A urinary catheter includes a tube and a tip. The tube has a tube wall defining a lumen extending between a distal tube end and a proximal tube end, with an opening formed in the tube wall. The tip extends from the proximal tube end to a closed proximal tip end. An inside diameter of the lumen increases constantly along an entire length of the tube from a first inside diameter measured at the proximal tube end to a second inside diameter measured at the distal tube end, where the first inside diameter is smaller than the second inside diameter such that the lumen is formed in a conical shape that diverges from the proximal tube end to a wider cross-sectional opening at the distal tube end.