女性压力性尿失禁吊带的设计及其体外力学性能评价

Design and in-vitro mechanical property analyses of sling for female stress urinary incontinence

为改善女性压力性尿失禁吊带术后侵蚀并发症,制备了菱形网孔激光切割边缘吊带和矩形网孔自锁成边吊带,分别测试了吊带网片宽度、厚度、面密度、线圈密度、密度对比系数、孔径尺寸、孔隙率和有效孔隙率,并且进行了单轴向拉伸测试与定负荷反复拉伸测试,初步分析了2款吊带的长期有效性与抗皱缩变形能力。结果表明:2款吊带均满足轻质大孔、高有效孔隙率的需求,断裂强度与断裂伸长率均无显著差异;矩形网眼吊带的弹性模量与抗弯刚度明显大于菱形网眼吊带,在2.5和16 N/cm定负荷拉伸下都具有更高的有效孔隙率和更优异的尺寸稳定性,同时具有更显著的尿道壁支撑作用,但吊带的柔软度仍需进一步改进。

To improve the postoperative erosion of female stress urinary incontinence,a sling with laser-cut diamond-shaped pores and a sling with rectangular pore shapes and self-locking edge were designed.The mesh width,thickness,density,ratio of course density to wale density,pore size,porosity,and effective porosity were characterized and analyzed.The test results of the uniaxial tension and constant load tension test,and the long-term effectiveness and the shrinkage of the two types of slings were discussed and studied.The results show that the two slings are light-weight with large pores,meeting the requirements of high effective porosity,and there is no significant difference between the two in breaking strength and elongation.However,the elastic modulus and flexural stiffness of rectangular mesh sling are obviously larger than that of diamond mesh sling,having higher effective porosity,better dimensional stability and more significant supporting effect of urethral wall under both 2.5 and 16 N/cm loading.The flexibility of the slings would need further improvement.