Any of us that saw the 1980 sci-fi
movie “The Empire Strikes Back” will remember at the end of the
movie we see Luke Skywalker aboard the medical ship getting
his hand replaced with a realistic looking prosthetic. We were
all amazed at how Luke could feel the pain of the needle as it poked
each finger of the artificial hand. We wondered how long it would be
before actual artificial limbs would be able to restore the sensation
of touch? Apparently the answer to that question is 35 years.
Now, 35 years after that movie, DARPA
(Defense Advanced Research Project Agency) has created such an
artificial
arm that can restore the sense of touch. The arm was successfully
tested earlier this month allowing the recipient to feel the
sensation of touch after a spinal cord injury he suffered a decade
ago.
“We’ve
completed the circuit,” Justin Sanchez, Darpa program manager, said
in announcing the most recent results of the
Revolutionizing Prosthetics program earlier this month at a
conference in St. Louis, according to a
press release from
the agency.
The
arm, that was developed at John Hopkins University's Applied Physics
Laboratory, works by a sending electronic impulses through an array
of sensors that are connected directly to the brain. Those signals
are then sent through the spinal cord to the artificial limb. The
process created by the sensor array mimics the same electronic pulses
sent through a healthy nervous systems.
“Prosthetic
limbs that can be controlled by thoughts are showing great promise,
but without feedback from signals traveling back to the brain it can
be difficult to achieve the level of control needed to perform
precise movements,” he said. “By wiring a sense of touch from a
mechanical hand directly into the brain, this work shows the
potential for seamless bio-technological restoration of near-natural
function.”
After
successfully attaching the arm they tested it much the same way that
the robot medics test Luke Sywalker's hand back in that 1980 movie.
“At one point, instead of pressing one finger, the team decided to press two without telling him,” said Sanchez, who oversees the Revolutionizing Prosthetics program. “He responded in jest asking whether somebody was trying to play a trick on him. That is when we knew that the feelings he was perceiving through the robotic hand were near-natural.”
“At one point, instead of pressing one finger, the team decided to press two without telling him,” said Sanchez, who oversees the Revolutionizing Prosthetics program. “He responded in jest asking whether somebody was trying to play a trick on him. That is when we knew that the feelings he was perceiving through the robotic hand were near-natural.”