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US 2003/0120277 A1Published application
Cannulated internally threaded bone screw with aperatured insert
OwnerJ. Lee Bergerinventor
Life of this patent
Estimating the term…
Abstract
A bone screw assembly comprising: a bone screw with an externally threaded shank having a head integrally formed at the proximal end and defining a cannula extending through the head and shank. An internal thread formed on the surface defining the inner cannula to receive an anchor bolt having a threaded portion, and a head defining plurality of throughgoing wire receiving holes.
Claims20
A cannulated torque receiving bone screw assembly comprising:
- aa screw with an elongated cylindrical shank defining a throughgoing cylindrical bore and having a proximal end, a head integrally formed at the proximal end, a distal end, and an outer surface, an engagement structure defined by said head shaped to receive and rotatably engage a driver having a shape complimentary to the shape of the engagement structure;
- an external thread is formed on said shank outer surface and an internal thread is formed on a surface defining an inner cylindrical bore axially aligned with said shank and a threaded anchor bolt is mounted to said screw adjacent said screw head, said anchor bolt defining at least one throughgoing bore therein transverse the axis of said inner cylindrical bore.
A cannulated torque receiving bone screw assembly comprising:
- a screw with an elongated cylindrical shank defining a throughgoing cylindrical bore and having a proximal end, a head integrally formed at the proximal end, a distal end, and an outer surface, an engagement structure defined by said head is shaped to receive and rotatably engage a driver having a shape complimentary to the shape of the engagement structure;
- an external thread is formed on said shank outer surface and an internal thread is formed on a surface defining an inner cylindrical bore and a threaded anchor bolt mounted to said screw adjacent said screw head, said anchor bolt defining a plurality of throughgoing bores;
- said anchor bolt comprising a threaded shank adapted to be threadedly mounted in said internal thread of said inner cylindrical bore and a T-shaped head, said head defining a plurality of aligned throughgoing bores.
A cannulated torque receiving bone screw assembly comprising:
- a screw with an elongated cylindrical shank defining a throughgoing cylindrical bore and having a proximal end, a head integrally formed at the proximal end, a distal end, and an outer surface, an engagement structure defined by said head is shaped to receive and rotatably engage a driver having a shape complimentary to the shape of the engagement structure;
- an external thread is formed on said shank outer surface and an internal thread is formed on a surface defining an inner cylindrical bore and a threaded anchor bolt selectively threadably mounted to said screw adjacent said screw head, said anchor bolt defining a plurality of throughgoing bores;
- said anchor bolt comprising a threaded shank with a planar distal end, the shank being adapted to be threadedly mounted in said internal thread of said inner cylindrical bore, a T-shaped head integrally formed with said shank, said T-shaped head comprising a cylindrical stem which is axially aligned with said shank and a cross piece mounted on the proximal end of said cylindrical stem, said cross piece defining a plurality of aligned throughgoing bores which run at an angle to the central axis of said anchor bolt shank.
Dependencies are inferred from the claim text.