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This is Figure 1 from the paper cited below.
The buckling characteristics of the stent by cross sectional analysis after deployment in the aneurysm model is shown in figure 1. Stents with straight pattern buckle during deployment if cell size is <~10 mm, and with helical pattern buckle during deployment if cell size <~8 mm.
FROM:
Mark C. Arokiaraj and Igor F. Palacios, “Finite element modeling of a novel self-expanding endovascular stent method in treatment of aortic aneurysms”, Scientific Reports 4, Article number: 3630, 2014
DOI: 10.1038/srep03630
ABSTRACT: A novel large self-expanding endovascular stent was designed with strut thickness of 70 μm × 70 μm width. The method was developed and investigated to identify a novel simpler technique in aortic aneurysm therapy. Stage 1 analysis was performed after deploying it in a virtual aneurysm model of 6 cm wide × 6 cm long fusiform hyper-elastic anisotropic design. At cell width of 9 mm, there was no buckling or migration of the stent at 180 Hg. Radial force of the stents was estimated after parametric variations. In stage 2 analysis, a prototype 300 μm × 150 μm stent with a cell width of 9 mm was chosen, and it was evaluated similarly after embedding in the aortic wall, and also with a tissue overgrowth of 1 mm over the stent. The 300/150 μm stent reduced the peak wall stress by 70% in the aneurysm and 50% reduction in compliance after embedding. Stage 3 analysis was performed to study the efficacy of stents with struts (thickness/width) 70/70, 180/100 and 300/150 μm after embedding and tissue overgrowth. The adjacent wall stresses were very minimal in stents with 180/100 and 70/70 μm struts after embedding. There is potential for a novel stent method in aortic aneurysm therapy.
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