Analysis Of The Deformation Behavior And Hemodynamics For Vena Cava Filter

Vena cava filter can intercept deep venous thrombosis to avoid pulmonary embolism and play an important role in the prevention of pulmonary embolism.In the use of vena cava filter for prevention and treatment of pulmonary embolism problem,various mechanical properties and filtration properties effect of vena cava filter is difficult in clinical monitoring and prediction,the filter performance is low may cause various complications,and even lead to life-threatening pulmonary embolism.In order to predict the filtering effects of different vena cava filters under different thrombus diameters and thrombus volume fractions,5 different structures of the vena cava filter models were constructed.The mechanical properties and hemodynamic simulation were simulated by finite element method and computational fluid dynamics method respectively.The deformation behavior,support performance and blood of different thrombus parameters were compared and analyzed.Flow mechanical properties,fluid solid coupling performance and filtration thrombus performance.In this study,Solidworks software is used for 3D solid modeling.The grid is divided and processed through Hypermesh.Abaqus software is used to conduct deformation behavior and support performance analysis.Fluent and Ansys Workbench software are applied to the analysis of hemodynamics and fluid solid coupling respectively.The results of the study are as follows:1)The maximum elastic strain of the five filters is less than the critical value,indicating that there is no crack or fracture failure,and the support performance analysis shows that the support performance of the TE filter is the best.2)Filter structure,thrombus diameter and thrombus volume fraction have significant effects on hemodynamics,fluid solid coupling performance and filtration thrombus performance.Relatively speaking,the filtration effect of TE filter is the best,followed by AN filter,and then the GT filter.The difference between AN filter and GT filter is not obvious.3)The hemodynamic performance and fluid solid coupling performance of filter are affected by the diameter of thrombus,the volume fraction of thrombus and the structure of filter.The filter rod near the center position of the AN filter is better to capture thrombus,and the effect of the GF filter is better than that of the S shaped curve of the filter.The effect of the thrombus is better at the corner of the eight petal shaped filter rods of the GT filter and the intersection of the four long rods.The results show that it is critical to determine the structure of the filter based on the diameter of thrombus and the volume fraction of thrombus.The simulation results have laid a theoretical foundation for the structure design,structure optimization and clinical selection of the vena cava filter.