Investigating side branch access of coronary artery stents

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Supervisor:
Károly Dóra
Department of Materials Science and Engineering

Cardiovascular diseases lead death statistics in worldwide, affect more than 50 percent of the hungarian population. Within this group the most common cause of death is coronary artery disease, which means that on the blood vessel’s wall socalledplaque develops, which is a fatty, calcariferous subsidence. This plaque can block or narrow the flow of blood that can cause heart failure.

One of the most widely used method of treating is the stent implantation. The stent is a short, metallic, tubular mesh, which is crimped to a balloon catheter to reach the narrow area. After the dilation of the balloon the catheter is removed and the stent compresses the plaque and supports the vessel wall, this ensuring the free flow of blood, so blood flow is restored in isolated areas.

In special cases, the devices must be implanted for bifurcation. The bifurcation is essentially the branching of the main vessel to two side vessels. When it is bifurcation lesions if the stenosis in at least one branch is close to the branch. In bifurcation stent, doctors should use either dedicated bifurcation stents or plain straight stents with different special expansional techniques. The treatment of bifurcation lesions for doctors is challenging, but very few technical publications deal with this problem.

In the present study, I examine the functional properties of stents such as profile diameter, stent lengths, recoil and percentage of shortening of on expansion and so on; within side bracnh access forecast and the side branch expansion of examination of my study. I measured the possibility of lateral access based on the stent pattern. And i needed a vessel model for the expansion. We can model anatomical conditions well and we can even help doctors as an educational tool.

After comparing the models found in literature, I developed a vascular model with a 3D design program, in which we can examine the changes deformations. I have made the model produced with additive technology and examined the lateral expansion process.

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