WE CLAIM:
1. A balloon ablation catheter (1) comprising:
a shaft (5, 6) in which a lumen penetrates in the longitudinal direction;
a balloon (2) fixed to said shaft, wherein said lumen communicates with the inside of the balloon; and
a high-frequency-current-applying electrode (3) arranged inside said balloon (2), which electrode is formed by coiling a high-frequency-power-supplying lead wire (8) that supplies high-frequency power from power supply devices (7) around said shaft,
a temperature sensor lead wire (9) that supplies a measured signal to the power supply devices is sandwiched between the high-frequency-power- supplying lead wire (8) being coiled and the shaft, and is fixed along the longitudinal direction of the shaft;
wherein a thermocouple thermosensor (4a) is formed at the point where said high-frequency-power-supplying lead wire (8) and said temperature sensor lead wire (9) constituting said high-frequency-current-applying electrode (3) contact with each other for the first time as seen from the posterior end side in the longitudinal direction, and
said temperature sensor lead wire (9) is in contact at a plurality of points with said high-frequency-power-supplying lead wire (8).
2. The balloon ablation catheter according to claim 1, comprising an oscillator that gives oscillation to a heating liquid in said balloon by repeating suction and discharge of the heating liquid from said lumen.
3. The balloon ablation catheter according to claim 1 or 2, wherein said thermocouple temperature sensor (4a) is formed at the posterior end portion of said high-frequency-current-applying electrode (3).
4. The balloon ablation catheter according to any one of claims 1 to 3, wherein said temperature sensor lead wire (9) reaches the anterior end portion of said high-frequency-current-applying electrode (3).
22

5. The balloon ablation catheter according to any one of claims 1 to 4, wherein said
temperature sensor lead wire (9) and said high-frequency-power-supplying lead wire (8) are formed of the different type of metal.
Dated this 28 Day of October 2013
Digitally Signed
( D. Jayaseelan Solomon )
Reg. No: IN/PA-324
of De Penning & De Penning
Agent for the Applicants
23