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US 9,427,260 B2Granted
Closed-head polyaxial and monaxial screws
AssigneeGlobus Medical, Inc.
InventorsBrad Juchno, Milan George
Life of this patent
Estimating the term…
Abstract
A closed-head polyaxial screw for use in spinal instrumentation for spinal fusion, treatment of deformity, or the like. Polyaxial screws may have a two-part design, with the screw fitting into an aperture in the closed head. One or more clamps may secure the bone screw in the aperture. A closed-head polyaxial screw having a one part design is also disclosed. In addition, a one-part monaxial screw is described.
Claims19
A closed-head polyaxial screw comprising:
- a set screw;
- a bone screw having a head;
- a closed head comprising an upper aperture configured to receive the set screw, a lower aperture configured to receive the bone screw, and an aperture for receiving a rod, wherein the set screw comprises a retaining lip positioned near a bottom portion of the set screw that prevents the set screw from being removed from the upper aperture as the set screw is moved upwardly through the closed head;
- a first clamp surrounding at least a portion of the head of the bone screw to retain the bone screw in the lower aperture of the closed head and a second clamp surrounding at least a portion of the head of the bone screw, wherein the first clamp and the second clamp are configured to be inserted upwardly into the closed head such that the first clamp and the second clamp come to a stop when the first clamp comes into contact with the second clamp;
- and
- a wedge configured to be seated onto the first clamp and the second clamp, wherein the wedge is spaced from and capable of moving with respect to the bone screw.
3 more elements
A closed-head polyaxial screw comprising:
- a set screw;
- a bone screw having a head;
- a closed head comprising an upper aperture configured to receive the set screw, a lower aperture configured to receive the bone screw, and an aperture for receiving a rod, wherein the set screw comprises a retaining lip positioned near a bottom portion of the set screw that prevents the set screw from being removed from the upper aperture as the set screw is moved upwardly through the closed head;
- a first clamp surrounding at least a portion of the head of the bone screw to retain the bone screw in the lower aperture of the closed head and a second clamp surrounding at least a portion of the head of the bone screw, wherein the first clamp and the second clamp are configured to be inserted upwardly into the closed head such that the first clamp and the second clamp come to a stop when the first clamp comes into contact with the second clamp;
- and
- a wedge configured to be seated onto the first clamp and the second clamp, wherein the wedge surrounds upper portions of the first and second clamps.
3 more elements
Dependencies are inferred from the claim text.