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Electropermanent magnetic anchoring for surgery and endoscopy.

Josef Tugwell, Philip Brennan, Conor O'Shea

    IEEE Transactions on Bio-Medical Engineering
    |November 1, 2014
    PubMed
    Summary

    Researchers developed a novel electropermanent magnet for minimally invasive surgery. This hybrid magnet combines strong permanent magnet forces with electromagnetic control, enabling safe and precise instrument anchoring and guidance.

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    Area of Science:

    • Biomedical Engineering
    • Surgical Technology
    • Medical Devices

    Background:

    • Permanent magnets offer advantages for surgical anchoring but pose risks due to uncontrolled attraction.
    • Electromagnets provide control but often lack the necessary force for surgical applications.
    • A need exists for magnetic devices that combine strong anchoring forces with controlled deactivation.

    Purpose of the Study:

    • To develop and evaluate a novel electropermanent magnet for surgical retraction and instrument guidance.
    • To integrate the benefits of permanent magnets (high force) with electromagnetic control (on/off capability).
    • To address limitations in current magnetic coupling methods for minimally invasive procedures.

    Main Methods:

    • Design of a hand-held, self-powered electropermanent magnet with a central lumen for instrumentation.
    • Demonstration in a porcine model using an intraluminal ring magnet and the electropermanent magnet for guided needle insertion.
    • Investigation of controlled magnetic coupling distance across varying tissue thicknesses.

    Main Results:

    • Successful guided insertion of an 18 Fr Tuohy needle for guidewire placement in a porcine model.
    • Demonstrated ability to control the magnetic coupling distance, compensating for transabdominal wall thickness variations.
    • The electropermanent magnet functioned effectively without continuous power supply.

    Conclusions:

    • The developed electropermanent magnet offers a safe and controllable solution for magnetic anchoring in surgery.
    • This technology shows promise for improving instrument guidance and placement in minimally invasive gastrointestinal interventions.
    • Further refinement could lead to widespread application in anchoring endoscopic and surgical tools.