Intention-driven functional electrical stimulation therapy using a wearable high-density electrode sleeve in chronic...

Area of Science:

• Neuroscience
• Rehabilitation Medicine
• Biomedical Engineering

Background:

• Functional Electrical Stimulation (FES) is a long-standing method for motor retraining post-stroke.
• Optimizing FES rehabilitation involves combining it with task-oriented therapy (FES therapy or FEST), synchronizing stimulation with volitional intent, and training multiple tasks.
• A novel wearable FES technology was employed to test these enhanced FEST principles in two chronic stroke survivors.

Purpose of the Study:

• To evaluate the efficacy of a novel wearable FES system for delivering intention-driven, multi-task FES therapy (FEST) in chronic stroke survivors.
• To demonstrate the feasibility of using the NeuroLife Sleeve for enhanced FEST.
• To provide preliminary evidence for motor recovery supported by this advanced FEST approach.

Main Methods:

• Development of the NeuroLife Sleeve, a wearable forearm device with a high-density FES electrode grid controllable via operator input or electromyographic (EMG) signals.
• Implementation of an eight-week FEST program featuring intention-driven FES for multiple movements, delivered twice weekly via operator control and once weekly via EMG control.
• Utilizing the sleeve's capability for rapid, software-based switching of stimulation configurations without electrode repositioning.

Main Results:

• Both subjects demonstrated significant improvements in upper extremity motor function tests, including the Box and Blocks Test, Action Research Arm Test, Fugl Meyer Upper Extremity score, and 9-Hole Peg Test.
• Clinical gains were sustained during a 10-week follow-up period with over 80% reduction in FES exposure.
• The NeuroLife Sleeve facilitated seamless transitions between different functional tasks and stimulation parameters.

Conclusions:

• The NeuroLife Sleeve offers a novel wearable interface for delivering enhanced FEST, supporting both operator-triggered and EMG-controlled FES.
• Preliminary evidence suggests that intention-driven FEST, delivered via the NeuroLife Sleeve, can support motor recovery in chronic stroke survivors.
• Further research is needed to distinguish the specific therapeutic contributions of operator-controlled versus EMG-controlled FES paradigms.