Cook Venous Valve System for Treatment of Chronic Venous Insufficiency

Limited inclusion criteria: * Documented symptomatic deep venous reflux in one limb * Deep venous reflux in the region of interest Limited exclusion criteria: General: * Age \< 18 years * BMI ≥ 40 * Cultural objections to porcine materials * Unwillingness or inability to comply with the follow-up * Unwillingness to provide study data for duration of study * Simultaneous participation in another device or drug study * Inability or refusal to give informed consent Medical: * Pregnant, or planning to become pregnant * Diagnosis of terminal illness with life expectancy less than 12 months * Complete symptom resolution with compliant compression therapy for three months * Untreated superficial venous disease * Medical interventions including any of the following: planned procedure of any leg, vascular intervention or major surgery within the last three months, implanted inferior vena cava filter * Medical history of any of the following: anticoagulation treatment for pulmonary embolism (within the last six months or ongoing), insulin dependent diabetes, chronic obstructive pulmonary disease, renal dysfunction requiring dialysis, leg amputation, bleeding diathesis, untreated or unresolved systemic infection or local infection, active malignancy except non-melanoma skin cancer, other acute or chronic medical condition that may cause noncompliance with the protocol or confound the study results, documented history of significant untreated stenosis within the arterial system * Positive coronavirus (COVID-19) test six days prior to implant procedure Anatomical: * Inability to clearly visualize target implantation site * Tortuous target implantation site * Inadequate inflow and/or outflow to the target region Procedural: * Inability to gain access to the access site vein * Untreated focal or diffuse stenosis