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Novel evaluation method for electrosurgical ablation by monopolar hot biopsy forceps for colonoscopy

Authors Tang C, Choi JH

Received 21 July 2018

Accepted for publication 26 September 2018

Published 24 October 2018 Volume 2018:11 Pages 379—389

DOI https://doi.org/10.2147/MDER.S181025

Checked for plagiarism Yes

Review by Single-blind

Peer reviewers approved by Dr Amy Norman

Peer reviewer comments 2

Editor who approved publication: Dr Scott Fraser


Chen Tang,1 Jung Hun Choi2

1Department of Mechanical Engineering, Ohio University Athens, Athens, OH 45701, USA; 2Department of Mechanical Engineering, Georgia Southern University, Statesboro, GA 30459, USA

Aim: This study evaluates tissue injury, which results from electrosurgical ablation, by correlating lesion depth to tissue impedance, and introduces a newly developed real-time feedback control system that can be applied for preventing excessive tissue injury. Although some previous studies had evaluated such tissue injuries in other ways, a specific mechanism is necessary to actually prevent excessive tissue injury.
Materials and methods: Ablation tests were performed by using an impedance bridge circuit and gel block that have been developed in two previous studies. Depth of the ablation site was measured with the use of a laser displacement measurement device. To simplify the programing work, voltage was used, as a substitution of tissue impedance, to evaluate tissue injury.
Results: The depth of the ablation site was found to increase with either increased power setting or ablation duration, and the depth was analyzed to investigate correlation with measured voltage. The real-time feedback control system was developed by achieving communication between LabVIEW and an Arduino microcontroller.
Conclusion: It is concluded that the depth of the ablation site modestly correlates with the measured voltage under specific conditions, and the newly developed system fulfills the goal of the design.

Keywords: colonoscopy, electrosurgical ablation, impedance, perforation

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