One aspect relates to a device to produce a bone cement paste from a monomer liquid and a cement powder as starting components of the bone cement paste, and to dispense the mixed bone cement paste. The device includes a cartridge with a cylindrical interior, a dispensing plunger movable towards the front of the cartridge; a receptacle extending along a longitudinal direction, a front of the receptacle connected with the rear of the cartridge; a pumping plunger arranged and in the receptacle movable towards the front of the receptacle; a breakable ampoule containing the monomer liquid, the ampoule with ampoule body arranged in the receptacle between the pumping plunger and the dispensing plunger with at least some sections of the ampoule body in contact with the receptacle; and a spacer arranged in the receptacle between the dispensing plunger and the ampoule body, the spacer extending in the longitudinal direction of the receptacle and the spacer being separated from the inner wall of the receptacle by a distance at least as large as the wall thickness of the ampoule body.