A Review of the Evolution of Abdominal Aortic Endografts and Future Directions.

INTRODUCTION: Over the years, endovascular aortic aneurysm repair (EVAR) has become the gold-standard of therapy for abdominal aortic aneurysm (AAA) repairs. This study aims to analyze the evolution of stent graft devices and discuss the future direction of technological development.

MATERIALS AND METHODS: In this paper, we will review prior eras of graft development (1992 to 2019) that included physician-made devices (era one), industry-made devices (era two), branch devices (era three), and fenestrated devices (era four). Additionally, future advancements that aim to overcome issues with short aneurysm necks, involvement of proximal visceral branches, and formation of endoleaks will be discussed.

RESULTS: Future devices of note include a more conformable version of the EXCLUDER® device (W. L. Gore & Associates, Inc., Newark, Delaware) to better steer the top of the graft and modify for angulated necks, a version of the Endurant® device to include EndoAnchors (Medtronic plc, Minneapolis, Minnesota) to prevent formation of endoleaks, a novel Nellix® EVAS II device (Endologix Inc., Irvine, California) with aneurysm sac filling to prevent endoleaks and exclude the aneurysm sac, and an expanded Zenith® fenestrated device (Cook Medical Inc., Bloomington, Indiana) to include more visceral branches. This is in the setting of more recent advancements like pivoting fenestrated branch devices for "off-shelf" use and aneurysm repair that now extends to the thoracic aorta.

CONCLUSION: With each iteration of devices, EVAR has evolved to overcome technical challenges and offer expanded applicability to different types of AAAs.