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Man with bionic leg climbs skyscraper in Chicago



Published: Mon, November 5, 2012 @ 12:00 a.m.

Associated Press

CHICAGO

The metal on Zac Vawter’s bionic leg gleamed as he climbed 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 called “SkyRise Chicago” hosted by the Rehabilitation Institute of Chicago, where he is receiving treatment.

“Everything went great,” said Vawter at the event’s end. “The prosthetic leg did its part, and I did my part.”

The robotic 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 one might see in 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’ve lost arms and hands, the Chicago researchers are focusing more on lower limbs. If a bionic hand fails, a person drops a glass of water. If a bionic leg fails, a person falls down stairs.


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