Gj. Wilson et al., A SELF-EXPANDING BIFURCATED ENDOVASCULAR GRAFT FOR ABDOMINAL AORTIC-ANEURYSM REPAIR - AN INITIAL STUDY IN A CANINE MODEL, ASAIO journal, 42(5), 1996, pp. 386-393
Approximately 50,000 abdominal aortic aneurysms (AAAs) are surgically
repaired annually in the United States. Endovascular grafts (EVGs) com
bine a stent and a vascular graft offering great potential for reduced
morbidity, mortality, and hospital stay because of minimally invasive
endoluminal placement through catheters. Because most AAAs extend int
o one or both iliac arteries, a bifurcated EVG (bEVG) was developed, c
onsisting of a proximal aortic trunk divided into two distinct lumens
or sockets to receive two smaller diameter leg (iliac) components. All
components were composed of Didcott self-expanding braided wire stent
s integrally attached to porous spun polycarbonate urethane liners. Su
ccessful placement of the bEVGs (trunks 10-12 mm and legs 5-6 mm diame
ter) by a 10 Fr introducer through the femoral arteries into the infra
renal aorta and external iliac arteries of 9 of 11 dogs was achieved.
Subsequently, 11 of 12 bEVGs were successfully placed to exclude a sac
cular aneurysm exceeding three aortic diameters created by a fascia la
ta pouch extending from the aorta into the left external iliac artery,
of which 7 were patent at 1 to 4 months. These findings establish des
ign feasibility of the bEVG as well as the utility of the canine exper
imental model.