This study is a prospective, multi-center, randomized controlled study, which evaluates the effectiveness and safety of cold laser plaque ablation for lower limb arterial stenosis and occlusive lesions from intermittent claudication to chronic threatening limb ischemia.

This study is a prospective, multi-center, randomized controlled study. This study will be conducted at four centers and is expected to enroll 110 patients. And we will evaluate the effectiveness and safety of cold laser plaque ablation compared to excimer laser system for lower limb arterial stenosis and occlusive lesions.

Inclusion Criteria:

General selection criteria

1. Age between 18 and 85, gender is not limited;
2. Patients with symptomatic lower extremity arteriosclerosis disease (LEAD), Rutherford grade 2 to 5;
3. The stenosis of lower extremity arteries is greater than 70% or occlusion;
4. The subject is able and willing to comply with all requirements, including 6-month follow-up and evaluation, voluntary participation and informed consent.

Intraoperative contrast inclusion criteria

1. The internal diameter of the reference vessel proximal to the target lesion is greater than 1.8mm;
2. The stenosis of target lesion is greater than 70%;

Exclusion Criteria:

1. The target lesion is located in the artificial vascular or autologous venous vascular bypass;
2. Endovascular or surgical procedure in the target limb performed less than or equal to 30 days prior to the index procedure OR Planned endovascular or surgical procedure 30 days after the index procedure;
3. Intent to use other atherectomy device in the same procedure;
4. Flow-limiting dissection within, proximal or distal to the target lesion;
5. Evidence or history of aneurysm in the target vessel， intracranial or gastrointestinal bleeding, intracranial aneurysm, myocardial infarction or stroke within the past 2 months;
6. Uncorrected coagulation abnormalities (platelet count ≤ 75*109/ L or INR≥2.0), bleeding constitution, and history of heparin-induced thrombocytopenia (HIT);
7. Any thrombolytic therapy was performed within 2 weeks before surgery;
8. History of severe trauma, fracture, major surgery, or parenchymal organ biopsy within 2 weeks before surgery;
9. Known allergy to contrast agents or perioperative drugs;
10. Anticoagulation, antiplatelet or thrombolytic therapy is prohibited;
11. Pregnant or lactating women;
12. Subjects participating in other clinical trials of drugs or medical devices;
13. Other circumstances assessed by the investigator as inappropriate to participate in the trial.