Mechanical characteristics of nitinol stent elements

Abstract

The article examines the influence of heat treatment conditions, such as device design and wire tension force, on the mechanical characteristics of nitinol wire stent elements. Stent elements are components of an aortic stentgraft for the surgical treatment of aortic aneurysms. It has been shown that with increasing wire tension force, the radial stiffness of the finished heat-treated stent elements decreases. Therefore, it is necessary to fix the wire on the device, providing a minimum tensile force. For experimental studies, samples of Ti-44.48 wire were taken; Ni-49.16; Cu-6.02 from Fukarawa (Japan) with a diameter of 0.45 mm, used for the manufacture of wire frames of stentgrafts. The results obtained will be proposed for implementation in the technological process of manufacturing medical products from nitinol in the Scientific and Technological Park of BNTU "Polytechnic". After production tests, conclusions will be drawn about the advisability of using them in production conditions.