Department of Electrical and Computer Engineering, University of Houston, Houston, Texas, 77204-4005, USA.
Saluda Medical, Ground Floor, 407 Pacific Highway, Artarmon, New South Wales, 2064, Australia.
Magn Reson Med. 2023 Aug;90(2):686-698. doi: 10.1002/mrm.29650. Epub 2023 Apr 10.
The Radiofrequency (RF)-induced heating for an active implantable medical device (AIMD) with dual parallel leads is evaluated in this paper. The coupling effects between dual parallel leads are studied via simulations and experiments methods. The global transfer function technique is used to assess the RF-induced heating for dual-lead AIMDs inside four human body models.
RF-induced heating for spinal cord stimulator systems with 60 and 90 cm length leads are studied at three parallel dual-lead configurations (closely spaced, 8 mm spaced, and 40 mm spaced) and a single-lead configuration. The global transfer function method is used to develop the AIMD models of different configurations and is used for lead-tip heating assessments inside human body models.
In simulation studies, the peak 1g specific absorption rate/temperatrue rises of dual parallel leads systems is lower than those from the single-lead system. In experimental American Society for Testing and Materials phantom studies, the temperature rises for the single-lead AIMD system can be 2.4 times higher than that from dual-lead AIMD systems. For the spinal cord stimulator systems used in the study, the statistical analysis shows the RF-induced heating of dual-lead configurations are also lower than those from the single-lead configuration inside all four human body models.
For the AIMD system in this study, it shows that the coupling effects between the dual parallel leads of AIMD systems can reduce RF-induced heating. The global transfer function for different spatial distance dual-lead configurations can potentially provide a method for the RF-induced heating evaluation for dual-lead AIMD systems.
本文评估了具有双平行引线的有源植入式医疗器械（AIMD）的射频（RF）感应加热。通过仿真和实验方法研究了双平行引线之间的耦合效应。全球传递函数技术用于评估四种人体模型中双引线 AIMD 的射频感应加热。
研究了长度为 60 和 90cm 的脊髓刺激器系统在三种平行双引线配置（紧密间隔、8mm 间隔和 40mm 间隔）和单引线配置下的 RF 感应加热。全球传递函数方法用于开发不同配置的 AIMD 模型，并用于人体模型内引线尖端加热评估。
在模拟研究中，双平行引线系统的峰值 1g 比吸收率/温度升高低于单引线系统。在实验性美国材料试验协会（ASTM）体模研究中，单引线 AIMD 系统的温升可高于双引线 AIMD 系统的温升 2.4 倍。对于研究中使用的脊髓刺激器系统，统计分析表明，在所有四个人体模型中，双引线配置的 RF 感应加热也低于单引线配置。
对于本研究中的 AIMD 系统，它表明 AIMD 系统的双平行引线之间的耦合效应可以降低 RF 感应加热。不同空间距离双引线配置的全球传递函数可能为双引线 AIMD 系统的 RF 感应加热评估提供一种方法。
