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Electrical implant helps paralyzed man in the US walk again

China Daily | Updated: 2018-09-26 09:04
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Aerial View of Snowmobilers, file photo. [Photo/VCG]

PARIS-Five years after he was paralyzed in a snowmobile accident, a man in the US has learned to walk again aided by an electrical implant, in a potential breakthrough for spinal injury sufferers.

A team of doctors at the Mayo Clinic in Minnesota say the man, using a front-wheeled walker, was able to cover the equivalent of the length of a football pitch, issuing commands from his brain to transfer weight and maintain balance-all previously thought impossible for paralyzed patients.

The man, now 29, severed his spinal cord in the middle of his back when he crashed his snowmobile in 2013. He is completely paralyzed from the waist down, and cannot move or feel anything below the middle of his torso.

In the study, the results of which were published on Monday in the journal Nature Medicine, doctors in 2016 implanted a small electronic device in the man's spine.

The wirelessly operated implant, about the size of a AA battery, generates electrical pulses to stimulate nerves that-due to the injury-had been permanently disconnected from the brain.

"What this is teaching us is that those networks of neurons below a spinal cord injury can still function after paralysis," said Kendall Lee, neurosurgeon at the Mayo Clinic and lead study author.

Within weeks of the device being switched on, the man began to take his first steps since the accident.

Astonishingly, after several more sessions of rehab and physiotherapy, he was able to support most of his own body weight and take steps on a treadmill.

"We didn't limit our expectations and continued to safely advance his performance as he gained function," said Kristin Zhao, director of the Mayo Clinic's Assistive and Restorative Technology Laboratory.

"This is important because the patient's own mind was able to drive the movement in the legs," she said.

Although the device was able to help generate power and control in the patient's lower body, it did nothing to restore sensation in his legs.

This initially proved challenging. Without the physical feeling of walking registering in his brain, it was hard for him to make the instantaneous balance adjustments most of us make without thinking.

The team overcame the problem by installing mirrors at knee height so the patient could see what position his legs were in while walking.

AFP

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