A team of physicians at Nationwide Children's Hospital have developed a process to improve the acceptance of implanted vascular grafts. This Tissue Engineered Vascular Graft (TEVG) is patient-specific. It seeds patient cells onto a biodegradable tubilar scaffold, which is designed to dissolve with hydrolysis so that only the growing vessel remains. This system, the Closed Seeding System, combines patient imaging data, 3D-printing capabilities, and efficient collection and subsequent seeding of patient cells onto the TEVG scaffolding.