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Muscle recruitment with intrafascicular electrodes.
IEEE Transactions on Bio-Medical Engineering
|August 1, 1991
Summary
Bipolar intrafascicular electrodes effectively stimulate muscles for functional neuromuscular stimulation. Optimal biphasic pulses require low current, indicating safety and potential for further development in nerve stimulation technology.
Area of Science:
- Biomedical Engineering
- Neuroscience
- Rehabilitation Technology
Background:
- Intrafascicular electrodes are typically designed for recording neural activity.
- Peripheral nerve stimulation is crucial for functional neuromuscular stimulation (FNS).
Purpose of the Study:
- To evaluate the efficacy of Teflon-insulated, platinum-iridium (Pt-Ir) intrafascicular electrodes as stimulating devices.
- To determine the optimal stimulus parameters for muscle recruitment using these electrodes.
Main Methods:
- Implantation of 25-micron diameter Pt-Ir electrodes into nerves innervating cat gastrocnemius and soleus muscles.
- Characterization of muscle recruitment using varying biphasic rectangular pulse configurations.
- Assessment of spinal reflex contribution by interrupting the nerve pathway.
Main Results:
- Optimal stimulation achieved with a biphasic rectangular pulse (500 µs interphase, 50 µs duration) at approximately 50 µA for half-maximal twitch.
- Stimulation current and charge densities were below established safety limits for tissue and electrode materials.
- Spinal reflex contribution to muscle force varied between implants, indicating inconsistent reflex pathway involvement.
Conclusions:
- Intrafascicular electrodes demonstrate significant potential as stimulating devices for functional neuromuscular stimulation.
- Further research and development are warranted to optimize intrafascicular electrode technology for FNS applications.
- The study highlights the dual capability of intrafascicular electrodes for both recording and stimulation in peripheral nerve applications.