Research on Urethral Valve Driven by SMA Based on Magnetic Induction Heating Power Supply
In order to address the issues of complex energy supply systems and low biocompatibility and reliability in the existing SMA-driven urethral valves,this paper proposes a novel approach that utilizes the thermal effect of magnetic fluid in an alternating magnetic field to directly provide thermal energy to the SMA spring,and designs a urethral valve driven by SMA based on magnetic induction heating power supply.The paper establishes mathematical models for the electro-magnetic conversion,magnetic-thermal conversion and thermal-mechanical conversion of the urethral valve.The influence of the magnetic field control parameters on the driving characteristics of the urethral valve is studied through simulations and experiments,and the material parameters of the magnetic fluid are optimized.The experimental studies on the opening and closing characteristics of the urethral valve are conducted.The research results indicate that the principle of the urethral valve is feasible,and the structure of the implanted part is simple.Increasing the magnetic field intensity or alternating frequency both enhance the driving characteristics,and the heating power of the magnetic fluid increases by 57％after parameter optimization.The urethral valve exhibits good opening and closing characteristics with an average urine flow rate of 13.6 ml/s.The established mathematical models are effective and practical,providing theoretical guidance for the structural design and characterization analysis of the urethral valve.
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