Bone cement mixing device with spacer in an ampoule receptacle

A method of producing a bone cement paste, whereby the bone cement paste is produced from a cement powder and a monomer liquid, the method comprising:

• A) pressing a pumping plunger in a longitudinal direction towards a dispensing plunger, wherein an ampoule containing the monomer liquid and a spacer that extends in the longitudinal direction in a receptacle are arranged between the pumping plunger, which can move in the longitudinal direction, and the dispensing plunger;
• B) wherein movement of the pumping plunger towards the dispensing plunger causes an ampoule head of the ampoule to be broken open or broken off, a free end of the spacer being moved inside the opened ampoule against an ampoule body of the opened ampoule so that at least a part of a wall of the ampoule body is arranged between the spacer and an inner wall of the receptacle during the movement;
• C) wherein the opened ampoule is compressed and further broken by the movement of the pumping plunger towards the dispensing plunger, and the monomer liquid is thus squeezed out of the receptacle and into the cement powder, where it mixes with the cement powder to form the bone cement paste;
• and
• D) wherein the spacer is clamped between the pumping plunger and the dispensing plunger and thus prevents a further reduction of a separation of the dispensing plunger to the pumping plunger and thus a further discharge of monomer liquid from the receptacle into the bone cement paste.