A catheter system includes: an ablation catheter having an irrigation mechanism； a power source configured to provide the ablation catheter with power used upon ablation； a liquid supplying section configured to provide the ablation catheter with liquid for irrigation； and a control section. The control section so controls the irrigation operation that a large flow rate operation of the liquid is achieved upon a high power state where measured power at the time of the ablation is equal to or greater than threshold power, whereas it so controls the irrigation operation that a small flow rate operation is achieved upon a low power state where the measured power is less than the threshold power. The control section promptly performs switching from the small flow rate operation to the large flow rate operation when making the transition from the low power state to the high power state. When making the transition from the high power state to the low power state, the control section performs, upon continuation of the low power state for a first waiting time in that transition, switching from the large flow rate operation to the small flow rate operation after maintaining the large flow rate operation for the first waiting time.本發明提供一種可進行適當之灌注動作的導管系統。該導管系統5具備具有灌注機構的消融導管1、對消融導管1供應消融時之電力的電源部32、對消融導管供應灌注用液體的液體供給部21、及控制部35。控制部35在消融時的實測電力Pm為閾值電力Pth以上的高電力狀態時，控制成為大流量動作；另一方面，在實測電力Pm為未達閾值電力Pth的低電力狀態時，控制成為小流量動作。另外，在從低電力狀態轉換至高電力狀態時，從小流量動作快速地切換至大流量動作；另一方面，在從高電力狀態轉換至低電力狀態時，於該轉換時在低電力狀態持續了第1等待時間之情形下，將大流量動作在已維持第1等待時間之後切換至小流量動作。
