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US 8,784,459 B2Granted
Spinal plate and locking screw devices, methods, and systems
AssigneeGenesys Spine
InventorsJosh Kaufman, Scott Bryant, Greg Calbert, John Stokes, Matthew Geck, Landon Gilkey
Life of this patent
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Abstract
An embodiment of the invention provides for a system, such as a cervical plate fusion system, that has mechanisms for preventing bone screws from backing out of the plate. The system prevents both counter-rotation of the screw and axial backing out of the screw. Other embodiments are described herein.
Claims20
An orthopedic fusion system comprising:
- a plate that includes first and second holes and a first cavity connecting the first and second holes;
- a single-piece monolithic resilient member included in the first cavity, the resilient member including a first arm connected to a first end having a first fin and a second arm connected to a second end having a second fin;
- a screw including a lip, which is coupled to a beveled shoulder, and a toothed wheel having first and second teeth;
- wherein (a) the resilient member is seperably coupled to the plate and within the first cavity;
- (b) the first cavity includes first and second channels that respectively include first and second portions of the resilient member;
- (c) the first and second fins respectively project into the first and second holes;
- (d) the first fin has a first angled leading edge and a first curved trailing edge, the first angled leading edge of the first fin being non-orthogonally connected to the first arm;
- (e) the first tooth has a first angled leading edge and a first curved trailing edge, the first angled leading edge of the first tooth being non-orthogonal to a tangent intersecting the toothed wheel at a same point the first angled leading edge of the first tooth intersects the toothed wheel;
- and (f) the first fin is sized to be received between the first and second teeth of the toothed wheel;
- wherein the system is configured such that (g) in a partially implanted position the screw is inserted into the first hole and the beveled shoulder is actively deflecting the first fin medially towards the first cavity;
- and (h) in a fully implanted position (1) the screw is inserted into the first hole such that the screw is prevented from backing out of the first hole by the first fin that has snapped back into the first hole to intercept the lip when the screws travels axially away from patient bone in which it is implanted and (2) the toothed wheel is allowed to rotate but is prevented from counter-rotating because the first curved trailing edge of the first fin is lodged against the first trailing edge of the first tooth.
8 more elements
An orthopedic system comprising:
- a plate that includes first and second holes;
- a resilient member including a first arm and a second arm;
- a bone anchor including a lip, which is coupled to a shoulder, and first and second teeth;
- wherein (a) the first and second arms respectively project to the first and second holes;
- (b) the first arm has a first leading edge and a first trailing edge;
- (c) the first tooth has a first leading edge and a first trailing edge;
- and (d) the first arm is sized to be received between the first and second teeth;
- wherein the system is configured such that (e) in a partially implanted position the bone anchor is inserted into the first hole and the shoulder is actively deflecting the first arm;
- and (f) in a fully implanted position (1) the bone anchor is inserted into the first hole such that the bone anchor is prevented from backing out of the first hole by the first arm that has snapped back to the first hole to intercept the lip when the bone anchor travels axially away from patient bone in which it is implanted, and (2) the bone anchor is allowed to rotate but is prevented from counter-rotating because the first trailing edge of the first arm is lodged against the first trailing edge of the first tooth;
- wherein a horizontal axis (a) intercepts the first and second arms, (b) does not intercept a lateral wall of the first hole, and (c) intercepts a medial wall of the first hole.
7 more elements
An orthopedic system comprising:
- a plate that includes first and second holes and a first cavity connecting the first and second holes;
- a single-piece monolithic resilient member configured to be included in the first cavity, the resilient member including a first arm connected to a first end having a first fin and a second arm connected to a second end having a second fin;
- wherein (a) the resilient member is configured to be seperably coupled to the plate and within the first cavity;
- (b) the first cavity includes first and second channels that respectively include first and second portions of the resilient member;
- (c) the first and second fins respectively project into the first and second holes;
- (d) the first fin has a first angled leading edge and a first curved trailing edge, the first angled leading edge of the first fin being non-orthogonally connected to the first arm;
- wherein the system is configured such that (e) when a bone anchor, in a partially implanted position, is inserted into the first hole a beveled shoulder included in the bone anchor actively deflects the first fin medially towards the first cavity;
- and (f) when the bone anchor, in a fully implanted position, is inserted into the first hole (1) the bone anchor is prevented from backing out of the first hole by the first fin that has snapped back into the first hole to intercept a lip, included in the bone anchor, when the bone anchor travels axially away from patient bone in which it is implanted, and (2) the bone anchor is allowed to rotate but is prevented from counter-rotating because the first curved trailing edge of the first fin is lodged against a first trailing edge of a first tooth included in the bone anchor.
5 more elements
Dependencies are inferred from the claim text.