The Merit WRAPSODY™ Endovascular Stent Graft

Inclusion Criteria: 1. Subject has signed informed consent 2. Subject is ≥ 21 years of age 3. Subject is undergoing chronic hemodialysis or other forms of renal replacement therapy including transplantation and has one of the following being used: a. AV graft placed in the arm ≥30 days prior OR b. Mature fistula in the arm with at least one successful dialysis session completed 4. Angiographic evidence of stenosis 5. The target lesion has ≥ 50% stenosis 6. Subject has clinical or hemodynamic evidence of a venous outflow stenosis or obstruction 7. Full expansion of an appropriately sized standard angioplasty balloon has been achieved during primary angioplasty at the target lesion prior to enrollment Exclusion Criteria: 1. Subject has undergone an intervention (surgical or percutaneous) of the AVF/AVG \<30 days from the date of the initial study procedure 2. Subject has had a previous stent or stent graft placed in the venous outflow circuit ≤30 days from the date of the initial study procedure 3. Active hemodialysis access is not in the arm 4. A pseudoaneurysm is present within the target lesion 5. Target lesion is in SVC, IJV, under the clavicle, across the elbow, in the needling segment of AVF or AVG anastomosis, located within a stent 6. Lesions, other than the target lesion, in the venous outflow circuit with \>30% stenosis 7. Known or suspected infection of the hemodialysis access site and/or septicemia 8. Permanent pacemaker or automated implantable cardioverter defibrillator (AICD) on the side with the target lesion 9. Current central venous catheter for dialysis access 10. Uncorrectable coagulation disorders 11. Hypersensitivity to nickel titanium alloy 12. The subject is enrolled in another investigational study 13. The subject is unable or unwilling to comply with the protocol requirements 14. Life expectancy is ≤ 12 months 15. Subject cannot receive heparin or equivalent anticoagulant 16. Allergy to radiographic contrast material which cannot be adequately premedicated 17. Subject is pregnant, breastfeeding, or pre-menopausal and intending to become pregnant 18. Subject's access is anticipated to be abandoned within 3 months 19. Subject has a thoracic central vein obstruction that would lead to stent graft placement across the internal jugular vein 20. Subject's hemodialysis access is thrombosed 21. Active malignancy other than non-melanomatous skin cancer 22. Any other condition deemed exclusionary in the opinion of the investigator