A prospective, multi-centre, objective performance criteria clinical trial to evaluate the safety and efficacy of Abdominal Aortic Aneurysm Stent Graft System manufactured by Lifetech Scientific (Shenzhen) Co., LTD. for the infrarenal abdominal aortic aneurysm.

This clinical trial was conducted in a qualified clinical trial institution. Investigators will use Abdominal Aortic Aneurysm Stent Graft System manufactured by Lifetech Scientific (Shenzhen) Co., LTD. to treat patients with Infrarenal Abdominal Aortic Aneurysm. This is a Prospective, Multi-center, Objective Performance Criteria Clinical Trial. It is expected to submit to the ethics committee of the lead unit for review in March 2018, and complete the implantation of 156 patients in 22 centres nationwide within 12 months, and interim follow-up was conducted before discharge, 30 days after surgery, 6 months after surgery and 12 months after surgery, long-term follow-up will be performed at 24 months postoperatively, 36 months postoperatively, 48 months postoperatively and 60 months postoperatively.

This trial will evaluate whether the device reached the primary safety endpoint and primary efficacy endpoint through two primary endpoint indicators: the incidence of major adverse events (MAE) within 30 days and the success rate of abdominal aortic aneurysm treatment 12 months after surgery. This trail will evaluate whether the device reached the secondary safety endpoint and primary efficacy endpoint through several secondary endpoint indicators: Perioperative (intraoperative to postoperative 30 days) delivery related complications incidence rate (including the transabdominal surgery caused by intraoperative conveyors, the hemorrhage in the middle iliac artery, the hemorrhage in the femoral artery at the puncture site, the hematoma and the pseudoaneurysm), the incidence of acute lower limb ischemia before discharge and 30 days after surgery, all-cause mortality at 6 months, 12 months and 2-5 years after surgery, abdominal aortic aneurysm-related mortality at 6 months, 12 months and 2-5 years after surgery, the incidence of severe adverse events (SAE) at 6 months, 12 months and 2-5 years after surgery, the incidence of the device-related adverse events (AE) at 6 months, 12 months and 2-5 years after surgery, the incidence of type I or type III leakage at 6 months, 12 months after surgery, the incidence of displacement of Abdominal Aortic Aneurysm Stent at 6 months, 12 months after surgery and the incidence of conversion from abdominal aortic aneurysm treatment to open surgery or secondary surgery intervention at 6 months, 12 months and 2-5 years after surgery. According to the guidelines for clinical trials of aortic stent system, the sponsor will apply for CFDA listing registration after completing a 12-month primary endpoint assessment. According to the guidelines for clinical trials of aortic covered stent system, the sponsor will apply for CFDA listing registration after completing a 12-month primary endpoint assessment, and annually follow-up will be conducted until the fifth year for the long-term efficacy observation.

Inclusion Criteria:

• 1. Patients aged greater than 18 years old and less than 85 years old, regardless of gender.

  2. Patients who can understand the purpose of the trial, voluntarily participate in and sign the informed consent, and are willing to complete the follow-up according to the requirements of the protocol.

  3. Patients diagnosed with Infrarenal Abdominal Aortic Aneurysm and should meet at least one of the following conditions:

  1. The maximum diameter of abdominal aortic aneurysm ≥50mm in male patients, or the maximum diameter of abdominal aortic aneurysm ≥45mm in female patients.

  2. The maximum diameter of abdominal aortic aneurysm ≥40mm and the diameter increased by more than 5mm in the last 6 months (In this case, the diameter data of abdominal aortic aneurysm should be traceable within 6 months).

  3. The abdominal aortic aneurysm compresses vital organs and causes symptoms (such as abdominal pain, lower back pain, etc.) 4. The range of proximal aneurysm neck diameter of the abdominal aortic aneurysm is between 17mm to 32mm.

     5. The length of the proximal aneurysm neck of abdominal aortic aneurysm≥10mm, and the angle of the proximal aneurysm neck ≤75 °.

     6. The range of the diameter of the iliac artery anchoring area is between 8mm to 22mm.

     7.The length of the iliac artery anchoring area≥15mm.

     8. The patient has a suitable iliac and femoral artery approach.

     Exclusion Criteria:

• 1. Patients with severe stenosis, calcification, or mural thrombus in the anchoring area of the stent and easily lead to incomplete stent apposition.

  2. Patients with rupture of an abdominal aortic aneurysm or threatened rupture.

  3. Patients with abdominal aortic dissection.

  4. Patients with mycotic or infectious abdominal aortic aneurysms.

  5. Patients with a history of myocardial infarction or unstable angina pectoris for 6 months. Characteristics of unstable angina pectoris: angina symptoms gradually increased, new onset of rest or night angina pectoris or occurrence of angina prolonged.

  6. Patients with any transient ischemic attack (TIA) or ischemic stroke within 3 months.

  7. Patients with a history of allergy to contrast media, stents and conveyor materials (including nickel and titanium, polyester, PTFE, and nylon polymer materials).

  8. A patient with connective tissue diseases such as Marfan syndrome, Eaton syndrome, or Bessel's disease.

  9. Patients with liver dysfunction: Alanine transaminase (ALT) or Aspartate transaminase (AST) were five times higher than the normal upper limit；serum total bilirubin (STB) was two times higher than the normal upper limit.

  10. Patients with renal dysfunction: Serum creatinine (Cr) was two times higher than the normal upper limit.

  11. Life expectancy is less than one year.

  12. Patients with major organ failure or other serious diseases;

  13. Patients who were not suitable for endovascular treatment, judged by the investigator.

  14. Pregnant or lactating women or women who plan to get pregnant.

  15. The patients participated in other clinical trials and did not come out of the group or withdraw within the first 3 months of the screening period of this trial.