Bone screw retaining and removal system
AssigneeSpectrum Spine, LLC
InventorJames C. Robinson
Life of this patent
Estimating the term…
Abstract
A bone screw retention system is provided for a plate which defines a plurality of transversely extending bores that are configured to receive a bone screw for engaging the plate to the cervical spine. One or more retention members, having an elliptical, arcuate, straight, or other shape, can be positioned therein a cavity of the plate such that portions of the retention member(s) extend into a portion of an upper region of each bore to retain a bone screw therein. A bone screw removal device is provided, having at least one tongue member configured to selectively displace the one or more retention members to allow the bone screw to be removed from the respective bore.
Claims23
A bone screw retention system for retaining bone screws therein, and releasing bone screws therefrom, a plate that defines a plurality of transversely extending bores configured for receiving bone screws and a retention member cavity corresponding to each bore, the retaining system comprising:
- an elastically deformable retention member having an edge portion, wherein at least a portion of the retention member is positioned therein each at least one cavity such that portions of the at least one retention member extend into an upper region of each of the bores, wherein the retention member is configured to mount therein the at least one cavity and is movable between a first relaxed position and a second compressed position, wherein, in the first relaxed position, a portion of the edge portion of the retention member extends inwardly substantially transverse to and toward the longitudinal axis of the respective bore and into the upper region of the bore, which decreases an effective inner diameter of the upper region of the bore, and wherein, in the second compressed position, portions of the retention member are medially biased outwardly away from the longitudinal axis of the bore towards an outer wall of the upper region of the bore, which increases the effective inner diameter of the upper region of the bore, and wherein in the first relaxed position, the retention member is a continuous closed loop.
A bone screw retention system comprising:
- a plate that defines a plurality of transversely extending bores configured for receiving bone screws and a retention member cavity corresponding to each bore;
- an elastically deformable retention member having an edge portion, wherein at least a portion of the retention member is positioned therein each cavity such that portions of the retention member extend into an upper region of each of the bores, wherein the retention member is configured to mount therein the cavity and is movable between a first relaxed position and a second compressed position, wherein, in the first relaxed position, at least a portion of the retention member extends inwardly substantially transverse to and toward the longitudinal axis of the respective bore and into the upper region of the bore which decreases an effective inner diameter of the upper region of the bore, and wherein, in the second compressed position, portions of the retention member are medially biased outwardly away from the longitudinal axis of the bore towards an outer wall of the upper region of the bore, which increases the effective inner diameter of the upper region of the bore, and wherein the retention member is a continuous closed loop;
- and
- a bone screw removal system.
Dependencies are inferred from the claim text.