MINIMAL ACCESS OCCIPITAL PLATE

• US 20100324557A1
• Filed: 06/23/2009
• Published: 12/23/2010
• Est. Priority Date: 06/23/2009
• Status: Active Grant

• Current Assignee: Aesculap Implant Systems LLC (Sartorius AG)
• Original Assignee: Aesculap Implant Systems LLC (Sartorius AG)
• Inventors: Cheema, Naveed, Apfelbaum, Ron, Geisler, Fred, Khoo, Larry
• Granted Patent: US 8,348,981 B2
• Time in Patent Office: Days
• US Class Current: 606/70
• CPC Class Codes: A61B 17/7055 connected to sacrum, pelvis or skull

Abstract

A bone plate for securing a spinal fixation element to bone includes a base portion having a top face, a rod receiving portion and a bone anchor receiving portion. The bone anchor receiving portion includes a plurality of angled holes for receiving bone screws. At least one of the screw holes is oriented at an acute angle relative to the top face of the plate.

Claims

1. A bone plate for securing a spinal fixation element to bone, the bone plate comprising:

a base portion having a top face;

a rod receiving portion extending from the base portion, the rod receiving portion including a channel for receiving a spinal fixation element; and

a bone anchor receiving portion comprising a plurality of raised projections, each raised projection projecting from the top face of the plate and forming a hole for receiving a bone anchor into the raised projection and through the base portion, each hole having a hole axis extending at an acute angle with respect to the top face.

2. The bone plate of claim 1, wherein the axes of all of the holes converge at a single point above the top face of the plate.

3. The bone plate of claim 1, wherein the bone anchor receiving portion is characterized by an X-Y plane, a Y-Z plane and an X-Z plane, and at least one hole axis is oriented at an acute angle with respect to the top face in a plane parallel to one of the X-Y plane, Y-Z plane and X-Z plane.

4. The bone plate of claim 3, wherein the holes comprise a superior hole, an inferior hole, a first lateral hole and a second lateral hole.

5. The bone plate of claim 4 wherein the axis of the superior hole extends at an acute angle Θ

_XZ relative to the top face, and the inferior hole extends at an acute angle Θ

_XZ relative to the top face, wherein angle Θ

_XZ for the superior hole is greater than Θ

_XZ for the inferior hole.

6. The bone plate of claim 5, wherein angle Θ

_XZ for the superior hole is between about 55 degrees and about 65 degrees, and angle Θ

_XZ for the inferior hole is between about 47 degrees and about 57 degrees.

7. The bone plate of claim 4, wherein the axis of the first lateral hole extends at an acute angle Θ

_XZ relative to the top face and an angle Θ

_YZ relative to the top face, wherein angle Θ

_YZ for the first lateral hole is greater than angle Θ

_XZ for the first lateral hole.

8. The bone plate of claim 7, wherein the axis of the second lateral hole extends at an acute angle Θ

_XZ relative to the top face and an angle Θ

_YZ relative to the top face, wherein angle Θ

_YZ for the second lateral hole is greater than angle Θ

_XZ for the second lateral hole.

9. The bone plate of claim 8, wherein angles Θ

_XZ for the first and second lateral holes are between about 52 degrees and about 62 degrees, and angles Θ

_YZ for the first and second lateral holes are between about between about 73 degrees and about 83 degrees, the first and second lateral holes being symmetrically arranged on the top face of the plate.

10. A bone plate for securing a spinal fixation element to bone, the bone plate comprising:

a base portion having a top face;

a rod receiving portion for receiving a spinal fixation element; and

a bone anchor receiving portion comprising a plurality of raised projections, each raised projection projecting from the top face of the plate and forming a hole for receiving a bone anchor into the raised projection and through the base portion, each hole having a hole axis extending at an acute angle with respect to the top face, the axes of the holes converging toward one another as they extend away from the top face of the plate.

11. The bone plate of claim 10, wherein the axes of all of the holes converge at a single point above the top face of the plate.

12. The bone plate of claim 10, wherein the bone anchor receiving portion is characterized by an X-Y plane, a Y-Z plane and an X-Z plane, and at least one hole axis is oriented at an acute angle with respect to the top face in a plane parallel to one of the X-Y plane, Y-Z plane and X-Z plane.

13. The bone plate of claim 10, wherein the holes comprise a superior hole, an inferior hole, a first lateral hole and a second lateral hole.

14. The bone plate of claim 13 wherein the axis of the superior hole extends at an acute angle Θ

_XZ relative to the top face, and the inferior hole extends at an acute angle Θ

_XZ relative to the top face, wherein angle Θ

_XZ for the superior hole is greater than Θ

_XZ for the inferior hole.

15. The bone plate of claim 14, wherein angle Θ

_XZ for the superior hole is between about 55 degrees and about 65 degrees, and angle Θ

_XZ for the inferior hole is between about 47 degrees and about 57 degrees.

16. The bone plate of claim 13, wherein the axis of the first lateral hole extends at an acute angle Θ

_XZ relative to the top face and an angle Θ

_YZ relative to the top face, wherein angle Θ

_YZ for the first lateral hole is greater than angle Θ

_XZ for the first lateral hole.

17. The bone plate of claim 16, wherein the axis of the second lateral hole extends at an acute angle Θ

_XZ relative to the top face and an angle Θ

_YZ relative to the top face, wherein angle Θ

_YZ for the second lateral hole is greater than angle Θ

_XZ for the second lateral hole.

18. The bone plate of claim 17, wherein angles Θ

_XZ for the first and second lateral holes are between about 52 degrees and about 62 degrees, and angles Θ

_YZ for the first and second lateral holes are between about between about 73 degrees and about 83 degrees.