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A THIN FILM NITINOL HEART VALVE

机译:薄膜镍钛诺心阀

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摘要

In order to create a less thrombogenic heart valve with improved longevity, a prosthetic heart valve was developed using thin film nitinol (NiTi). A "butterfly" thin film NiTi valve was constructed using a single, elliptical piece of thin film NiTi and a scaffold made from Teflon tubing and NiTi wire. Flow tests and pressure readings across the valve were performed in vitro in a pulsatile flow loop. Biocorrosion experiments were conducted on untreated and passivated thin film nitinol. To determine the material's in vivo biocompatibility, thin film nitinol was implanted in a pig using a stent covered with thin film NiTi. Flow rates and pressure tracings across the valve were comparable to those through a commercially available 19 nun Perimount Edwards tissue valve. No signs of corrosion were present on samples of thin film nitinol after immersion in Hank's solution for 1 month. Finally, organs and tissue samples explanted from the pig 17 days after thin film NiTi implantation appeared without disease, and the thin film nitinol itself was without thrombus formation or endothelialization. Although long term testing will be needed, thin film NiTi may be very well suited for use in artificial heart valves.
机译:为了创建具有更长使用寿命的血栓形成性心脏瓣膜,使用薄膜镍钛合金(NiTi)开发了人工心脏瓣膜。使用单个椭圆形的薄膜NiTi和由特氟龙管和NiTi线制成的支架构造了一个“蝴蝶”薄膜NiTi阀。在体外在脉动流回路中进行阀的流量测试和压力读数。在未经处理和钝化的薄膜镍钛诺上进行了生物腐蚀实验。为了确定材料的体内生物相容性,使用覆盖有薄膜NiTi的支架将薄膜镍钛诺植入猪中。穿过瓣膜的流速和压力曲线与通过市售的19 nun Perimount Edwards组织瓣膜的流速和压力曲线可比。在Hank's溶液中浸泡1个月后,薄膜镍钛合金样品上没有腐蚀迹象。最终,在薄膜镍钛合金植入后17天从猪身上移出的器官和组织样本似乎没有疾病,薄膜镍钛合金本身没有血栓形成或内皮化。尽管需要长期测试,但NiTi薄膜可能非常适合用于人造心脏瓣膜。

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