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有源植入式医疗设备的金属外壳在磁耦合能量传输应用中,由于涡流效应而限制了磁耦合能量传输的效率,且带来装置发热问题。针对该问题,该文建立含金属介质的磁耦合能量传输的等效电路模型,提出以接收效率为优化目标的系统设计方法,并用于可充电脑起搏器的研制。根据等效电路模型,接收效率取决于接收线圈匝数、负载阻抗和阻抗匹配参数;较高的等效负载阻抗会带来接收线圈最佳匝数增加,同时导致传输功率、传输效率和接收效率增加;电容串联补偿时,最佳补偿电容在较大值时获得,电容并联补偿时,最佳补偿电容在较小值时获得。动物试验结果表明,所研制的可充电脑起搏器在无温度控制下,最高温度多数分布在36~38℃,满足临床使用要求。
In the case of magnetic coupling energy transfer applications, the metal casing of an active implantable medical device limits the efficiency of magnetic coupling energy transmission due to the eddy current effect and brings about device heating problems. In order to solve this problem, an equivalent circuit model of magnetic coupling energy transfer of metal-containing medium is established and a system design method is proposed to optimize the receiving efficiency. According to the equivalent circuit model, the receiving efficiency depends on the number of turns of the receiving coil, the load impedance, and the impedance matching parameter. Higher equivalent load impedance results in an increase in the optimal number of turns of the receiving coil, resulting in transmission power, transmission efficiency, and reception efficiency Increase; Capacitor series compensation, the best compensation capacitor obtained at larger values, the capacitor compensation in parallel, the best compensation capacitor obtained at smaller values. The results of animal experiments show that the maximum temperature of most of the maximum temperature distribution of the developed PCP is in the range of 36 ~ 38 ℃ without temperature control, which meets the clinical requirements.