Patent ID: 8703157

Claim:
A hydrogel composition comprising polyvinyl alcohol having a molecular weight of about 145,000 Da mixed together with water and polyethylene glycol, and separated into a solid phase and a liquid supernatant phase, wherein the solid phase comprises a total polymer content of about 70% to about 80% by weight of the solid phase and water in an amount of about 20% to about 30% by weight of the solid phase, wherein the liquid supernatant phase comprises a total polymer content of about 33% to about 42% by weight of the liquid supernatant phase and water in an amount of about 58% to about 67% by weight of the liquid supernatant phase, and wherein the total polymer content in the solid phase comprises about 20% to about 65% by weight of polyvinyl alcohol and about 2% to about 20% by weight of polyethylene glycol, wherein the hydrogel composition has a compressive chord modulus of about 450 kPa to about 5,000 kPa.