#$%^&*AU2015202970B220160915.pdf#####VACUUM MIXING SYSTEM AND METHOD FOR THE MIXING OF POLYMETHYLMETHACRYLATE BONE CEMENT ABSTRACT The invention relates to a vacuum mixing system for the mixing of polymethylmethacrylate bone cement comprising at least one cartridge (4) having an evacuatable internal space (5) for the mixing of the bone cement, whereby the internal space (5) comprises a cylindrical swept volume, a mixing element (12) that is arranged in the internal space (5) of the cartridge (4) such as to be mobile and can be operated from outside the vacuum mixing system in order to mix the content in the internal space (5) of the cartridge (4), and a dispensing plunger (2) having a cylindrical external circumference whose first base surface borders a base surface of the internal space (5) of the cartridge (4) and which can be or is locked to the cartridge (4) in detachable manner and which, in the detached state, is mobile in the cylindrical region of the internal space (5) of the cartridge (4), whereby a gas-permeable and particle-impermeable feedthrough (1) is arranged in the dispensing plunger (2) or a feedthrough (1) is formed between the dispensing plunger (2) and the internal wall of the internal space (5), whereby the feedthrough (1) extends from an opening in the jacket surface of the dispensing plunger (2) to an opening in the first base surface of the dispensing plunger (2). The invention also relates to a method for the mixing of polymethylmethacryl ate bone cement in a cartridge (4) of a vacuum mixing system.3/10 14 11 16 36 2 42 32 34 30 1 24 20 243 262 22 -10 4 5 12 Y2W-6 8 Figure 3
