Finite element analysis of a percutaneous aortic valve stent design

Gideon Praveen Kumar, Lazar Mathew

.

DOI: 10.4236/health.2009.11002                

Abstract

Aim: This paper discusses the design and Finite Element Analysis (FEA) of a Percutaneous Aor-tic Valve Stent. The aim of this study was to model a percutaneous aortic valve stent and subject it to finite element analysis. The design process was carried out to meet the functional and surgical requirements. Methods and Results: Analysis was done with different materials with loads ranging from 50 kgf/mm² to 73 kgf/mm². These forces were selected because these val-ues are far greater than the normal human blood pressure which ranges from 10kPa to 16kPa. It was also to understand the mechanical behavior of different stent materials under such high pressures. A stent model was generated and its physical, mechanical and behavioral properties were studied. Finite element analysis and simulation of the model enhanced the designer to optimize the geometry suitable for perform-ance during and after implantation. The design objective for the stent is to have long term du-rability, low thrombogenicity, resistance to mi-gration and paravalvular leak. Conclusion: The analysis performed in this paper may aid in understanding the stent’s tolerable pressures ranges in comparison with the physiological pressures exerted by the heart and cardiac blood flow during abnormal cardiovascular conditions.

Keywords

Stent; Finite Element Analysis; Blood Flow; Aortic Valve Stenosis; Port Size

Conflicts of Interest

The authors declare no conflicts of interest.

References

[1]	C. M. Allison, D. Crossman, and J. Gunn, (2004) The influence of physical stent parameters upon restenosis, Elsevier SAS.
[2]	K. W. Lau, A. Johan, U. Sigwart, and J. S. Hung, (2004) A stent is not just a stent: stent construction and design do matter in its clinical performance, Singapore Medical Journal.
[3]	D. R. McClean and N. Eigler, (2002) Stent design: Im-plications for restenosis, MedReviews, LLC.
[4]	(2004) Stent design properties and deployment ratio in-fluence indexes of wall shear stress: A three-dimensional computational fluid dynamics investigation within a normal artery, J Appl Physiol, 97, 424-430.
[5]	(2000) An overview of superelastic stent design, Min Invas Ther & Allied Technol, 9(3/4), 235-246.
[6]	(2007) Engineering aspects of stents design and their translation into clinical practice, Ann Ist super sAnItà, 43(1), 89-100.
[7]	(2005) To stent or not to stent aortic dissection:good news for a chosen few, but who? European Heart Journal, 26, 431-432, doi:10.1093/eurheartj/ehi119.
[8]	J. Q. Zhou, A. F. Corno, C. H. Huber, P. Tozzi, and L. K. von Segesser, (2003) Self-expandable valved stent of large size: off-bypass implantation in pulmonary position, Eur. J. Cardiothorac. Surg., 24(2), 212-216.
[9]	G. P. Kumar and L. Mathew, (2009) New stent design for percutaneous aortic valve replacement, International Journal of Cardiovascular Revascularization Medicine, 10(2), 121-124.