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Chronic sensory-motor activity in behaving animals using regenerative multi-electrode interfaces.

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    The Regenerative Multi-electrode Interface (REMI) provides stable, high-quality chronic recordings from peripheral nerves for up to 120 days. This technology shows promise for enhancing control and sensory feedback in robotic prosthetics.

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    Area of Science:

    • Biomedical Engineering
    • Neuroscience
    • Regenerative Medicine

    Background:

    • Peripheral nerve interfaces are crucial for advanced prosthetic limb control.
    • Regenerative interfaces offer potential for naturalistic prosthetic function.
    • The Regenerative Multi-electrode Interface (REMI) guides axonal regeneration through an electrode array.

    Purpose of the Study:

    • To evaluate the chronic performance and signal quality of the REMI.
    • To assess REMI's efficacy in interfacing with different nerve fascicles.
    • To explore REMI's potential for improving closed-loop prosthetic control systems.

    Main Methods:

    • Implantation of REMI in the rat sciatic nerve for chronic recording up to 120 days.
    • Testing REMI with tibial (motor) and sural (sensory) nerve fascicles.
    • Utilizing a modified REMI in an insertion mode for small fascicle interfacing.

    Main Results:

    • REMI demonstrated stable, high-quality recordings for 120 days, with failures linked to abiotic factors.
    • Successful recordings from the tibial nerve showed activity synchronous with stepping.
    • Implantation into the small sural nerve fascicle was challenging, but a modified REMI successfully recorded sensory signals.

    Conclusions:

    • The REMI is a stable and effective tool for chronic peripheral nerve signal recording.
    • REMI can differentiate activity in motor and sensory fascicles, aiding targeted prosthetic control.
    • This technology holds significant potential for enhancing motor control and sensory feedback in robotic prostheses.