Patent ID: 8662736

Claim:
A bone cement system ( 100 ) comprising a mixing facility ( 10 ) for mixing and dispensing of bone cement, a reservoir container ( 112 ) for a monomer, and a conveyor ( 122 ), wherein the mixing facility ( 10 ) comprises a mixing cylinder ( 20 ); the mixing cylinder ( 20 ) stores a bone cement powder; the conveyor ( 122 ) conveys the monomer from the reservoir container ( 112 ) into the mixing cylinder ( 20 ); a sieve element ( 4 ) is arranged between the reservoir container ( 112 ) and the mixing facility ( 10 ) to prevent ingress of the bone cement powder from the mixing cylinder ( 20 ) into the conveyor ( 122 ), the sieve element ( 4 ) having a mesh size between 5 μm and 30 μm; the mixing facility ( 10 ) comprises a dispensing opening ( 23 ) for dispensing the bone cement mixed from the bone cement powder and the monomer; the dispensing opening ( 23 ) comprises a shield ( 1 ) having at least one through-opening ( 2 ); and a ratio of an area of the through-opening ( 2 ) to the area of the sieve element ( 4 ) is at most 1 to 3, and a distance between the shield ( 1 ) and the sieve element ( 4 ) is between 1 mm and 10 mm.