Document Type : Article
Authors
1
Department of Mechanical Engineering, Faculty of Engineering, Urmia University, Urmia, Iran
2
Deartment of Mechanical Engineering, Faculty of Engineering. Urmia University, Urmia. Iran
3
Department of Materials, Mechanics, Management & Design (3MD), Faculty of Civil Engineering and Geosciences, Delft University of Technology, Delft,, Netherlands
Abstract
Cardiovascular diseases cause many problems for patients, and the main reason is associated with arteriosclerosis. According to the American Heart Association, atherosclerosis is a condition caused by the accumulation of a substance called plaque in the walls of arteries. Today, special methods are used to help the patient survive in the event of a heart attack and diagnose the patient's condition. One of the safest methods in medical science is to use a stent. Despite all the innovations in the design of cardiovascular stents, the metal stents that are commonly used cause various problems such as corrosion, infection and restenosis, which lead to physical problems or even death of patients. In order to minimize the problems associated with metal stents, new materials such as polymers are now being developed. On the other hand, the development of polymer-based vascular scaffolds requires a new structural geometry, because these polymeric materials have significantly less radial strength than metal alloys. In this study, the stiffness and flexibility of commercial polymer stents were investigated using analytical relationships and the finite element method, and it was shown that there is a good correlation between these two methods. Then a new design for a zigzag stent is introduced to make it less sensitive to changes in thickness to increase its radial strength. Finally, Taguchi method and analysis of variance were used to design the experiment and determine the effect of stent geometric parameters including strut width, bridge width and stent thickness on the flexibility of this type of stent. The results showed that the width of the bridge and the strut have the greatest effect on the flexibility of the stent, respectively, and the change in stent thickness, which is an effective parameter in the radial strength of the stent, has no significant effect on the flexibility of this type of stent.
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