جستجوی مقالات مرتبط با کلیدواژه « رگ محیطی » در نشریات گروه « مواد و متالورژی »

One of the relatively new treatments for vascular occlusion is the use of stenting as one of the main options. In the meantime, Nitinol shape memory alloy stents can be used for peripheral artery owing to reducing problems such as low torsional capability, insufficient radial strength and improper dynamic behavior compared to other stents. One of the major challenges in the stenting process, as a treatment for artery stenosis, is the complexity of stent contact with the peripheral artery. In this paper, using finite element simulation, due to the special importance of mechanical and clinical properties of stents, by selecting two types of stents made of shape memory alloys with different metallurgical and mechanical properties, their behavior with peripheral artery was investigated. Material properties model of Nitinol shape memory alloy was based on Helmholtz free thermodynamic energy (Auricchio model). With varying the Af temperature from 20 to 30 ° C, the difference between the upper and lower plateau stresses was about 35 MPa (equivalent to about 12%). Moreover, with changing the Af temperature about 10 ° C, NiTi shape memory alloy stents have better mechanical and clinical performance due to good applied force to the artery, optimal radial strength, and complete hysteresis loop depending on superelastic behavior, less stress, more strain, reduction of the probability of injury and clogging of the peripheral artery by 22.15%, lower level of stress required to cause super-elastic behavior by 35.82% and high reliability of about 3 times. This numerical study can provide a good way to investigate the mechanical behavior of stents used in peripheral blood artery with respect to the effects of metallurgical and mechanical properties of shape memory alloy stents.