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This lecture delves into the world of implantable devices, focusing on the challenges and innovations in wireless power and data transfer for devices like pacemakers, cochlear implants, and retinal implants. The instructor discusses the importance of optimizing the design of inductive links, considering factors such as coil geometry, resonance frequency, and load variation to maximize power transfer efficiency. Through examples and simulations, the lecture highlights the impact of tissue environment on coil performance and the significance of reflected load on overall efficiency. The audience gains insights into the complexities of designing efficient wireless systems for implantable devices, balancing factors like coil size, geometry, and tissue interaction.