Described embodiments include apparatus that includes acatheter and a tip electrode, at a distal end of the catheter,shaped to define a plurality of fluid apertures. A structure,within the tip electrode, is configured such that fluid passeddistally through a lumen of the catheter flows in alongitudinal direction through a space between the structureand an inner surface of the tip electrode, prior to exitingthrough the fluid apertures. Other embodiments are alsodescribed.
