Vascular grafts are medical devices used to replace or repair damaged blood vessels. These grafts can be made from synthetic materials, such as polytetrafluoroethylene (PTFE) or Dacron, or from biological tissues, such as veins or arteries harvested from the patient or a donor. In pediatric patients, vascular grafts are used to address congenital or acquired vascular anomalies that cannot be corrected by other means.