alexa Numerical Simulation of Blood Flow in Double-Barreled C
ISSN: 2329-6925

Journal of Vascular Medicine & Surgery
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Research Article

Numerical Simulation of Blood Flow in Double-Barreled Cannon EVAR and its Clinical Validation

Rui-Hung Kao1#, Wei-Ling Chen2#, Tzong-Shyng Leu1, Tainsong Chen2 and Chung-Dann Kan3*

1Department of Aeronautics and Astronautics, National Cheng Kung University, Tainan, Taiwan

2Department of Biomedical Engineering, National Cheng Kung University, Tainan, Taiwan

3Department of Surgery, National Cheng Kung University Hospital, Tainan, Taiwan

#These authors contributed equally to this work and should be considered co-first authors

*Corresponding Author:
Chung-Dann Kan
Department of Surgery
National Cheng Kung University Hospital
Tainan, Taiwan
Tel: +886-6-235-3535 ext 3497
E-mail: [email protected]

Received Date: July 14, 2014; Accepted Date: October 17, 2014; Published Date: October 20, 2014

Citation: Kao RH, Chen WL, Leu TS, Chen T, Kan CD (2014) Numerical Simulation of Blood Flow in Double-Barreled Cannon EVAR and its Clinical Validation. J Vasc Med Surg 2:160. doi: 10.4172/2329-6925.1000160

Copyright: © 2014 Kao RH, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

 

Abstract

The Double-Barreled cannon stent-graft Aortic Repair (DoBAR) strategy is a specific method for fixing extremely dilated aortic landing-zone issue. Its clinical validation and application may be examined using computational schemes. Three assumed conditions: the single stent-graft, the longitudinal direction (LD)-type DoBAR, and the sagittal direction (SD)-type DoBAR models were examined by computational fluid dynamics (CFD) simulations. Two specific points in one cardiac cycle were plotted. The non-dimensional frequency parameters were calculated to evaluate the flow field stabilities. The primary axial flow skewed from inner to outer aortic portion after passing through the aortic arch at peak forward-flow time (PFFT) and formed the swing signature at peak reverse-flow time (PRFT). The secondary flow developed as counter-rotating vortices of this model. In LD-type, the septum of antero- posterior chambers separated the primary flow to form two individual axial flows, the morphology resembled as the single model at PFFT. In SD-type, the septum of outer-inner chambers divided the flow pathway into two layers, and then weakened the reversed flow strength at PRFT. The septum of the DoBAR limited the development of secondary flow and the swing pattern disappeared in both types. The Strouhal and Wormersly numbers showed the flow pulsatility intensity decreased with steadier flow in both DoBAR models. The Dean numbers disclose the SD-type had weaker axial velocity and weaker secondary flow

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