Patent ID: 6994665

Claim:
A catheter for use in a system for intraluminal treatment of a selected site in a body of a patient by at least one treating element which is movable in the catheter by means of pressurized fluid, the catheter comprising: a first elongated tube having a lumen closed to outside said catheter at its distal end and sized to slidingly receive the treating element; wherein said treating element comprising a hollow cylinder encapsulating a radioactive material; and a second elongated tube in parallel relation to the first elongated tube and having a lumen open at its distal end and sized to receive a guidewire; and a third elongated tube for receiving the first and second elongated tubes and defining a space between the third tube and the first and second tubes, the space comprising a fluid return lumen in fluid communication with an opening in the lumen of the first elongated tube at the distal end of said first elongated tube, said space not opening to outside said catheter at the distal end thereof, wherein said third elongated tube is closed at the distal end.