血管医学および外科ジャーナル

概要

Numerical Simulation for Design Evaluation of Thoracic Stent-Grafts to Investigate the Migration Phenomenon and Type 1a Endoleak of Thoracic Aneurysms

M Altnji Hussam Eddin, Benyebka Bou-Said, Helene Walter-Le Berre

The main causes of failure of endovascular aneurysm repair are considered to be migration and endoleak phenomena. Opinions are widely divided on the nature of these serious complications. They occur when the contact between the end of the endograft and the vessel wall is incomplete and ineffective. The main objective of this study is to investigate the effect of Nitinol stent design on the overall effectiveness of contact and radial forces using finite element method. Thoracic aortic aneurysms in certain patients are challenging. The results of the optimized stent show better contact stability to resist migration. It also shows a good compromise of stent design requirements (flexibility and stiffness). In addition, the new design also prevents the risk of stent strut folding and collapse by reducing the energy of eccentric deformation caused by high angles and oversizing.