感应供电脑植入视觉假体的安全SAR水平

A. Al-Kalbani, M. Yuce, Jean-Michel Redouté
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引用次数: 9

摘要

本文利用基于CAD的头部模型推导了感应动力脑植入视觉假体的健康风险。设计了一种工作频率为5mhz的高效自振荡E级发射电路,为植入物提供无线供电。利用有限积分法计算了头部模型内部的电磁场。仿真结果表明,当功率传输为1w时,平均大于10g的最大局部SAR水平达到1.91 W/kg,略低于2w /kg的安全水平。使用同一功率变送器,考虑和不考虑生物热因素(如血流量和基础代谢率)时,脑内温度分别比施加体温37℃高0.918℃和0.293℃。
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Safe SAR levels in inductively powered brain implanted visual prostheses
This paper derives the health risks of an inductively powered brain implanted visual prosthesis with a CAD based head model. A high efficiency self-oscillating class E transmitter circuit operating at 5 MHz has been designed to wirelessly power the implant. The electromagnetic field inside the head model has been computed using Finite Integration Technique method. Simulations illustrate that a maximum localized SAR level averaged over 10 g attains 1.91 W/kg when the power transmission is equal to 1 W, which is just below the safe level specified at 2 W/kg. Using the same power transmitter, the temperature in the brain with and without considering bio-heat factors, such as blood flow and basal metabolic rate, increases respectively with 0.918 °C and 0.293 °C above the applied body temperature of 37 °C.
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