Optimization Design for Receiving Coil with Novel Structure Based on Mutual Coupling Model in Wireless Power Transmission for Capsule Endoscope

Abstract

Wireless capsule endoscope (WCE) is a promising technology for noninvasive and painless imaging detection on gastrointestinal (GI) diseases. On the other hand, conventional endoscopes with wires could discomfort patients and cause them to vomit and aerosolize coronavirus if the patients are infected with COVID-19. However, there stands a technical bottleneck on power supply for the WCE. With the help of wireless power transmission technology, a hollow receiving coil (RC) is proposed to supply sufficient power and also minimize the size of WCE. A model on mutual inductance between transmitting and receiving coils is proposed to evaluate receiving power when the RC is in a different position and direction of patient’s GI tract. Based on the model, an optimal RC is built to obtain sufficient and stable power. Measurement of mutual inductance with the optimal RC validates high accuracy of the proposed model. The standard deviation of receiving power is very low. WCE with optimum RC gets sufficient power and captures images stably in live pig’s intestine tract. Additionally, the model is little affected by biological tissues. It ensures reliable performance of WCE and makes popular clinical application of WCE possible, which is also a relief to reduce epidemics like COVID-19.

Near‐field wireless power transfer used in biomedical implants: A comprehensive review

“…For BMIs, WPT provides a safe, efficient, and comfortable charging approach that overcomes the complication of power capacity and decreases the cost and complications associated with surgical battery replacement. Several BMSs and BMIs are highly dependent on WPT, including left ventricular assist FIGURE 1 Classification of wireless power transfer technology devices (LVADs) [10], capsule endoscopes [11], heart rate sensors [12], deep brain stimulators (DBSs) [13], and many other biomedical applications. A century ago, Nicola Tesla performed experiments to transfer power wirelessly.…”

“…FIGURE11 (a) Proposed intraocular implantable sensor for glaucoma treatment suggested in[107,108], (b) The prototype of the experimental setup with beef tissue in[108], c) coils suggested in[108] …”

Optimization of Transfer Quality Factor of Limited-Size Coils for Series-Series Compensated Inductive Power Transfer System

“…The "null zones" can be better solved through the optimization of the coil array, so as to improve the energy transmission efficiency under the worst working condition by forty percent. In [24], an optimal hollow coil is proposed to supply stable power and minimize the size of wireless capsule endoscope. The most obvious disadvantage of WPT compared with wired power supply is its energy leakage, and the electromagnetic coils are the key part affecting the magnetic flux leakage.…”