Innovative textile structures designed to prevent type III endoleaks in endovascular stent‐grafts
Autor: | Graeham Douglas, Jing Lin, Mark Nutley, Chaojing Li, Yvan Douville, Robert Guidoin, Du Jia, Lu Wang, Ze Zhang |
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Rok vydání: | 2020 |
Předmět: |
Materials science
Textile Endoleak medicine.medical_treatment 0206 medical engineering Biomedical Engineering Medicine (miscellaneous) Bioengineering 02 engineering and technology 030204 cardiovascular system & hematology Prosthesis Design Abrasion (geology) Biomaterials Blood Vessel Prosthesis Implantation 03 medical and health sciences 0302 clinical medicine Materials Testing Ultimate tensile strength medicine Pleat Composite material Weaving business.industry Textiles Endovascular Procedures technology industry and agriculture Stent General Medicine 020601 biomedical engineering Blood Vessel Prosthesis surgical procedures operative Stents business |
Zdroj: | Artificial Organs. 45:278-288 |
ISSN: | 1525-1594 0160-564X |
Popis: | The damage caused to the fabric of endovascular stent-grafts most often occurs at the contact zones between the fabrics where they are attached to the apices of Z-shaped stents as a result of normal physiologic pulsatile movement within angulated vessels in vivo. Although design improvements were made over the years, the risks were not fully eliminated even with the newer M-shaped stent reconfiguration. In this study, we proposed to create and manufacture a novel fabric for stent-grafts with specifically designed reinforced zones to enhance resistance to fabric abrasion. These reinforced zones are set at the vicinity of the apices of the Z-shaped stents and between two adjacent Z-shaped stents where folding and pleating are commonly observed to occur in angulated vessels. Three innovative weaving structures with two different types of yarns and two controls were designed and prepared. Two commonly used commercial devices supported, respectively, with ringed stents, and Z-shaped stents were selected as the references for comparison. Textile structures including thickness, water permeability, mechanical properties, (more specifically tensile and bursting stress, as well as fatigue simulation) were tested on all fabrics. Compared to commercially available plain weaves, the fabrics with locally reinforced zones showed improved mechanical characteristics and fatigue resistant properties. A fabric designed with specifically reinforced zones has now clearly been shown to effectively reduce the abrasion caused by the apices of Z-shaped stents. However, further optimization may still be possible. |
Databáze: | OpenAIRE |
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