Wireless Power Supply Based on MNG-MNZ Metamaterial for Cardiac Pacemakers

CES Transactions on Electrical Machines and Systems Pub Date : 2024-03-01 DOI:10.30941/CESTEMS.2024.00011

Weihua Chen;Jingtao Jia;Xiaoheng Yan;Yuhang Song;Jiayi Li

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Abstract

To solve the low power transfer efficiency and magnetic field leakage problems of cardiac pacemaker wireless powering, we proposed a wireless power supply system suitable for implanted cardiac pacemaker based on mu-negative (MNG) and mu-near-zero (MNZ) metamaterials. First, a hybrid metamaterial consisted of central MNG unit for magnetic field concentration and surrounding MNZ units for magnetic leakage shielding was established by theoretical calculation. Afterwards, the magnetic field distribution of wireless power supply system with MNG-MNZ metamaterial slab was acquired via finite element simulation and verified to be better than the distribution with conventional MNG slab deployed. Finally, an experimental platform of wireless power supply system was established with which power transfer experiment and system temperature rise experiment were conducted. Simulation and experimental results showed that the power transfer efficiency was improved from 44.44%, 19.42%, 8.63% and 6.19% to 55.77%, 62.39%, 20.81% and 14.52% at 9.6 mm, 20 mm, 30 mm and 50 mm, respectively. The maximum SAR acquired by SAR simulation under human body environment was -7.14 dbm and maximum reduction of the magnetic field strength around the receiving coil was 2.82 A/m. The maximum temperature rise during 30min charging test was 3.85°C, and the safety requirements of human bodies were met.

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基于 MNG-MNZ 超材料的心脏起搏器无线供电系统

为了解决心脏起搏器无线供电的低功率传输效率和磁场泄漏问题，我们提出了一种基于μ负（MNG）和μ近零（MNZ）超材料的适用于植入式心脏起搏器的无线供电系统。首先，我们通过理论计算建立了一种混合超材料，它由用于集中磁场的中心 MNG 单元和用于屏蔽漏磁的周围 MNZ 单元组成。随后，通过有限元仿真获得了使用 MNG-MNZ 超材料板的无线供电系统的磁场分布，并验证了其优于传统 MNG 板的磁场分布。最后，建立了无线供电系统的实验平台，进行了功率传输实验和系统温升实验。仿真和实验结果表明，在 9.6 毫米、20 毫米、30 毫米和 50 毫米处，功率传输效率分别从 44.44%、19.42%、8.63% 和 6.19% 提高到 55.77%、62.39%、20.81% 和 14.52%。在人体环境下，通过 SAR 模拟获得的最大 SAR 为 -7.14 dbm，接收线圈周围磁场强度的最大减幅为 2.82 A/m。30 分钟充电测试期间的最大温升为 3.85°C，符合人体安全要求。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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CES Transactions on Electrical Machines and Systems

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