An exemplary basket catheter includes an outer tubing housing an inner fluid delivery tubing having at least one fluid delivery port. A plurality of splines are each connected at a proximal end of the splines to the outer tubing and at a distal end of the splines to the inner fluid delivery tubing. The inner fluid delivery tubing is operable to be moved in a first direction to expand the splines; and in a second direction to collapse the splines. A porous membrane is provided over at least a portion of the inner fluid delivery tubing. A seat is provided at a proximal end of the porous membrane between the porous membrane and the outer tubing and between the porous membrane and the inner fluid delivery tubing, the seal configured for irrigating between the plurality of splines of the basket catheter while preventing fluid ingress into the outer tubing.