The biggest challenge in the treatment of diabetic foot is how to reconstruct the blood flow. The vascular lesions of diabetic patients are different from those of non-diabetic patients, and are not ordinary atherosclerosis, as shown by the following: 1. The peripheral vascular lesions of diabetic patients appear early and develop rapidly. 2. Diabetic atherosclerosis can involve the infrapopliteal vessels at an early stage, directly affecting the blood supply of the foot. 3. Long segments of occlusive lesions, rather than short segments of stenotic lesions, often appear. Because of these characteristics, the foot ischemia in diabetic patients is more serious and difficult to treat, thus keeping the amputation rate of diabetic foot high. If there is no way to quickly revascularize and improve the blood circulation in the foot, it is difficult to relieve the disease and the amputation rate will not be reduced. Traditional vascular bypass surgery has certain effects, but there are also many defects: 1, the incision itself has some damage to the limb’s collateral circulation, if the bridge is blocked, the consequences are very serious, because the valuable collateral is gone, the blood supply is even worse, so we often see such cases: ischemia – bypass –So we often see such cases: ischemia – bridge blocked – cut open to remove the embolus – blocked again – amputation. 2, diabetic vascular disease mainly involves small and medium-sized vessels, bypass surgery often belongs to the scope of “small vessel bypass”, the blood vessel itself is very thin, and the outflow channel is not good, so the long-term usually rate is not high, and the rate of restenosis or reobstruction is very high. Diabetic patients are in poor physical condition, and most of them have other medical comorbidities such as heart disease, hypertension, cerebrovascular disease, renal insufficiency, etc., so their ability to tolerate surgery is poor. For these reasons, vascular surgeons have been looking for a relatively minimally invasive method to treat diabetic vascular disease with minimal collateral damage. From around 2001, some doctors in Europe (mainly in Italy) and the United States began to apply interventional therapy to diabetic limb vasculopathy, and this method began to be carried out in some medical units in China around 2005, and now some experience has been gained. The benefits of interventional treatment are: 1. It is less invasive and does not require incision and major anesthesia, which is less devastating to patients. 2, The treatment is carried out in the lumen of the original lesion, and the collateral circulation is not destroyed as much as possible. 3.It can be repeated. Because of the small trauma, it greatly increases the possibility of surgery for patients, and some patients with very weak constitution and advanced age can also tolerate it; because there is less damage to the collateral branches, so even if reobstruction occurs, it is usually not worse than before treatment, and there is a chance of treatment again after reobstruction. Although this method is good, it has some defects: 1. The cost of interventional treatment is high, especially under the current medical reimbursement system in China, and patients need to bear some economic pressure, generally it takes about 10,000 yuan to open a sub-knee vessel. 2, technically difficult, requiring skilled vascular surgery foundation and interventional techniques.