Dynamized vertebral stabilizer using an outrigger implant
OwnerRobert A Dixon, Donald J Hackmaninventors
Life of this patent
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Abstract
A device and a method for stabilizing lumbar and thoracic vertebra or individual bones in human spine or bone column is provided for the purpose of fixing a vertebra or individual bone with respect to other vertebra or individual bones and with respect to other parts of the spinal or bone column. While providing spinal stabilization, the stabilizer allows axial load sharing or construct dynamized action. The device allows the vertebra or individual bones to be held in compression allowing subsidence along the plate axis or to be fixed with respect to the plate for rigid stabilization. The vertebra or individual bones will be prevented from distraction by a stop lock clamp. The device may be configured as a fully or partially rigid system.
Claims7
A sliding plate bone stabilizing system, for the purpose of fixing one bone with respect to one or more other bones, comprising:
- a. a plate member for placement adjacent to individual bones in a column, said column having a longitudinal bone column axis substantially through the center of said individual bones, said plate having a plate axis essentially parallel to the said bone column axis, said plate axis extending the length of the longest dimension of said plate;
- b. said plate having an upper face, a lower face, two substantially parallel side faces, a thickness of sufficient strength to substantially eliminate bending, and a plate through slot substantially parallel to said plate axis;
- said slot having a width to accommodate attachment devices;
- c. a plate guide, said plate guide having two fixed guide tubes configured and sized to slide freely in said slot, said fixed guide tubes having a length greater than the said slot depth so as to protrude above the said plate, and having an outrigger arm with a screw clearance hole in the end of said outrigger arm away from said fixed guide tubes perpendicular to the said plate and said outrigger arm, substantially perpendicular and substantially in the plane of said plate guide;
- d. a bone screw, said bone screw having a bone threaded portion, a machine threaded stud portion, and a driving portion between said bone threaded portion, and said bone threaded portion configured and sized to threadably engage said individual bones, and said machine threaded stud portion sized to slidably engage said guide tubes inside diameters, said machine screw to affix said plate to said individual bones;
- e. a self tapping anterior bone screw, said anterior bone screw to engage said outrigger threaded hole and threadably engage said individual bones;
- f. at least one clamp nut sized and threaded to engage said machine threaded stud portion, and having an undercut center and an outer flange, where said undercut center maintains clearance for said tube protrudance and said outer flange to clamp against said plate upper face.
Dependencies are inferred from the claim text.