Resumo

ABAD-RODRIGUEZ, Rut Lay et al. Design and modeling proposal for a balloon expandable aortic valve stent. Ingeniería Mecánica [online]. 2024, vol.27, n.1, pp. 27-34.  Epub 16-Jun-2024. ISSN 1815-5944.

The present work consists of proposing a new design of balloon-expandable aortic valve stent for use in patients with aortic valve stenosis. Finite element simulations were carried out to determine the Von Mises stresses and deformations and thereby select the design parameters of this device, which will allow its manufacturing and proper operation. The symmetrical condition of the stent facilitated the modeling process, as well as the determination of the smallest reduced diameter of the stent, a necessary condition for it to be moved safely within the artery. In this analysis, 316L stainless steel was used, an elastoplastic, isotropic and homogeneous behavior of the material was considered, also varying the thickness and radius of curvature at the ends of the stent sections. Loads were applied at the joints of these sections, obtaining equivalent stresses below the resistance limit of the material and above the elastic limit. The greatest reduction in stent diameter was obtained with a wire thickness of 0.5 mm and a radius of curvature of 0.5 mm. The mean diameter of the open device (22.987 mm) was reduced to 7.65 mm when applying a pressure of 43.8 MPa.

Palavras-chave : reduced stent diameter; finite elements; expandable stent.

        · resumo em Espanhol     · texto em Espanhol     · Espanhol ( pdf )