Design of non-equal-strut stent hoops for structural optimization of thoracic aortic stent-grafts. Issue 1 (3rd January 2022)

• Record Type: Journal Article
• Authors: Yan, Shiju; Song, Chengli; Si, Yi; Zhao, Yiwen
• Is Part Of: Minimally invasive therapy & allied technologies. Volume 31:Issue 1(2022)
• Page Start: 58
• Page End: 71
• Publication Date: 2022-01-03
• Subjects: Endovascular aortic aneurysm repair (EVAR) -- stent-grafts -- structural design -- radial force -- longitudinal flexibility; Endoscopy -- Periodicals; Interventional radiology -- Periodicals; Endoscopic surgery -- Periodicals; 617.05
• DOI: 10.1080/13645706.2020.1745849
• Languages: English
• ISSNs: 1364-5706

Abstract

Abstract: Background: Endovascular aortic aneurysm repair (EVAR) with stent-grafts is used widely for the treatment of thoracic aortic aneurysms (TAA). Inappropriate design of stent-grafts may lead to complications such as endoleak, stent-graft migration and new entries, causes of which may be inappropriate radial support force or insufficient longitudinal flexibility of the stent-grafts. Material and methods: To improve the mechanical performance of the stent-grafts, a type of non-equal-strut stent hoops was proposed, and the influence of structural parameters on the mechanical performance was studied. Results: Results of numerical simulation and physical experiments show that by using the proposed non-equal-strut stent hoops, radial support force and longitudinal flexibility of stent-grafts can be reconciled and balanced. Conclusion: Results of this study could be used to facilitate radial force control and longitudinal flexibility enhancement in the design of aortic stent-grafts.