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Electromagnetic Analysis Characterization and Discussion of Inductive Transmission Parameters for Titanium Based Housing Materials in Active Medical Implantable Devices

机译：有源医疗植入设备中钛基外壳材料的电磁分析表征和感应传输参数的讨论

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摘要

The growing demand for active medical implantable devices requires data and or power links between the implant and the outside world. Every implant has to be encapsulated from the body by a specific housing and one of the most common materials used is titanium or titanium alloy. Titanium thas the necessary properties in terms of mechanical and chemical stability and biocompatibility. However, its electrical conductivity presents a challenge for the electromagnetic transmission of data and power. The proposed paper presents a fast and practical method to determine the necessary transmission parameters for titanium encapsulated implants. Therefore, the basic transformer-transmission-model is used with measured or calculated key values for the inductances. Those are then expanded with correction factors to determine the behavior with the encapsulation. The correction factors are extracted from finite element method simulations. These also enable the analysis of the magnetic field distribution inside of the housing. The simulated transmission properties are very close to the measured values. Additionally, based on lumped elements and magnetic field distribution, the influential parameters are discussed in the paper. The parameter discussion describes how to enhance the transmitted power, data-rate or distance, or to reduce the size of the necessary coils. Finally, an example application demonstrates the usage of the methods.
机译：对有源医疗可植入设备的需求不断增长，需要在植入物与外界之间建立数据和/或电源链接。每个植入物都必须通过特定的外壳从体内包裹起来，最常用的材料之一是钛或钛合金。钛在机械和化学稳定性以及生物相容性方面具有必要的性能。然而，其导电性对数据和功率的电磁传输提出了挑战。提出的论文提出了一种快速而实用的方法来确定钛封装的植入物的必要传输参数。因此，将基本的变压器传输模型与测量或计算出的电感关键值一起使用。然后使用校正因子对其进行扩展，以确定封装的性能。校正因子是从有限元方法仿真中提取的。这些还使得能够分析壳体内部的磁场分布。模拟的传输特性非常接近测量值。此外，基于集总元素和磁场分布，对影响参数进行了讨论。参数讨论描述了如何提高发射功率，数据速率或距离，或减小所需线圈的尺寸。最后，一个示例应用程序演示了这些方法的用法。

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