Patent ID: 8128276

Claim:
A device comprising a bone cement mixer ( 1 ) and a liquid container ( 3 ), wherein: the bone cement mixer ( 1 ) comprises at least one mixing space ( 5 ) for mixing of powder and liquid components ( 2 , 4 ), preferably a polymer and a monomer respectively, to make bone cement, the powder component ( 2 ) is placed in the mixing space ( 5 ) and the liquid component ( 4 ) is placed in the liquid container ( 3 ), the liquid component ( 4 ) is sucked out from the liquid container ( 3 ) to the mixing space ( 5 ) and the powder component ( 2 ) placed therein by means of vacuum generated in said mixing space, the liquid container ( 3 ) is a tube ( 15 ) or bag of such metal material which prevents the liquid component ( 4 ) from escaping from it, the tube ( 15 ) or bag has a connecting element ( 16 ) with a closing wall ( 21 ) which closes the tube ( 15 ) or bag, the tube ( 15 ) or bag is adapted to being opened when it is connected to a corresponding connecting element ( 17 ) on the bone cement mixer ( 1 ), the connecting element ( 17 ) on the bone cement mixer ( 1 ) has a seal ( 23 ) which closes the mixing space ( 5 ) of the bone cement mixer ( 1 ), wherein the connecting element ( 17 ) has an opening means ( 22 ) which, when the connecting element ( 16 ) of the tube ( 15 ) or bag is connected to the connecting element ( 17 ) of the bone cement mixer ( 1 ), pushes up first a hole in the seal ( 23 ) and then in the closing wall ( 21 ) in the connecting element ( 16 ) of the tube ( 15 ) or bag, such that the vacuum in the mixing space ( 5 ) of the bone cement mixer ( 1 ) can suck the liquid component ( 4 ) out from a liquid containing space ( 18 ) in the tube ( 15 ) or bag, past or through the opening means ( 22 ), and into the mixing space ( 5 ), and wherein the tube ( 15 ) or bag is designed and the metal material of the tube or bag has a thickness such that the tube ( 15 ) or bag is rigid when it contains the liquid component ( 4 ) and such that the volume of its liquid containing space ( 18 ) is brought to decrease when said vacuum in the mixing space ( 5 ) is brought to prevail also therein when the liquid component is sucked out therefrom wherein the opening means push in the same direction through the seal ( 23 ) and the closing wall ( 21 ).