New Wirelessly Powered Scalable Retinal Prosthesis

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New Wirelessly Powered Scalable Retinal Prosthesis

New Wirelessly Powered Scalable Retinal Prosthesis
[IMG]http://www.medgadget.com/wp-content/uploads/2017/03/na**-prosthesis.jpg[/IMG] A collaboration between researchers at University of California San Diego and Na**vision Biosciences, a university spi**ff, has developed a method for constructing Wirelessly Powered Retinal prostheses that interface directly with Retinal cells.

[IMG]http://www.medgadget.com/wp-content/uploads/2017/03/neuron-on-na**wires.jpg[/IMG]Primary cortical neurons cultured on the surface of an array of optoelectronic na**wires. Here a neuron is pulling the na**wires, indicating the the cell is doing well on this material.


The implant is structured from photosensitive silicon na**wires and, because they produce a textured surface, Retinal cells are able to grow on them. Powering the array is a **vel wireless system, that sits on the head near the eye, and provides current to all the na**wires simultaneously. *Changes in light incident onto the na**wires produces a change in the electric signal delivered to cells on the other side of the implant.

The structure of na**wires can be made to be of any size and shape, allowing it to be customized for different ocular anatomies, and the density of the na**wires is much higher than the pixel density of existing Retinal prostheses.

The new device was tested in the eyes of lab rats. Here’s a short summary according to UCSD:

For proof-of-concept, the researchers inserted the Wirelessly Powered na**wire array beneath a transgenic rat retina with rhodopsin P23H k**ck-in Retinal degeneration. The degenerated retina interfaced in vitro with a microelectrode array for recording extracellular neural action potentials (electrical “spikes” from neural activity).

The horizontal and bipolar neurons fired action potentials preferentially when the Prosthesis was exposed to a combination of light and electrical potential—and were silent when either light or electrical bias was absent, confirming the light-activated and voltage-controlled responsivity of the na**wire array.

Recent flashback:*Artificial Retina Made of Organic Photovoltaic Material Lets Blind Rats See…

Study in Journal of Neural Engineering: Towards high-resolution retinal prostheses with direct optical addressing and inductive telemetry…

Via: UCSD…

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