The authors present a novel magnetomechanical elastic element that can be loaded remotely by varying the magnetic field surrounding it and that is able to store and release mechanical energy upon external triggering. The magnetic torsion spring (MTS) is used as the core component of a self-contained miniature biopsy capsule (9 mm in diameter and 24 mm long) for random tissue sampling in the small bowel. Thanks to the MTS concept, the biopsy mechanism can be loaded wirelessly by a magnetic field applied from outside the body of the patient. At the same time, magnetic coupling guarantees stabilization against the small bowel tissue during sampling. Extreme miniaturization is possible with the proposed approach since no electronics and no power supply are required onboard.
Magnetic Torsion Spring Mechanism for a Wireless Biopsy Capsule
Polo Sant'Anna Valdera,
Manuscript received October 2, 2012; final manuscript received July 16, 2013; published online September 24, 2013. Assoc. Editor: William K. Durfee.
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Simi, M., Gerboni, G., Menciassi, A., and Valdastri, P. (September 24, 2013). "Magnetic Torsion Spring Mechanism for a Wireless Biopsy Capsule." ASME. J. Med. Devices. December 2013; 7(4): 041009. https://doi.org/10.1115/1.4025185
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