What is the difference between fenestrated & branched endovascular repair?

Fenestrated endovascular repair is when a custom made device based on the patient's CT scan is made in the lab for that particular patient with holes or fenestrations that are specific exact locations and are delivered for that patient to be when there is the anatomy is suitable as such that the distance between the graft and the aortic wall is not far so So you can actually put the graft, go out of the hole, into the branch vessel, and you stent that with a covered stent graft. We use that for a Jexta renal aneurysm, meaning an aneurysm that is close to the renal arteries, but not higher, and we want to extend the repair above that. So that is the most suitable indication for a fenestrated repair in the abdominal aorta. Branched endovascular repair is when we, as the name implies, use branches because there is a distance between the graft and the aortic wall. So if you have, let's say, three, four centimeters on each side of the graft and to go into the a renal artery, then you cannot just put a fenestration and a stengraft. You need a branch to specifically go into those from the graft goes into these branch vessels. So that will bridge the gap between the graft and the aortic branch. This is just a technical difference based on the patient's specific anatomy and the The company will make the adjustments or the recommendation on how to manufacture such a graft based on the patient's CT scan and patient on the input from the treating surgeon what this patient needs. So that's really what the difference between branched and fenestrated repair. which could be extended to what we call thoracobdominal aneurysms, which means involving starting in the chest and going down all the way, as opposed to starting in the abdomen and sparing the chest for fenestrated repair.