The Spinal Needle Test Effectively Measures Abdominal Wall Thickness before Cannula Placement at Laparoscopy

Milad, Magdy P.; Terkildsen, Mary Faith

doi:10.1016/s1074-3804(05)60529-4

Cited by 22 publications

(15 citation statements)

References 8 publications

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“…These instruments may be useful in most human patients according to the data from the Milad and Terkildsen study [15]. Certainly, our strength measurements are encouraging and support the continued develop of the MAGS platform.…”

Section: Discussionmentioning

confidence: 58%

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Maximizing coupling strength of magnetically anchored surgical instruments: how thick can we go?

et al. 2010

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Section: Discussionmentioning

confidence: 58%

“…However, Milad and Terkildsen carefully conducted a study in 138 consecutive women (body mass index (BMI) 17.2-60 kg/m 2 ) who underwent gynecologic laparoscopic operations [15]. After This is the first study to critically evaluate the potential abdominal wall thickness for which magnetically anchored instruments are suitable.…”

Section: Discussionmentioning

confidence: 99%

Maximizing coupling strength of magnetically anchored surgical instruments: how thick can we go?

et al. 2010

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“…Due to the relatively large size of the colon [33]- [35] and the close correlation between abdominal wall thickness and BMI [36], future iterations of the device should seek to magnetize the EPM to a value such that coupling only occurs at a known minimum displacement between the internal magnet and EPM. This may alleviate the risk of pinching the colon in between the stomach and abdomen wall, thus reducing the possibility of adverse events during PEG tube placements.…”

Section: Discussionmentioning

confidence: 99%

Electropermanent Magnetic Anchoring for Surgery and Endoscopy

Tugwell

Brennan

O’Shea

et al. 2015

IEEE Trans. Biomed. Eng.

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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.

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“…It was also observed that the human abdomen, which is initially cylindrical in shape, becomes a domed shape after intra-abdominal insufflation pressure reaches 12mmHg, with an average abdominal cavity volume to be 1.27 × 10 −3 m 3 . 3) Abdominal wall thickness Statistical studies showed that the average abdominal wall thickness among average build patients is approximately 2cm while among obese patients, the average thickness is around 8cm [104]. External PMs of the appropriate sizes are required to cater for different wall thickness.…”

Section: B Clinical Considerationsmentioning

confidence: 99%