The GORE® VIABAHN® FORTEGRA Venous Stent IVC Study

Preoperative Inclusion Criteria: * Patient is at least 18 years of age. * Patient is willing and able to comply with all follow-up evaluations as well as any required medication or compression regimen. * Patient is able to provide informed consent. * One of the following: Clinical severity class of CEAP 'C' classification ≥3 or rVCSS pain score ≥2. * Intention to treat the target areas with only the GORE® VIAFORT Vascular Stent. * Estimated life expectancy ≥1 year. * Patient is ambulatory (use of assistive walking device such as a cane or walker is acceptable). * Patient has adequate inflow to the target lesion(s), per investigator/sub-investigator discretion, involving at least a patent femoral or deep femoral vein. Preoperative Exclusion Criteria: * Patient is a pregnant or breastfeeding woman, a woman planning to become pregnant through the 12-month visit, or a woman who is unwilling to practice an acceptable method of preventing pregnancy through the 12-month visit. * Patient has clinically significant (e.g., symptoms of chest pain, hemoptysis, dyspnea, hypoxia, etc.) pulmonary embolism (confirmed via Computed Tomography Angiography) at the time of enrollment. * Patient has a known uncorrectable bleeding diathesis or active coagulopathy meeting the following definitions: uncorrected INR\>2 (not as a result of warfarin or DOAC therapy), OR platelet count \<50,000 or \>1,000,000 cells/mm3, OR white blood cell count \<3,000 or \>12,500 cells/mm3. * Patient has impaired re…