Method and device for extruding bone cement under vacuum

A method for preparation of bone cement, comprising:

• providing a closed mixing chamber having a detachably fixed wall section that is moveable within the chamber, an extrusion nozzle defining an extrusion opening, and a sealing device arranged within the extrusion nozzle and sealing the extrusion opening;
• mixing constituent components of bone cement under vacuum in the mixing chamber to form bone cement;
• compressing the bone cement in the mixing chamber by actuating the wall section toward the extrusion opening with the sealing device arranged in the extrusion nozzle, wherein during compression the sealing device is forced partially out of the extrusion nozzle by a column of bone cement that is formed in the extrusion nozzle;
• terminating compression after a desired length of the column of bone cement is formed;
• and
• cutting the extrusion nozzle off just ahead of the front of the column of bone cement.

A device for preparing and extruding bone cement, comprising:

• a mixing chamber equipped with a vacuum connection for connection to a vacuum source, the mixing chamber having an extrusion opening and a moveable wall section within the mixing chamber and moveable toward the extrusion opening;
• a device configured and arranged to maintain the moveable wall section at an initial POSITION during mixing of bone cement constituents in the mixing chamber;
• a sealing device configured and arranged to seal the extrusion opening;
• and
• an extrusion tool that includes a sleeve that is configured and arranged to receive the mixing chamber, and a mechanism that is configured and arranged to apply an actuating force to the moveable wall section to perform extrusion, and wherein the sleeve is configured and arranged to allow the connection between the vacuum source and the vacuum connection to be maintained during extrusion of the bone cement.