IEEE Trans Biomed Circuits Syst. 2010 Apr;4(2):77-85. doi: 10.1109/TBCAS.2009.2034364.
Small implantable medical devices, such as wireless capsule endoscopes, that can be swallowed have previously been developed. However, these devices cannot continuously operate for more than 8 h because of battery limitations; moreover, additional functionalities cannot be introduced. This paper proposes a design method for a high-efficiency energy transmission transformer (ETT) that can transmit energy transcutaneously to small implantable medical devices using electromagnetic induction. First, the authors propose an unconventional design method to develop such a high-efficiency ETT. This method can be readily used to calculate the exact transmission efficiency for changes in the material and design parameters (i.e., the magnetic material, transmission frequency, load resistance, etc.). Next, the ac-to-ac energy transmission efficiency is calculated and compared with experimental measurements. Then, suitable conditions for practical transmission are identified. A maximum efficiency of 33.1% can be obtained at a transmission frequency of 500 kHz and a receiving power of 100 mW for a receiving coil size of ¿5 mm × 20 mm. Future design optimization is possible by using this method.
先前已经开发出了一些能够被吞咽的小型植入式医疗设备，例如无线胶囊内窥镜。但是，由于电池的限制，这些设备无法持续运行超过 8 小时；此外，也无法引入额外的功能。本文提出了一种高效能能量传输变压器（ETT）的设计方法，该变压器可利用电磁感应经皮肤向小型植入式医疗设备传输能量。首先，作者提出了一种非常规的设计方法，用于开发这种高效能的 ETT。这种方法可以方便地计算材料和设计参数（即磁性材料、传输频率、负载电阻等）变化时的精确传输效率。接下来，计算并比较交流到交流的能量传输效率与实验测量结果。然后，确定实际传输的合适条件。对于接收线圈尺寸为 ¿5 mm × 20 mm、接收功率为 100 mW 的情况，在传输频率为 500 kHz 时可获得 33.1%的最大效率。通过使用这种方法，可以进行未来的设计优化。
