Plate for osteosynthesis device and method of preassembling such device

• US 8,162,988 B2
• Filed: 10/18/2002
• Issued: 04/24/2012
• Est. Priority Date: 10/18/2001
• Status: Expired due to Fees

• Current Assignee: LDR Medical
• Original Assignee: LDR Medical
• Inventors: Tropiano, Patrick, Ganglof, Serge, Delecrin, Joël, Allain, Jérôme, Poncer, Rémi
• Primary Examiner(s): Robert, Eduardo C
• Assistant Examiner(s): COMSTOCK, DAVID C
• Application Number:
  US10/492,827
• Publication Number:
  US 20050010215A1
• Time in Patent Office: 3,476 Days
• Field of Search: 606/61, 606 69- 73
• US Class Current: 606/266
• CPC Class Codes: A61B 17/7001 Screws or hooks combined with longitudinal elements which do not contact vertebrae A61B17/7058 takes precedence
• CPC Class Codes: A61B 17/7007 Parts of the longitudinal elements, e.g. their ends, being specially adapted to fit around the screw or hook heads
• CPC Class Codes: A61B 17/701 Longitudinal elements with a non-circular, e.g. rectangular, cross-section A61B17/7005, A61B17/7007 take precedence
• CPC Class Codes: A61B 17/7011 Longitudinal element being non-straight, e.g. curved, angled or branched adjustable length longitudinal elements A61B17/7014; A61B17/7019 takes precedence, e.g. coil springs
• CPC Class Codes: A61B 17/7037 wherein pivoting is blocked when the rod is clamped
• CPC Class Codes: A61B 17/7041 with single longitudinal rod offset laterally from single row of screws or hooks A61B17/7044 takes precedence
• CPC Class Codes: A61B 17/7082 for driving, i.e. rotating, screws or screw parts specially adapted for spinal fixation, e.g. for driving polyaxial or tulip-headed screws driving other bone screws A61B17/8875
• CPC Class Codes: A61B 17/864 hollow, e.g. with socket or cannulated
• CPC Class Codes: Y10T 29/49826 Assembling or joining

Abstract

An osteosynthesis device is proposed, particularly for spinal support or correction, enabling easier and compact implantation, that can be particularly used in the case of implantation via the anterior approach, and a preassembly method for such a device. In various embodiments, the device comprises implants screwed into two vertebrae (0) and a plate (2) used to hold and displace the spine. In various embodiments, the plate (2) comprises on at least one of its ends at least one longitudinally elongated opening, the opening having firstly at least one part opening onto an edge of the plate, or one part of a sufficiently large size (s210b) to be able to be inserted without disassembly in the fixation means of an implant (1) already screwed into the spine when the fixation means are already assembled.

Claims

1. Osteosynthesis device comprising:

a plurality of vertebral implants, each implant comprising an attachment structure for a spinal support element and at least one of the implants comprising a universal joint between a screw head of the implant and a clamping support head of the implant, and a clamping support that is mobile with respect to the rest of the implant; and

an elongated spinal support element comprising

at least one longitudinally elongated opening on at least a first end of the elongated spinal support element, the at least one longitudinally elongated opening

being configured for insertion in the attachment structure of a first one of the implants with the attachment structure of the first one of the implants assembled loosely, and

having a part with a substantially constant width configured to slide longitudinally in the loosely assembled attachment structure of the first one of the implants after being inserted therein,

the elongated spinal support element being configured

to be assembled at the first end of the elongated spinal support element on the first one of the implants,

to slide in relation to the attachment structure of the first one of the implants so that a second end of the elongated spinal support element can be inserted in the attachment structure of a second one of the implants with the attachment structure of the second one of the implants assembled loosely, and

to slide in relation the loosely assembled attachment structures of each of the first and second one of the implants to bring the elongated spinal support element into configuration for fixation by the attachment structures to each of the first and second one of the implants.

2. Osteosynthesis device according to claim 1 further comprising a screw head housing receiving the clamping support head, having a dimension that is sufficient to allow clearance and retention of the clamping support along a specified angle between an axis of the clamping support and an axis of the implant.

3. Osteosynthesis device according to claim 1 in which the clamping support head has a star shaped cross-section with rounded ends along a plane perpendicular to a support axis.

4. Osteosynthesis device according to claim 1 in which the clamping support comprises a threading cooperating with a nut to retain the elongated spinal support element against the clamping support.

5. Osteosynthesis device according to claim 1 in which an end of the clamping support is adapted to receive a rotational drive tool for said implant.

6. Osteosynthesis device comprising:

a plurality of vertebral implants, each implant comprising

an attachment structure for a spinal support element; and

a plate support retained on the implant that is rotatable about the implant;

an elongated spinal support element comprising

at least one longitudinally elongated opening on at least a first end of the elongated spinal support element, the at least one longitudinally elongated opening

being configured for insertion in the attachment structure of a first one of the implants with the attachment structure of the first one of the implants assembled loosely, and

having a part with a substantially constant width configured to slide longitudinally in the loosely assembled attachment structure of the first one of the implants after being inserted therein,

the elongated spinal support element being configured

to be assembled at the first end of the elongated spinal support element on the first one of the implants,

to slide in relation to the attachment structure of the first one of the implants so that a second end of the elongated spinal support element can be inserted in the attachment structure of a second one of the implants with the attachment structure of the second one of the implants assembled loosely, and

to slide in relation the loosely assembled attachment structures of each of the first and second one of the implants to bring the elongated spinal support element into configuration for fixation between the attachment structure and the plate support of each of the first and second one of the implants.

7. Osteosynthesis device according to claim 6 in which the elongated spinal support element comprises two parts joined together by a joining part that is located in an inner part of the elongated spinal support element at a distance from the first and second ends of said elongated spinal support element sufficient to enable the attachment of the elongated spinal support element onto the first and second implants with the first and second implants disposed on opposite sides of the joining part.

8. Osteosynthesis device according to claim 7 in which the joining part is located in a position offset with respect to the center of the length of the elongated spinal support element.

9. Osteosynthesis device according to claim 6 in which the elongated spinal support element has peripheral edges that form an “

H”

or “

h”

shape.

10. Osteosynthesis device according to claim 6 in which the part of the at least one longitudinally elongated opening with a substantially constant width is located at a first region, and the at least one longitudinally elongated opening has a second region having a width larger than the width in the first region, the width in the second region sufficient to clear a clamp of the attachment structure of the first implant.

11. Osteosynthesis device according to claim 6 in which the attachment structure of at least one of the implants is configured to hold the elongated spinal support element while allowing said implant to rotate about its screwing axis with said attachment structure loosely assembled.

12. Osteosynthesis device according to claim 6 in which at least one of the implants has an elongated shape around an implant axis and comprises

a first bone anchoring threaded end;

a second end having an elongated part; and

a clamp along the elongated part of the second end for clamping the elongated spinal support element against the plate support.

13. Osteosynthesis device according to claim 6 in which the elongated spinal support element is configured to at least partially surround at least one of the implants and to rest on a surface of the plate support, the plate support having a concave surface in the form of a spherical portion configured to be supported on a head of said implant.

14. Osteosynthesis device according to claim 6 in which the elongated spinal support element is configured to at least partially surround at least one of the implants and to rest on a surface of the plate support, the plate support configured to be supported on a shoulder of said implant.

15. Osteosynthesis device according to claim 6 in which at least one of the implants comprises a clamping support having a first elongated end along a support axis and a second end having a clamping support head, the clamping support head having a non-circular cross-section along a plane perpendicular to the support axis and having at least one concave part and at least one dimension that is greater than at least one cross-section of the first elongated end of the clamping support;

the clamping support head having a section that is substantially circular in cross section along a plane including the support axis, and being disposed in a screw head housing comprising at least one projecting part cooperating with the concave part of the clamping support head to prevent rotation of the clamping support around the support axis.

16. Osteosynthesis device according to claim 15 in which an inner surface of the screw head housing has a shape that is substantially complementary to the outer surface of the clamping support head.

17. Osteosynthesis device according to the claim 6 wherein at least one of the implants has a first bone anchorage end that has a longitudinal bore concentric to an outer surface, the bore communicating with space outside the outer surface through at least one bone fusion opening disposed in a wall between the longitudinal bore and the outer surface, the bone fusion opening being configured to allowing fusion between bone substance located inside the longitudinal bore and bone substance outside of the outer surface.

18. Osteosynthesis device according to claim 17 in which the first bone anchorage end has two threadings that are adapted to wind in the same direction along said implant, with one threadings being disposed on the outer surface and the other threading being disposed on the inner surface of the longitudinal bore.

19. Osteosynthesis device according to claim 6 further comprising at least one bone fusion opening in at least one of the implants comprising a longitudinal oblong hole.

20. Osteosynthesis device according to claim 6 in which the elongated spinal support element comprises one or more bars.

21. Osteosynthesis device according to claim 6 in which the elongated spinal support element comprises a plate.

22. Osteosynthesis device according to claim 6 in which the attachment structure of at least one of the implants is configured to hold the elongated spinal support element while allowing clearance of the elongated spinal support element with respect to the implant with said attachment structure loosely assembled.

23. A method for preassembling an osteosynthesis device comprising:

providing a device according to claim 6;

assembling a elongated spinal support element on a plate support of an implant; and

assembling an attachment structure on said implant.

24. Osteosynthesis device according to claim 6, in which at least one of the implants further comprises an anchor along a first portion of the implant and a clamping support along a second portion of the implant, the clamping support comprising a clamping support head disposed toward the anchor.

25. Osteosynthesis device according to claim 24 further comprising a screw head housing receiving the clamping support head, having a dimension that is sufficient to allow clearance and retention of the clamping support along a specified angle between an axis of the clamping support and an axis of the implant.

26. Osteosynthesis device according to claim 24 in which the clamping support head has a star shaped cross-section with rounded ends along a plane perpendicular to a support axis.

27. Osteosynthesis device according to claim 24 in which the clamping support comprises a threading cooperating with a nut to retain the elongated spinal support element against the clamping support.

28. Osteosynthesis device according to claim 24 in which an end of the clamping support is adapted to receive a rotational drive tool for said implant.