mutually slidable outer cylindrical shaft (2) and the catheter shaft formed by the inner tube shaft (3) (1), the distal end portion of the outer cylindrical shaft (2) (4) and the inner cylindrical shaft (3 tip of) (5) and a shrinkage expandable balloon (6) that is disposed between the neighborhood, between the outer cylindrical shaft (2) and the inner cylindrical shaft (3) within the balloon (6) the liquid feeding passage (9) is formed leading to, the handle portion (11) front tank (12) and the rear tank connected via a connecting pipe (15) (13) are disposed respectively before and after the tank (12 , 13) and a possible slide to each other and the cylindrical shaft (3) of which passes through the center of the front and rear and the inner cylindrical shaft (3) tank (12, 13) and for preventing fluid leakage in the slide portion of the placed a packing stopcock (22, 32) is, around the tank (12, 13) leads into the interior of the balloon (6) through a liquid feeding passage (9), in front of the rear tank (13) piston (27) is built, having a structure in which the internal pressure of the front and rear of the tank (12, 13) varies with longitudinal movement of the tubular shaft inner fixed to the central portion (3), the inner cylindrical shaft (3) forward When extruded into, together with the balloon (6) is stretched, the balloon (6) is the rear tank (13) becomes negative pressure while contracting, when the inner cylindrical shaft (3) pulled back rearward, the balloon ( together with the stretch is released in 6), the balloon (6 becomes positive pressure rear tank (13)) is a balloon catheter system that is configured to be extended.互いにスライド可能な外筒シャフト(2)と内筒シャフト(3)とにより構成されるカテーテルシャフト(1)と、外筒シャフト(2)の先端部(4)と内筒シャフト(3)の先端部(5)近傍との間に設置される収縮拡張可能なバルーン(6)とを備え、外筒シャフト(2)と内筒シャフト(3)との間にはバルーン(6)内に通じる送液路(9)が形成され、ハンドル部(11)には連結管(15)を介してつながる前部タンク(12)と後部タンク(13)がそれぞれ設置され、前後のタンク(12,13)とその中心部を通過する内筒シャフト(3)とは互いにスライド可能であり、内筒シャフト(3)と前後のタンク(12,13)とのスライド部には液漏れ防止用のパッキングとなる活栓(22,32)が設置され、前後のタンク(12,13)は
