Selectively expanding spine cage, hydraulically controllable in three dimensions for vertebral body replacement
First Claim
Patent Images
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; and
a curable polymer having a fluid state for providing hydraulic communication of mechanical force from said master cylinder to said slave cylinders to elevate said pistons to a position that provides desired spinal correction;
wherein said polymer cures to a solid state to lock said pistons at said desired correction.
3 Assignments
0 Petitions
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 vertebral bodies to effectively distract the disc space and rigidly fix the spine. Extendible members with multiple interfitting stages permit a relatively large range of distraction capability in a compact package.
278 Citations
20 Claims
-
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; and a curable polymer having a fluid state for providing hydraulic communication of mechanical force from said master cylinder to said slave cylinders to elevate said pistons to a position that provides desired spinal correction; wherein said polymer cures to a solid state to lock said pistons at said desired correction. - View Dependent Claims (2, 3, 4, 5, 6)
-
-
7. 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 stages configured to be immovably locked in an expanded position, said cylinder block defining a bone graft infusion aperture communicating with a conduit coupleable with a source of bone graft material for infusion of said bone graft material into an intervertebral space.
-
-
8. 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:
-
a slave cylinder block defining at least first and second cylinders, said cylinders receiving corresponding pistons, each piston comprising at least two interfitted stages configured to be immovably locked in an expanded position and a surface for expanding against an adjacent end plate to impart a desired spinal correction; 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; and a master cylinder located away from the patient, and connected to the slave cylinders through control lines containing a hydraulic fluid said matter cylinder providing independent, selective hydraulic actuation of the slave pistons, said hydraulic fluid comprising a polymer that cures to a solid state to lock the slave pistons immovably in place at a desired amount of spinal correction; wherein independent operation of the slave pistons imparts a desired anterior/posterior spinal correction and wherein differential operation of the pistons with respect to one another imparts a desired lateral spinal correction. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16)
-
-
17. An apparatus for providing support between vertebral bodies, comprising:
-
a. a base including a first pressure applying plate having a bone engaging surface; b. at least first and second extendable members cooperating with the base, each having multiple interfitting stages and being adapted to be independently extended wherein at least one of the first and second extendable members has at least three interfitting stages; c. a second pressure applying plate coupled to the extendable member having a corrective bone engaging surface. - View Dependent Claims (18, 19, 20)
-
Specification