Intervertebral implant

• US 10,492,922 B2
• Filed: 01/09/2017
• Issued: 12/03/2019
• Est. Priority Date: 02/19/2002
• Status: Expired due to Term

• Current Assignee: Depuy Synthes Products Incorporated (Johnson & Johnson)
• Original Assignee: Depuy Synthes Products Incorporated (Johnson & Johnson)
• Inventors: Mathieu, Claude, Cain, Christopher Marden John
• Primary Examiner(s): Snow, Bruce E
• Application Number:
  US15/401,713
• Publication Number:
  US 20170143509A1
• Time in Patent Office: 1,058 Days
• Field of Search: None
• 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: A61B 17/86 Pins or screws or threaded wires; nuts therefor A61B17/72 take precedence
• 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 2/4455 for the fusion of spinal bodies, e.g. intervertebral fusion of adjacent spinal bodies, e.g. fusion cages intervertebral discs A61F2/442
• CPC Class Codes: A61F 2/4465 having a circular or kidney shaped cross-section substantially perpendicular to the axis of the spine
• CPC Class Codes: A61F 2/447 substantially parallelepipedal, e.g. having a rectangular or trapezoidal cross-section
• CPC Class Codes: A61F 2002/30004 the prosthesis being made from materials having different values of a given property at different locations within the same prosthesis
• CPC Class Codes: A61F 2002/30593 hollow
• CPC Class Codes: A61F 2002/30774 internally-threaded
• CPC Class Codes: A61F 2002/30777 Oblong apertures
• CPC Class Codes: A61F 2002/3079 Stepped or enlarged apertures, e.g. having discrete diameter changes
• CPC Class Codes: A61F 2002/30841 Sharp anchoring protrusions for impaction into the bone, e.g. sharp pins, spikes
• CPC Class Codes: A61F 2250/0014 having different values of a given property or geometrical feature, e.g. mechanical property or material property, at different locations within the same prosthesis
• CPC Class Codes: A61F 2310/00011 Metals or alloys

Abstract

The intervertebral implant is in the form of a three-dimensional structure (10) comprising (a) a top side (1) and an underside (2) which are designed to rest against the end plates of two adjacent vertebras, (b) a left side face (3) and a right side face (4), (c) a front face (5) and a rear face (6), (d) a horizontal center plane situated between the top side (1) and the underside (2), (e) a vertical center plane (8) situated between the left side face (3) and the right side face (8) and (f) a plurality of boreholes (9) passing through the implant structure (10) that are designed to receive longitudinal affixation elements (20), the axes (19) of said elements intersecting the horizontal center plane (7). At least one of the boreholes (9) is designed in a manner that the affixation element (10) received in it can be rigidly connected to the intervertebral implant. Said connection is implemented using a thread or by matching conical surfaces.

Claims

1. An intervertebral implant configured to be inserted into a space between an endplate of an upper vertebral body and an endplate of a lower vertebral body, the intervertebral implant comprising:

an implant structure defining a front face a rear face, the front face spaced from the rear face in a first direction, a top side, and an underside opposite the top side in a second direction that is perpendicular to the first direction; and

a plate including a front plate surface and a rear plate surface that is opposite the front plate surface, the plate further including a hole with an opening defined by the front plate surface, the hole being configured to receive a bone screw to secure the intervertebral implant to one of the upper vertebral body and the lower vertebral body, the plate configured to be coupled to the implant structure such that

     1) the rear plate surface faces the front face of the implant structure,

     2) an entirety of the opening is positioned between the top side and the underside with respect to the second direction,

     3) the plate is movable relative to the implant structure along the second direction while interference between the implant structure and the plate restricts movement of the plate away from the implant structure in the first direction,

wherein the rear face of the implant structure defines a rearmost surface of the intervertebral implant.

2. The intervertebral implant of claim 1, wherein the plate includes an upper plate surface and a lower plate surface opposite the upper plate surface in the second direction when the plate is coupled to the implant structure, the plate defines a maximum plate height measured from the upper plate surface to the lower plate surface along the second direction, the implant structure defines a maximum implant structure height measured from the top side to the underside along the second direction, and the maximum implant structure height is greater than the maximum plate height.

3. The intervertebral implant of claim 1, wherein the plate includes an upper plate surface and a lower plate surface opposite the upper plate surface in the second direction when the plate is coupled to the implant structure, the plate defines a minimum plate height measured from the upper plate surface to the lower plate surface along the second direction, the implant structure defines a maximum implant structure height measured from the top side to the underside along the second direction, and the maximum implant structure height is greater than the minimum plate height.

4. The intervertebral implant of claim 1, wherein the hole is a first hole, the opening is a first opening, the bone screw is a first bone screw, the plate includes a second hole with a second opening defined by the front plate surface, and the second hole is configured to receive a second bone screw to secure the intervertebral implant to the other of the upper vertebral body and the lower vertebral body.

5. The intervertebral implant of claim 4, wherein the plate is configured to be coupled to the implant structure such that the second opening is positioned between the top side and the underside with respect to the second direction.

6. The intervertebral implant of claim 1, wherein the plate is configured to be coupled to the implant structure such that a portion of the plate is positioned between a first portion of the implant structure and a second portion of the implant structure, and the portion of the plate is aligned with both the first portion of the implant structure and the second portion of the implant structure with respect to the first direction such that a straight line parallel to the first direction intersects each of the portion, the first portion, and the second portion.

7. The intervertebral implant of claim 1, wherein the plate defines a projection, the implant structure defines a recess, and the projection and the recess define corresponding shapes such that the recess is configured to receive the projection to couple the plate to the implant structure.

8. The intervertebral implant of claim 7, wherein the projection is a first projection, the recess is a first recess, the plate defines a second projection, the implant structure defines a second recess, and the second projection and the second recess define corresponding shapes such that the second recess is configured to receive the second projection to couple the plate to the implant structure.

9. The intervertebral implant of claim 8, wherein the first projection and the second projection are aligned with respect to a third direction that is perpendicular to both the first direction and the second direction.

10. The intervertebral implant of claim 1, further comprising an affixation element including a head and a shaft that extends from the head, the affixation element configured to be inserted through the hole and into the one of the upper vertebral body and the lower vertebral body.

11. The intervertebral implant of claim 10, wherein the plate is coupled to the implant structure such that 1) the rear plate surface faces the implant structure 2), the opening is positioned between the top side and the underside with respect to the second direction, and 3) the plate is movable relative to the implant structure along the second direction.

12. The intervertebral implant of claim 11, wherein the affixation element is inserted through the hole such that the head is positioned within the hole and between the top side and the underside with respect to the second direction.

15. The intervertebral implant of claim 1, wherein interference between the implant structure and the plate structure further restricts movement of the plate along the implant structure in a third direction that is perpendicular to each of the first direction and the third direction.

13. An intervertebral implant configured to be inserted into a space between an endplate of an upper vertebral body and an endplate of a lower vertebral body, the intervertebral implant comprising:

an implant structure defining a front face, a rear face opposite the front face in a first direction, a top side, and an underside opposite the top side in a second direction that is perpendicular to the first direction; and

a plate including a front plate surface, a rear plate surface that is opposite the front plate surface, an upper plate surface, and a lower plate surface opposite the upper plate surface in the second direction, the plate further including a hole with an opening defined by the front plate surface, the hole being configured to receive a fastener to secure the intervertebral implant to one of the upper vertebral body and the lower vertebral body, the plate configured to be coupled to the implant structure such that

     1) the rear plate surface faces the front face of the implant structure,

     2) the opening is positioned between the top side and the underside with respect to the second direction, and

     3) the plate is movable relative to the implant structure along the second direction,

wherein the lower plate surface is opposite the upper plate surface in the second direction when the plate is coupled to the implant structure, the plate defines a maximum plate height measured from the upper plate surface to the lower plate surface along the second direction, the implant structure defines a maximum implant structure height measured from the top side to the underside along the second direction, and the maximum implant structure height is greater than the maximum plate height, and

wherein the rear face of the implant structure defines a rearmost surface of the intervertebral implant.

14. The intervertebral implant of claim 13, wherein the hole is a first hole, the opening is a first opening, the plate includes a second hole with a second opening defined by the front plate surface, the second hole is configured to receive a fastener to secure the intervertebral implant to the other of the upper vertebral body and the lower vertebral body, and the plate is configured to be coupled to the implant structure such that the second opening is positioned between the top side and the underside with respect to the second direction.