#$%^&*AU2016204667A120170202.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 evacuable internal space for mixing of the bone cement, a pump (3) with a plunger (22) that can be moved by hand to generate a low pressure, and a connecting conduit (12) connecting the internal space of the at least one cartridge (4) to the pump (3) for generating a low pressure, whereby the pump (3) comprises an operating element (21) that can be operated from outside and is connected appropriately to the plunger (22) such that it is suitable for moving the plunger (22) in the pump (3) by hand such that a low pressure can be generated such that the low pressure of the pump (3) can be used to evacuate gas from the internal space of the at least one cartridge (4) through the connecting conduit (12). The invention also relates to a method for the mixing of polymethylmethacrylate bone cement in an internal space of a cartridge (4) of a vacuum mixing system, in particular of a vacuum mixing system according to any one of the preceding claims, in which a motion of a manually driven plunger (22) of a pump (3) of the vacuum mixing system is used to generate a low pressure in the pump (3), whereby the pump (3) thus driven is used to evacuate the internal space of the cartridge (4) and then to mix the bone cement in the internal space of the cartridge (4).
