scholarly journals Experimental study of the flow in the elastic model of the abdominal aortic bifurcation

2021 ◽  
Vol 2103 (1) ◽  
pp. 012221
Author(s):  
D E Sinitsina ◽  
D K Zaitsev
Keyword(s):  
Blood Flow ◽  
Pulsating Flow ◽  
Elastic Model ◽  
Aortic Bifurcation ◽  
Hydraulic Circuit ◽  
Flow Conditions ◽  
Abdominal Aortic ◽  
Elastic Vessel ◽  
Flow Oscillations ◽  
Flow Simulator

Abstract This paper reflected preliminary results of physical modeling of pulsating flow in a model of abdominal aortic bifurcation with taking into account the physiological elasticity of the vessel walls. Elastic vessel models were made via molding from a silicone mixture based on Lasil-T4 silicone rubber. The auxiliary study was performed to assess the elastic properties of the silicone mixture and select a necessary composition. The experiment on the pulsating flow in the rigid and elastic models of the abdominal aortic bifurcation was carried out using a blood flow simulator with circulation of blood-emulating fluid. It was revealed that interaction between the elastic model and closed rigid circuit of the blood flow simulator resulted in generation of intense parasite flow oscillations and prevented from getting similar flow conditions for rigid and elastic models. A way to solve the problem is to include dampers with liquid in the hydraulic circuit of the blood flow simulator at the inlet and the outlets of the elastic model.

Influence of Abdominal Aortic Curvature and Resting Versus Exercise Conditions on Velocity Fields in the Normal Abdominal Aortic Bifurcation

1994 ◽  
Vol 116 (3) ◽  
pp. 347-354 ◽  
Author(s):  
Erik Morre Pedersen ◽  
Hsing-Wen Sung ◽  
Ajit P. Yoganathan
Keyword(s):  
Abdominal Aorta ◽  
Flow Model ◽  
Laser Doppler Anemometry ◽  
Wave Form ◽  
Aortic Bifurcation ◽  
Flow Conditions ◽  
Abdominal Aortic ◽  
Flow Divider ◽  
Rest Condition ◽  
Secondary Velocity

Local hemodynamics are considered an important atherogenetic factor in the abdominal aortic bifurcation. This study addresses the quantitative flow fields in a pulsatile flow model of a normal abdominal aortic bifurcation when encountering realistic upstream anatomy, realistic inlet flow conditions and different physiologic flow conditions (rest vs. exercise). Two-dimensional laser Doppler anemometry measurements gave axial as well as radial velocities. The localization and magnitude of peak velocities, retrograde flow and secondary velocity patterns were found to be determined to a great extent by the curvature of the abdominal aorta, the triphasic flow wave form and the inlet velocity profile. Significant changes were also seen when simulating different physiologic flow conditions. Thus retrograde velocities were present at both the flow divider and the lateral vessel wall for the rest condition but not for the exercise flow conditions, and the location of low and retrograde velocities during diastole were as much determined by abdominal aortic curvature as by the bifurcation for nearly all flow conditions and locations. In conclusion, the anatomy and hemodynamics in the abdominal aorta cannot be neglected when studying the hemodynamics in the abdominal aortic bifurcation.

A NUMERICAL STUDY ON THE HEMODYNAMIC AND SHEAR STRESS OF DOUBLE ANEURYSM THROUGH S-SHAPED VESSEL

2015 ◽  
Vol 27 (04) ◽  
pp. 1550033 ◽  
Author(s):  
Mahdi Halabian ◽  
Alireza Karimi ◽  
Borhan Beigzadeh ◽  
Mahdi Navidbakhsh
Keyword(s):  
Blood Flow ◽  
Mechanical Behavior ◽  
Numerical Study ◽  
Flow Characteristics ◽  
Flow Simulation ◽  
The Body ◽  
Sweep Angle ◽  
Abdominal Aortic ◽  
Hemodynamic Characteristics ◽  
Refined Meshes

Abdominal aortic aneurysm (AAA) is a degenerative disease defined as the abnormal ballooning of the abdominal aorta (AA) wall which is usually caused by atherosclerosis. The aneurysm grows larger and eventually ruptures if it is not diagnosed and treated. Aneurysms occur mostly in the aorta, the main artery of the chest and abdomen. The aorta carries blood flow from the heart to all parts of the body, including the vital organs, the legs, and feet. The objective of the present study is to investigate the combined effects of aneurysm and curvature on flow characteristics in S-shaped bends with sweep angle of 90° at Reynolds number of 900. The fluid mechanics of blood flow in a curved artery with abnormal aortic is studied through a mathematical analysis and employing Cosmos flow simulation. Blood is modeled as an incompressible non-Newtonian fluid and the flow is assumed to be steady and laminar. Hemodynamic characteristics are analyzed. Grid independence is tested on three successively refined meshes. It is observed that the abrupt expansion induced by AAA results in an immensely disturbed regime. The results may have implications not only for understanding the mechanical behavior of the blood flow inside an aneurysm artery but also for investigating the mechanical behavior of the blood flow in different arterial diseases, such as atherosclerosis.

Pulse oximeter signal at various blood flow conditions in anin vitro model

1995 ◽  
Vol 33 (1) ◽  
pp. 87-91 ◽  
Author(s):  
L. -G. Lindberg ◽  
M. Vegfors ◽  
C. Lennmarken ◽  
P. Å. Öberg
Keyword(s):  
Blood Flow ◽  
Pulse Oximeter ◽  
Flow Conditions ◽  
Vitro Model

Numerical Simulation of Pulsating Flow over Blood Vessel Robot

2012 ◽  
Vol 591-593 ◽  
pp. 1734-1738
Author(s):  
Chun Yan Huang ◽  
Fan Jiang
Keyword(s):  
Numerical Simulation ◽  
Boundary Condition ◽  
Blood Flow ◽  
Blood Vessel ◽  
Surface Pressure ◽  
Blood Parameters ◽  
Pulsating Flow ◽  
Inlet Velocity ◽  
Blood Density

In order to study the influence of pulsating blood flow to robot and blood vessel, UDF programming of the inlet velocity is defined as the boundary condition, and the model simulate the turbulent blood flow. Moreover, in this situation, this paper analyzes the influence caused by blood parameters for the biggest surface pressure on robot. The results are showed that the variation of pressure and velocity is different on different position at 0.08s and 0.27s, and the surface pressure of the robot become greater by the increase of blood density or viscosity.

scholarly journals Alterations of blood flow pattern after triple stent endovascular treatment of saccular abdominal aortic aneurysm: a porcine model.

2016 ◽  
Vol 43 (3) ◽  
pp. 154-159
Author(s):  
JAHIR RICHARD DE OLIVEIRA ◽  
MAURÍCIO DE AMORIM AQUINO ◽  
SVETLANA BARROS ◽  
GUILHERME BENJAMIN BRANDÃO PITTA ◽  
ADAMASTOR HUMBERTO PEREIRA
Keyword(s):  
Blood Flow ◽  
Abdominal Aortic Aneurysm ◽  
Aortic Aneurysm ◽  
Endovascular Treatment ◽  
Flow Pattern ◽  
Blood Flow Pattern ◽  
Large White ◽  
Abdominal Aortic ◽  
Before And After ◽  
Infrarenal Abdominal Aorta

ABSTRACT Objective: to determine the blood flow pattern changes after endovascular treatment of saccular abdominal aortic aneurysm with triple stent. Methods: we conducted a hemodynamic study of seven Landrace and Large White pigs with saccular aneurysms of the infrarenal abdominal aorta artificially produced according to the technique described. The animals were subjected to triple stenting for endovascular aneurysm. We evaluated the pattern of blood flow by duplex scan before and after stent implantation. We used the non-paired Mann-Whitney test for statistical analysis. Results: there was a significant decrease in the average systolic velocity, from 127.4cm/s in the pre-stent period to 69.81cm/s in the post-stent phase. There was also change in the flow pattern from turbulent in the aneurysmal sac to laminate intra-stent. Conclusion: there were changes in the blood flow pattern of saccular abdominal aortic aneurysm after endovascular treatment with triple stent.

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