Patent ID: 8211156
Filing Date: 2012-07-03
Classification: A61B,Y10S

Abstract:
1. A bone screw assembly with an anchoring apparatus and an injection apparatus, comprising: a screw shaft having a first end and a second end; an enlarged bulb, said enlarged bulb positioned in an intermediate region of said screw shaft between said first end of said screw shaft and said second end of said screw shaft, said enlarged bulb having a greater diameter than the remainder of said screw shaft, said enlarge bulb fixed in position between said first end and said second end of said screw shaft; a first half of said screw shaft between said first end of said screw shaft and said enlarged bulb; a second half of said screw shaft between said second end of said screw shaft and said enlarged bulb; a first set of helical grooves on the surface of said first half of said screw shaft, said first set of helical grooves located between said first end of said screw shaft and said enlarged bulb; an anchor engagement structure on the surface of said second half of said screw shaft, said anchor engagement structure located between said second end of said screw shaft and said enlarged bulb; a hollow axial core within said screw shaft; said hollow axial core of said screw shaft having at least one opening in said first end of said screw shaft, and said hollow axial core of said screw shaft having an opening in said second end of said screw shaft; an expandable collar with a first end and a second end, said expandable collar having a tubular structure, said expandable collar fitting concentrically over said screw shaft, said first end of said expandable collar having radially expandable portion, said first end of said expandable collar capable of expansion in multiple radial directions with application of outward radial force from the center axis of said expandable collar, said second end of said expandable collar having a tubular structure, said expandable collar configured to expand upon contact with said enlarged bulb when said expandable collar is moved toward said enlarged bulb, and configured to penetrate surrounding bone tissue upon radial expansion; a bushing with a first end and a second end, said first end of said bushing having a tubular structure, said second end of said bushing having a tubular structure, said bushing fitting concentrically over said screw shaft; a tightening nut having a first side and a second side, a tunnel through the body of said tightening nut, said tunnel opening on said first side and said second side of said tightening nut, said tunnel shaped to surround said second half of said screw shaft, said interior surface of said tunnel having a structure capable of engaging said anchor engagement structure of said second half of said screw shaft and by pushing against said bushing, pushing said expandable collar toward said enlarged bulb, said first side of said tightening nut having a bushing engagement face, said second side of said tightening nut having an adjustment and attachment interface, said adjustment and attachment interface having a structure for grasping and adjustment of tightening nut, and said adjustment and attachment interface having regions for attaching additional hardware to said bone screw assembly; and said bone screw assembly assembled with said expandable collar oriented concentrically around said second half of said screw shaft with said first end of said expandable collar adjacent to said enlarged bulb and said second end of said expandable collar positioned in an intermediate region between said enlarged bulb and said second end of said screw shaft, said bushing oriented concentrically around said screw shaft with said first end of said bushing adjacent to said second end of said expandable collar and said second end of said bushing proximal to said second end of said screw shaft, said tunnel of said tightening nut surrounding a portion of said second half of said screw shaft, said first side of said tightening nut positioned adjacent to said second end of said bushing, said adjustment and attachment interface of said tightening nut adjacent to said second end of said screw shaft.