Laminoplasty with laminar stabilization method and system

Abstract

Fixation devices and methods for stabilization of the lamina after laminoplasty are described. The device comprises of a plate with several holes that receive bone fasteners. The plate is curved at the ends to contour to the vertebral structure and has appendages to engage the displaced lamina in a fixed position. Alternatively, the plate has a bone fusion spacer in the middle to engage and fuse the lamina in the displaced position. Several methods of dynamically stabilizing the lamina after either the open door, double door or expansive laminoplasty technique are provided.

What I claim as my invention is:  
     
         1 . A bone stabilization device for the lamina of the spine after laminoplasty comprising an elongated plate with curvature at the ends of the longitudinal axis, downward for fixation to a lamina and upward for fixation to a facet by means of a screw through bone screw receiving holes at each end of the said plate  
     
     
         2 . The bone stabilization device of  claim 1  further including: 
 an appendage on either end perpendicular to the longitudinal plate axis and prior to the curvature at both ends to engage between the lamina and the facet  
 
     
     
         3 . The bone stabilization device of  claim 1  further including: 
 a bone fusion device wherein said plate is attached to the bone fusion device in the middle with the longitudinal plate edges allowing for bone fixation  
 
     
     
         4 . A bone stabilization device of  claim 1  wherein said plate has a curved appendage at one end and a straight appendage at the other end perpendicular to the longitudinal plate axis and prior to the curvature at both ends  
     
     
         5 . A bone stabilization device of  claim 1  wherein said plate has a curved appendage at one end perpendicular to the longitudinal plate axis and prior to the curvature  
     
     
         6 . A bone stabilization device of  claim 1  wherein said plate has a plurality of bone screw receiving holes throughout the plate  
     
     
         7 . A bone stabilization device of  claim 1  wherein said device is made from a biocompatible material selected from the group consisting of titanium, titanium alloys, surgical steel, polymeric material, ceramic material, resorbable material, polyglyconate, and hydroxyapatite  
     
     
         8 . A bone fusion device of  claim 3  wherein said device is made from either bone, hydroxyapatite or a resorbable material  
     
     
         9 . A bone stabilization device for the lamina of the spine after laminoplasty comprising of an elongated plate with bone screw receiving holes at the ends wherein said plate has a downward curvature at both ends to allow for fixation to the lamina via screws  
     
     
         10 . The bone stabilization device of  claim 9  further including: 
 a curved appendage in the middle perpendicular to the longitudinal plate axis and prior to the curvature at both ends to secure the lamina  
 
     
     
         11 . The bone stabilization device of  claim 9  further including: 
 a bone fusion device wherein said plate is attached to the bone fusion device in the middle with the longitudinal plate edges allowing for bone fixation via bone fasteners  
 
     
     
         12 . A bone stabilization device of  claim 9  wherein said plate has straight appendages in the middle perpendicular to the longitudinal plate axis and prior to the curvature at both ends  
     
     
         13 . A bone stabilization device of  claim 9  wherein said plate has a plurality of bone screw receiving holes throughout the plate  
     
     
         14 . A bone stabilization device of  claim 9  wherein said device is made from biocompatible material selected from the group consisting of titanium, titanium alloys, surgical steel, polymeric material, ceramic material, resorbable material, polyglyconate, and hydroxyapatite  
     
     
         15 . A bone fusion device of  claim 11  wherein said device is made from either bone, hydroxyapatite, or a resorbable material  
     
     
         16 . A bone stabilization device of  claim 9  further including: a L-shaped curvature at the end on both sides to allow for fixation to the facets by means of bone fasteners  
     
     
         17 . A spacer for the lamina of the spine after laminoplasty comprising of a rectangular shape with concave curved edges contoured at the longitudinal ends to allow for engagement between the lamina  
     
     
         18 . A spacer for the lamina of the spine after laminoplasty comprising of a rectangular shape wherein both edges at the end of the longitudinal axis of the said spacer have a superior cuff to allow for engagement between the lamina  
     
     
         19 . A spacer of  claim 17  wherein said device is made from either bone, hydroxyapatite, or a biocompatible material suitable for bone fusion  
     
     
         20 . A spacer of  claim 18  wherein said device is made from either bone, hydroxyapatite, or a biocompatible material suitable for bone fusion  
     
     
         21 . A method of stabilizing and fusing the reshaped lamina after a laminoplasty comprising the steps of: 
 displacing the severed edge of a lamina at the junction of the lamina and facet, providing a spacing means with the edges of the said spacing means contoured to engage the lamina at one end and the facet at the other end, and    a fixation means attached to the said spacing means in the middle with curvatures at both ends in opposing directions allowing bone screw placement through one end of the said fixation means to the lamina and bone screw placement through the other end of the said fixation means to the facet    
     
     
         22 . A method of stabilizing the reshaped lamina after a laminoplasty comprising the steps of: 
 displacing the severed edge of the lamina at the junction of the lamina and facet, a fixation means comprising of a plate with appendages at either ends prior to the curvature of the longitudinal axis of the said fixation means to secure the lamina on one side and the facet on the other and maintain their repositioned shape along with fixation of the plate to the lamina and facet via bone fasteners    
     
     
         23 . A method of stabilizing and fusing the repositioned lamina after a laminoplasty comprising the steps of: 
 displacing the severed edges of lamina at the junction of the lamina and facet on both sides,    providing a spacing means with the edges of the said spacing means contoured to engage between the lamina and facet on both sides of the vertebra,    a fixation means with the said spacing means attached in the middle contoured to allow bone screw placement through one end of the said fixation means to the lamina and bone screw placement through the other end of the said fixation means to the facet on both sides of the vertebra    
     
     
         24 . A method of stabilizing and fusing the reshaped lamina after a laminoplasty comprising the steps of: 
 displacing both lamina through severed edges in the middle,    providing a spacing means with the edges of the spacing means contoured to engage the displaced lamina at both ends, and    a fixation means comprising of a plate with the said spacing means attached at the middle of the fixation means and the said fixation means comprising of a curvature at both ends of the longitudinal axis to secure the lamina and/or facets on both sides with bone fasteners    
     
     
         25 . A method of stabilizing the reshaped lamina after a laminoplasty comprising the steps of: 
 displacing both lamina through severed edges in the middle,    providing fixation means comprising of a plate with two appendages perpendicular to the longitudinal axis of the said fixation means spaced apart in the middle to engage the lamina on either side with the said fixation means also comprising of curvatures at both ends to secure the fixation means to the lamina and/or facets on both sides with bone fasteners