Italian researchers on Thursday unveiled a robotic hand they say allows users to grip objects more naturally and features a design that is to lower the price significantly.
The Hennes robotic hand has a simpler mechanical design compared with other such myoelectric prosthetics, characterized by sensors that react to electrical signals from the brain to the muscles, said researcher Lorenzo de Michieli.
He helped develop the hand in a laboratory backed by the Italian Institute of Technology and the INAIL state workers’ compensation prosthetic center.
Photo: AP
The Hennes has only one motor that controls all five fingers, making it lighter, cheaper and more able to adapt to the shape of objects.
“This can be considered low-cost because we reduce to the minimum the mechanical complexity to achieve, at the same time, a very effective grasp and a very effective behavior of the prosthesis,” De Michieli said. “We maximized the effectiveness of the prosthetics and we minimized the mechanical complexity.”
They plan to bring it to market in Europe next year with a target price of about 10,000 euros (US$11,921), about 30 percent below current market prices.
The lighter design could help overcome some resistance in users to the myoelectric hands, which to date have been too heavy for some, said Arun Jayaraman, a robotic prosthetic researcher at the Shirley Ryan AbilityLab in Chicago.
Italian researchers say the Hennes weighs about the same as a human hand.
In the US, many amputees prefer the much simpler hook prosthetic, which attaches by a shoulder harness, because it allows them to continue to operate heavy equipment, Jayaraman said.
Italian retiree Marco Zambelli has been testing the Hennes hand for the past three years. He lost his hand in a work accident while still a teenager and has used a variety of prosthetics over the years.
A video presentation shows him doing a variety of tasks, including removing bills from an automated teller machine, grasping a pencil and driving a stick-shift car.
“Driving, for example, is not a problem,” Zambelli, 64, said, who has also learned to use a knife to eat with. “Now I have gotten very good at it. I think anyone who’s not looking with an expert eye would find it difficult to spot that it’s an artificial hand.”
About a dozen labs worldwide are working on improvements to the myoelectric prosthetic, with some focusing on touch and others on improving how the nervous system communicates with the prosthetic.
“Each group is giving baby steps to help the field move forward,” Jayaraman said.
Cost remains a barrier for advanced prosthetic limbs and the more complex motorized systems tend to be “heavy and fragile. They also get hard to control,” University of Pittsburgh assistant professor of rehabilitation Robert Gaunt said.
“[The Hennes design] could make a difference. I think it is a clever approach and one that could see significant benefits for people with missing hands,” he said.
Limitations remain the inability to control individual fingers for tasks like playing the piano or typing on a computer.
However, “the vast majority of what many of us do with our hands every day is simply grasp objects,” Gaunt said.
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