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US 6,821,278 B2Granted
Bone plate
AssigneesSynthes AG Chur, Synthes GmbH
InventorsRobert Frigg, Robert Ferus
Life of this patent
Estimating the term…
Abstract
A bone plate includes an upper surface, a bone-contacting surface, and a plurality of holes extending through the upper and bone-contacting surfaces for receiving bone screws. At least one of the holes includes a protrusion disposed on the bone-contacting surface and at least partially surrounding the hole. The bone plate may define a nominal plate thickness in regions between holes, and the protrusion may define an increased plate thickness that is greater than the nominal plate thickness. A bone plate system including a plurality of bone screws is also disclosed.
Claims25
A bone plate comprising:
- an upper surface;
- a lower surface;
- and
- a plurality of holes extending through the upper surface and the lower surfaces, the upper surface of the bone plate including a first upper portion and at least one second tapered portion, the at least one second tapered portion located at at least one of the holes and sloping in a direction toward the lower surface such that a gap is formed between the first upper portion of the upper surface of the bone plate and an upper portion of a bone screw securable in the at least one of the holes;
- wherein said at least one of the holes includes a protrusion disposed on the lower surface and at least partially surrounding the hole, and internal threads tapering radially inward in a direction from the upper surface to the lower surface, said sloping direction of said at least one second tapered portion intersects at a non-zero angle with said direction of the tapering internal threads, and the bone plate defines a nominal plate thickness in regions between the holes, and the protrusion defines an increased plate thickness that is about 1.5 to 2 times greater than the nominal plate thickness.
2 more elements
A bone plate comprising:
- an upper surface having a first upper portion;
- a lower surface;
- and
- a plurality of threaded holes extending through the upper and lower surfaces, the threaded holes having threads tapering radially inward in a direction from the upper surface to the lower surface for engaging threaded screw-heads;
- and
- a tapered flange formed on the lower surface and at least partially around one of the holes, the tapered flange defining a corresponding tapered portion in the upper surface of the bone plate, the tapered portion sloping in a direction toward the lower surface, such that a gap is formed between the first upper portion of the upper surface of the bone plate and an upper portion of a bone screw secured in the hole said sloping direction intersects at a non-zero angle with said direction of the tapering threads of said one of the holes;
- wherein the bone plate defines a nominal plate thickness in regions between the holes, and the tapered flange defines an increased plate thickness that is about 1.5 to 2 times greater than the nominal plate thickness.
4 more elements
A bone plate system comprising:
- a bone plate including:
- an upper surface;
- a lower surface;
- a plurality of tapered holes tapering radially inward in a direction from the upper and lower surfaces, the holes having an internal thread disposed thereon, and the upper surface of the bone plate including a first upper portion and at least one second tapered portion, the at least one second tapered portion located at at least one of the holes and sloping in a direction toward the lower surface such that a gap is formed between the first upper portion of the upper surface of the bone plate and an upper portion of a bone screw securable in the at least one of the holes, said sloping direction of said at least one second tapered portion intersects at a non-zero angle with said direction of said at least one of the holes;
- and
- an annular protrusion formed at least partially around at least one of the holes and extending from the lower surface, the protrusion being substantially concentric with the hole;
- wherein the bone plate defines a nominal plate thickness in regions between the holes, and the protrusion defines an increased plate thickness that is about 1.5 to 2 times greater than the nominal plate thickness;
- and
- a bone screw having a tapered screw-head with an external thread disposed thereon for engaging the internal thread;
- wherein the internal thread defines an internal thread taper angle, and the external thread defines an external thread taper angle that is substantially equal to the internal thread taper angle.
7 more elements
A bone plate comprising:
- an upper surface;
- a lower surface with a protrusion formed on the lower surface and a threaded hole tapering radially inward through the protrusion in a direction from the upper surface to the lower surface;
- wherein the upper surface of the bone plate includes a first upper portion and at least one second tapered portion, located at the threaded hole, sloping in a direction toward the lower surface, such that a gap is formed between the first upper portion of the upper surface of the bone plate and an upper portion of a bone screw secured in the hole said sloping direction of said at least one second tapered portion intersects at a non-zero angle with said direction of said tapering threaded hole;
- and
- wherein the bone plate defines a nominal plate thickness in regions distal to the threaded hole, and the protrusion defines an increased plate thickness that is about 1.5 to 2 times greater than the nominal plate thickness.
2 more elements
A bone plate comprising:
- an upper surface having a first upper portion and at least one second tapered portion;
- a lower surface having a protrusion formed thereon;
- a tapered hole tapering radially inward through the protrusion in a direction from the upper surface to the lower surface, the tapered hole having internal threads for engaging a head of a bone screw;
- wherein the at least one second tapered portion, located at the tapered hole, slopes in a direction toward the lower surface, such that a gap is formed between the first upper portion of the upper surface of the bone plate and an upper portion of a bone screw secured in the hole, said sloping direction of said at least one second tapered portion intersects at a non-zero angle with said direction of said tapering threaded hole;
- and
- wherein the bone plate defines a nominal plate thickness in regions distal to the tapered hole, and the protrusion defines an increased plate thickness that is about 1.5 to 2 times greater than the nominal plate thickness.
3 more elements
Dependencies are inferred from the claim text.