Device and method for treating a medical fluid and medical cassette

A medical cassette made of a hard part having liquid-conducting passages which are covered by a flexible film, with the cassette being able to be coupled to the coupling surface of a treatment machine,

• the medical cassette comprising at least one suction opening arranged in the hard part of the cassette.

A treatment machine for treating a medical liquid. having a coupling surface and a flexible mat, in particular a silicone mat, arranged on the coupling surface, with a cassette made of a hard part haying liquid-conducting passages which are covered by a flexible film being able to be coupled to the coupling surface of the treatment machine via the flexible mat, the treatment machine comprising at least one suction device,

• characterized in that,
• suction of air between the flexible mat of the treatment machine and the flexible film of the medical cassette takes place via one ore more suction openings arranged in the hard part of the cassette.

An apparatus comprising:

• a treatment machine for treating a medical liquid haying a coupling surface and a flexible mat, in particular a silicone mat, arranged on the coupling surface, with a cassette made of a hard part having liquid-conducting passages which are covered by a flexible film belie able to be coupled to the coupling surface of the treatment machine via the flexible mat, the treatment machine comprising at least one suction device, suction of air between the flexible mat of the treatment machine and the flexible film of the medical cassette taking place via one ore more suction openings arranged in the hard part of the cassette;
• and
• a medical cassette made of a hard part having liquid-conducting passages which are covered by a flexible film, the medical cassette including at least one suction opening arranged in the hard part of the cassette, said medical cassette being coupled to the coupling surface of the treatment machine.