A catheter (20) comprising a housing portion defining an interior cavity and the housing portion comprising a housing member (40) having an interior space dimensioned for housing an indwelling medical device (42). The elongated member comprises a lumen extending at least from an exit port (34) to a distal port, the housing member is disposed within the lumen, and the lumen is dimensioned in the housing portion to receive a guidewire outside of the interior space of the housing member. A medical device (42) or filtering emboli from blood flowing in a blood vessel of patient comprising an elongate support member and an elongate side branch member connected to the elongate support member (44). The filter element is attached to the elongate side branch member by a proximal filter element slider, and the elongate side branch member is adapted to maintain the filter element centered in the vessel.
