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Open AccessArticle

Passive Magnetic-Flux-Concentrator Based Electromagnetic Targeting System for Endobronchoscopy

1
Department of Mechanical Engineering, National Chiao Tung University, Hsinchu 30010, Taiwan
2
Department of Internal Medicine, National Taiwan University Hospital, Taipei 10002, Taiwan
3
Department of Internal Medicine, National Taiwan University Hospital Hsin-Chu Branch, Hsinchu 30059, Taiwan
4
Department of Medicine, National Taiwan University Cancer Center, Taipei 10672, Taiwan
5
International College of Semiconductor Technology, National Chiao Tung University, Hsinchu 30010, Taiwan
*
Author to whom correspondence should be addressed.
Co-First Author (Equal Contribution).
Sensors 2019, 19(23), 5105; https://doi.org/10.3390/s19235105
Received: 12 July 2019 / Revised: 7 November 2019 / Accepted: 15 November 2019 / Published: 21 November 2019
(This article belongs to the Section Physical Sensors)
In this paper, we demonstrate an innovative electromagnetic targeting system utilizing a passive magnetic-flux-concentrator for tracking endobronchoscope used in the diagnosis process of lung cancer tumors/lesions. The system consists of a magnetic-flux emitting coil, a magnetic-flux receiving electromagnets-array, and high permeability silicon-steel sheets rolled as a collar (as the passive magnetic-flux-concentrator) fixed in a guide sheath of an endobronchoscope. The emitting coil is used to produce AC magnetic-flux, which is consequently received by the receiving electromagnets-array. Due to the electromagnetic-induction, a voltage is induced in the receiving electromagnets-array. When the endobronchoscope’s guide sheath (with the silicon-steel collar) travels between the emitting coil and the receiving electromagnets-arrays, the magnetic flux is concentrated by the silicon-steel collar and thereby the induced voltage is changed. Through analyzing the voltage–pattern change, the location of the silicon–steel collar with the guide sheath is targeted. For testing, a bronchial-tree model for training medical doctors and operators is used to test our system. According to experimental results, the system is successfully verified to be able to target the endobronchoscope in the bronchial-tree model. The targeting errors on the x-, y- and z-axes are 9 mm, 10 mm, and 5 mm, respectively. View Full-Text
Keywords: passive magnetic-flux concentrator; magnetic; electromagnetic; targeting; tracking; locating; endobronchoscope; endoscope; lung cancer tumor/lesion passive magnetic-flux concentrator; magnetic; electromagnetic; targeting; tracking; locating; endobronchoscope; endoscope; lung cancer tumor/lesion
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Chen, C.-C.; Lin, C.-K.; Chang, C.-W.; Cheng, Y.-C.; Chen, J.-E.; Tsai, S.-L.; Chung, T.-K. Passive Magnetic-Flux-Concentrator Based Electromagnetic Targeting System for Endobronchoscopy. Sensors 2019, 19, 5105.

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