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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)