Active retina implant with a multiplicity of pixel elements
First Claim
1. An active retina implant with 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 havingat least one image cell that converts incident light into electric signals, andat 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,and with an energy supply which converts externally coupled external energy into a supply voltage for the image cells and the amplifiers,wherein the image cell has a logarithmic characteristic according to which incident light of specific intensity is converted into electric signals of specific amplitude,wherein each pixel element has a logarithmic image cell for local image brightness, and each pixel element is assigned at least one logarithmic image cell for global brightness, andwherein the amplifier is designed as a differential amplifier of which one input is connected to the image cell for local image brightness, and of which the other input is connected to the image cell for global brightness.
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Accused Products
Abstract
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.
98 Citations
22 Claims
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1. An active retina implant with 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 having at least one image cell that converts incident light into electric signals, and 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, and with an energy supply which converts externally coupled external energy into a supply voltage for the image cells and the amplifiers, wherein the image cell has a logarithmic characteristic according to which incident light of specific intensity is converted into electric signals of specific amplitude, wherein each pixel element has a logarithmic image cell for local image brightness, and each pixel element is assigned at least one logarithmic image cell for global brightness, and wherein the amplifier is designed as a differential amplifier of which one input is connected to the image cell for local image brightness, and of which the other input is connected to the image cell for global brightness.
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11. An active retina implant with a number 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 having at least one image cell that converts incident light of specific intensity into electric signals, and 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, and with an energy supply which converts externally coupled external energy into a supply voltage for the image cells and the amplifiers, wherein 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, and wherein pulse length and pulse spacing are determined via the externally coupled external energy.
Specification