Analysis of Current Density and Specific Absorption Rate in Biological Tissue Surrounding Transcutaneous Transformer for an Artificial Heart
Analysis of Current Density and Specific Absorption Rate in Biological Tissue Surrounding Transcutaneous Transformer for an Artificial Heart
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DOI：
10.1109/tbme.2007.900550
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发表时间：
2008
影响因子：
4.6
通讯作者：
K. Shiba;Masayuki Nukaya;T. Tsuji;K. Koshiji
中科院分区：
文献类型：
--
作者：
K. Shiba;Masayuki Nukaya;T. Tsuji;K. Koshiji
本文报道了人工心脏空心经皮Transformer周围生物组织的电流密度和比吸收率（SAR）分析。通过传输线建模方法分析了生物组织中的电磁场，计算了电流密度和SAR随频率、输出电压、输出功率和线圈尺寸的变化关系。模型的生物组织有三层，包括皮肤、脂肪和肌肉。模拟分析的结果表明，SAR是非常小的，在任何给定的传输条件下，约2-14 mW/kg，与国际非电离辐射防护委员会（ICNIRP; 2 W/kg）的基本限制相比，而电流密度除以ICNIRP的基本限制随着频率的上升和输出电压福尔斯下降而变小。当频率超过250 kHz并且输出电压低于24 V时，可以在低于ICNIRP的基本限制的情况下传输能量。此外，使电流密度最大化的生物组织的部分因频率而异;低频是肌肉，高频是皮肤。边界在频率600-1000 kHz附近。
This paper reports on the current density and specific absorption rate (SAR) analysis of biological tissue surrounding an air-core transcutaneous transformer for an artificial heart. The electromagnetic field in the biological tissue is analyzed by the transmission line modeling method, and the current density and SAR as a function of frequency, output voltage, output power, and coil dimension are calculated. The biological tissue of the model has three layers including the skin, fat, and muscle. The results of simulation analysis show SARs to be very small at any given transmission conditions, about 2-14 mW/kg, compared to the basic restrictions of the International Commission on nonionizing radiation protection (ICNIRP; 2 W/kg), while the current density divided by the ICNIRP's basic restrictions gets smaller as the frequency rises and the output voltage falls. It is possible to transfer energy below the ICNIRP's basic restrictions when the frequency is over 250 kHz and the output voltage is under 24 V. Also, the parts of the biological tissue that maximized the current density differ by frequencies; in the low frequency is muscle and in the high frequency is skin. The boundary is in the vicinity of the frequency 600-1000 kHz.