An occlusion device for occluding a body vessel is provided. The occlusion device has a tubular expandable body having an interior side and an exterior side. A restricting ring is located around the exterior side of the tubular expandable body and collapses a portion of the tubular expandable body. The occlusion device is configured to move between an expanded state for occlusion within a body vessel and a collapsed state for delivery or retrieval of the device, and the device is configured to open radially to define the expanded state and to collapse along the longitudinal axis to define the collapsed state. A delivery assembly for an occlusion device and a method of constructing an occlusion device are also disclosed.