Biomedical Engineering Reference
In-Depth Information
Fig. 8.58
First principal
stress distribution: (
a
)
front
view
, (
b
)
back view
wall shear stress regions, while the FSI simulation gives a large area of low wall
shear stress right downstream of the aneurysm.
One advantage of using FSI is the ability to capture the mechanical stress dis-
tribution within the arterial wall. This complements the fluid flow analysis to gain
a better understanding of the vascular disease. In this case study, the first principal
stress was used for mechanical stress analysis. Figure
8.58
presents the stress distri-
bution of the AAA model at the peak systole event. The upper and lower shoulder
of the aneurysm experiences extremely high principal stress, which is greater than
0.1 MPa, and peaks at the lower shoulder of the aneurysm at a value of 0.15 MPa,
while all other regions are exposed to a first principal stress under 0.04 MPa. This
indicates the lower shoulder of the aneurysm is exposed to a high mechanical load-
ing due to the pulsatile blood flow, and faces a high risk of rupture.
8.6.3
Closure
Aneurysmal disease and its progression is a complex multifactorial process, and
the FSI method is able to offer a representation of the aneurysmal wall deformation
behaviour and blow flow haemodynamics inside the aneurysm. By implementing
proper flow boundary conditions and arterial wall elasticity properties, high risk
rupture locations can be accurately predicted. This modelling approach can con-
tribute towards a non-invasive diagnosis of aneurysm rupture examination. Such
diagnostic capabilities can provide a refined diagnostic and decision assistance for
treating physicians when performing vascular disease diagnosis.
Search WWH ::
Custom Search