Venous valve stent design
Low, Jun Yu
Date of Issue2019-06-28
School of Mechanical and Aerospace Engineering
Chronic venous insufficiency (CVI) is a condition whereby the venous valves fail to function as intended and this results in retrograde blood flow. This affects the efficiency of blood flowing from the lower extremities of the human limbs back to the heart. Hence, there is a need to design a stent that can accommodate the suturing of artificial venous valve to replace the native venous valves, particularly in the great saphenous vein. In this report, the steps in designing the venous valve stent were presented as well as the findings from which issues were identified from performing finite element analysis on the various stent designs on a crimping process in Abaqus 2017. One main criteria to determine the feasibility of the stent design is the maximum tensile strain variable threshold of 10% for Nitinol material. If the strain value from the Finite Element Analysis software, Abaqus, exceed 10%, it will lead to the failure of the stent. Results in these simulations concluded that the final design presented in this report met the design requirements of this project. An average of 9.24% strain value out of the seven simulations of varying mesh sizes were concluded. With the lowest strain value of 7.98% of 0.32 global mesh size, and highest strain value of 11.25% of 0.06 global mesh size.
Final Year Project (FYP)
Nanyang Technological University