Electropermanent Magnetic Anchoring for Surgery and Endoscopy

Abstract

This article has been accepted for publication in a future issue of this journal, but has not been fully edited. Content may change prior to final publication. Citation information: DOI 10.1109/TBME.2014.2366032, IEEE Transactions on Biomedical Engineering TBME-00722-2014.R2 1Abstract-The use of magnets for anchoring of instrumentation in minimally invasive surgery and endoscopy has become of increased interest in recent years. Permanent magnets have significant advantages over electromagnets for these applications; larger anchoring and retraction force for comparable size and volume without the need for any external power supply. However, permanent magnets represent a potential hazard in the operating field where inadvertent attraction to surgical instrumentation is often undesirable. The current work proposes an interesting hybrid approach which marries the high forces of permanent magnets with the control of electromagnetic technology including the ability to turn the magnet off when necessary. This is achieved through the use of an electropermanent magnet, which is designed for surgical retraction across the abdominal and gastric walls. Our electropermanent magnet, which is hand-held and does not require continuous power, is designed with a centre lumen which may be used for trocar or needle insertion. The device in this application has been demonstrated successfully in the porcine model where coupling between an intraluminal ring magnet and our electropermanent magnet facilitated guided insertion of an 18Fr Tuohy needle for guidewire placement. Subsequent investigations have demonstrated the ability to control the coupling distance of the system alleviating shortcomings with current methods of magnetic coupling due to variation in transabdominal wall thicknesses. With further refinement, the magnet may find application in the anchoring of endoscopic and surgical instrumentation for minimally invasive interventions in the gastrointestinal tract.

Effect of ureteral stricture in transplant kidney and choice of treatment on long-term graft survival

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“…Research is currently underway to improve and expand the use of magnetism in surgery after the first demonstration of the Magnetic Anchoring and Guidance System (MAGS). 8 Though these systems are path breaking and will guide the future of minimally invasive surgery, they are also, economically, a burden on setups which are not financially well endowed. The financial stress upon the patient may hamper the popularity of the concept of using magnetism in surgery.…”

Principles and thoughts of magnetic surgical instrument structure planning

“…在充磁状态下, 钕铁硼和铝镍钴的 磁通量相加, 呈现为有磁性. (b) 体外电控永磁和体内磁环; (c) 电控永磁磁锚定胃造瘘 Figure 3 Electropermanent magnet [65] . (a) Schematic diagram of the principleofthe electropermanent magnet.…”