Coronary artery disease is the most common type of heart diseases and the leading cause of
death worldwide due to heart disease. It occurs when the arteries that supply blood to the
heart become narrowed or blocked by a buildup of cholesterol and other material at the inner
wall of the artery. Limitation of blood flow to the heart causes ischemia of the myocardial
cells. Myocardial cells may die from lack of oxygen and this is called a myocardial infarction
- or more commonly: a heart attack. Treatment options include medication surgery or
catheter-based procedures. Several types of catheter-based procedures are available. During
balloon angioplasty a special balloon catheter is passed into the narrowed segment of the
artery and expands the balloon which thus opens the artery and compresses the blockage against
the wall of the artery. Stents are very small metal mesh-tubes that can be inserted via a
balloon catheter into the narrowed segment of the artery. When the balloon is inflated the
stent expands and is embedded into the artery vessel wall which thus opens the previously
narrowed segment of artery. The balloon is then deflated and removed along with the catheter
and the stent is left behind to serve as a metal framework for the artery. In case of drug
eluting stents a certain amount of anti-flammating drug is loaded in the coating over the base
stent. This drug is released at the wall of diseased artery so that restenosis cannot take
place at the place of artery where the stent has been implanted. In this thesis a drug eluting
stent was studied where there was a biodegradable coating over a bare metal stent in which
there was some amount of therapeutic drug. The degradation of the biodegradable coating layer
thickness was determined with respect to time which was actually representing the remaining
drug concentration in the coating layer. Then using this variable drug concentration as the
drug concentration at initial tissue layer concentration profile of drug in tissue layer with
respect to time and position was determined using finite volume algorithm where this algorithm
was coded using MATLAB programming language.
