Abstract: A system including a positioning member (10) including a flexible member (12) which is reversibly deformable between a first deployment configuration and a second deployment configuration, at least one vasculature abutment member (40) located on the flexible member (12) for abutting against structure (17) in a vasculature of a patient, and a delivery system (22) connected to the positioning member (10) for delivering the positioning member (10) to the structure (17) in the vasculature of the patient and for deforming the flexible member (12), wherein in deforming between the deployment configurations, the flexible member (12) undergoes eversion.