Closure for open-headed medical implant
OwnerRoger P. Jacksoninventor
Life of this patent
Estimating the term…
Abstract
A closure for an open headed medical implant, such as a bone screw. The closure having a cylindrical body having an axis of rotation and also having a radially outer surface with a thread or other guide and advancement structure thereon. The body having a plurality of apertures that open onto a top surface of the body and that are parallel to but spaced from the axis of rotation. The closure also has a break-off head centrally attached by a neck to the top surface of the body.
Claims9
1-28. (canceled)
A closure for operably closing a top portion of a rod receiving channel between two arms of a bone anchor, each of the two arms having an internal threaded surface, the closure comprising:
- a body comprising a closed ring with a threaded radially outer surface, the body further comprising a top surface, a bottom surface, a threaded central bore extending between the top surface and the bottom surface about a central axis, and a plurality of spaced-apart drive structures formed within the top surface and extending partially down into the body to solely threadingly drive the body between the threaded arms of the bone anchor while the threaded radially outer surface of the body engages the internal threaded surface of each of the two arms;
- and
- a set screw with a radially outer surface that is continuously threaded from near a top surface to near a bottom surface thereof, the bottom surface being closed with a substantially flat surface portion, and wherein the set screw engages and locks a rod positioned within the rod receiving channel while the threaded radially outer surface of the set screw engages the threaded central bore of the body.
A closure for operably closing a top portion of a rod receiving channel between two arms of a bone anchor, each of the two arms having an internal threaded surface, the closure comprising:
- a body comprising a closed ring with a threaded radially outer surface, a top surface, a bottom surface, a central bore that is threaded extending between the top surface and the bottom surface about a central axis, and a plurality of equally spaced-apart drive structures formed within the top surface and extending partially down into the body to solely threadingly drive the body between the two threaded arms of the bone anchor while the threaded radially outer surface of the body engages the internal threaded surface of each of the two arms.
Dependencies are inferred from the claim text.