首页 | 本学科首页   官方微博 | 高级检索  
     


Simulation of transcatheter aortic valve implantation: a patient-specific finite element approach
Authors:F. Auricchio  M. Conti  A. Reali
Affiliation:1. Dipartimento di Ingegneria Civile e Architettura (DICAr), Università degli Studi di Pavia, Via Ferrata 1, 27100, Pavia, Italy;2. Istituto di Matematica Applicata e Tecnologie Informatiche (IMATI-CNR), Pavia, Italy;3. Centro di Simulazione Numerica Avanzata (CESNA-IUSS), Pavia, Italy
Abstract:Until recently, heart valve failure has been treated adopting open-heart surgical techniques and cardiopulmonary bypass. However, over the last decade, minimally invasive procedures have been developed to avoid high risks associated with conventional open-chest valve replacement techniques. Such a recent and innovative procedure represents an optimal field for conducting investigations through virtual computer-based simulations: in fact, nowadays, computational engineering is widely used to unravel many problems in the biomedical field of cardiovascular mechanics and specifically, minimally invasive procedures. In this study, we investigate a balloon-expandable valve and we propose a novel simulation strategy to reproduce its implantation using computational tools. Focusing on the Edwards SAPIEN valve in particular, we simulate both stent crimping and deployment through balloon inflation. The developed procedure enabled us to obtain the entire prosthetic device virtually implanted in a patient-specific aortic root created by processing medical images; hence, it allows evaluation of postoperative prosthesis performance depending on different factors (e.g. device size and prosthesis placement site). Notably, prosthesis positioning in two different cases (distal and proximal) has been examined in terms of coaptation area, average stress on valve leaflets as well as impact on the aortic root wall. The coaptation area is significantly affected by the positioning strategy ( ? 24%, moving from the proximal to distal) as well as the stress distribution on both the leaflets (+13.5%, from proximal to distal) and the aortic wall ( ? 22%, from proximal to distal). No remarkable variations of the stress state on the stent struts have been obtained in the two investigated cases.
Keywords:transcatheter aortic valve  finite element analysis  patient-specific modelling
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号