Long-term atherosclerosis and diabetes can cause arterial stenosis and thrombosis in different parts of the body. When vascular lesions occur in the lower extremities, they can cause cool numbness, resting pain, walking weakness, intermittent claudication, black toe ulceration and other symptoms, and in severe cases, amputation is required, and inappropriate treatment can even lead to death. Interventional surgery is a method to treat diseased blood vessels: first, the site, degree and characteristics of the vascular lesion are clarified by imaging, and then the occluded blood vessel is opened with the use of catheter guidewire and other techniques, and then the narrowed blood vessel is restored to its normal diameter with the use of balloon catheter, so that the blood supply to the limb is restored, and if necessary, an internal stent is placed in the diseased blood vessel, together with anticoagulation and anti-infection treatment, to achieve the purpose of treatment. Interventional therapy is also suitable for lesions with venous stenosis and thrombosis.