According to the invention, a fluid exchange catheter is provided, which catheter has a proximal end and a distal end, and comprises an obligatory lumen having a proximal end and a distal end, the distal end of the obligatory lumen having a closed shape, wherein a lumen wall of the obligatory lumen forms a distal wall portion at the distal end of the obligatory lumen, the distal wall portion comprising at least one lumen opening in the lumen wall. Furthermore, the catheter comprises at least one additional lumen having a proximal end and a distal end, the distal end being arranged inside the obligatory lumen remote from the distal end of the obligatory lumen such that fluid exiting the at least one additional lumen flows inside the distal end of the obligatory lumen. Here, the distal wall portion exhibits expansibility in at least an area surrounding the at least one lumen opening in order to provide an unblocking function for removing blockage of the catheter.
