Mechanical Response of a Metallic Aortic Stent—Part I: Pressure-Diameter Relationship
Author:
Wang R.1, Ravi-Chandar K.1
Affiliation:
1. Center for Mechanics of Solids, Structures and Materials, The University of Texas at Austin, Austin, TX 78712-1085
Abstract
The mechanical response of a metallic stent is considered in this series of two papers. In Part I, the development of a test method for the characterization of the mechanical response of a metallic aortic stent subjected to internal or external pressure, and a model that captures the relationship between the pressure and diameter of the stent based on slender rod theory are described. The axial and radial deformation of a bare-metal stent were measured as the stent was subjected to loading ranging from an external pressure of about 80 mm of Hg to an internal pressure of about 160 mm of Hg. The pressure was applied using a polyethylene bag; the method of applying the pressure and measuring the strains was found to provide an accurate determination of the mechanical behavior of the stent. The stent was shown to exhibit two stiff limiting states corresponding to the fully collapsed and fully expanded diameters and an intermediate range between the two where the stiffness was an order of magnitude smaller than the typical stiffness of an aorta. A complete mathematical characterization of the pressure-diameter response of the wire stent was also developed; this model is a straightforward application of the theory of slender rods to the problem of the stent. Excellent agreement with the experimental measurements is indicated, opening the possibility for modeling of the coupled response of the stent and the vessel into which it is inserted. In Part II, we consider the effect of variations of pressure over the length of the stent that introduce changes in the diameter along the length of the stent which leads naturally to the formulation of the coupled problem of the stent within the blood vessel.
Publisher
ASME International
Subject
Mechanical Engineering,Mechanics of Materials,Condensed Matter Physics
Reference22 articles.
1. Ruiz, C. E., Zhang, H. P., Douglas, J. T., Zuppan, C. W., and Kean, C. J. C., 1995, “A Novel Method for Treatment of Abdominal Aortic Aneurysms Using Percutaneous Implantation of a Newly Designed Endovascular Device,” Circulation, 91, pp. 2470–2477. 2. Ruiz, C. E., Zhang, H. P., Butt, A. I., and Whittaker, P., 1997, “Percutaneous Treatment of Abdominal Aortic Aneurysm in a Swine Model: Understanding the Behavior of Aortic Aneurysm Closure Through a Serial Histopathological Analysis,” Circulation, 96, pp. 2438–2448. 3. Villareal, R. O., Howell, M. H., and Krajcer, Z., 2000, “Regression of Inflammatory Abdominal Aortic Aneurysm After Endoluminal Treatment With Bare-Metal Wallstent® Endoprostheses,” Tex Heart Inst. J., 27, pp. 146–149. 4. Chuter, T. A. et al., 2001, “Endoleak After Endovascular Repair of Abdominal Aortic Aneurysm,” J. Vasc. Surg., 34, pp. 98–105. 5. Bell, P. R. F.
, 2002, editorial, “Endovascular Repair of Abdominal Aortic Aneurysms,” Vasc. Med., 7, pp. 253–255.
Cited by
32 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献
|
|