A catheter comprising: a shaft (1) having a proximal end (2) and a distal end (3), the distal end terminating in a tip (4)； a drainage opening (7) located at the distal end of the shaft, the drainage opening communicating with a drainage lumen (8) of the shaft； a balloon located at the distal end of the shaft, the balloon comprising a first region secured to the shaft, a second region secured to the shaft and an elastic-walled conduit extending between the first region and the second region, the elastic conduit extending over the tip.
