Monday, June 18, 2018

Man climbs Chicago skyscraper using bionic leg

The metal on Zac Vawter's bionic leg gleamed as he climbed the 103 floors of Chicago's iconic Willis Tower, becoming the first person ever to complete the task wearing a mind-controlled prosthetic limb.

Vawter, who lost his right leg in a motorcycle accident, put the smart limb on public display for the first time during an annual stair-climbing charity event on Sunday called "SkyRise Chicago" hosted by the Rehabilitation Institute of Chicago, where he is receiving treatment.

"Everything went great," said Vawter, who is from Yelm, Wash. "The prosthetic leg did its part, and I did my part."

The leg is designed to respond to electrical impulses from muscles in his hamstring. When Vawter thought about climbing the stairs, the motors, belts and chains in his leg synchronized the movements of its ankle and knee.

The computerized prosthetic limb, like something from a sci-fi film, weighs about 10 pounds and holds two motors.

Bionic — or thought-controlled — prosthetic arms have been available for a few years, thanks to pioneering work done at the Rehabilitation Institute. Knowing leg amputees outnumber people who have lost arms and hands, the Chicago researchers are focusing more on lower limbs.

"We were testing the leg under extreme conditions," said Joanne Smith, the Rehabilitation Institute's CEO. "Very few patients who will use the leg in the future will be using it for this purpose. From that perspective, its performance was beyond measure."

Researchers say taking the leg to the market is still years away.

The $8 million project is funded by the U.S. Department of Defense and also involves Vanderbilt University, the Massachusetts Institute of Technology, the University of Rhode Island and the University of New Brunswick.

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