Patent ID: 6235033
Filing Date: 2001-05-22
Classification: A61B

Abstract:
A bone fixation assembly comprising:(a) a fixation device having a through hole;(b) a bushing having:(i) upper and lower surfaces;(ii) a sidewall with an exterior surface configured and dimensioned for polyaxial rotation within the through hole of the fixation device and an interior surface which defines a bore that extends through the upper and lower surfaces; and(iii) at least one slot located on the sidewall for allowing outward expansion of the sidewall against the through hole of the fixation device to thereby lock the bushing at a selected angle relative to the axis of the through hole of the fixation device;(c) a fastening screw having:(i) a threaded shaft configured and dimensioned for insertion through the bore of the bushing and threadably insertable into bone to secure the bushing and fixation device to bone;(ii) a head configured and dimensioned for insertion in the bushing and including a radial wall and open end defining a recess; and(iii) at least one slit located on the radial wall for allowing outward expansion of the radial wall thereby outwardly expanding the sidewall of the bushing; and(d) a locking screw having a threaded body threadably received in the head of the fastening screw to thereby outwardly expand the radial wall of the fastening screw.