It’s a basic principle of flow physics that if you have a series of holes of equal size in a tube, the closer a hole is to the suction source, the greater the action of the suction at that point. Usage graduated hole sizes – as in Ulmer drain – equalizing suction effect along its entire length and thus increasing drain effectiveness.
Over twice as effective as conventional drains
Clinical studies have shown that Ulmer drains removed over 50% more fluid during the first post-operative day than conventional Redon drain. On days two and three, the Ulmer principle proved to be almost 2.5 times more effective than Redon drain at the distal end. The round holes and uniformly gentle suction help reduce blockage by tissue and subsequent trauma during drain removal.