Numerical models of net-structure stents inserted into arteries

Area of Science:

• Biomedical Engineering
• Computational Mechanics
• Cardiovascular Research

Background:

• Stent-artery interactions post-angioplasty induce stresses, a primary cause of restenosis.
• Numerical simulations are crucial for analyzing these mechanical interactions.
• Computational demands necessitate simplified modeling approaches.

Purpose of the Study:

• To introduce and validate simplified models for calculating mechanical interactions between net-structured stents and arteries.
• To assess the cost-effectiveness and accuracy of these simplified models.
• To analyze the influence of various factors on arterial stresses.

Main Methods:

• Development of 2D simplified numerical models for cost-effective assessment of arterial stresses and damage factor.
• Solving contact problems for hyperelastic arteries.
• Analysis of stresses across various cases, model types, and parameters like oversizing, stenosis, and symmetry.

Main Results:

• Planar 2D models demonstrated good agreement with complex 3D models for axisymmetric stenosis cases.
• A high correlation was observed between 3D and simplified 2D models for varying stenosis.
• Maximal stresses in 2D models with asymmetric stenosis were lower than in axisymmetric cases.

Conclusions:

• Simplified 2D models serve as a convenient tool for calculating arterial wall stresses in complex scenarios.
• Axisymmetric models may provide a conservative, worst-case estimation of stresses for stent evaluation.
• The findings support the use of simplified models for efficient analysis of stent-artery biomechanics.