Mechanical properties of stent–graft materials

Abstract

An aneurysm is a localized blood-filled dilatation of an artery whose consequences can be deadly. One of its current treatments is endovascular aneurysm repair (EVAR), a minimally invasive procedure in which an endoprosthesis, called a stentgraft, is placed transluminally to prevent wall rupture. 2Early stent-grafts were custom designed for the patient through the assembling of off-the-shelf components by the operating surgeon. However, nowadays, stentgrafts have become a commercial product. The existing endoprostheses differ in several aspects, such as shape design and materials, but they have in common a metallic scaffold with a polymeric covering membrane. This paper aims to gather relevant information for those who wish to understand the principles of stent-grafts and even to develop new devices. Hence, a stent-graft classification based on different characteristics is presented, and the significant features of an ideal device are pointed out. Additionally, the materials currently in use to fabricate this type of prosthesis are reviewed and new materials are suggested.

Type B intramural hematoma: thoracic endovascular aortic repair (TEVAR) or conservative approach?

“…Extended repair also increases the risks of stroke, spinal cord ischemia and type 3 endoleak at the intermodular junctions (24,25). Finally, current stent-grafts for TEVAR are 50-200 times stiffer than healthy aortic tissue (26,27). This increased stiffness of the aorta following stent-graft deployment can increase stresses in the untreated segments of the aortic wall (28).…”

The Structure and Function of Endovascular Stents: A Primer for the Interventional Nephrologist

“…Polyethylene Terephthalate (PET) (31,32,34) Polyethylene Terephthalate, better known as Dacron Ò , is a textile fabric that belongs to the polyester family. The material has been used because of its low cost, high strength, durability, and biocompatibility.…”

“…Expanded Polytetrafluoroethylene (ePTFE) (31,32,34) Derived from Teflon Ò (Dupont Ô , Wilmington, DE) by stretching, ePTFE has a node-fibril microstructure. Large amount of air within the substance gives it a white color.…”

Computational modeling of degradation process on the mechanical performance of Poly-lactic acid /Magnesium composite

“…suggested new materials for stent-graft materials and estimated the mechanical properties of these stents. 36…”