Thanks to an innovative new technological achievement, the amputated Keven Walgamott had a good "feeling" about using his new robotic hand to take an egg without it smash. What seems to be just about everyone else could be a Hercules task for Walmamoth, who lost his left hand and part of his hand in an electric accident 17 years ago. When he took the egg, he tested the prototype of a high-tech prosthetic hand with fingers that could not only move but also move with his thoughts – and thanks to a biomedical engineering team at the University of Utah. , he "felt" the egg well enough for his brain to tell the prosthetic arm not to clutch too hard.
This is because the team led by the University of Utah Biomedical Engineering Associate Professor Gregory Clark has developed a way for a "LUKE Arm" (the so-called Robbie hand that Luc Skywalker received in Star Wars: The Empire Strikes Back ] to mimic the way the human hand senses objects by sending the corresponding signals to the brain
Their findings are published in a new article co-authored by Biomedical Engineering Professor Jake George and other colleagues in the latest issue of the journal Science Robotics : – Not Wear Ant-Man Suit, but Researchers Discover How to Collapse Objects Up to 1000 Their Original Size
"We have changed the way we send this information to the brain so that it corresponds to the human body. And by comparing the human body, we have seen improved benefits, "George says," We make more realistic biological signals. "
This means that the amputees carrying the prosthetic arm can feel the touch of something soft or firm, understand how to take it, and perform delicate tasks that otherwise b ha have been impossible with a standard prosthesis with metal hooks or claws for hands
"Almost subjected me to tears," says Uolgamot for using LUKE Arm for the first time during the clinical trials in 2017. "It was really amazing. I never thought I could feel again in this hand. Kevin Walgamott and LUKE Arm – Photo from the University of Utah Center for Neural Interfaces
Walgamott, a real estate agent from West Valley City, Utah, and one of the seven Utah University participants who grabbed the grapes, without crushing them, take one egg without cracking it, and hold the hand of his wife with a feeling in his fingers, like a working man. "One of the first things she wanted to do was put on a wedding ring. It's hard to do with one hand, "says Clark.
How to achieve these things through a complex series of mathematical calculations and modeling. 19659003] LUKE Arm has been under development for about 15 years. The hand itself is made mainly of metal engines and parts with pure silicone "skin" on the arm. It is powered by an external battery and connected to a computer.
Meanwhile, the team at Utah University is developing a system that allows the prosthetic arm to engage in the user's nerves, which are like biological cables that send signals to hand to move. This is achieved thanks to an invention called the Utah sloping electrode array. Array is a bundle of 100 microelectrodes and wires that are implanted into the amputated nerves in the forearm and connected to a computer outside the body. The array interprets signals from the remaining nerves of the hand and the computer converts them into digital signals that tell the hand to move. Performing tasks like collecting objects requires more than just the brain to tell the hand to move. The prosthetic hand should also learn how to "sense" the object to understand how much pressure it exerts because you can not understand it simply by looking at it. A First Smartphone application to detect ear infections in children can save unnecessary doctor visits
First, the prosthetic hand has sensors in its hand that send signals to the nerves through Array, to imitate the sense that the hand receives in grasping something. But just as important is how these signals are sent. It involves understanding how your brain is dealing with information transitions when it first touches something. At the first contact of an object, the burst of impulses drains the nerves to the brain and then becomes thinner. The recreation of this was a big step.
"Just giving a feeling is a great deal, but the way you send this information is also crucial, and if you make it more biologically realistic, the brain will understand it better, and the effectiveness of this feeling will also be better, Clark says.
To achieve this, Clark's team uses mathematical calculations along with the recorded impulses from the primate hand to create an approximate model of how people receive these different signal patterns. This model was then introduced into the LUKE Arm system. Inspired by the high school book, scientists create a water purifier that costs only 2 cents to make
a prototype of LUKE Arm with a sense of touch, the whole team is already developing a version that is completely portable and does not need to be connected to a computer outside the body. Instead, everything will be wirelessly connected, giving the user complete freedom.
Clark says the Utah leaning electrode is also capable of sending signals to the brain for more than a touch, such as pain and fever, although the paper is mostly touching. And while their work currently includes only amputated people who have lost their limbs under the elbow where the muscles are located to move their hand, Clark says their research can also be applied to those who have lost their hands over elbow. that in 2020 or 2021, three test subjects will be able to go home to take advantage of them, pending federal regulatory approval.  Reprinted from the University of Utah
The hand in action in the video below)
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