A vascular occlusion device for occluding a body cavity includes an elongate member, a deflecting device and an indicator device. The elongate member includes a proximal end and a distal end. An embolization material is injected into the body cavity through the distal end. The deflecting device is disposed at the distal end of the elongate member and configured to be deflected by the embolization material. The indicator device is disposed at the proximal end of the elongate member. The indicator device indicates a status of occlusion of the body cavity based on deflection of the deflecting device by the embolization material.
