Bone plate

• US 20060004361A1
• Filed: 06/21/2004
• Published: 01/05/2006
• Est. Priority Date: 06/21/2004
• Status: Active Grant

• Current Assignee: Synthes USA LLC (Johnson & Johnson)
• Original Assignee: Synthes USA LLC (Johnson & Johnson)
• Inventors: Kim, Henry, Grady, Mark P. Jr., Hayeck, Garry, Haag, Rene
• Granted Patent: US 7,229,445 B2
• Time in Patent Office: Days
• US Class Current: 606/282
• CPC Class Codes: A61B 17/74 Devices for the head or neck or trochanter of the femur trochanteric devices connected to the proximal part of an endoprosthetic femoral shaft A61F2/30739; endoprosthetic internal fixation devices for the head or neck of the femur A61F2/3601
• CPC Class Codes: A61B 17/8014 the extension or compression force being caused by interaction of the plate hole and the screws
• CPC Class Codes: A61B 17/8057 the interlocking form comprising a thread
• CPC Class Codes: A61B 17/809 with bone-penetrating elements, e.g. blades or prongs bone staples A61B17/0642; intramedullary nails with a plate at an end A61B17/7233

Abstract

A bone plate for fixation of a fractured bone comprises a first portion having a first longitudinal axis, an upper surface and a lower surface and a second portion having a second longitudinal axis, an upper surface and a lower surface. The second portion is angled with respect to the first portion such that the lower surface of the first portion and the lower surface of the second portion define an included angle therebetween. The first portion has at least one hole for receiving a bone anchor having a shaft. The hole has a first hole portion defining a first central axis substantially perpendicular to the lower surface and the first hole portion is configured to receive the bone anchor. The hole includes a second hole portion overlapping and in communication with the first hole portion from upper to lower surface defining a second central axis substantially angled with respect to the first central axis, the second hole portion is configured to receive the bone anchor such that the shaft is substantially angled with respect to the second portion of the bone plate so as to form a truss.

Claims

1. A bone plate for fixation of a fractured bone, the bone plate comprising:

a first portion having a first longitudinal axis, an upper surface and a lower surface;

a second portion having a second longitudinal axis, an upper surface and a lower surface, the second portion being angled with respect to the first portion such that the lower surface of the first portion and the lower surface of the second portion define a first included angle therebetween;

the first portion having at least one hole for receiving a bone anchor having a shaft, the hole having a first hole portion defining a first central axis substantially perpendicular to the lower surface, the first hole portion being configured to receive the bone anchor; and

wherein the hole includes a second hole portion overlapping and in communication with the first hole portion from upper to lower surface and defining a second central axis substantially angled with respect to the first central axis, the second hole portion being configured to receive the bone anchor such that the shaft is not substantially perpendicular with respect to the first portion of the bone plate.

2. The bone plate of claim 1, wherein the second central axis is angled so as to substantially intersect the second longitudinal axis at a point below the lower surface of the first portion of the bone plate.

3. The bone plate of claim 1, wherein the first longitudinal axis defines a plane that bisects the first portion of the bone plate and wherein further the second central axis intersects the plane at a single point.

4. The bone plate of claim 1, wherein the second central axis is angled with respect to the first central axis, the angle between the second central axis and the first central axis ranging from about 10°

to about 35°

.

5. The bone plate of claim 1 wherein the second hole portion is configured to receive the bone anchor such that the shaft is substantially at a fixed angle with respect to the second portion of the bone plate.

6. The bone plate of claim 5, wherein at least a portion of the second hole portion is threaded for threadedly engaging a threaded head of a bone anchor, the second hole being configured to fix the bone anchor at an angle relative to the second portion of the bone plate.

7. The bone plate of claim 6 wherein the threaded portion of the second hole portion extends along the periphery relative to the second central axis at an angle from about 190°

to about 280°

.

8. The bone plate of claim 6 further comprising a bone anchor having a threaded head received in the second hole portion, the head threadedly engaged with the threaded portion of the second hole portion, the bone anchor being configured and dimensioned so as to contact at least a portion of the second portion of the bone plate.

9. The bone plate of claim 1, wherein the second portion of the bone plate is a blade having a proximal end adjacent the first portion of the bone plate and a distal end, the blade configured and adapted to be inserted within the interior of the fractured bone.

10. The bone plate of claim 9, wherein the upper surface of the blade includes at least one channel.

11. The bone plate of claim 9, wherein the blade includes a bore extending from proximal to distal end, the bore being dimensioned and configured to receive a guide wire.

12. The bone plate of claim 1 wherein the first included angle ranges from about 75°

to about 110°

.

13. The bone plate of claim 1 wherein the first hole portion is smooth and is elongated in the direction of the first longitudinal axis.

14. The bone plate of claim 5 wherein at least a portion of the second hole portion conically tapers from the upper surface to the lower surface.

15. The bone plate of claim 1, wherein the first hole portion of the at least one hole is elongated in the direction of the first longitudinal axis and includes a first substantially spherical counterbore along the upper surface and a second counterbore along the lower surface of the bone plate, the first hole portion being configured to receive a bone anchor having a spherical head and the first counterbore being configured to engage the spherical head for compression or distraction of the fracture.

16. A bone plate for fixation of a fractured bone, the bone plate comprising:

an elongated plate portion having a first longitudinal axis, an upper surface and a lower surface;

a blade portion having a second longitudinal axis, an upper surface and a lower surface, the blade portion being angled with respect to the plate portion so as to define an included angle therebetween;

the plate portion having at least one hole for receiving a bone anchor having a shaft, the hole having a first portion defining a first central axis substantially perpendicular to the lower surface; and

wherein the hole includes a second portion overlapping and in communication with the first portion from the upper surface to the lower surface and defining a second central axis substantially angled with respect to the blade portion, the second hole portion having a periphery, at least a portion of the periphery being threaded, the second hole portion being configured to threadably receive the bone anchor such that the shaft is substantially coaxially aligned with the second central axis and threadably and angularly fixed with respect to the blade portion.

17. The bone plate of claim 16, wherein the thread periphery of the second hole portion angularly ranges about the second central axis from about 190°

to about 280°

.

18. The bone plate of claim 16, further comprising a bone anchor in the form of a first bone screw having a threaded shaft and a threaded head, the bone screw received in the second portion of the at least one hole, the threaded shaft being angled with respect to the blade portion so as to form a truss, wherein the threaded head is engaged with the threaded portion of the periphery of the second portion of the at least one hole so as to lock the bone plate with respect to the bone screw.

19. The bone plate of claim 16, wherein at least a portion of the second hole portion conically tapers from the upper surface to the lower surface.

20. The bone plate of claim 16, wherein the first hole portion of the at least one hole is elongated in the direction of the first longitudinal axis and includes a first substantially spherical counterbore along the upper surface and a second counterbore along the lower surface of the bone plate, the first hole portion being configured to receive a bone anchor having a spherical head and the first counterbore being configured to engage the spherical head for compression or distraction of the fracture.

21. The bone plate of claim 16, wherein the at least one hole is located on bone plate 10 such that at least one of the first and second central axes is spaced relative to the first longitudinal axis of the elongated plate portion.

22. The bone plate of claim 21, further comprising:

a second bone screw having a spherical head; and

a second hole, the second bone screw received in the second hole, the second hole having a first substantially spherical counterbore along the upper surface and a second counterbore along the lower surface of the bone plate, the second bone screw received in the second hole such that the first substantially spherical counterbore is engaged with the spherical head for compression or distraction of the fracture.

23. A bone plate for fixation of a fractured bone, the bone plate comprising:

an elongated plate portion having a first longitudinal axis, an upper surface and a lower surface;

a blade portion having a second longitudinal axis, an upper surface and a lower surface, the blade portion being angled with respect to the plate portion so as to define an included angle therebetween, the blade portion further being configured to be inserted into the interior of the fractured bone;

the plate portion having at least one threaded hole having a central axis, the hole being configured for threadably receiving a bone anchor having a shaft such that the shaft is substantially aligned along the central axis;

wherein the hole is angled relative to the blade portion such that central axis intersects the second longitudinal axis at a point below the lower surface of the bone plate to form a truss.

24. The bone plate of claim 23, wherein the at least one threaded hole conically tapers from upper to lower surface.

25. The bone plate of claim 23, further comprising a bone anchor in the form of a bone screw having a threaded head and a threaded shaft, the bone screw received in the at least one threaded hole such that the threaded head of the bone screw is threadedly engaged with the at least one hole so as to fix the bone plate relative to the bone screw.

26. The bone plate of claim 25, wherein the shaft of the bone screw is angled with respect to the blade portion so as to form a truss, the shaft being of such a length such that at least a portion of the shaft contacts the blade portion of the bone plate.

27. The bone plate of claim 25, further comprising at least a second threaded hole spaced relative to the first threaded hole, the second hole having a central axis, the hole being configured for threadedly receiving a bone anchor having a shaft such that the shaft is substantially aligned along the central axis of the second hole, wherein the second hole is angled relative to the blade portion such that central axis of the second hole intersects the second longitudinal axis at a point below the lower surface of the bone plate to form a truss.

28. The bone plate of claim 27, wherein the central axis of the second threaded hole is angled relative to the central axis of the at least one threaded hole such that a bone anchor received in the second threaded hole is operatively associated with a bone anchor received in the at least one threaded hole.

29. A bone plate system comprising:

at least one bone anchor having a shaft and a head portion;

a bone plate having an elongated plate portion having a first longitudinal axis, an upper surface and a lower surface and a blade portion having a second longitudinal axis, an upper surface and a lower surface, the blade portion being angled with respect to the plate portion so as to define an included angle therebetween ranging between about 75° and

about 110°

;

the plate portion having at least one hole, the hole having a first portion defining a first central axis and including a first counterbore along the upper surface, the first hole portion being configured to receive the bone anchor such that the head is in sliding engagement with the first counterbore; and

wherein the hole includes a second hole portion in communication with the first hole portion from the upper surface to the lower surface and defining a second central axis angled with respect to the blade portion, the second hole portion including a second counterbore, the second hole portion being configured to receive the bone anchor such that the shaft is substantially coaxially aligned with the second central axis and the head portion is fixedly engaged with second counterbore portion.

30. The bone plate system of claim 29, wherein the second counterbore is threaded and the head portion of at least one bone anchor is threaded, the second counterbore being configured for fixed threaded engagement with the head portion of the bone anchor.

31. The bone plate system of claim 29, wherein at least one of the first and second central axes is spaced relative to the first longitudinal axis.

32. The bone plate of claim 29, wherein the upper surface of the blade includes at least one channel.

33. The bone plate of claim 29, wherein the blade includes a bore extending from proximal to distal end, the bore being dimensioned and configured to receive a guide wire.

34. A bone plate for fixation of a fractured bone, the bone plate comprising:

a first longitudinal axis, an upper surface and a lower surface;

at least one hole for receiving a bone anchor having a shaft, the hole having a first hole portion defining a first central axis substantially perpendicular to the lower surface, the first hole portion being configured to receive the bone anchor; and

wherein the hole includes a second hole portion overlapping and in communication with the first hole portion from upper to lower surface and defining a second central axis substantially angled with respect to the first central axis, the second hole portion being configured to receive the bone anchor such that the shaft is not substantially perpendicular with respect to the lower surface of the bone plate at the location of the at least one hole.