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Soft ‘n smart: wearable tech for upper-limb rehab

In prototype form at the moment, the tech from researchers at the Harvard John A. Paulson School of Engineering and Applied Sciences and the Wyss Institute may possibly transform upper-limb rehabilitation potential for stroke survivors by offering several key advantages over their rigid counterparts.

Instead of a bulky, mechanical frame, the new device, named ‘Reachable’, is a comfortable, sensor-loaded vest with an inflatable bladder under the arm. This design is less restrictive, more portable, and can be worn for longer durations, which is critical for intensive, repetitive therapy needed for motor recovery.

The Reachable device utilises a combination of a physics-based model and a machine learning algorithm to tailor assistance to each individual’s unique movement patterns. The system tracks movement and pressure with sensors and uses this data to learn the user’s intent. By doing so, the robot provides assistance that feels more natural and intuitive.

In testing, the device demonstrated the ability to distinguish a user’s intended shoulder movements with high accuracy. It effectively reduced the amount of force needed to lower an arm by about a third and users showed larger, more efficient ranges of motion in their shoulders, elbows, and wrists, reducing the need for compensatory movements like body leaning.

A major strength of the Harvard research is its strong emphasis on user feedback. Patients with stroke and ALS were involved in testing and development from the early stages, ensuring that the final device is not only clinically effective but also comfortable and easy to use. This patient-centered approach was highlighted by one volunteer who noted feeling engaged in the process rather than feeling like a ‘lab rat’. This feedback loop was instrumental in refining the design for better aesthetics and wearability, which are vital for real-world adoption.

The development of this lightweight, wearable technology holds significant promise for home-based rehabilitation. Many stroke survivors face challenges accessing consistent in-clinic therapy due to cost and travel. A portable device like Reachable could allow patients to perform therapeutic exercises more frequently and regain independence in their daily lives, from eating and drinking to other routine tasks. Researchers have secured grants to further test the device with users in their homes, a crucial step toward commercialisation.


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