Cam-locking of cable for fracture plate

• US 20090105717A1
• Filed: 10/17/2007
• Published: 04/23/2009
• Est. Priority Date: 10/17/2007
• Status: Active Grant

• Current Assignee: Stryker European Operations Holdings, LLC (Stryker Corporation)
• Original Assignee: Stryker Trauma GmbH (Stryker Corporation)
• Inventors: Bluechel, Tobias
• Granted Patent: US 8,142,434 B2
• Time in Patent Office: Days
• US Class Current: 606/280
• CPC Class Codes: A61B 17/8061 specially adapted for particular bones A61B17/70 and A61B17/74 take precedence
• CPC Class Codes: A61B 17/82 for bone cerclage apparatus for manipulating wires or straps A61B17/8861; wires, bands or straps other than cerclage A61B17/842
• CPC Class Codes: F16G 11/00 Means for fastening cables or ropes to one another or to other objects; Caps or sleeves for fixing on cables or ropes attaching ropes or cables to lift cars or cages B66B7/08, to winch drums or barrels B66D1/34; ground anchors E02D5/00; anchoring devices for prestressed members E04C5/00; rope clamps in earth drilling E21B19/12
• CPC Class Codes: F16G 11/101 deforming the cable by moving a part of the fastener
• CPC Class Codes: F16G 11/14 Devices or coupling-pieces designed for easy formation of adjustable loops, e.g. choker hooks; Hooks or eyes with integral parts designed to facilitate quick attachment to cables or ropes at any point, e.g. by forming loops

Abstract

A bone plate mounted on a bone. The bone plate has at least one opening for receiving a flush mounted cam. A through-bore passes from a side surface to opposing side surface of the bone plate. The through-bore has a diameter sized to allow insertion of a cable. A portion of the through-bore intersects with a peripheral portion of the opening. A second opening also passes from the side surface to opposing side surface. A cable may be inserted in the second opening, wrapped around the bone and its free end inserted in the through-bore. The cable may be tightened around the bone. The flush mounted cam can be rotated in place. Rotation of the cam results in the cam surface squeezing the cable between concave cam surface and walls of the opening, thereby locking the cable in the tightened state.

Claims

1. A cam-locking system comprising:

a body;

a first opening, a second opening, and a third opening formed in the body, the third opening extending across the body and being substantially parallel to the second opening;

a cable, the cable passing through the third opening and the second opening and adapted to be pulled tight; and

a flush mounted cam, the cam being inserted in the first opening and operable between a first position that allows the cable to be tightened and a second position that locks the cable in the tightened state.

2. The cam-locking system of claim 1, wherein the cable further comprises:

a first end;

a second end, and

a length extending between the first end and the second end, the length having a first diameter, and wherein the diameter of the first end or the second end is larger than the first diameter.

3. The cam-locking system of claim 2, wherein the cable is made from a material selected from a group consisting of biocompatible materials, metal and strands of biocompatible material.

4. The cam-locking system of claim 2, wherein one of the second opening and the third opening is a groove that is open at a surface of the body.

5. The cam-locking system of claim 2, wherein the flush mounted cam further comprises:

a top;

a bottom; and

a cam surface sandwiched between the top and the bottom.

6. The cam-locking system of claim 4, wherein the cam surface further comprises:

a first surface having a first radius; and

a second surface having a second radius.

7. The cam-locking system of claim 5, wherein the second radius is larger then the first radius.

8. The cam-locking system of claim 7, wherein the profile of the cam surface is concave.

9. The cam-locking system of claim 8, wherein at least a portion of the cam surface has rough texture.

10. The cam-locking system of claim 2, wherein the flush mounted cam further comprises:

a top portion; and

a bottom portion connected to the top portion, wherein the bottom portion has a cam surface.

11. The cam-locking system of claim 10, wherein the cam surface further comprises:

a first surface having a first radius;

a second surface having a second radius; and

a third surface connected to the first surface and the second surface.

12. The cam-locking system of claim 11, wherein at least a portion of the cam surface has rough texture.

13. A bone plate system comprising:

a plate;

at least one screw hole adapted to receive a screw for mounting the plate on a bone;

a first opening, a second opening, and a third opening formed in the plate, the third opening extending across the plate and being substantially parallel to the second opening;

a cable, the cable passing through the third opening and the second opening and adapted to be pulled tight; and

a flush mounted cam, the cam being inserted in the first opening and operable between a first position that allows the cable to be tightened and a second position that locks the cable in the tightened state.

14. The bone plate system of claim 13, wherein the cable further comprises:

a first end;

a second end, and

a length extending between the first end and the second end, the length having a first diameter, and wherein the diameter of the first end or the second end is larger than the first diameter.

15. The bone plate system of claim 14, wherein the cable is made from a material selected from a group consisting of biocompatible materials, metal and strands of biocompatible material.

16. The bone plate system of claim 13, wherein the flush mounted cam further comprises:

a top;

a bottom; and

a cam surface sandwiched between the top and the bottom.

17. The bone plate system of claim 16, wherein the cam surface further comprises:

a first surface having a first radius; and

a second surface having a second radius.

18. The bone plate system of claim 17, wherein the second radius is larger then the first radius.

19. The bone plate system of claim 18, wherein the profile of the cam surface is concave.

20. The bone plate system of claim 19, wherein at least a portion of the cam surface has rough texture.

21. The bone plate system of claim 13, wherein the flush mounted cam further comprises:

a top portion; and

a bottom portion connected to the top portion, wherein the bottom portion has a cam surface.

22. The bone plate system of claim 21, wherein the cam surface further comprises:

a first surface having a first radius;

a second surface having a second radius; and

a third surface connected to the first surface and the second surface.

23. The bone plate system of claim 22, wherein at least a portion of the cam surface has rough texture.