Development of artificial urethra valve using shape memory alloy for the incontinence prevention

本研究对尿道进行一般性收紧，在尿道空腔处开启，目的是研制一种能在睡眠状态下可变削减收紧压力的阀门，以防止尿道坏死。该阀为内嵌式，阀门的操作采用记忆合金和硅树脂。本研究的研究项目及开展结果如下：(1)通过形状记忆特性测试，综合考虑体内使用、恢复温度和形状记忆合金，考察其作为致动器的可能性。(2)模拟了拉伸试验机的应力-应变曲线，以实现对形状记忆运动的控制，并考察了其作为执行器的可能性。(3)根据形状记忆合金的特性和仿真结果，研制了两种人工尿道阀。一种是u型人工尿道阀，另一种是椭圆型人工尿道阀。(4)采用u型仿真尿道模型进行椭圆实验，确认人工尿道阀的运动及阀的泄漏情况。(5)由于睡眠状态下的收缩压力较低。通过两个椭圆阀的组合实现了拧紧压力的变化。虽然人工尿道阀在动物实验中对狗的假设已经完成，但由于在动物实验评价中还没有涉及到，还需要进一步的研究。通过本研究，不仅可以预防尿失禁，而且可以控制尿失禁的数量，并为可能出现尿失禁的严重程度的患者开发了形状记忆合金硅树脂人工尿道阀。

This study tightens urethra generally, it opens in the voidance urethra, and it is a purpose to develop the valve which low variably cuts the tightening pressure under sleeping for the necrosis prevention of the urethra. This valve was the internal embedded, and shaoe memory alloy and silicon resin were used in the operation of the valve. Research items and results of carrying out in this study are follows.(1) By the characteristics test of shape memorry ally considering using in vivo, recovery temperature and shape memory alloy, and the possibility as an actuator was examined.(2) Stress-strain curve of the tensiletest was simulated in order to control the movement of shape memorry ally, and the possibility as an actuator was examined.(3) From characteristics result and simulation result of the shape memory alloy, two artificial urethra valves were developed. One is artificial urethra valve of the U-type, and the elliptic in another.(4) Elliptic experiment for movement confirmation of the artificial urethra valve and leakage condition of the valve using the simulation urethra model with the U-type.(5) As a resuly of low variably cutting the tighening pressure under sleeping. the variety of the tightening pressure was realized by combining two elliptic valves.Though the artificial urethra valve fir the animal experiment ont he assumption of the dog has been completed, further resuarch is necessary, because it has not come to it in the animal experiment evaluation. By this study, not only that it prevents the incontinence but also that it controls the quantity of the voidance became possible, and the possibility of the incontinence patient of the severity was developed shape memory alloy silicon resin artificial urethra valve.