Patent ID: 7160238

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 movable in the catheter by means of pressurized fluid, the catheter comprising: a treating element comprising a hollow cylinder encapsulating a radioactive material; 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 is movable through said first elongated tube from a proximal end of said first elongated tube to a distal end of said first elongated tube for treatment of the selected site in the body and movable back through said first elongated tube to said proximal end of said first elongated tube; 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.