Researcher develops an affordable helping hand for stroke recovery

For millions of stroke survivors, something as simple as picking up a glass of water or holding a sandwich is a daily challenge. Quentin Sanders wants to make those moments easier through wearable robotic technology designed to restore hand function.

The George Mason University assistant professor is developing a new generation of hand exoskeletons that may help people regain independence after stroke. His lab is testing wearable devices that amplify a user’s remaining muscle activity, allowing them to open and close their hand more effectively while remaining affordable enough for broader use.

The latest prototype resembles a lightweight glove that fits over the hand and upper arm. As users attempt to move their hand, the device detects their remaining muscle activity and assists the motion.

“We instruct them to try to open their hand,” Sanders explained. “When they try to open their hand, we sense whatever residual activity they have, and then the exoskeleton amplifies that.”

One version of the device seeks to use wearable ultrasound technology developed in collaboration with George Mason researcher Siddhartha Sikdar, a professor in the Department of Bioengineering and director of the Center for Medtech Innovation. The system will use wearable ultrasound sensors to monitor how muscles deform as they contract, translating those signals into movement. Another, simpler version uses a button embedded in the glove that users press to control the device.

While brain-controlled devices remain the long-term aspiration for many in the field, Sanders is focused on a more practical solution that builds on the muscle activity people retain after a stroke. “I would say brain-controlled systems are kind of the holy grail. In my lab, we’re going one level lower to see if we can use muscle activity to control it.”

The need for better rehabilitation tools is growing. Sanders noted that roughly 800,000 people experience a stroke each year in the United States, while millions more live with its long-term effects. Advances in medicine mean more people survive strokes, but many struggle to access the lengthy rehabilitation needed to regain function.

“We’re at this point where you’re living a long life, but you have this need for rehab,” Sanders said. “You need either consistent opportunities for movement or some type of device that can help improve your quality of life.”

Commercial hand exoskeletons remain scarce in the United States, and many existing systems cost tens of thousands of dollars. Making the technology more affordable and accessible has become one of the driving goals of his research.

“You’ve got this large population of people who need these devices who aren’t getting them,” Sanders said. “I’m hoping we can make this kind of a low-cost, accessible version that people can use to improve some aspect of their life.”

Sanders is also working to broaden who can benefit from rehabilitation technologies. Many research studies enroll only patients who meet narrow eligibility criteria, leaving others without solutions tailored to their needs.

“I think that’s the other breakthrough people are working on that my lab is working on,” he said. “How can we make these devices work for a larger population?”

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Lisa Lock

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Andrew Zinin

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