Figure 1: Polymeric Vascular Grafts. Polymeric grafts can be separated into two categories: permanent and biodegradable. Permanent polymeric grafts are made of ePTFE and Dacron, and serve well in large diameter applications [7]. However, they often encounter problems in small diameter vessels, often attributed to mechanical mismatch [12]. Biodegradable polymers serve initially as a mechanical support, but eventually degrade and are replaced with native tissue. Difficulties often arise when attempting to tune degradation kinetics, mechanical properties, and balancing degradation products [31,98].