A personalized sensor-controlled microstimulator system for arm rehabilitation poststroke. Part 1: System...

Area of Science:

• Neuroscience
• Biomedical Engineering
• Rehabilitation Medicine

Background:

• Stroke frequently causes upper limb motor dysfunction, necessitating effective rehabilitation strategies.
• Current rehabilitation methods may lack personalization and patient engagement.
• Functional electrical stimulation (FES) offers potential for restoring motor function.

Purpose of the Study:

• To develop and test a novel sensor-controlled functional electrical stimulation (FES) system for post-stroke upper limb rehabilitation.
• To enable sequential activation of upper limb muscles for improved functional recovery.
• To allow patients to control the rehabilitation process at their own pace.

Main Methods:

• A personalized, external sensor-based system was designed to control microstimulators implanted near radial nerve branches.
• The system facilitates sequential stimulation for elbow, wrist, and finger extension, along with thumb abduction.
• System architecture, sensor design, and equipment testing were conducted.

Main Results:

• The system successfully passed all electrical, magnetic, and safety tests according to International Electrotechnical Commission 60601-1 standards.
• A minor vulnerability to drops was identified in one sensor type.
• The system demonstrated the ability to activate muscles sequentially for upper limb movement.

Conclusions:

• The developed sensor-controlled FES system is safe and meets technical requirements for post-stroke rehabilitation.
• Patient-paced activation enhances the acceptability and efficiency of the rehabilitation process.
• This system shows promise for supporting functional recovery in the post-stroke upper limb.