Prosthetic Leg
with Neurofeedback Makes Walking Easier, Treats Phantom Pain
Today’s
Prosthetic legs come in a variety of designs, but they lack the ability to give users a natural sense of themselves. They feel simply like man-made devices strapped to the stump, as tools and not as part of the body of whoever wears them. Researchers from ETH Zurich, University of Freiburg, University of Belgrade, and the companies SensArs and "Ossur, have combined their expertise in a variety of topics to give existing commercial
Prosthetic legs a sense of touch.
SensArs, a Swiss firm, is behind an interface that can link a prosthesis
with residual nerves in the thigh and create a
Neurofeedback mechanism. Two patients
with an above-the-knee amputation had the neurostimulation system implanted at the University of Belgrade. Following calibration and after a period of initial usage, the two volunteers demonstrated significant improvements in their
Walking ability, including traversing a sandy surface
with a much more natural gait.
“This proof-of-concept study shows how beneficial it is to the health of leg amputees to have a prosthesis that works
with neural implants to restore sensory feedback,” said Stanisa Raspopovic, a Professor at the Institute of Robotics and Intelligent Systems at ETH Zurich.
A commercially available leg from "Ossur was used, which was outfitted
with pressure sensors on its sole, as well as around the knee to know where in the gait the leg is at all times. The electrodes and neurostimulator were then implanted into the volunteers and the tissues were allowed to heal around.
Subsequently, the researchers studied which signals best match the natural feeling of
Walking and allowed those to be transmitted to the neurostimulator and onto the residual nerves toward the brain. The volunteers were able to sense their legs and didn’t have to constantly look at them to make sure everything was going well. Moreover, they spent a lot less energy walking, as measured by oxygen consumption, and mentally they were not as tired, as confirmed by measuring brain activity.
One not entirely surprising finding, but a very welcome one, is that
Phantom limb
Pain was significantly reduced in one of the volunteers and completely gone in the other. As this affects a great deal of amputees, the new technique may be used to treat that condition.
Here’s a video from ETH Zurich about the new technology:
Study in
Nature Medicine:
Sensory feedback restoration in leg amputees improves walking speed, metabolic cost and phantom pain
Via:
ETH Zurich
