Patent ID: 7988696

Claim:
A perforated balloon for forming a hardened orthopaedic paste in a bone comprising a neck portion adapted to be mounted on an end of a tube through which an 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 the improvement comprises a rupture array formed on said perforated balloon for initiating a rupture of said perforated balloon when the perforated balloon is dilated to exceed a critical size and where said rupture array comprises pores, dents, notches, grooves or cuts formed on said perforated balloon, which function as weak spots so that said rupture occurs along at least a portion of said weak spots; and wherein said weak spots form one or more dotted lines.