This paper addresses the challenge of wireless power transfer to implantable endovascular devices, which have been used for pressure monitoring and tissue stimulation. However, a thorough analysis and optimization of the wireless link remain unexplored, leaving the maximum power efficiency and power delivery unknown. Methods: Theoretical analysis, computer simulations, and experimental measurements with biological tissues were combined. Results: Different coils were designed and optimized for endovascular devices and compared. With proper geometry, material, and frequency selection for coils, power efficiency over 10% and power delivery over 100 mW was achieved at 15 mm under human safety limits. Conclusion: This work demonstrates an optimized results and provides some key insights for endovascular coil design. Significance: The designed inductive link enables a minimally invasive, durable, and powerefficient solution for future endovascular applications.