section 43 adjacent the agitator element 24 a sealing gasket 44 is provided on top of the piston element 34 the dimensions of the piston element 34 have been designed such that the piston element 34 fits into the tubular body 12 and retains its position thereby the container 36 contains a liquid monomer indicated by short lines 46 as one of the starting components for the polymerization reaction in order to prepare cement a part of the tubular body 12 together with the first axial end wall 14 and the piston element 34 define a chamber generally indicated by reference numeral 48 wherein powder particles 50 of a polymer as the other starting component are contained the side 52 of the agitator element 24 facing towards the piston element 34 supports opening means 54 which are in this case hollow needles 56 having an opening 58 in the peripheral wall 60 and an open bottom end 62 the agitator element 24 is mounted between two annular plates 64 fixed to the shaft 22 see fig2 the annular plates 64 have a smaller radius than the agitator element 24 itself so that the recesses 30 and holes 32 remain open the shaft 22 comprises an axial channel 66 extending between an open bottom end 26 and a top end 70 which is provided with a vacuum port 72 having a one way valve 74 this vacuum port 72 is arranged in handle 76 a snap connection 78 for fast connection to a vacuum source is mounted onto the vacuum port 72 generally the device 10 having the pre packaged components 46 and 50 will be packaged itself in a suitable pliable and sterile envelope when polymeric cement is needed this envelope is removed.