Patent ID: 11883082
Assignee: nan
Field: Medical technology (Instruments)
Classification: CPC A | IPC A

Claim 8:
9. A spinal bone anchor attachment device adapted for use with a pedicle screw, comprising:
an elongated multi-laterally split partial base portion split along, and adapted for insertion of the pedicle screw along, a central longitudinal axis of said partial base portion;
an elongated multi-laterally split partial shaft portion split along, and adapted for insertion of the pedicle screw along, a central longitudinal axis of said partial shaft portion, said partial shaft portion being split into at least a first side and a second side;
an elongated concave inner surface within said partial shaft portion adapted for engaging the pedicle screw;
a tip connecting the first side and the second side, said tip being positioned opposite said partial base portion; and
a plurality of courses of bone engaging ridges extending outwardly from and along at least a portion of the length of said partial shaft portion, wherein said partial base portion, said partial shaft portion, and said tip, are adapted to cause the anchor attachment device to expand apart upon subsequent installation of the pedicle screw to better engage an inner cortical bone portion of the pedicle, and thereby enhance sturdiness of the vertebral stabilization procedure, wherein said tip further comprises a point at a leading end of said tip, a first plurality of faceted interior surfaces, each of said first plurality of faceted surfaces extending partially from corresponding ones of each the first side and the second side of said partial shaft and partially from said tip towards said point, and a second plurality of differently faceted interior surfaces which are interconnected with but non-coplanar with said first plurality of faceted surfaces, each of said second plurality of faceted surfaces extending from corresponding ones of said first plurality of faceted surfaces to said partial shaft portion.