The purpose of the study is to evaluate the TALENT endoluminal stent-graft system in
patients with abdominal aortic aneurysms. The TALENT endoluminal stent-graft system is a
flexible, implantable endoluminal vascular device preloaded in a placement system that is
used to exclude abdominal aortic aneurysms.
An aneurysm is a localized dilatation of a blood vessel at least 1 1/2 to 2 times the normal
vessel diameter. Abdominal aortic aneurysms are relatively common, and have been detected in
1.3% to 2.7% of patients 65 to 80 years of age (Blum, et al, 1996; Collins, Araujo, and
Lindsell, 1988; Scott, Ashton, and Kay, 1991). A large proportion (up to 50%) of patients
with untreated AAAs experience rupture and exsanguination (Johansen, 1995). Ruptured AAAs
are the 13th leading cause of death in the US, accounting for more than 15,000 deaths per
year (Cronenwett and Sampson, 1995).
Conventional treatment of abdominal aortic aneurysms is by a surgical procedure involving
midline laparotomy, aortic clamping, aortic bypass, and blood loss with associated
transfusion. Improvements in surgical techniques and patient care have allowed the mortality
rate associated with this procedure to be reduced to approximately 5%, when elective repair
is done prior to rupture of the aneurysm. Risks of surgery increase when the patient is
considered to be a poor candidate for surgery.
Due to progress made in interventional radiology and endovascular surgery, it is now
possible to treat aneurysms without an abdominal surgical procedure, thus potentially
further reducing the risks associated with elective repair. This new therapeutic approach
consists of transfemoral introduction of a metallic stent coupled with a vascular graft.
When the stent device is deployed and expanded within the aneurysmal blood vessel, it
creates a new aortic lumen for blood flow, effectively excluding the aneurysm sac from the
flow while maintaining perfusion to the lower limbs. This less invasive technique is
designed to prevent the need for laparotomy, to reduce the need for blood transfusions, to
decrease the use of anesthetics and other drugs, and to speed recovery time.
The objective of this study is to evaluate the safety and effectiveness of the TALENT
endoluminal stent-graft system in patients who may be categorized as standard risk, high
risk or other indications. Standard risk patients are patients with indications for
treatment that are consistent with those for a manufacturer IDE, when there is no active
enrollment in the IDE. High risk patients are patients who do not meet the entrance criteria
for the manufacturer sponsored IDE as they are at high risk of morbidity and mortality with
standard surgical repair. Other indications would be considered patients with indications
for treatment outside of those or the manufacturer sponsored IDE.
This study will be performed in both high risk and low risk patients who are considered good
candidates for endoluminal repair of abdominal aortic aneurysms. Patients should be
heparinized during the implant procedure such that an activated clotting time of 300 seconds
is achieved. During implantation of the TALENT endoluminal stent-graft, the pre-implant CT
scan and available angiograms are used together with (on-the-table) digital subtraction
angiography (DSA), roadmapping, and angiography for proper implant positioning. The TALENT
endoluminal stent-graft endoprosthesis is inserted by delivery catheter and introducer
sheath via a surgical cutdown (e.g., external iliac artery, femoral artery) approach. The
introducer sheath and delivery catheter containing the stent-graft is inserted over a
guidewire and advanced into the aorta and above the aneurysm. With the delivery catheter in
the correct position, the push rod is held stationary while the outer sheath is slowly
withdrawn. The introducer sheath is then withdrawn further until the stent-graft is
completely deployed. The balloon may be inflated along the full length of the implanted
device to model the springs against the vessel wall and to unravel possible wrinkles in the
graft fabric. After deployment of the stent-graft, angiography is performed to verify
implant position and to check for the presence of endoleaks.
Subjects will undergo an evaluation of the TALENT endoluminal stent-graft to determine the
safety and efficacy of the device as indicated by the adverse event rate, and to determine
the risk factors that are most predictive of a successful outcome when used to exclude
abdominal aortic aneurysms that require suprarenal fixation in high risk and low risk
patients. Follow-up will be completed at 1, 6, 12, 24, 36, 48, and 60 months. Subject
evaluation at 1 month will include a complete Physical Examination, Bilateral ABIs, and a
Duplex Ultrasound (if not previously completed at time of discharge). Subject evaluation at
6 months will also include a Complete Physical Examination, Bilateral ABIs, Duplex
Ultrasound, and Abdominal X-ray (AP, Lateral, 2 Obliques). Subject evaluation at 12, 24, 36,
48, and 60 months will include a Complete Physical Examination, Bilateral ABIs, Abdominal
X-ray (AP, Lateral, 2 Obliques), and Spiral CT scan with and without IV Contrast 2.5mm.
- Subject is ≥ 18 years of age.
- Subject has a proximal AAA neck (distance between the top of the aneurysm and the
renal arteries) ≥ 5 mm.
- Subject has a proximal aortic neck diameter ≥ 14 mm and ≤ 32 mm.
- Subject has an angle between the suprarenal aorta and the aneurysm ≤ 60°.
- Subject has renal arteries ≥ 9 cm from the aortic neck bifurcation.
- Subject has proximal and distal iliac neck diameters ≥ 8 mm and ≤ 24 mm.
- Subject has a distal iliac neck length ≥ 15 mm.
- Subject has signed the informed consent.
- Subject will be available for follow-up at periodic intervals after the procedure.
- Subject has a document patent inferior mesenteric artery and an occluded or stenotic
celiac and superior mesenteric artery.
- Subject has a lesion that cannot be crossed with a guide wire.
- Subject whose arterial access site cannot accommodate the delivery catheter.
- Subject has no distal vascular bed.
- Subject has systemic infection, or is suspected of having systemic infection.
- Subject has an untreatable bleeding diathesis.
- Subject is not available or is not willing to come back for periodic follow-up
(surveillance) after the procedure.