The invention relates to a storage and mixing system for pasty multicomponentpolymethylmethacrylate bone cements, the storage and mixing system comprisingafirst tubular cartridge (1) with a first cylindrical internal space containinga first startingcomponent (3), a first dispensing plunger (5), a second tubular cartridge (2)that isarranged within the first tubular cartridge (1), whereby the external wall ofthe secondcartridge (2) touches against the internal wall of the first cartridge (1) andis attachedto the internal wall of the first cartridge (1), whereby the second cartridge(2) containsa second starting component (4) and has a second dispensing plunger (6)arrangedin it, whereby a pressing device (7) with a clamping edge (8) for compressingthesecond cartridge (2) that can be propelled axially in the internal space ofthe firstcartridge (1) is arranged, as seen from the cartridge head (9), behind thefirstdispensing plunger (5) and the second dispensing plunger (6), whereby thepressingdevice (7) can be propelled appropriately in the direction of the cartridgehead (9)such that the second cartridge (2) is being progressively compressed axiallyduringthe motion of the pressing device (7) such that, in the process, the firstdispensingplunger (5) and the second dispensing plunger (6) are propelled in thedirection of thecartridge head (9).The invention also relates to a method for mixing a PMMA bone cement using adevice of this type.
