**Study Summary**: This study is about checking how safe and effective a special balloon catheter is for treating blockages in the blood vessels used for dialysis, called an *Arteriovenous Fistula (AVF)*. A catheter is a thin, flexible tube that's put inside the body to help with medical procedures. The special balloon catheter used in this study is coated with medicine to help keep the blood vessels open.
Patients can join if they are 18 to 85 years old, have already had successful dialysis, and have certain types of blockages in their AVF. People cannot join if they have more than one blockage or certain medical conditions, like infections or being pregnant.
**Key Points**:
- The study involves using a drug-coated balloon to treat blockages in dialysis fistulas.
- Participants must have had a successful dialysis and meet specific health requirements.
- Certain conditions, like pregnancy or infections, make people ineligible to join the study.
*Note*: Participants need to provide written consent and cannot be part of another study at the same time.
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