Selectively expanding spine cage, hydraulically controllable in three dimensions for vertebral body replacement
First Claim
1. An apparatus for providing vertebral repair and replacement, comprising:
- a selectively expanding spinal implant configured for insertion and rigid fixation between opposed vertebral bodies of a patient, said spinal implant comprising;
a cylinder block comprising a body configured and dimensioned for resting on a first vertebral body defining two or more slave cylinders with corresponding pistons having a corrective bone engaging surface for expanding against a second, opposed vertebral body, wherein each said piston comprises at least first and second interfitted stage.
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Accused Products
Abstract
A selectively expanding spine cage has a minimized diameter in its unexpanded state that is smaller than the diameter of the neuroforamen through which it passes in the distracted spine. The cage conformably engages between the endplates of the adjacent vertebrae to effectively distract the anterior disc space, stabilize the motion segments and eliminate pathologic spine motion. The cage enhances spinal arthrodesis by creating a rigid spine segment. Expanding selectively, the cage height increases and holds the vertebrae with fixation forces greater than adjacent bone and soft tissue failure forces in natural lordosis. Stability is thus achieved immediately, enabling patient function by eliminating painful motion. Greater distraction height is achieved without an increase in implant size through the use of interfitted stages.
145 Citations
19 Claims
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1. An apparatus for providing vertebral repair and replacement, comprising:
a selectively expanding spinal implant configured for insertion and rigid fixation between opposed vertebral bodies of a patient, said spinal implant comprising; a cylinder block comprising a body configured and dimensioned for resting on a first vertebral body defining two or more slave cylinders with corresponding pistons having a corrective bone engaging surface for expanding against a second, opposed vertebral body, wherein each said piston comprises at least first and second interfitted stage. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A selectively expandable spinal implant for insertion between and rigid fixation of opposed vertebral bodies of a patient for reconstruction or repair of the patient'"'"'s spine, comprising:
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a slave cylinder block defining at least first and second cylinders, said cylinders receiving corresponding pistons, each piston comprising at least two interfitted stages and a surface for expanding against an adjacent end plate to impart a desired spinal correction; and a bone engaging plate moveably attached to the surface of the pistons to provide an anterior/posterior corrective angle depending on relative expansion of the pistons. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19)
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Specification