Czasopismo | INŻYNIERIA MATERIAŁOWA | Rocznik 2013 - zeszyt 4

Effect of material and geometry on dogboning in coronary stent

nr katalogowy: 79710

Stent is an elastic metal tube with cylindrical shape and a size of a few millimeters which is inserted inside a blood vessel in order to prevent flow constriction [1]. The problems of development of functional properties of coronary stents should be considered in the aspect of choosing metal biomaterials for a particular type of stent. In particular this is connected with miniaturization of stent design and methods of its implantation. Therefore, it is necessary to specify quantitative relationships related to chemical and phase composition of the microstructure and mechanical properties of biomaterials. When designing stents, the following biomechanical problems should be considered: (1) implantation and expansion procedures (e.g. balloon-expandable, self-expandable), (2) materials used for stents and (3) spatial structures. A key problem is to understand the effect of the structure on biomechanical behaviour of the stent during implementation. The biomaterial implanted into the circulatory system cannot cause irreversible damage to the structure of proteins, obstruct enzyme effect, induce changes in the electrolyte balance and damage morphotic blood elements [2, 3]. Over more than two decades of their application, stents have been gradually modified. Initially, the stents were chiefly made of 316L stainless steel. Recent years have seen growing popularity of stents made of cobalt-chromium alloys which allow to reduce diameters of stent parts and cross-sections of the non-expanded stents. Low profile of a stent makes the insertion through winding sections of blood vessels and tight and calcified stenosis easier. Other materials used for production of stents, such as titanium, tantalum, platinum and iridium alloys or nitinol have not catch on so much as cobalt-chromium solutions [4]. Deposition of the coatings that gradually release drugs, coatings with radioactive layers, coatings made of gold, polymers and silicones are amo[...]

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