1, pathological changes of severe calcification and eccentric calcification are common causes of failure of vascular reconstruction of lower limbs in normal state, which will make it difficult to pass the guide wire catheter during operation, dissect it, embolize it at the distal end and retract it elastically after operation.
2. Plaque rotomy requires minimally invasive incision and catheter insertion in the artery, which cannot be effectively treated for arteries smaller than 3 mm..
3. Plaque rotary cutting is mainly to cut and remove the hardened plaque in the arterial cavity by rotary cutting catheter, which can not achieve ideal therapeutic effect for chronic thrombosis and plaque.