is connected to the image cell and whose output is connected to at least one stimulation electrode to which it supplies a stimulation signal. Also provided is an energy supply which provides externally coupled external energy as supply voltage for the image cells and the amplifiers. The image cell has a logarithmic characteristic according to which incident light of specific intensity is converted into electric signals of specific amplitude. The stimulation signal is supplied in the form of analog voltage pulses of specific pulse length and pulse spacings, the pulse amplitude being a function of the intensity of the incident light.

Active retina implant with a multiplicity of pixel elements

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Dortmund, Germany

Alexander Dollberg