Optimal Design of Coils for Wireless Energy Transfer Urethral Valve

This study optimizes a wireless energy transmission coil to address the low efficiency in percutaneous energy transmission of existing urethral valves. Based on the response surface method and genetic algorithm, the optimal model of wireless energy transmission efficiency is established, and the optimal structure parameters of the coil are determined. The influence of adding ferrite substrate and optimizing the structure on the link transmission efficiency (LTE) for the initial coil, as well as the impact of transmitting coil location on the LTE, was studied theoretically and experimentally. The experimental analysis focuses on the optimized coil’s LTE and the urethral valve’s driving performance. Additionally, a simulation is conducted to assess the electromagnetic safety of the optimized coil. The results show that the structural optimization approach suggested in this research is around 13% more efficient than merely adding substrate, and combining the two enhances the LTE. The LTE decreases as the transmitting coil deflection angle increases. Adding substrate and optimizing the structure can minimize the impact of transmitting coil position change on the LTE. At an axial distance of 30 mm, the optimized coil exhibits an LTE of 74.4%. Compared with the hollow solenoid coil, the urethral valve indicates a 24.4% increase in LTE, a 9.1% increase in driving force, and a reduction of 9.2 s in urethral opening time. After optimization, the coil’s radiation dose to the abdomen’s subcutaneous tissue is less than the fundamental limit, meeting the safe use requirements. This study can provide theoretical guidance for optimizing the design of efficient, portable, and reliable urethral valves.