Bone fixation assembly
First Claim
1. 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.
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Accused Products
Abstract
The present invention relates to a bone fixation assembly for securing a fixation device, such as a bone plate, to bone. The assembly includes the fixation device, a bushing, a fastening screw, and a locking screw. The bushing is seated within a through hole in the fixation device and can rotate within the through hole and has a sidewall with a bore. The sidewall has at least one slot for allowing outward expansion of the sidewall against the through hole to thereby lock the bushing at a selected angle relative to the axis of the through hole. The fastening screw has a threaded shaft for insertion through the bore of the bushing and threads into bone to secure the bushing and fixation device to bone. The head of the fastening screw fits in the bushing and includes a radial wall and open end defining a recess. The radial side wall has at least one slit for allowing outward expansion of the radial wall thereby outwardly expanding the sidewall of the bushing. The locking screw has a body that threads in the head of the fastening screw to thereby outwardly expand the radial wall of the fastening screw.
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Citations
16 Claims
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1. A bone fixation assembly comprising:
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(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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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Specification