无线胶囊内窥镜新型接收线圈结构设计与分析方法

目前无线胶囊内窥镜(WCE)供应能量过低,限制了其诊查胃肠道病灶的性能。基于此提出了镂空三维接收线圈,线圈里可放置无线胶囊其他模块,进一步缩小无线胶囊体积。根据电磁场理论提出单匝分析法,分析了此线圈感应电动势和接收功率,并提出均匀度性能指标建立最优化模型,得出线圈最优设计参数;搭建角度姿态旋转平台测量线圈的感应电动势,实验测得感应电动势与理论值误差小于6%,验证了单匝分析法和线圈设计的合理性;将此线圈供能的无线胶囊内窥镜植入活体猪小肠内,得到的图像传输速率稳定为30 f/s,分辨率为400×400。新型线圈可给胶囊内窥镜提供充足稳定的能量,用于胃肠道疾病诊查。单匝分析法的应用不仅限于此结构的线圈,也可用于他它发射、接收装置相对位置和角度变化的植入式医疗设备的功率分析,并且此方法可用于求解发射和接收两级线圈之间的互感等电磁参数。

Design of novel structure and analysis method for receiving coil of wireless capsule endoscopy

Currently, the power supply of wireless capsule endoscopy (WCE) is poor, which limits the detection performance for gastrointestinal disease focus. A hollow 3D receiving coil is proposed, in which other modules of the WCE could be placed and the volume of the WCE is reduced further. A single turn analysis method is proposed according to the electromagnetic field theory. The induced electromotive force (EMF) and receiving power of the coil are analyzed. The uniformity performance index is proposed and the optimization model is established. The optimal design parameters of the coil is obtained. An angle attitude rotation platform was built to measure the EMF of the coil. The tested error between the measured EMF and its theoretical value is less than 6%, which verifies the rationality of the single turn analysis method and the coil design. The WCE power supplied with the designed coil was implanted into the intestine of a pig in vivo. The obtained image transmission rate is stably at 30 f/s with resolution of 400*400. The novel coil can provide sufficient and stable power, which is used for the WCE to implement gastrointestinal disease detection. The single turn analysis method can not only be applied to the designed coil, but also be applied to the power analysis of other implantable medical devices with altering relative position and angle between transmitter and receiver. The proposed method can also be used to solve the electromagnetic parameters, such as mutual inductance between transmitting and receiving coils.