Finite Element Simulation-Based Analysis of Electromagnetic Properties of Biological Tissues on Transmission Performance of Implantable Wireless Charging Systems
DOI:
https://doi.org/10.54097/k0q35e58Keywords:
Wireless Power Transfer, Magnetic Coupling Coefficient, Implantable Medical Devices, Biological Electromagnetic Properties, Finite Element Analysis.Abstract
Wireless charging technology for implantable medical devices has received significant consideration due to its non-contact property. However, its transmission efficiency and safety are deeply influenced by the electromagnetic characteristics of human body tissues. To quantify this effect, this study utilizes ANSYS Maxwell software to build up a simulation model that includes the coil and human body tissue based on finite element analysis and systematically analyzed the working mechanisms of conductivity, permeability, permittivity and the mechanical structure of the coil on determining the magnetic coupling coefficient. The results have shown that, the conductivity of tissues and the misalignment of coil are the main reasons that leads to the decrease of k, while the influence of permittivity in a magnetic coupling dominant mechanism has a negligible impact. Incorporating ANSYS Simplorer to conduct a circuit-level simulation, this study further evaluates the final transmission efficiency and risks for tissue heating of the system, and certified the appropriate range of working frequency (0.1MHz-10MHz) reconciles both high efficiency transmission and biogogical safety. This study provides essential evidence of design and data support for optimizing the transmission coil and selecting the frequency for implantable medical devices of wireless power transfer system.
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