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Related Experiment Videos

The NerveSeeker: a system for automated nerve localization.

S A Raymond1, S B Abrams, D B Raemer

  • 1Department of Anesthesia, Brigham and Women's Hospital, Boston, MA 02115.

Regional Anesthesia
|May 1, 1992
PubMed
Summary

The NerveSeeker, a novel nerve stimulator, automatically adjusts current to precisely locate peripheral nerves. This instrument successfully tracked needle movements, indicating readiness for clinical trials.

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Area of Science:

  • Biomedical Engineering
  • Neuroscience
  • Medical Devices

Background:

  • Peripheral nerve blocks are crucial for anesthesia and pain management.
  • Accurate nerve localization is essential to improve block efficacy and minimize complications.
  • Current nerve stimulators require manual adjustment of stimulating current.

Purpose of the Study:

  • To evaluate the performance of the NerveSeeker, a new nerve stimulator with automatic current adjustment.
  • To assess the NerveSeeker's ability to maintain a constant neural response during needle insertion.
  • To determine optimal parameters for the NerveSeeker's feedback control system.

Main Methods:

  • Utilized an excised frog nerve in a transparent chamber for direct observation.
  • Employed a feedback control system to automatically adjust stimulating current amplitude.

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  • Correlated control voltage with stimulus magnitude to indicate needle proximity to the nerve.
  • Analyzed device performance in tracking needle movements at various velocities.

    • Main Results:

    • A combined strategy of reducing stimulus on approach and incrementing on withdrawal proved effective.
    • The NerveSeeker maintained a constant neural response, guiding needle placement.
    • Nerve localization was successful, with the device tracking needle movements up to 2 mm/second.
    • Optimal control parameters were identified, balancing engineering and physiological factors.

    Conclusions:

    • Experimental results demonstrate the NerveSeeker's efficacy in peripheral nerve localization.
    • The device's automatic current adjustment offers improved guidance during nerve blocks.
    • Clinical testing of the NerveSeeker is warranted based on successful experimental validation.