Hybrid spinal plates

Patent metadata

Field	Value
Publication number	US-11026725-B2
Application number	US-201715592357-A
Country	US
Kind code	B2
Filing date	May 11, 2017
Priority date	Dec 8, 2004
Publication date	Jun 8, 2021
Grant date	Jun 8, 2021

Abstract

Various spinal plating systems for use in treating spinal pathologies are provided. In certain exemplary embodiments, the spinal plating systems can be configured to allow a surgeon to select a bone screw construct having a particular range of motion for attaching a spinal plate to bone as needed based on the intended use. In one exemplary embodiment, the spinal plating system includes a first bone screw that is polyaxially movable relative to the spinal plate, and a second bone screw that has a range of motion that is substantially limited to a single plane.

First claim

The invention claimed is:

1. A spinal plating system, comprising:
a spinal plate having a thru-bore extending from a non-bone-contacting surface of the spinal plate to a bone-contacting surface without threading, the thru-bore including a spherical proximal portion and an oblong distal portion and being configured to interchangeably receive variable angle bone screws and limited angle bone screws, the oblong distal portion defining a major diameter and a minor diameter, with the major diameter being larger than the minor diameter, wherein the thru-bore defines a central axis, the spherical proximal portion is symmetric to the central axis, and the oblong distal portion defines a first portion extending away from the central axis in a first direction and a second portion extending away from the central axis in a second direction, the first portion being opposite to the second portion with respect to the central axis and the first and second portions defining the major diameter of the oblong distal portion;
a variable angle bone screw having a head with a spherical proximal portion and a cylindrical distal portion and a shank extending therefrom, the variable angle bone screw being polyaxially movable with respect to the spinal plate when the variable angle bone screw is seated in the thru-bore; and
a limited angle bone screw having a head with a spherical proximal portion and a cylindrical distal portion and a shank extending therefrom, the limited angle bone screw being movable only in a single plane with respect to the spinal plate when the limited angle bone screw is seated in the thru-bore,
wherein the cylindrical distal portion of the variable angle bone screw defines a first diameter that is greater than or equal to a maximum diameter of the shank of the variable angle bone screw, and
wherein the cylindrical distal portion of the limited angle bone screw defines a second diameter that is greater than the first diameter and less than or equal to the minor diameter.

2. The system of claim 1 , wherein the thru-bore permits angulation of the variable angle bone screw up to an angle in the range of 10 and 20 degrees in any direction with respect to the central axis of the thru-bore.

3. The system of claim 1 , wherein the thru-bore permits angulation of the limited angle bone screw only up to an angle less than or equal to 5 degrees in the first direction and up to an angle of less than or equal to 5 degrees in the second, opposite direction with respect to the central axis of the thru-bore.

4. A spinal plating system, comprising:
a spinal plate comprising:
a concave distal bone-engaging surface;
a proximal surface opposite to the distal bone-engaging surface; and
at least one thru-bore extending from the proximal surface of the spinal plate to concave distal bone-engaging surface without threading, the thru-bore having a proximal inner wall encircling the thru-bore that is symmetrical about a central axis of the thru-bore and a distal inner wall encircling the thru-bore that is asymmetrical about the central axis, and

first and second bone engaging fasteners, each fastener having a shank portion and a head formed thereon, the head including a spherical proximal portion and a cylindrical distal portion with the shank extending therefrom,
wherein the proximal inner wall of the thru-bore is spherical in shape and configured to interchangeably receive the heads of the first and second bone engaging fasteners, and
wherein the distal inner wall of the thru-bore is oblong in shape and configured to allow the shank portion of the first bone engaging fastener to move polyaxially with respect to the spinal plate and configured to restrict the shank portion of the second bone engaging fastener to movement in a single plane with respect to the spinal plate, the distal inner wall defining a major diameter and a minor diameter, with the major diameter being larger than the minor diameter,
wherein the distal inner wall defines a first portion extending away from the central axis in a first direction and a second portion extending away from the central axis in a second direction, the first portion being opposite to the second portion with respect to the central axis and the first and second portions defining the major diameter of the distal inner wall,
wherein the cylindrical distal portion of the first bone engaging fastener defines a first diameter that is greater than or equal to a maximum diameter of the shank of the first bone engaging fastener, and
wherein the cylindrical distal portion of the second bone engaging fastener defines a second diameter that is greater than the first diameter and less than or equal to the minor diameter.

5. The system of claim 4 , wherein the thru-bore permits angulation of the first bone engaging fastener up to an angle in the range of 10 to 20 degrees in any direction with respect to the central axis of the thru-bore.

6. The system of claim 4 , wherein the thru-bore permits angulation of the second bone engaging fastener only up to an angle of less than or equal to 5 degrees in the first direction and up to an angle of less than or equal to 5 degrees in the second, opposite direction with respect to the central axis of the thru-bore.

7. The system of claim 4 , wherein the at least one thru-bore comprises a plurality of thru-bores.

8. The system of claim 4 , wherein the plate is configured to span a plurality of vertebral levels.

Assignees

• Depuy Synthes Products Inc

Inventors

• Konieczynski David D
• Jacene Michael
• Gorhan Michael
• Kolb Eric D

Classifications

• A61B17/8042

  the additional component being a cover over the screw head · CPC title

• A61B17/8047

  wherein the additional element surrounds the screw head in the plate hole (A61B17/8052 takes precedence) · CPC title

• A61B17/8052

  immobilised relative to screws by interlocking form of the heads and plate holes, e.g. conical or threaded · CPC title

• A61B17/7059 Primary

  Cortical plates (A61B17/7007, A61B17/7058 take precedence) · CPC title