Osteosynthetic implant with an embedded hinge joint

• US 6,663,632 B1
• Filed: 11/17/2000
• Issued: 12/16/2003
• Est. Priority Date: 05/19/1998
• Status: Expired due to Fees

• Current Assignee: Synthes USA LLC (Johnson & Johnson)
• Original Assignee: Synthes USA LLC (Johnson & Johnson)
• Inventors: Frigg, Robert
• Primary Examiner(s): Reip, David O.
• Assistant Examiner(s): ROBERTS, PAUL A
• Application Number:
  US09/714,147
• Time in Patent Office: 1,124 Days
• Field of Search: 606/69, 606/70, 606/71, 606/72, 606/73, 411/537, 411/538
• US Class Current: 606/246
• CPC Class Codes: A61B 17/7035 Screws or hooks, wherein a rod-clamping part and a bone-anchoring part can pivot relative to each other
• CPC Class Codes: A61B 17/80 Cortical plates , i.e. bone plates; Instruments for holding or positioning cortical plates, or for compressing bones attached to cortical plates
• CPC Class Codes: A61B 17/8047 wherein the additional element surrounds the screw head in the plate hole A61B17/8052 takes precedence
• CPC Class Codes: A61B 17/8052 immobilised relative to screws by interlocking form of the heads and plate holes, e.g. conical or threaded
• CPC Class Codes: A61F 2/4425 made of articulated components
• CPC Class Codes: A61F 2002/30634 biaxial

Abstract

An osteosynthesis implant includes at least one coupling in the form of a swivel joint. Each swivel joint includes at least one planar or annular swivel element and two connecting arms that define a pivot axis. The coupling permits rotation about each pivot axis. The implant and coupling may be formed of unitary construction, or a separate coupling may be connectable to the implant. The coupling may receive a bone fastener such as a bone screw, or may be used in applications that require the coupling to directly support portions of the body such as spinal features.

Claims

1. An osteosynthesis implant that includes a coupling comprising at least one annular element having a pair of connecting members for coupling to a surrounding structure and for providing the annular element with swiveling motion with respect to the surrounding structure for alignment of the annular element during insertion or implantation of the implant.

2. The osteosynthesis implant of claim 1, wherein the connecting members form a single coupling axis with the surrounding structure and the annular element swivels about the coupling axis.

3. The osteosynthesis implant of claim 1, wherein the annular element defines a hole for receiving a fastener and the surrounding structure is the implant.

4. The osteosynthesis implant of claim 1, wherein inner and outer annular elements are provided each element having a pair of connecting members, with the connecting members of the inner annular element coupled to the outer annular element and the connecting members of the outer annular element coupled to the surrounding structure, such that the inner annular element is provided with a first swiveling motion and the outer annular element is provided with a second swiveling motion.

5. The osteosynthesis implant of claim 4, wherein connecting members of the inner annular element form a first coupling axis and the connecting members of the outer annular element form a second coupling axis that is positioned at an angle with respect to the first coupling axis.

6. The osteosynthesis implant of claim 5, wherein the first and second coupling axes are substantially perpendicular to each other and the inner and outer annular elements have a generally circular configuration.

7. The osteosynthesis implant of claim 4, wherein the inner and outer annular elements, connecting members and implant are formed of unitary construction and each connecting member is capable of exhibiting elastic deformation to permit the annular element to swivel.

8. The osteosynthesis implant of claim 4, wherein the implant is an intervertebral element having at least one surface that includes the surrounding structure in which the inner and outer annular elements are disposed.

9. The osteosynthesis implant of claim 8, wherein the intervertebral element has two parallel surfaces, each of which provides the surrounding structure in which the inner and outer annular elements are disposed, that define a central longitudinal axis and has a first through-hole extending generally perpendicular to the central longitudinal axis and has a second through-hole extending generally perpendicular to the first through-hole.

10. The osteosynthesis implant of claim 8, wherein the intervertebral element has top and bottom surfaces, each of which provides the surrounding structure in which inner and outer annular elements are disposed, so that more precise alignment can be provided.

11. The osteosynthesis implant of claim 10, wherein the top and bottom surfaces are configured as plates and are spaced apart from each other with a central connector.

12. The osteosynthesis implant of claim 11, wherein the central connector is generally cylindrical and the plates are generally oval.

13. The osteosynthesis implant of claim 11, wherein the central connector is fixed to the inner annular elements, such that swivelling of the plates is permitted while the inner annular elements remain parallel to each other.

14. The osteosynthesis implant of claim 11, wherein connecting members of the inner annular element form a first coupling axis and the connecting members of the outer annular element form a second coupling axis that is generally perpendicular to the first coupling axis.

15. The osteosynthesis implant of claim 11, wherein the implant is configured and dimensioned to be received between two vertebral bodies.

16. The osteosynthesis implant of claim 3, wherein the annular element has a top surface, a bottom surface, and a first thickness defined between the top and bottom surfaces, wherein the implant further includes a top implant surface, a bottom implant surface, and a second thickness defined between the top and bottom implant surfaces, wherein the first thickness is less than or equal to the second thickness.

17. The osteosynthesis implant of claim 16, wherein the connecting members have a connection thickness that is less than or equal to the second thickness.

18. The osteosynthesis implant of claim 16, wherein the hole is generally cylindrical and extends along a central axis that is generally perpendicular to at least one of the top and bottom surfaces of the annular element.

19. The osteosynthesis implant of claim 4, wherein the surrounding structure is a fixation system for a longitudinal support, wherein the inner annular element includes a hole for a pedicle screw.

20. The osteosynthesis implant of claim 19, wherein the fixation system comprises a mounting head having a top surface and bottom surface, a first head bore extending from the top to bottom head surfaces about a head bore longitudinal axis and a second head bore extending substantially perpendicular to the first head bore, the second head bore configured and dimensioned to receive a longitudinal support.