Illinois: Losing an arm doesn’t have to mean losing all sense of touch, thanks to prosthetic arms that stimulate nerves with mild electrical feedback. University of Illinois researchers have developed a control algorithm that regulates the current so a prosthetics user feels steady sensation, even when the electrodes begin to peel off or when sweat builds up.
“We’re giving sensation back to someone who’s lost their hand. The
idea is that we no longer want the prosthetic hand to feel like a tool,
we want it to feel like an extension of the body,” said Aadeel Akhtar,
an M.D./Ph.D. student in the neuroscience program and the medical scholars program
at the University of Illinois. Akhtar is the lead author of a paper
describing the sensory control module, published in Science Robotics,
and the founder and CEO of PSYONIC, a startup company that develops low-cost bionic arms.
“Commercial prosthetics don’t have good sensory feedback. This is a
step toward getting reliable sensory feedback to users of prosthetics,”
Prosthetic arms that offer nerve stimulation have sensors in the
fingertips, so that when the user comes in contact with something, an
electrical signal on the skin corresponds to the amount of pressure the
arm exerts. For example, a light touch would generate a light sensation,
but a hard push would have a stronger signal.
However, there have been many problems with giving users reliable feedback, said aerospace engineering professor Timothy Bretl,
the principal investigator of the study. During ordinary wear over
time, the electrodes connected to the skin can begin to peel off,
causing a buildup of electrical current on the area that remains
attached, which can give the user painful shocks. Alternately, sweat can
impede the connection between the electrode and the skin, so that the
user feels less or even no feedback at all.
“A steady, reliable sensory experience could significantly improve a prosthetic user’s quality of life,” Bretl said.
The controller monitors the feedback the patient is experiencing and
automatically adjusts the current level so that the user feels steady
feedback, even when sweating or when the electrodes are 75 percent
The researchers tested the controller on two patient volunteers. They
performed a test where the electrodes were progressively peeled back
and found that the control module reduced the electrical current so that
the users reported steady feedback without shocks. They also had the
patients perform a series of everyday tasks that could cause loss of
sensation due to sweat: climbing stairs, hammering a nail into a board
and running on an elliptical machine.
“What we found is that when we didn’t use our
controller, the users couldn’t feel the sensation anymore by the end of
the activity. However, when we had the control algorithm on, after the
activity they said they could still feel the sensation just fine,”
Adding the controlled stimulation module would cost much less than
the prosthetic itself, Akhtar said. "Although we don't know yet the
exact breakdown of costs, our goal is to have it be completely covered
by insurance at no out-of-pocket costs to users."
The group is working on miniaturizing the module that provides the
electrical feedback, so that it fits inside a prosthetic arm rather than
attaching to the outside. They also plan to do more extensive patient
testing with a larger group of participants.
“Once we get a miniaturized stimulator, we plan on doing more patient
testing where they can take it home for an extended period of time and
we can evaluate how it feels as they perform activities of daily living.
We want our users to be able to reliably feel and hold things as
delicate as a child's hand,” Akhtar said. “This is a step toward making a
prosthetic hand that becomes an extension of the body rather than just
being another tool.”
The National Institutes of Health and the National Science Foundation supported this work.