Biopolymers for endovascular use

This article reviews the current status of polymeric graft materials used i n stent grafts. The chemical structure, physical properties, and biological properties of polyethylene terephthalate (PET), polytetrafluoroethylene (P ET), and polyurethane (PU) are described. Each polymer has specific advanta ges and disadvantages. Polymer thrombogenicity, porosity, tensile strength, and durability impact on endovascular applications. PTFE appears most suit able to small diameter grafts, while PET materials are used for large (>10 mm diameter) grafts. Endovascular grafts composed of PU are not currently a vailable. The use of currently available polymeric graft materials for endo vascular procedures requires careful matching of polymer properties with cl inical applications.