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Student name:
Tomer Meirson
Department:
Medical Engineering
Advisor name:
Dr. Idit Avrahami &
Dr. Gil Bolotin
Research Project Numerical Analysis of Flow in
Coronary Artery Bypass Graft
תערוכת פרויקטי גמר 2013 1
INTRODUCTION
The most commonly used conduits in Coronary Artery
Bypass Graft (CABG) procedures, the Greater Saphenous
Veins (GSV), suffer from relatively low patency rates
which lead to graft failures. In order to mitigate the
pathological processes, an External Mesh Support (EMS)
which is deployed over the graft (fig. 1), has been
suggested.
OBJECTIVE
The present research includes investigation of
the time dependent stresses and flow fields
developed in the Saphenous vein graft with and
without EMS, along the cardiac cycle, using
numerical simulations. In the poster only the flow
analysis will be presented.
METHODS
• Six different GSV models at 12 months post transplantation were
constructed based on angiography scans. Three unsupported Vs.
three supported models (fig 2).
• The commercial software ADINA was used to solve the set of
equations.
• Pulsatile flow rate with an average perfusion of 67 ml/min (fig 3).
• models consisted ~150,000 3D fluid elements (fig 4).
Figure 1: Image of CABG grafts (left)
and VGS graft with EMS
The fluid domain
At the boundaries
0 = ⋅∇ V
0
0
=
=
r
i
v
v
No slip
No penetration
g V
V
ρ ρ + ∇+ −∇= 2
p
Dt
D
Figure 4: Model mesh
Inlet flow
0
0.5
1
1.5
2
0 0.5 1 1.5 2
Normalized Flow [ml/sec]
Time [sec]
Flow
Figure 3: Geometric model with
boundary conditions
Figure 2: Angiographic scans of unsupported (A,B,C) and
supported grafts (D,E,F)