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Functional electrical stimulation in tetraplegic patients to restore hand function.
Gregory G Degnan1, Tyler C Wind, Elizabeth V Jones
1Department of Orthopedic Surgery, University of Virginia Health Systems, Charlottesville, VA 22908-0376, USA. gd4c@virginia.edu
Journal of Long-Term Effects of Medical Implants
|January 28, 2003
Summary
This review details a novel neuroprosthesis for spinal cord injury patients, restoring hand function through functional electrical stimulation. This innovative device enables lateral pinch and palmar grasp, significantly improving upper extremity capabilities.
Area of Science:
- Biomedical Engineering
- Neurorehabilitation
- Reconstructive Surgery
Background:
- Spinal cord injuries, particularly at the C5 and C6 motor levels, often result in significant loss of upper extremity function, impacting daily living activities.
- Restoration of hand function is a critical goal in improving the quality of life for individuals with tetraplegia.
Purpose of the Study:
- To describe a new neuroprosthesis system designed to restore lateral pinch and palmar grasp.
- To present a novel approach to functional electrical stimulation (FES) for individuals with specific spinal cord injuries.
Main Methods:
- The neuroprosthesis integrates implanted components (receiver-stimulator, electrodes) with external components (transmitting coil).
- Electrical stimulation is delivered to muscles via surgically implanted epimysial or intramuscular electrodes.
- Contralateral shoulder movements activate the external coil, wirelessly triggering the implanted stimulator.
Main Results:
- The system successfully induces muscle contractions to restore hand grasp functions.
- Surgical modifications to hand biomechanics effectively overcome limitations posed by lower motor neuron damage in key muscles.
Conclusions:
- This neuroprosthesis represents a significant advancement in functional electrical stimulation for individuals with C5-C6 spinal cord injuries.
- The technology offers a viable pathway for regaining essential hand functions, thereby enhancing independence and quality of life.