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Computer modeling for the prediction of thoracic aortic stent graft collapse  Salvatore Pasta, PhD, Jae-Sung Cho, MD, Onur Dur, PhD, Kerem Pekkan, PhD,

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Presentation on theme: "Computer modeling for the prediction of thoracic aortic stent graft collapse  Salvatore Pasta, PhD, Jae-Sung Cho, MD, Onur Dur, PhD, Kerem Pekkan, PhD,"— Presentation transcript:

1 Computer modeling for the prediction of thoracic aortic stent graft collapse 
Salvatore Pasta, PhD, Jae-Sung Cho, MD, Onur Dur, PhD, Kerem Pekkan, PhD, David A. Vorp, PhD  Journal of Vascular Surgery  Volume 57, Issue 5, Pages (May 2013) DOI: /j.jvs Copyright © 2013 Society for Vascular Surgery Terms and Conditions

2 Fig 1 View of the thoracic aortic stent graft protrusion (model with protrusion extension [PE] = 1.1 cm and θ = 10 degrees) placed into the aortic arch model and schematic representation of the geometric parameters used to define the protrusion geometry. Journal of Vascular Surgery  , DOI: ( /j.jvs ) Copyright © 2013 Society for Vascular Surgery Terms and Conditions

3 Fig 2 A, Experimentally derived force vs displacement curve of a Gore TAG endoprosthesis under radial compression testing. B, Computational mesh of thoracic aortic stent graft model used to simulate radial compression testing. C, Deformed (meshed solid model) and undeformed (gray solid model) geometry of thoracic aortic stent graft under compression displacement of 0.72 cm showing the boundary area (BA) where reaction force was evaluated. Journal of Vascular Surgery  , DOI: ( /j.jvs ) Copyright © 2013 Society for Vascular Surgery Terms and Conditions

4 Fig 3 A, Map of pressure distribution of aortic model without thoracic aortic stent graft at peak systolic. B, Distribution of von Mises wall stress induced by hemodynamic loads at peak systole. View (A-A) on center bottom displays maximum value of peak systolic pressure and von Mises wall stress. Journal of Vascular Surgery  , DOI: ( /j.jvs ) Copyright © 2013 Society for Vascular Surgery Terms and Conditions

5 Fig 4 A and B, Streamlines of blood flow velocity in aortic model without a thoracic aortic stent graft (TASG) (A) and with a TASG (B) (protrusion extension [PE] = 1.1cm and θ = 10 degrees) at peak systole. The cross sections B-B (inset in the bottom) show the peak systolic pressure in a cross section of the aorta with and without TASG. C, Transmural pressure gradient across the TASG wall protrusion for all geometries at cross section B-B. Journal of Vascular Surgery  , DOI: ( /j.jvs ) Copyright © 2013 Society for Vascular Surgery Terms and Conditions

6 Fig 5 A, Distribution of von Mises stress and streamlines of blood velocity during acceleration, peak systole, and deceleration for the model with protrusion extension (PE) = 2.0 cm and θ = 10 degrees. The tip of the thoracic aortic stent graft in the deformed model (D) shows infolding compared withthe undeformed model (U), whereas vortices of blood velocity streamlines increase significantly during deceleration. B, Thoracic aortic stent graft diameter at peak systole for all geometries. Journal of Vascular Surgery  , DOI: ( /j.jvs ) Copyright © 2013 Society for Vascular Surgery Terms and Conditions

7 Fig 6 Distribution of luminal pressure for all aortic models with different geometries of thoracic aortic stent graft wall protrusion at peak systole. PE, Protrusion extension. Journal of Vascular Surgery  , DOI: ( /j.jvs ) Copyright © 2013 Society for Vascular Surgery Terms and Conditions

8 Fig 7 Streamlines of blood flow velocity for all aortic models with different thoracic aortic stent graft wall protrusions at peak systole. PE, Protrusion extension. Journal of Vascular Surgery  , DOI: ( /j.jvs ) Copyright © 2013 Society for Vascular Surgery Terms and Conditions

9 Fig 8 Volumetric flow rates (A) and blood perfusion pressure (B)through the left subclavian artery (LSA) over the cardiac cycle. For the model without the endograft, flow rate and blood perfusion are 0.55L/min and 116 mm Hg. PE, Protrusion extension. Journal of Vascular Surgery  , DOI: ( /j.jvs ) Copyright © 2013 Society for Vascular Surgery Terms and Conditions

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