The Medtronic Stent Graft System is used to repair descending thoracic aortic aneurysm. Use of the device may lead to stent fractures and endoleaks.

http://www.fda.gov/medical-devices/medical-device-recalls/medtronic-recalls-valiant-navion-thoracic-stent-graft-system-due-risk-stent-fractures-and-type-iii