Background

The implanted non-vascular stent is prone to fatigue fracture due to the periodic cyclic load caused by long-term physiological motion in the non-vascular lumen.

Objective

To effectively study and predict the fatigue performance of non-vascular stents, an experimental setup was designed to simulate and conduct fatigue performance tests on non-vascular stents under various loads. This design simplified the periodic cyclic loads generated within non-vascular lumens, in accordance with the physiological motion patterns of non-vascular lumens, into pulsatile loads.

Methods

To meet the requirements of different stents and various fluctuating load conditions during testing, the relationship between test conditions and the fatigue load of the stent was studied based on Fluent.

Results

A fatigue test device with a special load module was built and used to complete the fatigue performance test of a group of esophageal stents. It can be found that the experimental device can satisfy the control and application of the fatigue load of the stent, and can effectively realize the testing requirements of the fatigue performance of the stent.

Conclusion

In this paper, a non-vascular stent fatigue in vitro test device that can simulate the fluctuating load of a non-vascular lumen is designed. The results of flow field simulation, fatigue simulation, and actual fatigue test show that the device can meet the needs of fatigue test and has good versatility and operability.

中文翻译：

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非血管支架液压加载疲劳试验装置的设计与应用研究

背景

植入的非血管支架由于非血管腔内长期生理运动产生的周期性循环载荷，容易发生疲劳断裂。

客观的

为了有效研究和预测非血管支架的疲劳性能，设计了实验装置，对非血管支架在不同载荷下进行疲劳性能模拟和测试。该设计根据非血管腔的生理运动模式，将非血管腔内产生的周期性循环负载简化为脉动负载。

方法

为了满足测试时不同支架和各种脉动载荷工况的要求，基于Fluent研究了试验工况与支架疲劳载荷的关系。

结果

搭建了带有特殊负载模块的疲劳测试装置，并用于完成一组食管支架的疲劳性能测试。可以发现，该实验装置能够满足支架疲劳载荷的控制和应用，能够有效实现支架疲劳性能的测试要求。

结论

本文设计了一种可模拟非血管管腔波动载荷的非血管支架疲劳体外测试装置。流场模拟、疲劳模拟和实际疲劳试验结果表明，该装置能够满足疲劳试验的需要，具有良好的通用性和可操作性。