Stent grafts used for repairing thoracoabdominal aortic aneurysms (TAAA) are typically designed to mimic the patient's anatomy, but a new device being evaluated in an early feasibility study bucked that tradition and one of the lead investigators told Medical Device Daily that just may make all the difference. TAAAs start at the chest and extend through the abdomen and represent about 15 percent of thoracic aneurysms.