Patent ID: 8809418

Claim:
A bone cement comprising; a first powder component containing polymer beads having a first average molecular weight and further containing a high molecular weight population of beads having a second average molecular weight that is higher than the first average molecular weight; and a second liquid component containing monomers, wherein, the first average molecular weight, the second average molecular weight, and the percentage of beads having the second average molecular weight are selected so that contacting the first component and the second component produces a mixture having a viscosity profile with three phases defining an initial period a working period, and a hardening period, wherein, during the initial period, the viscosity increases at a rate of change that decreases over time until the mixture attains a viscosity greater than 500 Pascal seconds within 180 seconds from mixing the first and second components, wherein, during, the working period of at least 5 minutes, the viscosity remains between 500 and 2000 Pascal seconds wherein, during the hardening period, the viscosity increases at a rate of change that increases over time until the mixture hardens, and wherein the mixture is suitable for in-vivo use.