Patent ID: 8757866

Claim:
A device ( 10 ) for mixing and dispensing bone cement, the device comprising: a mixing cylinder ( 20 ) in which a mixing plunger ( 21 ) is arranged, the mixing plunger ( 21 ) being axially movable by an actuation rod ( 50 ) guided out in a sealed manner at a first cylinder end ( 30 ), a sealing plunger ( 42 ) arranged in a region of the first cylinder end ( 30 ) being axially movable on the actuation rod ( 50 ) and configured to seal the mixing cylinder ( 20 ) in a gas-tight manner, a sterilization plunger ( 41 ) comprising a gas-permeable grid, arranged in the region of the first cylinder end ( 30 ) between the mixing plunger ( 21 ) and the sealing plunger ( 42 ), being axially movable on the actuation rod ( 50 ) separately from the sealing plunger ( 42 ) and configured to seal the mixing cylinder ( 20 ) in a gas-permeable manner, wherein the gas-permeable grid is adapted to allow only particles smaller than 5 μm to pass therethrough; wherein the sterilization plunger ( 41 ) and the sealing plunger ( 42 ) form a two-part plunger system ( 40 ) having a sterilization position ( 150 ) and a mixing position ( 155 ), wherein in the sterilization position ( 150 ) the sterilization plunger ( 41 ) seals the mixing cylinder ( 20 ) in the gas-permeable manner and the sealing plunger ( 42 ) does not seal the mixing cylinder ( 20 ) in the gas-tight manner, such that the plunger system ( 40 ) enables a sterilization agent to both flow into the mixing cylinder ( 20 ) to rinse bone cement powder therein and exit the mixing cylinder ( 20 ), and in the mixing position ( 155 ), sealing plunger ( 42 ) seals the mixing cylinder ( 20 ) in the gas-tight manner, and allows the bone cement powder to be rinsed by a binding agent.