Key result
In vitro mechanical simulation demonstrated that applying restrictive bare stents to aortic covered stents improves chronic outward force at initial compression but can be harmful at higher compression.
Why the study?
The study was conducted to discuss the mechanical properties of stents and optimize the selection scheme of the overlapping segment through in vitro mechanical simulation.
Does the application of restrictive bare stents alter the radial force and mechanical properties of overlapping segments in thoracic endovascular aortic repair?
Does the application of restrictive bare stents alter the radial force and mechanical properties of overlapping segments in thoracic endovascular aortic repair?
In vitro mechanical simulation demonstrates that restrictive bare stents can optimize the radial force of overlapping stent segments in TEVAR, though they may increase outward force excessively at high compression levels.
May optimize TEVAR overlap forces in models; leaves open clinical use pending human validation.
AIMS AND OBJECTIVES: To discuss the mechanical properties of stents and optimize the stents' selection scheme of overlapping segment through in vitro mechanical simulation of stent grafts. MATERIALS AND METHODS: The radial force tester was used to measure the radial force of different aortic covered stents, bare stents and the combination of the two. Linear relationship between the radial force at the distal end of the stent and oversize rate was plotted. The stent-induced aortic wall shear stress was evaluated intuitively by mechanical simulation. RESULTS: The radial force curve of the distal end of the thoracic aortic covered stent reflected the superelastic characteristics of aortic stent, and the characteristics was more obvious in stents composed of nickel-titanium than stainless; When different size of Hercules stents were combined with the same sized restrictive bare stent, the oversize rate of overlapping segment was the same, and the radial force was similar; At the initial compression diameter, the use of restrictive bare stent can improve the chronic outward force, but at high compression level, the chronic outward force of the overlapping segment was higher than that of the individual aortic covered stent. CONCLUSIONS: Based on in vitro mechanical simulation, the stent-vessel wall interaction after implantation can be more intuitively understood. The application of restrictive bare stents can change the radial force of the overlapping segment of the stents by reducing the oversize rate of the distal end of the stent-graft, but it can be harmful at a higher compression level.
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Shen et al. (2023) studied Thoracic endovascular aortic repair. Restrictive bare stents combined with aortic covered stents vs. Individual aortic covered stents was evaluated on Radial force and stent-induced aortic wall shear stress. In vitro mechanical simulation demonstrated that applying restrictive bare stents to aortic covered stents improves chronic outward force at initial compression but can be harmful at higher compression.
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