Intervertebral implant with moveable endcaps

• US 7,628,815 B2
• Filed: 04/11/2003
• Issued: 12/08/2009
• Est. Priority Date: 04/11/2003
• Status: Expired due to Term

• Current Assignee: Synthes USA LLC (Johnson & Johnson)
• Original Assignee: Synthes USA LLC (Johnson & Johnson)
• Inventors: Claude, Mathieu, Burri, Adrian, Baumgartner, Daniel
• Primary Examiner(s): Robert; Eduardo C
• Assistant Examiner(s): MERENE, JAN CHRISTOP L
• Application Number:
  US10/552,675
• Publication Number:
  US 20070073395A1
• Time in Patent Office: 2,433 Days
• Field of Search: 623/17.11, 623/17.16, 623/17.12, 623/17.13, 623/17.14, 623/17.15, 606/61, 606/246, 606/249, 606/252, 606/279, 403/326, 403/329, 411/512
• US Class Current: 623/17.15
• 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. A method of implanting an intervertebral implant into an intravertebral disc space between upper and lower vertebra comprising the steps of:

a) providing an intervertebral implant including;

an intervertebral spacer body having an upper endface to contact at least a portion of the upper vertebra and a lower endface to contact at least a portion of the lower vertebra;

a first end member including a plurality of spikes for engaging at least a portion of the upper vertebra and one or more elastically deformable projections extending from an inner surface of an internal bore formed in the first end member; and

a second end member including a plurality of spikes for engaging at least a portion of the lower vertebra and one or more elastically deformable projections extending from an inner surface of an internal bore formed in the second end member,

each of the one or more projections of the first and second end members includes a transversely extending lug for engaging the intervertebral spacer body;

b) providing access to the intervertebral disc space;

c) inserting the intervertebral implant into the intervertebral disc space such that the upper endface of the spacer body contacts at least a portion of the upper vertebra and the lower endface of the spacer body contacts at least a portion of the lower vertebra;

d) slidably, non-rotatably moving the first and second end members with respect to the intervertebral spacer body between a second position to a first position;

wherein in the second position;

the plurality of spikes formed on the first end member does not extend beyond the upper endface of the spacer body and the pluarality of spikes formed on the second end member does not extend beyond the lower endface of the spacer body, the one or more projections of the first end member are in contact with the inner surface of the internal bore of the first end member, and the one or more projections of the second end member are in contact with the inner surface of the internal bore of the second end member,

and in the first position;

the plurality of spikes formed on the first end member extend beyond the upper endface of the spacer body and at least partially into engagement with the upper vertebra and the plurality of spikes formed in the second end member extend beyond the lower endface of the spacer body at least partially into engagement with the lower vertebrae,

e) securing the position of the first and second end members to the intervertebral spacer body in the first position by the one or more projections of the first end member moving out of contact with the inner surface of the internal bore formed in the first end member and the one or more projections of the second end member moving out of contact with the inner surface of the internal bore formed in the second end member so that the lugs of the one or more projecting members of the first and second end members become engaged to the spacer body.