Assembly for treating an isthmic fracture

摘要

An assembly is disclosed for treating an isthmic fracture. It also relates to an assembly which includes materials and instruments for utilizing the assembly in connection with treating the fracture.

主权项

1. An assembly for treating an isthmic fracture of a vertebra comprising:
a rigid rod comprising a rod portion, and an eyelet disposed at a first end of said rod portion; a pedicle screw having a receiving zone upon which said eyelet of said rigid rod is capable of being engaged, said pedicle screw being capable of engaging a pedicle portion of the vertebra; at least one hook comprising a curved part capable of engaging a lamina portion of the vertebra so as to operatively cooperate with said pedicle screw in drawing the pedicle and lamina portions of the vertebra together, and a body pierced with a conduit designed to receive a second end portion of said rod portion of said rigid rod, which is opposite said first end of said rod portion, said at least one hook comprising immobilizing means adapted to engage said second end portion of said rod portion of said rigid rod for immobilizing said at least one hook in position along said second end portion of said rod portion; a set screw for engaging an outer bone portion of an isthmus portion of the vertebra, said set screw having a first threaded portion and a second non-threaded portion; and a mounting piece disposed upon said rod portion and having an internally threaded bore for receiving and threadedly cooperating with said first threaded portion of said set screw while said set screw extends through said mounting piece such that said second non-threaded portion of said set screw engages the outer bone portion of the isthmus portion of the vertebra, whereby when said set screw is screwed toward the outer bone portion of the isthmus portion of the vertebra, said first threaded portion of said set screw cooperates with said mounting piece so as to immobilize said mounting piece upon said rod portion while said second non-threaded portion of said set screw exerts a predetermined amount of pressure against the outer bone portion of the isthmus portion of the vertebra so as to bring the outer bone portion of the isthmus portion of the vertebra into contact with an inner bone portion of the isthmus portion of the vertebra.