A portable system for closed loop control of the paralysed hand using functional electrical stimulation

Area of Science:

• Neuroprosthetics
• Rehabilitation Engineering
• Biomedical Devices

Background:

• Paralysis, particularly in the hand, significantly impacts daily living and independence.
• Existing assistive technologies for hand paralysis often lack portability or intuitive control.
• Restoring functional grasp is a key goal in neurorehabilitation.

Observation:

• A portable, closed-loop system was developed for hand grasp restoration.
• The system utilizes transcutaneous electrical stimulation controlled by a microprocessor and force sensors in a glove.
• A user interface allows for sequential selection of controller states, including a proportional plus two-stage integral response for grip control.

Findings:

• The system successfully enabled a tetraplegic individual to achieve a stable grip on everyday objects.
• The closed-loop control, incorporating gain adaptation, facilitated consistent grasp force.
• The portable design and user-friendly interface demonstrated practical applicability.

Implications:

• This technology offers a promising avenue for restoring hand function and independence in individuals with paralysis.
• The portable and closed-loop nature of the system suggests potential for widespread clinical and home use.
• Further development could enhance control capabilities and expand applications for upper limb neuroprosthetics.