Prosthetic Arms with Controlled Sensory Feedback
Author: University of Illinois at Urbana-Champaign
Published: 2018/04/27 - Updated: 2026/05/30
Publication Type: Research, Study, Analysis
Contents: Synopsis - Definition - Introduction - Main - Insights, Updates - Related Publications
Synopsis: This research, described in a paper published in the journal Science Robotics, reports on a control algorithm developed by University of Illinois researchers that regulates the electrical current behind sensory feedback in prosthetic arms, so users feel a steady sense of touch even when sweat builds up or the skin electrodes begin to peel away. The work is authoritative because it comes from a peer-reviewed study led by Aadeel Akhtar and principal investigator Timothy Bretl and was supported by the National Institutes of Health and the National Science Foundation, addressing two long-standing technical problems that have made existing sensory feedback unreliable and at times painful. For people with limb loss, seniors, and others in the disability community, the findings are useful because steady, dependable feedback could meaningfully improve quality of life and move prosthetic hands closer to feeling like a natural part of the body rather than an external tool.
At a Glance
- 1 - The controller keeps feedback steady even when the skin electrodes are up to 75 percent peeled off, preventing the painful current buildup that can otherwise shock users.
- 2 - Two patient volunteers tested the module during everyday activities like climbing stairs, hammering a nail, and running on an elliptical, and reported they could still feel sensation afterward only when the algorithm was active.
- 3 - Researchers aim to shrink the stimulation module so it fits inside the prosthetic arm, and Akhtar's goal is for the added feature to be fully covered by insurance at no out-of-pocket cost.
- Topic Definition: Sensory Feedback Prosthetics
Sensory feedback prosthetics are artificial limbs designed not only to move but also to give the wearer a sense of touch, by using sensors in the fingertips that convert physical contact into mild electrical signals delivered to the nerves through the skin. A light touch produces a gentle sensation while a firmer press produces a stronger one, allowing the user to gauge how much pressure the limb is applying. The central aim of this approach is to make a prosthetic hand feel less like a separate tool and more like a genuine extension of the body, though delivering that feedback consistently has been difficult because everyday issues such as sweat or electrodes peeling away from the skin can weaken, distort, or even painfully amplify the signal.
Introduction
Prosthetic Arms Stimulate Nerves with Controlled Sensory Feedback
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," he said.
Main Content
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 peeled off.
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," Akhtar said.
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.
The paper "Controlling sensation intensity for electrotactile stimulation in human-machine interfaces" is available online.
Insights, Analysis, and Developments
Editorial Note: What makes this work notable is its focus on a problem that sounds mundane but matters enormously in daily life: keeping a sense of touch from quietly failing the moment a user starts to sweat or the hardware shifts. Restoring sensation is only half the challenge; making that sensation reliable hour after hour is what separates a laboratory demonstration from something a person can actually live with. By tackling the gap between promising technology and dependable everyday use, the Illinois team points toward prosthetics that users can trust to hold something as delicate as a child's hand - a reminder that the future of assistive devices will be judged not only by what they can do, but by how steadily they do it.Attribution/Source(s): This quality-reviewed publication was selected for publishing by the editors of Disabled World (DW) due to its relevance to the disability community. Originally authored by University of Illinois at Urbana-Champaign and published on 2018/04/27, this content may have been edited for style, clarity, or brevity.