Disposable mixer and homogeniser

The invention relates to a device for the mixing, homogenizing, extraction, or slurrying of materials, in particular infectious, or malodorous or chemically-aggressive materials ( 71 ) in a laboratory test vessel ( 70 ) which may be hermetically sealed with a lid ( 10 ). A stirrer element ( 30 ) is provided in the lid ( 10 ) for processing of the material ( 71 ) placed in the laboratory test vessel ( 70 ), with the stirrer element being connected to a coupling piece ( 50 ). Cutting and/or crushing elements ( 31; 33, 35 ) arranged directly adjacent to cutting edges ( 42, 44; 41, 43, 45 ) on a retainer sleeve ( 40 ), comminute the material. The stirrer element ( 30 ) is a hollow cylinder ( 53 ) and is provided with a central sealing cap ( 32 ) such that the homogenate ( 71 ) can be manually or automatically diluted or pipetted from the laboratory test vessel ( 70 ) by means of a pipette or a needle or disposable tip without removing the disposable lid ( 10 ), or analyzed with a sensor or heated or cooled by means of a heating or cooling bar.