The Solaris DE Sirolimus-Eluting Covered Stent for the Treatment of AV Access Stenosis or Occlusion

This is a prospective, randomized (1:1), controlled, multicenter study to investigate the safety and efficacy of the Solaris DE in the treatment of hemodialysis patients with stenosis or occlusion of the venous outflow circuit. The study population includes three cohorts: * AVF cohort: subjects presenting an arteriovenous fistula (AVF) stenosis or occlusion of the peripheral venous outflow circuit, including the cephalic arch, will be randomized 1:1 between treatment with the test device (Solaris DE) or standard treatment by Percutaneous Transluminal Angioplasty (PTA) alone; * AVG cohort: subjects with an arteriovenous graft (AVG) presenting stenosis or occlusion at the graft vein anastomosis or juxta-anastomosis or at the segment of the prosthesis exit circuit, will be treated with the test device (Solaris DE) only. * AVF/ AVG cohort: subjects with AVF/AVG for hemodialysis who have stenosis or occlusion of the periferic venous outflow circuit (including the cephalic arch and anastomosis of the graft vein or juxta-anastomosis) will be treated with Solaris DE (200).