6 results about "Retinal Prosthesis" patented technology

Organic semiconductor compositions comprising one or more pairs of organic electron donor-acceptor nanoparticle materials are described. Further described are devices comprising the organic semiconductor compositions of the present disclosure and methods of fabricating said devices. The devices have the potential to be used in the treatment of eye disease, particularly as a retinal prosthetic device.

A system and method are disclosed that supports closed-loop neuromodulation while avoiding stimulation artifact complications. Specifically, the system employs front-end spatial filtering, which removes stimulation artifacts in real time. It preserves the evoked neural responses by considering the differences in propagation speed and the spatial distribution and correlation of artifact signals. This technology can be used in various medical applications that benefit from operating in a closed-loop manner, such as pain management, motor function restoration, retinal prostheses, gastrointestinal implants, vagus nerve stimulation, sciatic nerve stimulation, and cortical neuromodulation.

The application relates to the technical field of chip circuits, in particular to a special chip ADC circuit for a retinal prosthesis, which comprises a sampling switch module, a capacitor array module, a dynamic comparator, a digital control logic module and a digital correction module; the capacitor array module comprises a P-end capacitor array and an N-end capacitor array, the P-end capacitor array comprises a plurality of first capacitors connected in parallel, and each first capacitor is connected with a first control switch; the N-end capacitor array comprises a plurality of second capacitors connected in parallel, and each second capacitor is connected with a second control switch; the same direction end of the dynamic comparator is connected with the end capacitor of the P-end capacitor array, and the reverse end of the dynamic comparator is connected with the end capacitor of the N-end capacitor array; the digital control logic module is connected with the output end of the dynamic comparator; and the digital correction module is connected with the output end of the digital control logic module. The ADC circuit provided by the application is used for converting a sensor analog signal into a digital signal and realizes low power consumption and high resolution.

Photovoltaic retinal prosthesis is provided with optically configurable confinement of electrical field. A video stream is projected onto a retinal implant. An array of photovoltaic pixels is configured to provide retinal stimulus responsive to the video stream. The photovoltaic pixels have a common return electrode. Each pixel has an active electrode that is coupled to retinal tissue via a capacitive interface or a faradaic interface. Each pixel includes photodiode(s) connected in series between the common return electrode and the corresponding active electrode. The projected video stream is configured based on a source video stream such that one or more pixels of the retinal implant that will be dark in a next frame of the projected video stream are optically preconditioned (pre-charged) by the projected video stream during the previous frame to become sufficiently conductive to act as transient local return electrodes during the next frame of the projected video stream.

An artificial prosthesis is disclosed, which comprises a pixel array, a correlated double sampling unit, an analog-to-digital converter, a digital core, and a digital-to-analog converter. The digital core is configured to perform a calculation of electrical stimulation waveform of each of the pixels by using a processing function of an ANN. As such, the neural stimulation levels for artificial vision can be optimized.