Anchoring means for intervertebral implants

• US 20070073395A1
• Filed: 04/11/2003
• Published: 03/29/2007
• Est. Priority Date: 04/11/2003
• Status: Active Grant

• Current Assignee: Synthes USA LLC (Johnson & Johnson)
• Original Assignee: Synthes USA LLC (Johnson & Johnson)
• Inventors: Burri, Adrian, Claude, Mathieu, Baumgartner, Daniel
• Granted Patent: US 7,628,815 B2
• Time in Patent Office: Days
• US Class Current: 623/17.110
• CPC Class Codes: A61F 2/30728 Collars; Bone edge protectors A61F2/30734 takes precedence; sealing collars for use during cementing A61B17/8808
• CPC Class Codes: A61F 2/30734 Modular inserts, sleeves or augments, e.g. placed on proximal part of stem for fixation purposes or wedges for bridging a bone defect
• CPC Class Codes: A61F 2/442 Intervertebral or spinal discs, e.g. resilient non-disc-shaped intervertebral inflatable pockets A61F2/441; non-disc-shaped intervertebral fusion implants A61F2/4455
• CPC Class Codes: A61F 2002/30113 circular
• CPC Class Codes: A61F 2002/30125 elliptical or oval
• CPC Class Codes: A61F 2002/30133 kidney-shaped or bean-shaped
• CPC Class Codes: A61F 2002/30138 Convex polygonal shapes
• CPC Class Codes: A61F 2002/302 toroidal, e.g. rings
• CPC Class Codes: A61F 2002/30332 Conically- or frustoconically-shaped protrusion and recess
• CPC Class Codes: A61F 2002/305 Snap connection
• CPC Class Codes: A61F 2002/30507 using a threaded locking member, e.g. a locking screw or a set screw
• CPC Class Codes: A61F 2002/30518 with possibility of relative movement between the prosthetic parts
• CPC Class Codes: A61F 2002/30579 with mechanically expandable devices, e.g. fixation devices
• CPC Class Codes: A61F 2002/30601 telescopic
• CPC Class Codes: A61F 2002/30604 modular
• CPC Class Codes: A61F 2002/30772 Apertures or holes, e.g. of circular cross section
• CPC Class Codes: A61F 2002/30841 Sharp anchoring protrusions for impaction into the bone, e.g. sharp pins, spikes
• CPC Class Codes: A61F 2220/0025 Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
• CPC Class Codes: A61F 2220/0033 made by longitudinally pushing a protrusion into a complementary-shaped recess, e.g. held by friction fit
• CPC Class Codes: A61F 2230/0006 circular
• CPC Class Codes: A61F 2230/0008 : elliptical or oval
• CPC Class Codes: A61F 2230/0015 : Kidney-shaped, e.g. bean-shaped
• CPC Class Codes: A61F 2230/0017 : Angular shapes
• CPC Class Codes: A61F 2230/0065 : toroidal, e.g. ring-shaped, doughnut-shaped
• CPC Class Codes: A61F 2250/0063 : Nested prosthetic parts
• CPC Class Codes: B60R 11/0241 : for telephones
• CPC Class Codes: F01C 1/067 : having cam-and-follower type drive
• CPC Class Codes: H01Q 1/3291 : mounted in or on other locations inside the vehicle or vehicle body
• CPC Class Codes: H01Q 17/00 : Devices for absorbing waves radiated from an antenna; Combinations of such devices with active antenna elements or systems

Abstract

The invention relates to an anchor piece for fixing an intervertebral implant (15) to the end plate of a vertebra body (19;20), comprising A) an anchor piece (1), with a central axis (6) and two end faces (4, 5) transverse to the central axis (6), B) at least two spikes (7) extending from one of the end faces (4;5), parallel to the central axis (6) and which may be pushed into an end plate of a vertebral body (19;20), whereby B) the anchor piece (1) has a cavity (3) extending through the anchor piece (1) in the direction of the central axis (6) and C) the anchor piece (1) comprises fixing means (9), by means of which the anchor piece may be detachably locked to an intervertebral implant (15).

Claims

1. An intervertebral implant (15) with two anchoring means (21) to fix the intervertebral implant (15) on the end plates of a body (19, 20) of the vertebra wherein

A) each anchoring means (21) comprises an anchoring part (1) comprising a central axis (6) and two end faces (4, 5) transverse to the central axis (6),

B) each anchoring means (21) comprises at least two spikes (7) that protrude past the end faces (4, 5), are parallel to the central axis (6) and can be pressed into an end plate of a body (19, 20) of the vertebra, characterised in that

C) the anchoring part (1) comprises a hollow space (3) passing through parallel to the central axis (6),

D) the anchoring part (1) comprises fastening means (9) by means of which the anchoring part can be detachably locked on an intervertebral implant (15),

E) the intervertebral implant (15) comprises a closing plate each (13, 14) that intersects the central axis (6), and

F) the closing plates (13, 14) can pass through the hollow spaces (3) in the anchoring parts (1).

2. An intervertebral implant (15) according to claim 1, characterised in that the fastening means (9) can be elastically deformed transversely to the central axis (6) and in the non-deformed state protrude into the hollow space (3).

3. An intervertebral implant (15) according to claim 2, characterised in that the fastening means (9) are hooks (10) that can be elastically deformed transversely to the central axis (6) with lugs (11) facing the central axis (6).

4. An intervertebral implant (15) according to claim 3, characterised in that the hooks (10) are provided in the hollow space (3).

5. An intervertebral implant (15) according to any one of claims 1 to 4, characterised in that the fastening means (9) and the anchoring part (1) are integral.

6. An intervertebral implant (15) according to any one of claims 3 to 5, characterised in that the hollow space (3) comprises depressions (8), wherein the hooks (10) are provided.

7. An intervertebral implant (15) according to claim 6, characterised in that perpendicularly to the central axis (6) the recesses (8) have a depth T and the maximum length of the lugs (11), measured perpendicularly to the central axis (6), is L, while L<

T.

8. An intervertebral implant (15) according to any one of claims 1 to 7, characterised in that the anchoring part (1) has an annular construction and the cross-sectional surface of the hollow space (3) at right angles to the central axis (6) and/or the cross-sectional surface of the anchoring part (1) bordered by the external sheathing surface at right angles to the central axis (6) are circular surfaces, elliptical surfaces, polygonal surfaces or oval surfaces.

9. An intervertebral implant (15) according to any one of claims 1 to 8, characterised in that at each end it comprises a closing plate (13, 14) that intersects the central axis (6) and that the shape of the hollow space (3) is made to suit the closing plates (13, 14).

10. An intervertebral implant (15) according to claim 9, characterised in that the closing plates (13, 14) are mounted without clearance in the hollow spaces (3) of the anchoring parts (1) and can be displaced relative to the central axis (6).

11. An intervertebral implant (15) according to any one of claims 1 to 8, characterised in that the anchoring parts (1) have a clearance for rotation about the central axis (6) with fastening means (9) fixed on the closing plates (13, 14).

12. An intervertebral implant (15) according to any one of claims 1 to 11, characterised in that the closing plates (13, 14) comprise second fastening means, in which the fastening means (9) can be engaged on the anchoring parts (1).

13. An intervertebral implant (15) according to claim 12, characterised in that it has an external sheathing surface (16) and as second fastening means it comprises depressions (18) protruding into the sheathing surface (16) transversely to the central axis (6) for the partial accommodation of the fastening means (9).

14. An intervertebral implant (15) according to any one of claims 1 to 13, characterised in that the closing plates (13, 14) have axially projecting.

15. A method to fasten an implant according to any one of claims 1 to 14 within an intervertebral space, characterised by the steps:

a) enabling the access to the intervertebral space by means of an anterolateral, ventral lateral, transperitonial or retroperitonial surgical procedure,

b) tractioning both bodies (19, 20) of the vertebra adjacent to the intervertebral space,

c) scraping out the intervertebral space,

d) introducing the intervertebral implant (15) with the anchoring means (1) pushed together,

e) moving the anchoring parts (1) axially away from one another until the spikes (7) are adequately pressed into the base plate or the cover plate of the adjacent bodies (19, 20) of the vertebra, and

f) fixing the fastening means (9) on the intervertebral implant (15).