Posts Tagged ‘prosthesis’


An array of semitransparent organic pixels on top of a ultrathin sheet of gold. The thickness of both the organic islands and the underlying gold is more than one-hundred times thinner than a single neuron.

SUMMARY: A simple retinal prosthesis is under development. Fabricated using cheap and widely-available organic pigments used in printing inks and cosmetics, it consists of tiny pixels like a digital camera sensor on a nanometric scale. Researchers hope that it can restore sight to blind people.

Researchers led by Eric Glowacki, principal investigator of the organic nanocrystals subgroup in the Laboratory of Organic Electronics, Link√∂ping University, have developed a tiny, simple photoactive film that converts light impulses into electrical signals. These signals in turn stimulate neurons (nerve cells). The research group has chosen to focus on a particularly pressing application, artificial retinas that may in the future restore sight to blind people. The Swedish team, specializing in nanomaterials and electronic devices, worked together with researchers in Israel, Italy and Austria to optimise the technology. Experiments in vision restoration were carried out by the group of Yael Hanein at Tel Aviv University in Israel. Yael Hanein’s group is a world-leader in the interface between electronics and the nervous system.

The results have recently been published in the scientific journal Advanced Materials.

The retina consists of several thin layers of cells. Light-sensitive neurons in the back of the eye convert incident light to electric signals, while other cells process the nerve impulses and transmit them onwards along the optic nerve to an area of the brain known as the “visual cortex.” An artificial retina may be surgically implanted into the eye if a person’s sight has been lost as a consequence of the light-sensitive cells becoming degraded, thus failing to convert light into electric pulses.

The artificial retina consists of a thin circular film of photoactive material, and is similar to an individual pixel in a digital camera sensor. Each pixel is truly microscopic — it is about 100 times thinner than a single cell and has a diameter smaller than the diameter of a human hair. It consists of a pigment of semi-conducting nanocrystals. Such pigments are cheap and non-toxic, and are commonly used in commercial cosmetics and tattooing ink.

“We have optimised the photoactive film for near-infrared light, since biological tissues, such as bone, blood and skin, are most transparent at these wavelengths. This raises the possibility of other applications in humans in the future,” says Eric Glowacki.

He describes the artificial retina as a microscopic doughnut, with the crystal-containing pigment in the middle and a tiny metal ring around it. It acts without any external connectors, and the nerve cells are activated without a delay.

“The response time must be short if we are to gain control of the stimulation of nerve cells,” says David Rand, postdoctoral researcher at Tel Aviv University. “Here, the nerve cells are activated directly. We have shown that our device can be used to stimulate not only neurons in the brain but also neurons in non-functioning retinas.”

https://www.sciencedaily.com/releases/2018/05/180502104043.htm

Advertisements

A French tattoo artist who lost his right arm 22 years ago recently received what has been called the world’s first tattooing prosthetic arm.

JC Sheitan Tenet, 32, told ABC News today he received and demonstrated the first prototype of the tattoo machine prosthesis earlier this month during a convention in Devezieux, France.

Though Tenet has been tattooing with his left arm and hand for years, he’s now learning how to tattoo with his right arm using the “Edward Scissorhands”-esque tool, he said.

The tattoo machine arm was created by visual artist and engineer Jean-Louis Gonzalez, who goes by “Gonzal.”

Gonzal told ABC News today that Tenet can control the prosthetic arm with his shoulder. Gonzal is still working on perfecting the prosthesis and said he hopes the next prototype will give Tenet more wrist mobility.

Tenet said that he uses the prosthesis to do a little filling but that he doesn’t rely on it to do elaborate artwork. He added that the needle is disposable and that the prosthesis can be cleaned like a regular tattoo machine.

And though the prosthesis has an oxidized metal look, it’s not rusted or unsanitary at all, Tenet said. It was painted in “steampunk style,” he explained. Steampunk is a science fiction genre and design style that typically features technology and aesthetics inspired by 19th century steam-powered machinery.