Measurement of Frictional Properties of Aortic Stent Grafts and Their Delivery Systems
| Autor: | Matthew G. Doyle, Cristina H. Amon, Tianhao Chen, Thomas L. Forbes, Dawn S. Y. Lin, Michael Lancaster |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
medicine.medical_specialty
Aorta Materials science integumentary system medicine.medical_treatment Biomedical Engineering Medicine (miscellaneous) 02 engineering and technology 030204 cardiovascular system & hematology Aortic stent Endovascular aneurysm repair Surgery 03 medical and health sciences surgical procedures operative 020303 mechanical engineering & transports 0302 clinical medicine 0203 mechanical engineering medicine.artery medicine cardiovascular diseases Coefficient of friction |
| Zdroj: | Journal of Medical Devices. 13 |
| ISSN: | 1932-619X 1932-6181 |
| DOI: | 10.1115/1.4043292 |
| Popis: | Stent grafts are medical devices used to treat abdominal aortic aneurysms (AAAs) in endovascular aneurysm repair (EVAR). Computational and experimental models have been developed to study stent graft delivery and deployment during EVAR; however, frictional properties have not been taken into account in most previous studies. The objective of this study was to determine the coefficients of friction of three commercially available stent grafts (Cook Zenith, Medtronic Endurant, and Vascutek Anaconda), their delivery sheaths, a porcine aorta, and two mock arterial materials. Stent grafts were obtained and separated into stents, graft fabric, and sheaths. Using a custom-made friction measurement apparatus, the coefficients of friction were measured between five material pairs: (i) the stents and inner surface of the sheath, (ii) the graft fabric and inner surface of the sheath, (iii) the outer surface of the sheath and a porcine aorta, (iv) the outer surface of the sheath and three different polyvinyl alcohol (PVA) cryogels, and (v) the outer surface of the sheath and a polydimethylsiloxane (PDMS) sheet. The results show that the coefficients of friction between the graft fabric and the sheath were higher than those between the stents and the sheath. The PVA cryogels showed more comparable frictional properties to the porcine aorta than did the PDMS sheet, suggesting that PVA cryogels provide a more accurate approximation for the in vivo frictional properties. These results can be used to improve the accuracy of computational models for stent graft delivery and deployment and to select appropriate materials for vascular phantoms. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|