Bone plates and associated screws

Patent metadata

Field	Value
Publication number	US-11039865-B2
Application number	US-201916289826-A
Country	US
Kind code	B2
Filing date	Mar 1, 2019
Priority date	Mar 2, 2018
Publication date	Jun 22, 2021
Grant date	Jun 22, 2021

Abstract

A bone plate includes a bone-contacting surface, an upper surface opposite the bone-contacting surface, and a hole having a circumference and extending from the upper surface to the bone-contacting surface. The hole includes a first portion having a plurality of substantially parallel lips, each lip extends around the circumference of the hole and defines a diameter of the hole. The diameters of the hole, as defined by the lips, decrease in a direction from the upper surface to a center of the hole and increase in a direction from the center of the hole toward the bone-contacting surface.

First claim

The invention claimed is:

1. A bone plate comprising:
a bone-contacting surface;
an upper surface, opposite the bone-contacting surface; and
a hole having a circumference and extending from the upper surface to the bone-contacting surface and including a first portion having a plurality of substantially parallel lips, each lip extending around the circumference of the hole and defining a diameter of the hole, the diameters of the hole as defined by the lips decreasing in a direction from the upper surface to a center of the hole and increasing in a direction from the center of the hole toward the bone-contacting surface.

2. The bone plate of claim 1 , wherein each lip extends along a plane substantially perpendicular to a central axis of the hole.

3. The bone plate of claim 1 , wherein the hole has a second portion extending from the upper surface to the first portion, and a third portion extending from the bone-contacting surface to the first portion, the second and third portions having substantially frusto-conically shaped cross-sections.

4. The bone plate of claim 3 , wherein the second and third portions are devoid of lips.

5. The bone plate of claim 1 , wherein the diameter of the hole is smallest at about the center of the hole.

6. The bone plate of claim 1 , wherein each lip has a rounded cross-section.

7. A bone plating system comprising:
a bone plate having a hole having a circumference and extending from an upper surface to a bone-contacting surface of the bone plate and including a first portion having a series of concentric lips, each lip extending around the circumference of the hole and defining a diameter of the hole, the diameters of the hole as defined by the lips decreasing in a direction from the upper surface to a center of the hole and increasing in a direction from the center of the hole toward the bone-contacting surface; and
a locking screw receivable within the hole of the plate in polyaxial orientations, the locking screw having a threaded head and having a frusto-conical profile, the threads of the head configured to engage the lips of the hole to lock the locking screw to the plate.

8. The bone plating system of claim 7 , wherein the plate is formed of a first material and the locking screw is formed of a second material harder than the first material.

9. The bone plating system of claim 7 , wherein the lips of the hole are elastically deformable by the threads of the locking screw to secure the locking screw to the plate.

10. The bone plating system of claim 7 , wherein the head of the locking screw has a double-lead thread.

11. The bone plating system of claim 7 , further comprising a compression screw receivable within the hole.

12. The bone plating system of claim 11 , wherein the bone plate has a second portion extending from the upper surface to the first portion, and the compression screw has a head sized and shaped to rest in the second portion of the hole without extending into the first portion of the hole.

13. The bone plating system of claim 7 , the locking screw is moveable in a 30 degree cone around a central axis of the hole.

14. The bone plating system of claim 7 , wherein adjacent threads of the head of the locking screw define a first pitch, and adjacent lips of the hole define a second pitch, the first pitch being substantially the same as the second pitch.

Assignees

• Stryker European Operations Ltd

Inventors

• Singh Manoj Kumar
• Mannanal Subash K
• Dominik Robert
• Sylvestre Pierre-Luc
• Wiederkehr Andreas

Classifications

• A61B17/8052

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

• A61B17/8057 Primary

  the interlocking form comprising a thread · CPC title

• A61B17/8605

  Heads, i.e. proximal ends projecting from bone · CPC title

• A61B17/8038

  the additional component being inserted in the screw head · CPC title

• A61B17/8047 Primary

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