Drug-Eluting Balloon in Arteriovenous Graft

Inclusion Criteria: 1. Aged 18 to 90 years 2. Patients under hemodialysis via prosthetic arteriovenous graft in the arm 3. Vascular access was created for more than 30 days and used at least one successful session 4. Clinical failure for hemodialysis due to higher venous pressure or lower arterial flow 5. Angiography proved venous anastomotic stenosis ≥50% (the entire lesion of venous anastomotic stenosis will be extended into AVG no more than 2cm and naive vein no more than 7 cm). There was no other obvious stenosis. 6. Reference diameter of venous anastomosis within 7 mm Exclusion Criteria: 1. Patient could not write informed consent 2. Being unwilling or unable to return for follow-up visits or reason to believe that adherence to follow-up visits would be irregular 3. Current or scheduled enrollment in other, conflicting studies. 4. Acute thrombosis in the past 3 months 5. Central venous stenosis 6. Concomitant disease (e.g., terminal cancer) or other medical condition likely to result in death within 6 months 7. A blood coagulation disorder 8. Sepsis or infected arteriovenous access graft 9. A contraindication to the use of contrast medium 10. Pregnancy