Fluid-Structure Interaction Simulation of Multiple Overlapping Uncovered Stent Intervention in Aortic Dissection
10.16156/j.1004-7220.2021.05.12
- VernacularTitle:多层裸支架植入主动脉夹层的流固耦合数值模拟
- Author:
Lingbo FENG
1
;
Cuiru SUN
1
;
Xiangchen DAI
2
;
Haofei LIU
1
Author Information
1. Department of Mechanics, School of Mechanical Engineering, Tianjin University
2. Department of Vascular Surgery, Tianjin Medical University General Hospital
- Publication Type:Journal Article
- Keywords:
fluid-structure interaction (FSI);
wall stress;
hemodynamics;
aortic dissection;
multiple overlapping uncovered stents (MOUS)
- From:
Journal of Medical Biomechanics
2021;36(5):E738-E746
- CountryChina
- Language:Chinese
-
Abstract:
Objective To propose a one-way fluid-structure interaction (FSI) method based on an idealized aortic dissection model, so as to analyze the hemodynamics and wall stress in the false lumen (FL) under the influence of multiple overlapping uncovered stents (MOUS). Methods Upon establishment of the numerical model, the models were divided into two categories according to whether the model involved FL perfused branch artery. The characteristics of hemodynamics and wall stress state in the post-operative scenarios were simulated under different surgical strategies. The wall stress state of the FL before and after thrombosis formation was also compared and analyzed. ResultsThe release process of the stents had little influence on wall stress of the FL. The high velocity and high wall shear stress (WSS) area in the FL could not be reduced by using the MOUS alone. If only the proximal entry tear was blocked with a covered stent-graft, the distal end would maintain a region of high flow rate and high WSS. The combination of covered stent-graft and MOUS would result in a region of low flow rate and low WSS, as well as reduced wall pressure and wall stress in the FL. Compared with the model with FL perfused branch arteries, the model without it was more likely to form a region of low flow rate and low WSS after surgery. However, blood pressure in the FL was relatively higher. The formation of thrombus in the FL could greatly reduce wall stress in the area covered by the thrombus. Conclusions The method proposed in this study can simultaneously investigate hemodynamics and wall stress characteristics of the FL, and provide support for studying mechanical mechanism of FL thrombolysis induced by MOUS and the post-operative aortic expansion.
