Patent ID: 8409212

Claim:
A method for forming a hardened orthopaedic paste in a bone comprising continuously or intermittently injecting a liquid or gas into a perforated balloon containing a hardened orthopaedic paste therein in a bone cavity until the perforated balloon is dilated to exceed a critical size, and thus ruptures; further comprising inserting a major portion of said perforated balloon in said bone cavity before injecting said orthopaedic paste into said perforated balloon, wherein said perforated balloon comprises a neck adapted to be mounted on an end of a tube through which said orthopaedic paste is injected into the perforated balloon; and leaking perforations, wherein said leaking perforations have a size which is penetrable to liquid contained in said orthopaedic paste but substantially impenetrable to powder contained in said orthopaedic paste under an expanded condition of said perforated balloon, in which a rupture array is formed on said perforated balloon for initiating said rupture of said perforated balloon when the perforated balloon is dilated to exceed said critical size; and wherein said rupture array comprises pores having a size which is penetrable to liquid contained in said orthopaedic paste but substantially impenetrable to powder contained in said orthopaedic paste under an expanded condition of said perforated balloon.