#$%^&*AU2014203211B220160225.pdf#####Abstract The invention relates to a device for treating a medical fluid, said device comprising a treatment machine with a coupling surface, to which a cassette consisting of a hard 5 part with fluid-conducting channels that are covered by a flexible film can be coupled. The invention also relates to a corresponding medical cassette. According to the invention, to guarantee that the film of the cassette can be coupled to the treatment machine without the inclusion of air, air can be sucked off along the plane lying between the flexible film and the coupling surface during the coupling process and/or 10 when the cassette is coupled to the machine. The invention also relates to a method for coupling the cassette and to a method for checking the leak-tightness of the cassette by means of the regulation of the air removal by suction.
