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Thin-film nitinol (NiTi): A feasibility study for a novel aortic stent graft material
David Rigberg, MD, Allan Tulloch, MD, Youngjae Chun, MS, Kotekar Panduranga Mohanchandra, PhD, Greg Carman, PhD, Peter Lawrence, MD Journal of Vascular Surgery Volume 50, Issue 2, Pages (August 2009) DOI: /j.jvs Copyright © 2009 Society for Vascular Surgery Terms and Conditions
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Fig 1 The lift-off process used to fabricate patterns on thin film nitinol (NiTi) is displayed above schematically. See text for details. DRIE, Deep reactive ion etching; PR, photoresist; Cu, copper; SiO2, silicon dioxide. Journal of Vascular Surgery , DOI: ( /j.jvs ) Copyright © 2009 Society for Vascular Surgery Terms and Conditions
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Fig 2 Bare metal stent and thin-film nitinol (NiTi) before assembly (A). This 37-mm stent graft is also shown collapsed inside a 12F delivery catheter (B). Journal of Vascular Surgery , DOI: ( /j.jvs ) Copyright © 2009 Society for Vascular Surgery Terms and Conditions
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Fig 3 Displayed in longitudinal view is a 37-mm thin-film nitinol (NiTi)-covered stent graft uniformly deployed in a 30 mm pulsatile flow circuit following placement via a 12F delivery catheter. Journal of Vascular Surgery , DOI: ( /j.jvs ) Copyright © 2009 Society for Vascular Surgery Terms and Conditions
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Fig 4 Scanning electron micrograph image of patterned thin-film nitinol (NiTi) demonstrating uniform, diamond-patterned holes. Journal of Vascular Surgery , DOI: ( /j.jvs ) Copyright © 2009 Society for Vascular Surgery Terms and Conditions
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Fig 5 A plot of the bending stiffness ratio of TFN vs ePTFE where a ratio of 0.5 indicates that TFN is half the bending stiffness of expanded polytetrafluoroethylene (ePTFE) (ie, more compliant). In this case, patterned thin-film nitinol (TFN) (red line) is compared to non-patterned TFN (black line). NiTi, Nitinol; Fr, French. Journal of Vascular Surgery , DOI: ( /j.jvs ) Copyright © 2009 Society for Vascular Surgery Terms and Conditions
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