Expandable intervertebral implant, system, kit and method

Patent metadata

Field	Value
Publication number	US-2016256291-A1
Application number	US-201514640264-A
Country	US
Kind code	A1
Filing date	Mar 6, 2015
Priority date	Mar 6, 2015
Publication date	Sep 8, 2016
Grant date	—

Abstract

An implant includes a first plate and a second plate, a first wedge member and a second wedge member spaced from the first wedge member that couple the first and second plates together. The first and second wedge members configured to translate along the first and second plates from a first contracted configuration into a second expanded configuration. The implant includes an actuation member coupled to the first wedge member and the second wedge member. The actuating member defines a flange extending toward the first and second plates. The actuation member configured to move the first and second wedge members from the first contracted configuration into the second expanded configuration so that the first and second plates separate from each other.

First claim

What is claimed:

1 . An expandable implant for insertion in an intervertebral space defined between a first vertebral body and a second vertebral body, the implant comprising:
a first bone contacting surface and a second bone contacting surface opposite the first bone contacting surface along a transverse direction; an insertion end and a trailing end opposite the insertion end along a longitudinal direction that is perpendicular to the transverse direction; first and second side surfaces opposite each other along a lateral direction that is perpendicular to both the transverse direction and the longitudinal direction; a first intermediate surface that extends from the first side surface to the first bone contacting surface, wherein the first intermediate surface is smooth and oblique to each of the first side surface and the first bone contacting surface; and a second intermediate surface that extends from the second side surface to the second bone contacting surface, wherein the second intermediate surface is smooth and oblique to each of the first side surface and the first bone contacting surface, wherein the first and second bone contacting surfaces are movable away from each other from a collapsed configuration to an expanded configuration.

2 . The expandable implant as recited in claim 1 , wherein the first and second intermediate surfaces are mirror images of each other.

3 . The expandable implant as recited in claim 1 , wherein the first and second intermediate surfaces are parallel to each other.

4 . The expandable implant as recited in claim 1 , wherein the first intermediate surface defines a straight linear interface with the first side surface, and a curved interface with the first bone contacting surface.

5 . The expandable implant as recited in claim 4 , wherein the first intermediate surface defines a midpoint with respect to the longitudinal direction, wherein the curved interface is symmetrical about the midpoint.

6 . The expandable implant as recited in claim 5 , wherein the second intermediate surface defines a straight linear interface with the second side surface, and a curved interface with the second bone contacting surface

7 . The expandable implant as recited in claim 6 , wherein the second intermediate surface defines a midpoint with respect to the longitudinal direction, wherein the curved interface of the second intermediate surface is symmetrical about the midpoint of the second intermediate surface.

8 . The expandable implant as recited in claim 1 , wherein the first intermediate surface is tapered toward the second side surface as it extends from the first side surface toward the first bone contacting surface, and the second intermediate surface is tapered toward the first side surface as it extends from the second side surface toward the second bone contacting surface.

9 . The expandable implant as recited in claim 1 , wherein the first and second bone contacting surfaces are textured.

10 . The expandable implant as recited in claim 1 , wherein the first and second intermediate surfaces are spaced apart a first distance when the implant is in the collapsed configuration, the first and second bone contacting surfaces are spaced apart a second distance when the implant is in the expanded configuration, and the second distance is greater than the first distance.

11 . The expandable implant as recited in claim 1 , further comprising:
first and second plates that define the first and second bone contacting surfaces, respectively; a first wedge member and a second wedge member spaced from the first wedge member along the longitudinal direction, the first and second wedge members coupled between the first and second plates, wherein the first and second wedge members are configured to translate away from each other so as to cause the implant to move from the contracted configuration to the expanded configuration; and a stop member disposed at one of the insertion and trailing ends, the stop member configured to abut a respective one of the first and second wedge members so as to prevent the first and second plates from further moving away from each other.

12 . The expandable implant as recited in claim 11 , further comprising an actuation member that includes a threaded shaft that is threadedly coupled to each of the first and second wedge members, wherein rotation of the threaded shaft causes the first and second wedge members to translate along the longitudinal direction, wherein the stop member projects radially out with respect to the threaded shaft.

13 . The expandable implant as recited in claim 1 , wherein the stop member is threaded onto the threaded shaft.

14 . A method for inserting an intervertebral implant into an intervertebral space defined between a first vertebral body and a second vertebral body, the method comprising:
inserting the intervertebral implant into the intervertebral space, such that a first side surface of the intervertebral implant abuts the first vertebral body, and a second side surface of the intervertebral implant abuts the second vertebral body; rotating the intervertebral implant in a direction of rotation about an axis of rotation such a first intermediate surface oblique to the first side surface contacts the first vertebral body, and a second intermediate surface oblique to the second side surface contacts the second vertebral body; further rotating the intervertebral implant in the direction of rotation about the axis of rotation such that a first bone contacting surface contacts the first vertebral body, and a second bone contacting surface contacts the second vertebral body, wherein the first intermediate surface extends from the first side surface to the first bone contacting surface, and the second intermediate surface extends from the second side surface to the second bone contacting surface; and expanding the intervertebral implant from a collapsed configuration whereby the first and second bone contacting surfaces are spaced from each other a first distance, to an expanded configuration whereby the first and second bone contacting surfaces are spaced from each other a second distance greater than the first distance.

15 . The method as recited in claim 14 , wherein the expanding step comprises achieving the second distance greater than a distance between the first and second intermediate surfaces when the implant is in the collapsed configuration.

16 . The method as recited in claim 14 , wherein the expanding step further comprises rotating a threaded shaft about a respective axis of rotation so as to cause the implant to move from the collapsed configuration to the expanded configuration.

17 . The method as recited in claim 16 , wherein the step of rotating the threaded shaft further comprises causing first and second wedge members to move away from each other toward a stop member that prevents further rotation of the threaded shaft in the expansion direction.

18 . The method as recited in claim 16 , wherein the axis of rotation of the threaded shaft is coincident with the axis of rotation during the rotating step and the further rotating step.

19 . The method as recited in claim 14 , wherein the first rotating step comprises substantially removing the first and second side surfaces from contact with the first and second vertebral bodies, respectively, and bringing the first and second intermediate surfaces into surface contact with the first and second vertebral bodies, respectively.

20 . The method as r

Assignees

• Depuy Synthes Products Inc

Inventors

• Miller William

Classifications

• A61F2002/30405

  made by screwing complementary threads machined on the parts themselves · CPC title

• A61F2/447 Primary

  substantially parallelepipedal, e.g. having a rectangular or trapezoidal cross-section · CPC title

• A61F2/4603

  for insertion or extraction of endoprosthetic joints or of accessories thereof · CPC title

• A61F2002/30593

  hollow · CPC title

• A61F2002/30828

  parallel · CPC title