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A Single-Stage Single-Coil Wireless Multi-Channel Adiabatic Supply Stimulation System for Multiple Source Current

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    Summary
    This summary is machine-generated.

    This study introduces a wireless multi-channel adiabatic supply stimulation (M-CASS) system for efficient deep brain stimulation. The M-CASS system enables independent control of four stimulus currents using a single coil, enhancing energy efficiency.

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    Area of Science:

    • Biomedical Engineering
    • Electrical Engineering
    • Neuroscience

    Background:

    • Deep brain stimulation (DBS) requires precise current control for therapeutic efficacy.
    • Existing wireless power solutions for multi-channel stimulation often face challenges with efficiency and complexity.
    • Independent current regulation across multiple channels is crucial for advanced neuromodulation therapies.

    Purpose of the Study:

    • To present a novel single-stage, single-coil wireless multi-channel adiabatic supply stimulation (M-CASS) system.
    • To demonstrate independent regulation of four constant stimulus currents without power-hungry current sources.
    • To enhance AC-to-stimulation efficiency in wireless adiabatic stimulation for deep brain stimulation applications.

    Main Methods:

    • Development of a wireless power distributor combined with an AC-DC quadruple-output current regulator.
    • Implementation of a channel-optimized size control technique and a wide adaptive offset control scheme.
    • Fabrication of the M-CASS system using a 2.72 mm² 0.25-μm CMOS process operating over a 6.78-MHz resonant link.

    Main Results:

    • The M-CASS system successfully generated four independently controlled adiabatic supplies and stimulus currents.
    • A peak AC-to-stimulation efficiency of 82.2% was achieved when delivering four 2-mA currents.
    • High efficiency (approx. 80%) was maintained even with varying impedances and currents across the four channels.

    Conclusions:

    • The M-CASS system offers a compact and energy-efficient solution for multiple-source current-steering (MSCS) deep brain stimulation.
    • Independent control of multiple stimulus channels via a single wireless link is feasible and efficient.
    • This technology advances the development of sophisticated and less invasive neuromodulation devices.