The WRAP Study aims to expand and understand the safety and efficacy data on the WRAPSODY Endoprosthesis System in a real-world population.

Prospective, multicenter, observational study to evaluate the Merit WRAPSODY™ Endoprosthesis for treatment of stenosis or occlusion within the dialysis outflow circuit of an arteriovenous (AV) fistula or AV graft (The WRAP Registry)

Inclusion Criteria:

1. Subject provides written informed consent for study participation.
2. Subject is male or female, with an age ≥ 18 years at date of enrollment.
3. Subject is willing to comply with site standard of care procedures and follow-up visit schedules over 24 months.
4. Subject is undergoing chronic hemodialysis with the hemodialysis access the intervention will be performed upon
5. The dialysis access is considered mature and has been used to deliver hemodialysis treatments for at least one session.
6. Subject has stenosis or occlusion within the dialysis outflow circuit of an arteriovenous (AV) fistula or AV graft and is treated with WRAPSODY Endoprosthesis System in accordance with device instructions for use.

Exclusion Criteria:

1. Subject has a planned surgical revision of access site.
2. Subject has a known or suspected infection of the hemodialysis access site, systemic infection and/or septicemia.
3. Subject has an uncorrectable coagulation disorder.
4. Known hypersensitivity to nickel titanium alloy.
5. Subject's hemodialysis access is anticipated to be abandoned within 6 months.
6. Subject is scheduled for kidney transplant or peritoneal dialysis within the next 6 months post-procedure.
7. Full expansion of a Percutaneous Transluminal Angioplasty (PTA) balloon cannot be achieved during predilatation.
8. Device would be placed in the Superior Vena Cava
9. Any inflow or outflow lesion that could jeopardize patency access long-term beyond the target treatment area.

The registry will include peripheral cases in both AV graft and AV fistula patients (including at the graft vein anastomosis of an AVG patient) and thoracic central patients in both AV graft and AV fistula patients.