Bone plate

Patent metadata

Field	Value
Publication number	US-10342586-B2
Application number	US-201615048204-A
Country	US
Kind code	B2
Filing date	Feb 19, 2016
Priority date	Aug 26, 2003
Publication date	Jul 9, 2019
Grant date	Jul 9, 2019

Abstract

A bone plate has an underside on the side of the bone, an upper side and a plurality of holes in the plate connecting the underside with the upper side, with a central hole axis. At least one of these holes in the plate has an internal jacket surface that tapers towards the underside, while the internal jacket surface has N≥3 recesses which extend radially away from the axis of the hole.

First claim

What is claimed:

1. A bone plate system comprising:
a bone plate including a lower surface configured to face bone, an upper surface opposite the lower surface, and a threaded inner surface that defines a hole that extends along a central hole axis from the upper surface to the lower surface, the lower surface defining a lower opening of the hole, and the upper surface defining an upper opening of the hole; and
a bone screw that is elongate along a central screw axis, the bone screw including a threaded head,
wherein the threaded head is configured to engage with the bone plate such that: 1) the central screw axis defines a select angle with respect to the central hole axis, the angle being selected from a plurality of different angles defined by the central screw axis and the central hole axis, wherein the plurality of different angles define angles at which the threaded head is configured to threadedly mate with the threaded inner surface, and 2) the threaded head threadedly mates with the threaded inner surface, and
wherein when the threaded head threadedly mates with the bone plate in the hole such that the central screw axis is not angled with respect to the central hole axis, the threaded inner surface and the threaded head cooperate to define a gap that extends along a straight path from the upper opening to the lower opening without intersecting either of the bone plate and the bone screw.

2. The bone plate system of claim 1 , wherein the threaded head is configured to engage with the bone plate such that the threaded inner surface and the threaded head cooperate to define a plurality of gaps that each extend along a straight path from the upper opening to the lower opening without intersecting either of the bone plate and the bone screw.

3. The bone plate system of claim 2 , wherein each of the plurality of gaps are equidistantly spaced about the central hole axis.

4. The bone plate system of claim 2 , wherein the threaded inner surface and the threaded head threadedly mate with each other between adjacent ones of the plurality of gaps.

5. The bone plate system of claim 1 , wherein the upper opening defines a first cross-sectional dimension measured in a first plane that is perpendicular to the central hole axis, the lower opening defines a second cross-sectional dimension measured in a second plane that is perpendicular to the central hole axis, and the first cross-sectional dimension is greater than the second cross-sectional dimension.

6. A bone plate comprising:
a lower surface configured to face a bone;
an upper surface facing opposite the lower surface along a transverse direction;
an inner surface that extends from the upper surface to the lower surface, wherein the inner surface defines at least one hole that extends from the upper surface to the lower surface along a central axis, wherein the inner surface defines a plurality of regions and a recess that extends through the upper surface of the bone plate along the transverse direction at a location circumferentially between the regions; and
a thread that projects from the inner surface toward the central axis, such that the thread is configured to mate with a threaded head of a bone screw as the bone fixation element is rotationally inserted through the at least one hole at a user selected angle within a permitted range of angles relative to the central axis whereby the thread is configured to mate with the threaded head of the bone screw,
wherein the recess extends in a direction radially away from the central axis with respect to the regions, such that the inner surface at the recess is spaced from the central axis a first distance measured along a first direction perpendicular to the central axis, and the inner surface at the regions is spaced from the central axis less than the first distance as measured along a second direction perpendicular to the central axis.

7. The bone plate of claim 6 , wherein the first direction and the second direction are coplanar with each other in a plane that is perpendicular to the central axis.

8. The bone plate of claim 6 , wherein the recess extends from the upper surface to the lower surface.

9. The bone plate of claim 6 , wherein the recess is one of a plurality of recesses defined by the inner surface.

10. The bone plate of claim 9 , wherein each of the plurality of recesses defines a shape that is a portion of a cylinder with a respective center.

11. The bone plate of claim 10 , wherein the centers are equidistantly spaced about the central axis.

12. The bone plate system of claim 1 , wherein when the threaded head threadedly mates with the bone plate in the hole such that the central screw axis is coincident with the central hole axis, the threaded inner surface and the threaded head cooperate to define a gap that extends along a straight path from the upper opening to the lower opening without intersecting either of the bone plate and the bone screw.

Assignees

• Depuy Synthes Products Inc

Inventors

• Schneider Rolf

Classifications

• A61B17/80 Primary

  Cortical plates {, i.e. bone plates; Instruments for holding or positioning cortical plates, or for compressing bones attached to cortical plates} · CPC title

• A61L27/18

  obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds · CPC title

• A61L2430/02

  for reconstruction of bones; weight-bearing implants · CPC title

• A61B17/8033 Primary

  having indirect contact with screw heads, or having contact with screw heads maintained with the aid of additional components, e.g. nuts, wedges or head covers · CPC title

• A61B17/8057

  the interlocking form comprising a thread · CPC title