Spinal fixation plates
First Claim
1. A spinal fixation assembly, comprising:
- a fusion cage having an anterior face and a posterior face, and a superior face and an inferior face, the fusion cage being configured to be positioned between adjacent vertebrae such that at least a portion of the superior face contacts an endplate of a superior vertebra and at least a portion of the inferior face contacts an endplate of an inferior vertebra, the fusion cage having a first recess disposed in the superior face and a second recess disposed in the inferior face; and
a spinal fixation plate havingan anterior face and a posterior face,at least one bone screw aperture extending through the anterior and posterior faces for receiving a bone screw configured to mate the spinal fixation plate to bone, the at least one bone screw aperture being obliquely angled relative to the posterior and anterior faces of the spinal fixation plate,a central opening being disposed substantially at a center of the spinal fixation plate, andfirst and second arms extending outward from the posterior face of the plate, the first and second arms being configured to slidably contact the fusion cage such that the first arm extends across and contacts the first recess of the fusion cage and the second arm extends across and contacts the second recess of the fusion cage.
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Accused Products
Abstract
Spinal fixation plates for maintaining adjacent vertebrae in and fixed position are provided. In an exemplary embodiment, the plate includes opposed superior and inferior portions that are angled in a direction anterior to an anterior face of a mid-portion of the plate. The plate also includes a curvature formed therein about a longitudinal axis in a sagittal plane thereof. In use, when the plate is attached to adjacent vertebrae, the angle of the superior and inferior portions and the curvature in the plate are effective to position one or more thru-bores formed in the superior and inferior portions at the anterior rims of the adjacent vertebrae. In another embodiment, a spinal fixation plate is provided that is adapted to engage and mate to a fusion cage or other vertebral implant disposed between adjacent vertebra. The present invention also provides spinal fixation kits or assemblies, and methods for implanting the same.
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Citations
20 Claims
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1. A spinal fixation assembly, comprising:
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a fusion cage having an anterior face and a posterior face, and a superior face and an inferior face, the fusion cage being configured to be positioned between adjacent vertebrae such that at least a portion of the superior face contacts an endplate of a superior vertebra and at least a portion of the inferior face contacts an endplate of an inferior vertebra, the fusion cage having a first recess disposed in the superior face and a second recess disposed in the inferior face; and a spinal fixation plate having an anterior face and a posterior face, at least one bone screw aperture extending through the anterior and posterior faces for receiving a bone screw configured to mate the spinal fixation plate to bone, the at least one bone screw aperture being obliquely angled relative to the posterior and anterior faces of the spinal fixation plate, a central opening being disposed substantially at a center of the spinal fixation plate, and first and second arms extending outward from the posterior face of the plate, the first and second arms being configured to slidably contact the fusion cage such that the first arm extends across and contacts the first recess of the fusion cage and the second arm extends across and contacts the second recess of the fusion cage. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A spinal fixation assembly, comprising:
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a fusion cage having superior and inferior bone-contacting surfaces, and at least one arm-guide formed therein; a spinal fixation plate having first and second bone screw bores formed therein, and at least one arm formed thereon and configured to extend into the at least one arm-guide in the fusion cage, the first and second screw bores each having a central longitudinal axis that extends at an acute angle relative to first and second faces of the spinal fixation plate; and first and second bone screws configured to extend respectively through the first and second bone screw bores for mating the spinal fixation plate to bone; wherein the spinal fixation plate includes an opening formed therein and positioned along a horizontal longitudinal axis of the plate and a screw received in the opening; wherein the first and second bone screw bores are offset from the horizontal longitudinal axis, the first bone screw bore being positioned on a first side of the horizontal longitudinal axis and the second bone screw bore being positioned on a second side of the horizontal longitudinal axis; wherein, when the first and second bone screws are disposed through the first and second bone screw bores, a distance between each of the first and second bone screws and one of the superior and inferior surfaces of the fusion cage increases in a direction from the second face of the spinal fixation plate to distal ends of the first and second bone screws. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A spinal fixation assembly, comprising:
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a fusion cage having an anterior face and a posterior face, and a superior face and an inferior face, the superior face comprising a superior-facing bone-engaging surface and a superior-facing recessed surface that is open to a superior end of the cage and the inferior face comprising an inferior-facing bone-engaging surface and an inferior-facing recessed surface that is open to an inferior end of the cage, the fusion cage being configured to be positioned between adjacent vertebrae such that the superior-facing bone-engaging surface contacts an endplate of a superior vertebra and the inferior-facing bone-engaging surface contacts an endplate of an inferior vertebra; and a spinal fixation plate having an anterior face and a posterior face, at least one bone screw aperture extending through the anterior and posterior faces for receiving a bone screw configured to mate the spinal fixation plate to bone, the at least one bone screw aperture being obliquely angled relative to the posterior and anterior faces of the spinal fixation plate, a central opening being disposed substantially at a center of the spinal fixation plate, and first and second arms extending outward from the posterior face of the plate, the first and second arms being configured to slidably contact the fusion cage such that the first arm extends along the superior-facing recessed surface of the fusion cage and the second arm extends along the inferior-facing recessed surface of the fusion cage. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification