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Importance of stent-graft design for aortic arch aneurysm repair

1 Deakin University, Institute for Frontier Materials, Geelong, VIC, Australia
2 School of Engineering, Swinburne University of Technology, Hawthorn, VIC 3122, Australia

Aneurysm of the aorta is currently treated by open surgical repair or endovascular repair. However, when the aneurysm occurs in regions between the aortic arch and proximal descending aorta, it can be a complex pathology to treat due to its intricate geometry. When complex aortic aneurysms are treated with the conventional procedures, some of the patients present with significant post-operative complications and high mortality rate. Consequently, a clinically driven hybrid innovation known as the frozen elephant trunk procedure was introduced to treat complex aortic aneurysms. Although this procedure significantly reduces mortality rate and operating time, it is still associated with complications such as endoleaks, spinal cord ischemia, renal failure and stroke. Some of these complications are consequences of a mismatch in the biomechanical behaviour of the stent-graft device and the aorta. Research on complex aneurysm repair tended to focus more on the surgical procedure than the stent-graft design. Current stent-graft devices are suitable for straight vessels. However, when used to treat aortic aneurysm with complex geometry, these devices are ineffective in restoring the normal biological and biomechanical function of the aorta. A stent-graft device with mechanical properties that are comparable with the aorta and aortic arch could possibly lead to fewer post-operative complications, thus, better outcome for patients with complex aneurysm conditions. This review highlights the influence stent-graft design has on the biomechanical properties of the aorta which in turn can contribute to complications of complex aneurysm repair. Design attributes critical for minimising postoperative biomechanical mismatch are also discussed.
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Keywords aortic aneurysm; stent-graft; hemodynamics; compliance; spinal cord ischemia

Citation: C Singh, X Wang, Y Morsi, CS Wong. Importance of stent-graft design for aortic arch aneurysm repair. AIMS Bioengineering, 2017, 4(1): 133-150. doi: 10.3934/bioeng.2017.1.133

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