CHICAGO—Zac Vawter considers himself a test pilot. After losing his right leg in a motorcycle accident, the 31-year-old software engineer signed up to become a research subject, helping to test a trailblazing prosthetic leg that’s controlled by his thoughts.
He will put this groundbreaking bionic leg to the ultimate test Sunday when he attempts to climb 103 flights of stairs to the top of Chicago’s Willis Tower, one of the world’s tallest skyscrapers.
If all goes well, he’ll make history with the bionic leg’s public debut. His whirring, robotic leg will respond to electrical impulses from muscles in his hamstring. Vawter will think, “Climb stairs,” and the motors, belts and chains in his leg will synchronize the movements of its ankle and knee. Vawter hopes to make it to the top in an hour, longer than it would’ve taken before his amputation, less time than it would take with his normal prosthetic leg—or, as he calls it, his “dumb” leg.
A team of researchers will be cheering him on and noting the smart leg’s performance. When Vawter goes home to Yelm, Washington, where he lives with his wife and two children, the experimental leg will stay behind in Chicago. Researchers will continue to refine its steering. Taking it to the market is still years away.
Bionic—or thought-controlled—prosthetic arms have been available for a few years, thanks to pioneering work done at the Rehabilitation Institute. With leg amputees outnumbering people who’ve lost arms and hands, the Chicago researchers are focusing more on lower limbs. Safety is important. If a bionic hand fails, a person drops a glass of water. If a bionic leg fails, a person falls down stairs.
The Willis Tower climb will be the bionic leg’s first test in the public eye, said lead researcher Levi Hargrove of the institute’s Center for Bionic Medicine. The climb, called “SkyRise Chicago,” is a fundraiser for the institute with about 2,700 people climbing. This is the first time the climb has played a role in the facility’s research.
To prepare, Vawter and the scientists have spent hours adjusting the leg’s movements. On one recent day, 11 electrodes placed on the skin of Vawter’s thigh fed data to the bionic leg’s microcomputer. The researchers turned over the “steering” to Vawter.
He kicked a soccer ball, walked around the room and climbed stairs. The researchers beamed.
Vawter likes the bionic leg. Compared to his regular prosthetic, it’s more responsive and more fluid. As an engineer, he enjoys learning how the leg works.
Hargrove’s inspiration came not from fiction, but from his fellow Canadian Terry Fox, who attempted a cross-country run on a regular artificial leg to raise money for cancer research in 1980.
“I’ve run marathons, and when you’re in pain, you just think about Terry Fox who did it with a wooden leg and made it halfway across Canada before cancer returned,” Hargrove said.
The $8 million project is funded by the U.S. Department of Defence and involves Vanderbilt University, the Massachusetts Institute of Technology, the University of Rhode Island and the University of New Brunswick.