Reconstruction system for vertebra

• US 6,106,557 A
• Filed: 07/22/1999
• Issued: 08/22/2000
• Est. Priority Date: 07/23/1998
• Status: Expired due to Term

• Current Assignee: Stryker European Operations Holdings, LLC (Stryker Corporation)
• Original Assignee: Howmedica GmbH
• Inventors: Windhager, Reinhard, Kotz, Rainer, Vlasak, Richard G., Robioneck, Bernd, Wuisman, Paul
• Primary Examiner(s): Mancene, Gene
• Assistant Examiner(s): Philogene, Pedro
• Application Number:
  US09/359,271
• Time in Patent Office: 397 Days
• Field of Search: 623/11, 623/16, 623/17, 623/20, 623/21, 606/60, 606/61
• US Class Current: 623/17.15
• CPC Class Codes: A61B 17/7059 Cortical plates A61B17/7007, A61B17/7058 take precedence
• CPC Class Codes: A61B 17/86 Pins or screws or threaded wires; nuts therefor A61B17/72 take precedence
• CPC Class Codes: A61F 2/44 for the spine, e.g. vertebrae, spinal discs
• CPC Class Codes: A61F 2002/30126 oval-O-shaped
• CPC Class Codes: A61F 2002/30228 Cylinders of elliptical or oval basis
• CPC Class Codes: A61F 2002/3023 wedge-shaped cylinders
• CPC Class Codes: A61F 2002/30235 tubular, e.g. sleeves
• CPC Class Codes: A61F 2002/30494 Cooperating protrusions and recesses, e.g. radial serrations, located on abutting end surfaces of a longitudinal connection
• CPC Class Codes: A61F 2002/3055 for adjusting length
• CPC Class Codes: A61F 2002/30578 having apertures, e.g. for receiving fixation screws
• CPC Class Codes: A61F 2002/30593 hollow
• CPC Class Codes: A61F 2002/30599 stackable
• CPC Class Codes: A61F 2002/30604 modular
• CPC Class Codes: A61F 2002/30785 parallel
• CPC Class Codes: A61F 2002/30787 inclined obliquely with respect to each other
• CPC Class Codes: A61F 2220/0025 Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
• CPC Class Codes: A61F 2230/0008 elliptical or oval
• CPC Class Codes: A61F 2230/0069 cylindrical
• CPC Class Codes: A61F 2250/0063 Nested prosthetic parts
• CPC Class Codes: Y10S 606/907 Composed of particular material or coated

Abstract

A reconstruction system for vertebra, with at least one annular middle body and two annular end bodies. The end surfaces of the middle body and of the end bodies are formed such that the bodies may be stacked over one another and one end surface of the end bodies comprises a receiving section. The system includes two approximately right-angled vertebra body plates having a pair of limbs. One limb is formed such that in a direction perpendicular to the axis of an end body, it is insertable into the receiving section in a manner such that the one limb is prevented from moving away from the end body in the direction of the axis. The other limb comprises at least one bore for a bone screw and at least one threaded bore. A connection plate is provided, which at the ends comprises openings for connection to the other limb of each vertebra body plate via a screw.

Claims

1. A reconstruction system for vertebra, comprising:

at least one annular middle body having end surfaces;

two annular end bodies having end surfaces, wherein the end surfaces of the middle body and of the end bodies are formed such that the bodies may be stacked over one another and one end surface of the end bodies comprises a receiving section having an axis;

two approximately right-angled vertebra body plates having a pair of limbs of which a first limb is formed such that in a direction perpendicular to an axis of an end body, said limb is insertable into the receiving section in a manner such that the limb is prevented from moving away from the end body in the direction of the axis, whilst a second limb includes at least one bore for a bone screw and at least one threaded bore; and

a connection plate, having ends including openings for connection to the second limb via a screw.

2. The reconstruction system according to claim 1, wherein the bodies are oval and the axis of the receiving section runs along the larger diameter of the oval.

3. The reconstruction system according to claim 2, wherein cooperating end surfaces of the bodies have teeth such that the bodies are displaceable relative to one another only in one direction.

4. The reconstruction system according to claim 3 wherein the displacement direction runs in the direction of the large diameter of the oval.

5. The reconstruction system according to claim 1, wherein the end surfaces of the middle body are formed the same.

6. The reconstruction system according to claim 1, wherein there is provided a set of middle bodies of a graded length.

7. The reconstruction system according to claim 1, wherein the end surface of the end body, which faces the middle body, is formed complementarily to the end surfaces of the middle body.

8. The reconstruction system according to claim 1, wherein the receiving section comprises a dovetail guide and the first limb of the vertebra body plate in cross section is formed complementary thereto.

9. The reconstruction system according to claim 8, wherein the first limb comprises two parallel distanced runners which are connected at the ends.

10. The reconstruction system according to claim 9, wherein the connecting end comprises a chamfering for the simplified introduction into the receiving section.

11. The reconstruction system according to claim 10, wherein the inner sides of the runners form a dovetail guide.

12. The reconstruction system according to claim 1, wherein the end surfaces of the end bodies are inclined to the axis of the end bodies at an angle which is not equal to 90°

.

13. The reconstruction system according to claim 12, wherein the angle of inclination lies in a plane which runs parallel to a plane in which the second limb of the vertebra plates lie.

14. The reconstruction system according to claim 1, wherein in the end surfaces of the bodies are oval and there are bores formed therein for the accommodation of pin-shaped securing elements.

15. The reconstruction system according to claim 14, wherein a securing element at the ends is formed as a spring clip which under the effect of the spring cooperates with the bores.

16. The reconstruction system according to claim 15, wherein the bores in the end surfaces are arranged at the ends of the oval.

17. The reconstruction system according to claim 16, wherein the head of the bone screw is countersunk in the bore of the second limb.

18. The reconstruction system according to claim 17, wherein the head of the bone screw is spherical and the opening in the second limb comprises a spherical countersinking.

19. The reconstruction system according to claim 18, wherein the second limb on a side proximal to the first limb comprises at least one sharp spike.

20. The reconstruction system according to claim 1, wherein the connection plate between the ends comprises an elongate hole and there is provided an adjusting pin with threaded sections formed on both sides of a radial collar located between ends of the pin, a first threaded section for setting the distance of the connection plate to the bodies and the other threaded section extends through the elongate hole and is connected to the plate with a nut.