Patent ID: 9649404
Date: 2017-05-16
CPC Classifications: A61L

Claim:
1. A binary composition for the preparation of a fluid, injectable bone cement for filling bones with mechanical properties equivalent to those of vertebral spongy bone, said fluid, injectable bone cement having a Young's modulus of less than 1500 megapascals, wherein said binary composition comprises: a liquid phase L comprising a methyl methacrylate monomer; and a powder phase P comprising 70 to 99% by weight of a poly(methyl methacrylate) prepolymer combined with an inorganic type radiopaque compound and 1 to 30% by weight of calibrated hydrophilic flexible solid particles having an average diameter between 300 and 1,000 μm, wherein the P:L ratio in said binary composition is between 3 and 4.6 and wherein the weight ratio of (a) the poly(methyl methacrylate) prepolymer powder, the methyl methacrylate monomer, and the radiopaque component to (b) the hydrophilic flexible solid particles ranges from 2:1 to 100:1.