Ascending Aorta To Bilateral Femoral Artery Graft

Abstract This paper presents Fluid Structure Interaction modeling of candidate implant materials used in the femoral artery graft medical procedure. Two candidate implant materials, namely Teflon and Dacron are considered and modeled using Computational Fluid Dynamics (CFD) and structural Finite Element Analysis (FEA) to obtain Fluid Structure Interaction (FSI) developed stresses within the candidate materials as a result of non-Newtonian blood flowing in a pulsatile unsteady fashion into the femoral artery implant tube. The pertinent findings for a pulsatile velocity maximum magnitude of 0.3 m/s and period of oscillation of 2.75 sec are as follows. For the biological tissue the wall shear stress is found to be 2.15 × 104 Pa, the hoop stress is found to be 1.6 × 104 Pa. For the Teflon implant material, the wall shear stress is found to be 1.177 × 104 Pa, the hoop stress is found to be 2.2 × 104 Pa. For the Dacron implant material the wall shear stress is found to by 3.9 × 104 Pa, the hoop stress is found to be 2.17 × 104 Pa. Based upon the analysis herein the PTFE material would be recommended.

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Dynamic alterations in cerebral, celiac and renal flows resulting from ascending aorta, subclavian artery and femoral artery cannulations of extracorporeal devices

Perfusion ◽

10.1177/0267659117706606 ◽

2017 ◽

Vol 32 (7) ◽

pp. 561-567 ◽

Cited By ~ 2

Author(s):

Sahin Iscan ◽

Habib Cakir ◽

Bortecin Eygi ◽

Ismail Yurekli ◽

Koksal Donmez ◽

...

Keyword(s):

Blood Flow ◽

Cardiac Output ◽

Femoral Artery ◽

Extracorporeal Circulation ◽

Ascending Aorta ◽

Volume Flow ◽

Roller Pump ◽

Flow Rates ◽

Abdominal Organs ◽

Cannulation Site

Introduction: The aim of this study was to assess the relationships among cardiac output, extracorporeal blood flow, cannulation site, right (RCa) and left carotid (LCa), celiac (Ca) and renal artery (Ra) flows during extracorporeal circulation. Methods: A mock circulatory circuit was assembled, based on a compliant anatomical aortic model. The ascending aorta, right subclavian and femoral artery cannulations were created and flow was provided by a centrifugal pump (Cp); cardiac output was provided by a roller pump (Rp). Five volume flow rates were tested. The Rp was set at 4 L/min with no Cp flow (R4-C0) and the basic volume flow rates of the vessels were measured. The flow of the Cp was increased while the Rp flow was decreased for other measurements; R3-C1, R2-C2, R1-C3 and R0-C4. Measurements were repeated for all cannulation sites. Results: The RCa flow rate at R4-C0 was higher compared to the R3-C1, R2-C2, R1-C3 and R0-C4 RCa flows with subclavian cannulation. The RCa flow decreased as the Cp flow increased (p<0.05). The RCa flow with ascending aortic and femoral cannulation was higher compared to subclavian cannulation. Higher flows were obtained with subclavian cannulation in the LCa compared to the others (p<0.05). R4-C0 Ca and Ra flows were higher compared to other Ca and Ra flows with femoral cannulation. Ca and Ra flows decreased as Cp flow increased. Flows of the Ca and Ra with ascending and subclavian cannulations were not lower compared to the R4-C0 flow (p<0.05). Conclusion: This study shows that prolonged extracorporeal circulation may develop flow decrease and ischemia in cerebral and abdominal organs with both subclavian and femoral cannulations.

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Nonuniform distribution of microspheres in blood flowing through a medium-size artery

Canadian Journal of Physiology and Pharmacology ◽

10.1139/y70-064 ◽

1970 ◽

Vol 48 (6) ◽

pp. 415-421 ◽

Cited By ~ 72

Author(s):

Roderic H. Phibbs ◽

L. Dong

Keyword(s):

Left Ventricle ◽

Radial Distribution ◽

Cross Sections ◽

Femoral Artery ◽

Ascending Aorta ◽

Nonuniform Distribution ◽

Medium Size ◽

Sphere Diameter ◽

Entrance Effect ◽

Vessel Lumen

Suspensions of rigid microspheres, varying from 7.5 to 80 μ diameter, were injected into the left ventricle or ascending aorta of five anesthetized rabbits. After injection, an exposed branch of the femoral artery was frozen ultrarapidly, then removed; after histologic preparation, serial cross sections were studied microscopically. The radial distribution of the spheres within the vessel lumen was uneven, with a progressively decreasing concentration peripherally. This appeared to be proportional to sphere diameter and extended too far in from the periphery to be explained by entrance effect only. Microspheres of 7.5 to 10 μ diameter had the radial distribution which most closely approached that of erythrocytes in these same arteries.

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