The present invention relates to catheters in general and more particularly to improvements in so-called "irrigated ablation catheter" that may be used in mapping and ablation procedures of tissue, preferably heart tissue in the treatment of cardiac arrhythmia. The present invention is directed irrigated ablation catheter comprising an elongated catheter shaft (4), a deflectable section (3) distal to the catheter shaft, an ablation catheter tip (1) distal to the deflectable section. The ablation catheter tip comprises an irrigation fluid flow distributor (10) and a cap(20) having a cylindrical side part and a tip, the flow distributor (10) has a distal end (16) and a proximal end (15) an inner channel (11) and an outer channel (12), whereby the distal end of the inner channel is coupled to the distal end of the outer channel, characterized in that the outer channel (12) has a helical shape in form of a double helix and is defined by the cylindrical part of the cap (20) and the irrigation fluid flow distributor (10), whereby the cylindrical part of the cap (20) is tightly slid over the irrigation fluid flow distributor (10) and seals the outer channel of the flow distributor thus forming two helical cavities； whereby irrigation fluid exit ports (21) are arranged on the cylindrical part of cap (20), said exit ports being arranged such that they follow the spiral course of the outer channel and whereby the cap has further irrigation fluid exit ports (23) which are arranged on the tip of the cap.La présente invention concerne en général des cathéters, et plus particulièrement des améliorations de ce qu'on appelle "cathéter d'ablation irrigué" qui peut être utilisé dans des interventions de cartographie et d'ablation de tissu, de préférence un tissu cardiaque pour le traitement d'arythmie cardiaque. La présente invention concerne un cathéter d'ablation irrigué comprenant une tige de cathéter allongée (4), une section pouvant être déviée (3) distale par rapport à la tige
