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The Muscle Cuff Regenerative Peripheral Nerve Interface for the Amplification of Intact Peripheral Nerve Signals
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Selective Nerve Cuff Stimulation Strategies for Prolonging Muscle Output
IEEE Transactions on Bio-Medical Engineering
|August 27, 2019
Summary
Selective nerve stimulation using carousel paradigms significantly prolongs joint moment output by reducing muscle fatigue. This method optimizes stimulation parameters for improved motor neuroprosthesis function.
Area of Science:
- Biomedical Engineering
- Neuroscience
- Rehabilitation Engineering
Background:
- Muscle fatigue limits the effectiveness of neural stimulation systems.
- Selective nerve cuff electrodes offer potential for targeted motor unit pool activation.
- Duty-cycle reduction paradigms can mitigate fatigue and prolong muscle output.
Purpose of the Study:
- Investigate waveform parameters for moment-prolonging stimulation paradigms.
- Determine optimal strategies for implementing these paradigms.
- Enhance joint moment output and reduce muscle fatigue in neuroprosthetic applications.
Main Methods:
- Chronic implantation of composite flat-interface nerve cuff electrodes (C-FINEs) on feline sciatic nerves.
- Cyclic stimulation tests to evaluate effects of stimulation period and duty cycle on motor unit pools (MUPs).
- Comparison of constant, open-loop carousel, and closed-loop carousel stimulation for time to 50% moment reduction (T50), overshoot, and ripple.
Main Results:
- A 1-second stimulation period and low (25%) duty cycles maximized joint moment maintenance.
- Both open- and closed-loop carousel stimulation increased T50 compared to constant stimulation.
- Closed-loop carousel stimulation reduced moment overshoot and ripple more effectively than open-loop.
Conclusions:
- Selectivity-enabled carousel stimulation prolongs joint moment output compared to conventional constant stimulation.
- Waveform parameters can be rapidly optimized for individual MUPs.
- Closed-loop control further enhances the performance of carousel stimulation paradigms.
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