Z形SG人工血管体外疲劳实验研究

he stent-graft (SG) is the key device to treat AAAs with the effective method of Transluminally Placed Endovascular Grafts. It is used to isolate the aneurysm from the blood flow in case of its rupture. Presently, The stent-graft supported with zigzag shaped stents are widely used in clinical. But it has been reported that some devices presented different fatigue problems during explanations. Thus, it is necessary to investigate the fatigue properties of zigzag shaped stent-grafts in vitro under the simulation condition. This paper is to test and appraise the fatigue property of stent-graft supported with zigzag shaped stents with the in vitro SG fatigue simulation instrument with twist and buckling motion under a dynamic environment. The result showed that two stent-grafts supported with zigzag shaped stents presented the broken grafts and sutures and the scratched stents after 8 and 7 hours respectively. It was speculated that the failure of stent-grafts mainly casused by the sharp tip of zigzag shaped stents and the tightly stitching tension of sutures. Furthermore, TiO2 (2上标，格式无法修改) on the top layer might be destoryed and then the Nickel ions in the inner toxic layer would be exposed if the Nitinol stents were scratched by high-strength sutures. Thus, the structure's design of stents of stent-grafts supported with zigzag shaped stents should be inproved and stengthened.