Modelling on mutual inductance of wireless power transfer for capsule endoscopy
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Modelling on mutual inductance of wireless power transfer for capsule endoscopy Shuai Kuang 1
&
Guozheng Yan 1
# Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract Wireless capsule endoscopy (WCE) is noninvasive, painless, and riskless on detection for gastrointestinal disease. It attracts increasing attention. Wireless power transfer (WPT) technology is utilized to supply power for WCE. Receiving coil (RC) of WPT is capsulated into WCE. Its position and direction change all through gastrointestinal tract. Transmitting coil (TC) is worn by the patient. So the mutual inductance varies all the time. It should be studied to ensure sufficient receiving power. However, existing analytical methods do not reach satisfactory accuracy. They can only solve simple cases with positional misalignment. Numerical simulation models are time-consuming. Furthermore, an entirely new simulation must be repeated when any change in alignment occurs. Thus, based on geometry and misalignment of RC and TC, a model for mutual inductance is proposed. Compared with analytical methods, it is applicable to not only circular and rectangular RC, but also the elliptic, with directional misalignment. It costs below 0.1% of computational time of the simulation for the same accuracy. Moreover, any change in misalignment is easily handled by a simple change of parameter in the model. It reaches a tradeoff between computational accuracy and time. Receiving power is evaluated rapidly and accurately with proposed model. Keywords Wireless capsule endoscopy . Gastrointestinal disease . Micro biomedical implants . Mutual coupling . Wireless power transmission
1 Introduction Wireless capsule endoscope (WCE) for gastrointestinal (GI) diseases detection is noninvasive, painless, and riskless, compared with conventional endoscopy. It increasingly attracts researchers’ interest, after the appearance of the first WCE product named M2A in 2000 (Iddan et al. 2000). Various WCEs are invented. For example, active capsule robot uses clampers to anchor or expand the tract under instructions to avoid missing area of interest during detection (Son et al. 2019; Zhou et al. 2016). Narrow Band Imaging, Auto Fluorescence Imaging, and Ultrasound Imaging are adopted
* Shuai Kuang [email protected] Guozheng Yan [email protected] 1
Department of Precise Medical Engineering and Intelligent Electronic Microsystems, School of Electronics Information and Electrical Engineering, Shanghai Jiao Tong University, Shanghai, China
in WCE to increase the accuracy of medical diagnosis (YEN et al. 2018; Demosthenous et al. 2016; Charfi et al. 2019). Advanced functions, such as biopsy and drug release are also proposed (Xie et al. 2015; Ivanoff et al. 2016). Power demand rises acutely. If battery is still employed for powering WCE as before, its volume should be magnified several times to realize referred functions (Baldwin et al. 2017). The WCE would not be swallowable anymore. Fortunately, wireless power transfer (WPT) technology based on electromagnetic c
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