Surface pitting of heart valve disks tested in an accelerated fatigue tester.
Surface pitting of heart valve disks tested in an accelerated fatigue tester.
复制标题
在加速疲劳测试仪中测试的心脏瓣膜表面点蚀。
DOI：
10.1163/15685570052062567
复制
发表时间：
2000
期刊：
影响因子：
--
通讯作者：
T. Yuhta
中科院分区：
文献类型：
--
作者：
H. Lee;T. Shimooka;Y. Mitamura;K. Yamamoto;T. Yuhta
关于植入人体或动物体内的机械心脏瓣膜的断裂有各种报道，并且已经指出断裂是由空化气泡引起的圆盘表面的侵蚀引起的。利用自行设计的加速疲劳试验机对机械心脏瓣膜的空蚀进行了研究。使用了具有不同柔度值的几种阀外壳。使用光学显微镜测量阀盘上凹坑的数量和位置。通过高速摄像机测量了闭孔速度并监测了空化气泡。结果表明，随着阀保持器顺应性的增加，阀瓣关闭速度增加，汽蚀加剧。因此，应仔细注意加速疲劳试验机的顺应性。
There are various reports on the fracture of mechanical heart valves implanted in humans or animals and it has been pointed out that fractures are induced by erosion of the disk surface due to cavitation bubbles. Cavitation erosion on mechanical heart valves was studied using our originally designed accelerated fatigue tester. Several valve housings with different compliance values were used. The number and position of pits on the valve disk were measured using an optical microscope. Disk-closing velocity was measured and cavitation bubbles were monitored by a high-speed video camera. It was found that disk-closing velocity increased and cavitation erosion was enhanced with an increase in compliance of the valve holder. Therefore, careful attention should be paid to the compliance of an accelerated fatigue tester.