Abstract 348: A Novel Self Expanding Stent Technology for treatment of Aortic Aneurysms - Finite Element Analysis
Background: To investigate a novel self-expanding Nitinol stent model in treatment of aortic aneurysms.
Methods: A novel large self-expanding Nitinol stent method was designed with strut thickness of 70µM x 70µM width and it was deployed in a virtual aneurysm model of 6cm wide x 6cm long fusiform hyper-elastic anisotropic model. At cell width of 9mm, there was no buckling of the deployed stent. The peak wall stress and stress-strain properties of the aortic aneurysm wall; and the adjacent normal segments of aorta were studied at various pressures with or without stent. The radial force of the stents was tested after parametric variations. A prototype 300µM x 150µM stent with cell width of 9mm was evaluated similarly for maximal stress distribution after embedding in the aortic wall and with a tissue overgrowth of 1mm over the stent.
Results: The 300µM x 150µM stent reduced the peak wall stress by 70% in the aneurysm and 50% reduction in compliance after a tissue overgrowth of 1mm over the stent struts.
Conclusions: There is potential for a novel Nitinol based self-expanding stent in the therapy of aortic aneurysms.
- © 2013 by American Heart Association, Inc.