Medtronic Recalls Valiant Navion Thoracic Stent Graft System Due to Risk of Stent Fractures and Type III Endoleaks The U.S. Food and Drug Administration has classified the recall of the Medtronic Valiant Navion Thoracic Stent Graft System as a Class I recall. A Class I recall is the most severe type of recall, and it is applied … [Read more...] about Medtronic Valiant Navion Thoracic Stent Graft System Recall