A vascular occlusion device for occluding a body cavity includes an elongate member for injecting embolization material into the body cavity and a deflecting device. The deflecting device is disposed around a distal end of the elongate member and is expandable to contact an interior wall of the body cavity in the expanded state. The deflecting device is configured to be deflected by the embolization material to change a shape of the deflecting device in the expanded state. The deflecting device provides a visual and tactile indication of completion of embolization based on the shape of the deflecting device in the expanded state.
