A medical implantable occlusion device (100, 200) is disclosed comprising a fabric of at least one thread (101) and a structural formation (102) thereof having a collapsed and an expanded shape, the formation comprises a proximal and a distal portion (103, 104), a longitudinal axis (105) extending between the proximal and distal portion, wherein at least one of the proximal and distal portions comprises a peripheral edge (107, 108) having a first (109, 109') and a second (110, 110') radius of curvature in a direction substantially perpendicular to the longitudinal axis, wherein the first radius of curvature is different from the second radius of curvature.
