In this letter, we analyze a capacitive coupler for wireless power transfer (WPT) to intravascular implant devices using a stent that contacts the vessel wall for vasodilation as a power receiver. We focus on the effect of conductivity on the transfer efficiency of capacitive WPT and verify the relationship between the maximum transfer efficiency and conductivity based on an equivalent circuit, including arteries and body tissues. We also measure the permittivity and conductivity of biological tissues and explain the appropriate measurement method for each biological tissue. Then, we design the electrode size of the capacitive coupler, and the experimental results of CWPT are presented. We can transfer power into blood vessels through a subcutaneous fatty skin with an efficiency of 35% at 434 MHz, which is the ISM band.

中文翻译：

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用于向血管内植入设备进行无线功率传输的电容耦合器


在这封信中，我们分析了一种电容耦合器，用于向血管内植入设备进行无线功率传输 (WPT)，使用接触血管壁以实现血管舒张的支架作为功率接收器。我们重点研究电导率对电容式WPT传输效率的影响，并基于包括动脉和身体组织的等效电路验证最大传输效率和电导率之间的关系。我们还测量生物组织的介电常数和电导率，并解释每种生物组织的适当测量方法。然后，我们设计了电容耦合器的电极尺寸，并给出了CWPT的实验结果。我们可以通过皮下脂肪皮肤将能量传输到血管，在 434 MHz（ISM 频段）下效率为 35%。