By Dan Vergano, USA TODAY (Repost)
http://www.usatoday.com/news/health/story/2012-05-15/robotic-arm/55004238/1
John Donoghue of Brown University click to see the video http://theyshallwalk.org/?p=1545
A brain implant patient uses an assistive robot to drink a cup of coffee, her first self-pour in 14 years.
The demonstrations, reported in the journal Nature, mark yet another significant step in efforts by researchers to connect severely paralyzed patients to prosthetic devices that they can maneuver with their own thoughts.
The study team, headed by neuroscientist John Donoghue of Brown University and the Department of Veterans Affairs in Providence, R.I., made news in 2008, when one of the patients in the latest study, Cathy Hutchinson, 58, used brain implants to control computer cursors.
In the slowly progressing world of brain implant research, Hutchinson grabbing herself a cup of coffee for the first time in nearly 15 years , stands as the emotional highlight of the latest study, Donoghue says. “This is just a start at restoring independence to paralyzed patients.”
In the study, Hutchinson and a paralyzed 66-year-old man, both stroke victims unable to speak, controlled a right-handed robotic arm by signals sent from brain implants. The brain implants, about the size of a baby aspirin, have 100 thin wires that slightly protrude into the covering of the patients’ brains, centered over the regions connected to arm movements.
“We asked them to imagine moving their arms and the implant picks up the signal,” in brain cells, Donoghue says. Essentially a computer weighed signals from brain cells firing beneath the implant to initiate movement from the patients. But instead of making those movements in discreet directions — up, down, backward, forward and sideways — the updated program allows the robotic arm to move in a smooth curving path to touch targets. Success rates varied from 46% to 62% in grasping foam balls, using a robot arm designed by “Segway” inventor Dean Kamen with Defense Advanced Research Projects Agency (DARPA) support.
Most notably, Hutchinson’s implant has worked for six years, Donoghue says, despite fears that scarring would build up around the implants and stop their signals. “There has been some dropoff, but we think a lot of that is tied to the equipment, which was only designed to last a year,” he says. (“The warranty is over,” he jokes.)
“Immobilized patients should be encouraged by these capabilities,” says neurobiologist Andrew Schwartz of the University of Pittsburgh, who was not part of the study team. “In the future we are going to be seeing even more improvements,” says Schwartz, whose team has demonstrated similar robot arm and wrist control in monkeys . And on Monday, neurosurgeons from Washington University School of Medicine in St. Louis reported the partial restoration of finger and thumb control to a 71-year-old man paralyzed with a spinal cord injury, by rerouting an undamaged nerve in his neck to connect to arm muscles……
for the rest of the story go to http://www.usatoday.com/news/health/story/2012-05-15/robotic-arm/55004238/1
