An apparatus for cleaning a paint roller includes a container having a top with an insertion opening for introducing a paint-carrying surface of the paint roller into the container and a bottom with a discharge opening for discharging paint out of the container. The apparatus further includes a substrate table for holding a substrate, a projection system for projecting the patterned beam onto a target portion of the substrate, and a collector which is arranged for transmitting radiation, received from a first radiation source, to the illumination system. The catheter 2 is open at the distal end for passage of blood through the catheter from the distal end.