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An active approach for charge balancing in functional electrical stimulation.

Kriangkrai Sooksood, Thomas Stieglitz, Maurits Ortmanns

    IEEE Transactions on Biomedical Circuits and Systems
    |July 16, 2013
    PubMed
    Summary
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    This study introduces a novel active charge balancing method using long-term offset regulation for functional electrical stimulation. This technique prevents electrode damage and tissue destruction by actively managing charge accumulation during stimulation.

    Area of Science:

    • Biomedical Engineering
    • Neuroscience
    • Materials Science

    Background:

    • Charge accumulation during functional electrical stimulation (FES) can cause electrode degradation and tissue damage.
    • Existing charge balancing methods, both active and passive, have limitations in long-term efficacy.
    • Ensuring charge neutrality is critical for the safety and longevity of FES devices.

    Purpose of the Study:

    • To present and evaluate a new active charge balancing technique utilizing long-term offset regulation for FES.
    • To compare the efficacy of this novel method against a previously developed active balancer and traditional passive techniques.
    • To validate the performance of different charge balancing strategies through experimental testing.

    Main Methods:

    • A novel active charge balancing approach based on long-term offset regulation was developed.

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  • Electrode voltage was monitored post-stimulation cycle to ensure it remained within a safe voltage range.
  • An offset current was adjusted to counteract biphasic current mismatches in subsequent stimulations.
  • The new method was experimentally compared with a prior active charge balancer and passive techniques.
  • Experiments were conducted using a platinum black electrode immersed in 0.9% saline solution.

    • Main Results:

    • The proposed long-term offset regulation effectively balanced charge during FES.
    • Experimental results demonstrated the technique's ability to maintain electrode voltage within the predefined range.
    • The novel active method showed comparable or superior performance to existing active and passive balancing techniques.
    • No significant electrode dissolution or tissue damage indicators were observed with the new method during experimental trials.

    Conclusions:

    • The developed active charge balancing technique using long-term offset regulation offers a promising solution for safe and effective FES.
    • This method addresses critical safety concerns related to charge accumulation, electrode longevity, and tissue integrity.
    • Further research and development could lead to improved FES system safety and performance.