A device for mixing polymethyl methacrylate bone cement and for storing the parent components of the bone cement, in particular a monomer liquid and a cement powder as parent components of the bone cement, the device having a cartridge (8) comprising an interior for mixing the bone cement, wherein the interior is closed on one side by a movable delivery plunger (26, 28), a receptacle (4) comprising side walls for receiving a monomer liquid container (5), which side walls are closed at least in some regions, wherein the receptacle (4 has at least one deformable closed side wall (6), a screen (42) and/or a filter (42) which is or are arranged below the receptacle (4) so that the contents of the opened monomer liquid container (5) flow through the screen (42) and/or the filter (42), a connecting line (9) through which the monomer liquid is to be routed into the interior of the cartridge (8), a hollow cylinder (1) which is connected to the connecting fine (9) and which is connected to the receptacle (4) by way of a fluid connection (44) so that the hollow cylinder (1) is arranged in a fluid line (9) between the receptacle (4) and the interior of the cartridge (8), wherein a pump plunger (2) is arranged in the hollow cylinder (1), which is axially displaceable in the hollow cylinder (1), and an opening device (3), which is movably mounted against the deformable side wall (6) of the receptacle (4), wherein the opening device (3) extends into the hollow cylinder (1), wherein, by pressing the pump plunger (2) into the hollow cylinder (1), the opening device (3) is to be pressed against the deformable side wall (6) of the receptacle (4) so that the deformable side wall (6) deforms in such a way that a monomer liquid container (5) located in the receptacle (4) is to be opened by the pressure of the opening device (3). The invention also relates to a method for mixing polymethyl methacrylate bone cement.
