Miniaturized 3-D Cross-Type Receiver for Wirelessly Powered Capsule Endoscopy
Miniaturized 3-D Cross-Type Receiver for Wirelessly Powered Capsule Endoscopy
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DOI：
10.1109/tmtt.2019.2893204
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发表时间：
2019-05-01
影响因子：
4.3
通讯作者：
Desmulliez, Marc P. Y.
中科院分区：
文献类型：
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作者：
Khan, Sadeque Reza;Pavuluri, Sumanth Kumar;Desmulliez, Marc P. Y.
本文介绍了用于将无线功率传输（WPT）到内窥镜胶囊中的十字型接收器（RX）的建模、实现和测试。提出了用于接收器的3-D配置以增加无线链路功率传输效率（WL-PTE）并增强其对胶囊的角度变化的鲁棒性。柔性发射线圈的直径和厚度分别为200 mm和185 μ m。小型化RX的直径为8 mm，适合集成在当前市售胶囊内。实验结果表明，WL-PTE为1.3%和完整的系统效率为0.9%内的一个合适的组织模型的相对介电常数为300在5 MHz。还测量到在RX的90度方向上WL-PTE的最大变化仅为8.4%。最小WL-PTE 1%是体模内7 cm平移位移的记录器。计算出的模拟比吸收率为0.86 W/Kg，远低于医疗应用允许的限值。在10 h的操作持续时间内还测量到2.2 ℃的最大温度变化，这是胃肠道内胶囊行程的典型情况。所提出的系统代表了胶囊式内窥镜中WPT的可行性建议。
This paper presents the modeling, implementation, and testing of a cross-type receiver (RX) used for wireless power transfer (WPT) into an endoscopic capsule. A 3-D configuration for the receiver is proposed to increase the wireless link power transfer efficiency (WL-PTE) and enhance its robustness to angular variations of the capsule. The diameter and thickness of the flexible transmitter coils are 200 mm and 185 mu m, respectively. The diameter of the miniaturized RX is 8 mm, which is appropriate for integration within current commercially available capsules. Experimental results demonstrate a WL-PTE of 1.3% and complete system efficiency of 0.9% inside a suitable tissue phantom of the relative permittivity of 300 at 5 MHz. A maximum variation of only 8.4% of the WL-PTE across 90 degrees orientation of the RX was also measured. The minimum WL-PTE of 1% is the recorder for 7-cm translational displacement inside the phantom. A simulated specific absorption rate of 0.86 W/Kg was calculated, which is well below the limit allowed for medical applications. A maximum temperature variation of 2.2 degrees C was also measured for an operating duration of 10 h, which is typical of a capsule journey inside the gastrointestinal tract. The proposed system represents a viable proposition for WPT in capsule endoscopy.