Optimizing Inductive Link Design for Wireless Power Transfer to Implanted Medical Devices in Preclinical Studies with COMSOL

Traditional medicine has advanced significantly in the recent years, but some pathologies remain difficult to treat. Implantable medical devices (IMDs) offer a promising solution, providing continuous monitoring, early detection, and targeted treatment for dysfunctional organs, complementing traditional therapies. Preclinical studies are essential to validate IMD safety, effectiveness, and interactions with traditional approaches. However, powering IMDs is a major challenge. This study presents a Wireless Power Transfer (WPT) technique based on inductive coupling to power a chip implanted in a freely moving rat within a cage. We evaluate various coil geometries to optimize WPT efficiency and minimize heating. Using MATLAB and COMSOL software, we analyze two-and multi-coil configurations to ensure continuous power delivery while meeting safety standards for SAR and temperature. Our results show that geometric optimization enhances WPT, reduces energy waste, and minimizes radiation exposure.