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Modelling a Nitinol device for the repair of abdominal aortic aneurysms

McCummiskey, E. and Dempster, W.M. and Nash, D.H. and Ashton, T.R. and Stevenson, D.G. (2008) Modelling a Nitinol device for the repair of abdominal aortic aneurysms. In: Proceedings of the ASM International Conference on Shape Memory and Superelastic Technologies, 2006-05-07 - 2006-05-11.

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Abstract

Abdominal aortic aneurysms (AAAs) are areas of localised swelling in the abdominal aorta due to a weakening of the arterial wall. The performance of a nitinol endovascular device for AAA repair is primarily dictated by its ability to seal the aneurysm from the blood flow and endure continuous cyclic loading due to blood pressure pulsations. The functionality of the device relies heavily on the use of superelastic nitinol to withstand the large deformations that occur during deployment and operation of the device. In the present work the proximal ring of the device is modelled using FE analysis to ascertain the strain levels in vivo. Tests on the material have been carried out to establish its specific stress-strain characteristic in the development of the FE model and both compression-tension dissimilarities and low magnitude cycling effects have been investigated.