The application relates to medical devices and systems for preventing the embolic material flowing about a junction of at least one branch blood vessel and another blood vessel from entering the other blood vessel. The device includes a self cleaning flexible filter (100) and a frame (180). The external surface of the filter (152) is configured to temporarily trap at least some of the embolic material flowing about the junction as a result of the blood inflow though the filter. The filter is also configured to expel the trapped embolic material into the other blood vessel.
