Investigation on the Design and Application of Hydraulic Loading Fatigue Test Device for Non-Vascular Stent

BackgroundThe 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.ObjectiveTo 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.MethodsTo 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.ResultsA 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.ConclusionIn 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.