An elastic cap for covering the distal end of a catheter having inner and outer hoses, characterized in that the cap consists essentially of an elastic material, has a cavity in which the distal end of the inner and the outer hose of a catheter can be received, and the cap has a first opening via which the cavity is accessible from the outside, wherein prior to receiving the distal end of the catheter, the first opening has a diameter which is not larger than the outer diameter of the inner hose of the catheter and wherein the first opening is elastically expandable to a diameter which corresponds to the outer diameter of the outer hose.
