Orthopedic anchor assembly

Patent metadata

Field	Value
Publication number	US-9987058-B2
Application number	US-201615219332-A
Country	US
Kind code	B2
Filing date	Jul 26, 2016
Priority date	Feb 13, 2009
Publication date	Jun 5, 2018
Grant date	Jun 5, 2018

Abstract

In an exemplary embodiment, the present invention provides an anchor assembly that can be used for the fixation or fastening of orthopedic devices or instruments to bone tissue. In particular, the present invention preferably provides a variable angle or fixed angle anchor assembly that is able to securely connect the orthopedic device to bone tissue even when there is a variance in the angle and position of the assembly with respect to the device. Furthermore, in an exemplary embodiment, the present invention provides an anchor assembly having a locking mechanism that will quickly and easily lock the anchor assembly with respect to the orthopedic device.

First claim

What is claimed is:

1. An assembly comprising:
an orthopedic device having a cavity; and
an anchor assembly for fastening the orthopedic device to bone, the anchor assembly comprising:
a bone anchor comprising a head portion and an externally threaded shank portion integrally attached to and extending distally from the head portion along a central longitudinal axis, the head portion having a central opening surrounded by at least one resilient element, and the shank portion including a central longitudinal opening formed by an inner surface of the shank portion, wherein the inner surface includes a first recess and a second recess extending along a longitudinal edge and separated an axial distance from one another, said bone anchor is configured to be received in said cavity, such that said head portion is configured to directly engages an inner surface of said cavity; and
a locking mechanism having a head member and a non-threaded shaft member, the locking mechanism is received in the central longitudinal openings extending into the head and shank portions of said bone anchor, wherein the locking mechanism incudes an annular protrusion extending around a circumference of said non-threaded shaft member of the locking mechanism for matingly engaging with said recesses in said bone anchor, and includes an enclosed hollow portion extending in said non-threaded shaft for allowing at least a portion of said non-threaded shaft member to flex inwardly to allow the annular protrusion to slide axially in the central longitudinal opening in the shank portion;

wherein said assembly has an unlocked position and a locked position to lock said anchor assembly with the orthopedic device and prevent the at least one resilient element from flexing towards the central longitudinal axis, and
wherein in the unlocked position, the annular protrusion matingly engages with the first recess and the head member positioned above the head portion, and upon applying a downward force to slide the locking mechanism within the central openings of the bone anchor, the at least a portion of said non-threaded shaft member flexes inwardly disengaging the annular protrusion from the first recess and allowing the annular protrusion to matingly engages with the second recess and to seat the head member in the central opening of the head portion to prevent the at least one resilient element from flexing inwardly toward the central longitudinal axis such that the assembly is in the locked position.

2. The assembly of claim 1 , wherein the orthopedic device comprises a bone plate.

3. The assembly of claim 1 , wherein the head portion of the anchor includes texturing to provide friction surfaces to aid in locking the anchor assembly relative to the orthopedic device.

4. The assembly of claim 1 , wherein the shank portion of the anchor assembly comprises a shaft having a generally constant diameter.

5. The assembly of claim 1 , wherein the threaded shaft includes threads that decrease in diameter from a proximal end to a distal end of the shaft.

6. An assembly comprising:
an orthopedic device including a spherical cavity; and
an anchor assembly received in the cavity for fastening the orthopedic device to bone, the anchor assembly comprising;
a bone anchor comprising a head portion and an externally threaded shank portion integrally attached to and extending distally from the head portion along a central longitudinal axis, the head portion having a central opening surrounded by at least one resilient element, and the shank portion including a central longitudinal opening formed by an inner surface of the shank portion, wherein the inner surface of the shank portion includes a first recess and a second recess separated an axial distance from one another, said bone anchor is configured to be received in said cavity, such that said head portion is configured for directly engaging an inner surface of said cavity; and
a locking mechanism having a head member and a non-threaded shaft member, the locking mechanism is received in the central longitudinal openings extending into the head and shank portions of said bone anchor, wherein the locking mechanism includes an annular protrusion extending around a circumference of said non-threaded shaft member of the locking mechanism for matingly engaging with said recesses in said bone anchor, and includes an enclosed hollow portion extending in said non-threaded shaft for allowing at least a portion of said non-threaded shaft member to flex inwardly to allow the annular protrusion to slide axially in the central longitudinal opening in the shank portion;

wherein said assembly has an unlocked position and a locked position to lock said anchor assembly with the orthopedic device and prevent the at least one resilient element from flexing towards the central longitudinal axis, and
wherein in the unlocked position, the annular protrusion matingly engages with the first recess and the head member positioned above the head portion, and upon applying a downward force to slide the locking mechanism within the central openings of the bone anchor, the at least a portion of said non-threaded shaft member flexes inwardly disengaging the annular protrusion from the first recess and allowing the annular protrusion to matingly engages with the second recess and to seat the head member in the central opening of the head portion to prevent the at least one resilient element from flexing inwardly toward the central longitudinal axis such that the assembly is in the locked position.

7. The assembly of claim 6 , wherein the enclosed hollow portion is located between a proximal end and a distal end of the locking mechanism.

8. The assembly of claim 6 , wherein the annular protrusion is positioned along the shaft member.

9. The assembly of claim 6 , wherein the shank portion of the anchor assembly comprises a shaft having a generally constant diameter.

10. An assembly comprising:
an orthopedic device including a cavity; and
an anchor assembly received in the cavity for fastening the orthopedic device to bone, the anchor assembly comprising:
an anchor comprising a spherical head portion and an externally threaded shank portion integrally attached to and extending distally from the head portion along a central longitudinal axis, the head portion having a central opening surrounded by at least one resilient element, and the shank portion including a central longitudinal opening formed by an inner surface of the shank portion, wherein the inner surface of the shank portion includes a first recess and a second recess separated an axial distance from one another, said bone anchor is configured to be received in said cavity, such that said head portion is configured for directly engaging an inner surface of said cavity; and
a locking mechanism having a head member and a non-threaded shaft member, the locking mechanism received in the central longitudinal openings extending into the head and shank portions of said anchor, wherein the locking mechanism includes an annular protrusion extending around a circumference of said non-threaded shaft member of the locking mechanism for matingly engaging with said recesses in said bone anchor, and includes an enclosed hollow portion extending in said non-threaded shaft for allowing at least a portion of said non-threaded shaft member to flex inwardly to allow the annular protrusion to slide axially in the central longitudinal opening in the shank portion;

wherein said assembly has an unlocked position and a locked position to lock said anchor assembly with the orthopedic device and prevent the at lest one resilient element from flexing towards the central longitudinal axis, and
wherein in the unlocked positi

Assignees

• Globus Medical Inc
• Globus Medical Inc

Inventors

• Suh Sean
• Suh Jon

Classifications

• A61B17/8038 Primary

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

• A61B17/8052

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

• A61B2017/8655

  with special features for locking in the bone · CPC title

• A61B17/7001

  Screws or hooks combined with longitudinal elements which do not contact vertebrae (A61B17/7058 takes precedence) · CPC title

• A61B17/8605

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