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Posted by Sco on September 14, 2006, 11:31 pm
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DAYTON, TENN. - Jesse Sullivan has two prosthetic arms, but he can climb a
ladder at his house and roll on a fresh coat of paint. He's also good with a
weed-whacker, bending his elbow and rotating his forearm to guide the
machine. He's even mastered a more sensitive maneuver - hugging his
grandchildren.
The motions are coordinated and smooth because his left arm is a bionic
device controlled by his brain. He thinks, "Close hand," and electrical
signals sent through surgically re-routed nerves make it happen.
Doctors describe Sullivan as the first amputee with a thought-controlled
artificial arm.
Researchers encouraged Sullivan, who became an amputee in an industrial
accident, not to go easy on his experimental limb.
"When I left, they said don't bring it back looking new," the 59-year-old
Sullivan said with a grin, his brow showing sweat beneath a fraying
Dollywood amusement park cap. At times he has been so rough with the bionic
arm that it has broken, including once when he pulled the end off starting a
lawnmower.
Testing prosthetic for soldiers
That prompted researchers to make improvements, part of a U.S. government
initiative to refine artificial limbs that connect body and mind. The
National Institutes of Health has supported the research, joined more
recently by the military's research-and-development wing, the Defense
Advanced Research Projects Agency. Some 411 U.S. troops in Iraq and 37 in
Afghanistan have had wounds that cost them at least one limb, the Army
Medical Command says.
Although work that created Sullivan's arm preceded the research by DARPA, he
said he's proud to test a type of bionic arm that soldiers could someday
use. "Those guys are heroes in my book," he said, "and they should have the
best there is."
"We're excited about collaborating with the military," said the developer of
Sullivan's arm, Dr. Todd Kuiken, director of neuroengineering at the Center
for Artificial Limbs at the Rehabilitation Institute of Chicago, one of 35
partners now in a DARPA project to develop a state-of-the-art arm.
Sullivan's bionic arm represents an advance over typical artificial arms,
like the right-arm prosthesis he uses, which has a hook and operates with
sequential motions. There is no perceivable delay in the motions of Sullivan's
flesh-colored, plastic-like left arm. Until now, it has been nearly
impossible to recreate the subtle and complex motion of a human arm.
"It is not as smooth as a normal arm but it works much smoother than a
normal prosthesis," Kuiken said.
Sullivan lost his arms in May 2001 working as a utility lineman. He suffered
electrical burns so severe that doctors had to amputate both his arms at the
shoulder.
Seven weeks later, due to what Sullivan calls being in the right place at
the right time, he was headed to meet the Chicago researchers.
"Jesse is an absolutely remarkable human being, with or without his
injuries," Kuiken said.
'It's not magic'
Sullivan said his bionic arm isn't much like the one test pilot Steve Austin
got in the '70s TV series "The Six Million Dollar Man." "I don't really feel
superhuman or anything," he said.
"It's not magic," added his 4-year-old grandson, Luke Westlake, as he placed
a nut in Sullivan's grip and challenged Paw-Paw to crack it open.
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