Bone cement and method of preparation

An all-liquid bone cement product free of reinforcing fillers and consisting of a plurality of liquid components in separate containers to be mixed and reacted together with only limited exposure to air to produce a polymerized bone cement;

• one of said liquid components comprising a first solution consisting essentially of a linear polymer or copolymer of poly(methyl methacrylate), and a polymerization inhibitor, completely dissolved in a non-crosslinking monomer;
• another of said liquid components comprising a second solution of said non-crosslinking monomer in which is dissolved a polymerization inhibitor and a polymerization initiator;
• said product also comprising one of said plurality of liquid components other than said second solution including a polymerization activator;
• the ratio by weight/volume of said polymer to said monomer in said plurality of liquid components taken together being in the range of about 0.5:1 to about 2:1 g/ml.

An all-liquid bone cement product free of reinforcing fillers and consisting of at least two liquid components in separate containers to be mixed and reacted together with limited exposure to air to produce a polymerized bone cement;

• one of said components comprising a first liquid solution consisting essentially of a linear polymer or copolymer of poly(methyl methacrylate) completely dissolved in a non-crosslinking monomer;
• said first solution also having dissolved therein a polymerization inhibitor and one of either a polymerization activator or a polymerization initiator;
• another of said components comprising a second liquid solution consisting essentially of said non-crosslinking monomer in which is dissolved a polymerization inhibitor and whichever of said polymerization activator and said polymerization initiator is not present in said first liquid solution;
• the ratio by weight/volume of said polymer to said monomer in said plurality of liquid components taken together being within the range of about 0.5:1 to about 2:1 ml.

A method of making bone cement comprising the step of mixing together a plurality of premixed liquid components, each free of reinforcing fillers, under substantially air-free conditions to prevent air entrapment and avoid porosity in the resulting cement;

• one of said premixed liquid components comprising a first solution consisting essentially of a linear polymer or copolymer of poly (methyl methacrylate), and a polymerization inhibitor, completely dissolved in a non-crosslinking monomer;
• another of said liquid components comprising a second solution of one of either a polymerization activator or a polymerization initiator;
• one of said plurality of liquid components, other than said second solution, having dissolved therein whichever of said polymerization activator and said polymerization initiator is not present in said second solution;
• the ratio by weight/volume of said polymer to said monomer in said plurality of liquid components taken together being within the range of about 0.5:1 to about 2:1 g/ml.