This paper presents a new urethral valve to deal with severe urinary incontinence (UI) caused by sphincter injury or dysneuria. This valve consists of a wireless power transfer system and a valve body structure driven by SMA (shape memory alloy) spring. The mechanical model of SMA spring and coupling model of wireless energy transfer are derived. Special attention is also given to the biological effects of electromagnetic filed as the proposed device is powered by wireless power transfer system. This valve is validated by simulation experiment and the models are used to investigate the influence of SMA spring parameters, control parameters and coil parameters on the driving characteristics of the proposed urethral valve.

中文翻译：

---

用于治疗严重尿失禁的尿道瓣膜的建模和性能分析

本文提出了一种新的尿道瓣膜来治疗由括约肌损伤或神经痛引起的严重尿失禁 (UI)。该阀由无线电力传输系统和由SMA（形状记忆合金）弹簧驱动的阀体结构组成。推导了SMA弹簧的力学模型和无线能量传输的耦合模型。由于所提出的设备由无线电力传输系统供电，因此还特别注意电磁场的生物效应。通过仿真实验对该阀门进行了验证，并利用模型研究了SMA弹簧参数、控制参数和线圈参数对所提出的尿道阀门驱动特性的影响。