Spinal implants and spinal fixings

摘要

A spinal implant comprising an elongate body insertable between adjacent vertebrae, the elongate body comprising first and second portions, the first and second portions each having an internal surface, the internal surface of the first portion facing the internal surface of the second portion in use, at least part of each internal surface of the first and second portions being threaded, the spinal implant further comprising a bolt, at least part of the bolt being externally tapered and externally threaded, the external threads of the bolt corresponding with the threads of the internal surfaces of the first and second portions, wherein the bolt is insertable between the first and second portions of the elongate body such that the external threads of the bolt engage with the internal threads of the elongate body, whereby rotation of the bolt in the threaded internal surfaces of the first and second portions causes relative movement of first and second portions away from one another.

主权项

1. A spinal fixing comprising
a fixing part for fixing to a part of a subject's spine, the fixing part having a first end, the first end having a head that is at least partially spherical; an elongate extension, the elongate extension having a first end, the first end having a head that is at least partially spherical; a coupling body for receiving the first end of the fixing part and the first end of the elongate extension therein; and a washer located between the first end of the fixing part and the first end of the elongate extension in use, the washer having first and second opposing surfaces being concavely curved, the first surface facing the first end of the elongate extension in use and the second surface facing the first end of the fixing part in use, the radius of curvature of the first surface being smaller than the radius of curvature of the at least partially spherical end of the elongate extension such that the washer makes a circular line of contact with the first end of the elongate extension when the spinal fixing is assembled and the radius of curvature of the second surface being smaller than the radius of curvature of the at least partially spherical end of the fixing part such that the washer makes a circular line of contact with the first end of the fixing part when the spinal fixing is assembled.