Vertebral body replacement device and method for use to maintain a space between two vertebral bodies within a spine

• US 10,201,432 B2
• Filed: 03/24/2014
• Issued: 02/12/2019
• Est. Priority Date: 10/30/2007
• Status: Active Grant

• Current Assignee: Aesculap Implant Systems LLC (Sartorius AG)
• Original Assignee: Aesculap Implant Systems LLC (Sartorius AG)
• Inventors: Refai, Daniel, Farris, Jeffrey A., Ebersole, Jeffrey T., Trischler, Cory Alan, Kistler, Gordon Paul, Wing, Charles
• Primary Examiner(s): Boles, Sameh
• Application Number:
  US14/222,862
• Publication Number:
  US 20140222151A1
• Time in Patent Office: 1,786 Days
• Field of Search: 623 1711- 1716
• 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 2/30744 End caps, e.g. for closing an endoprosthetic cavity
• CPC Class Codes: A61F 2/44 for the spine, e.g. vertebrae, spinal discs
• 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 2/4465 having a circular or kidney shaped cross-section substantially perpendicular to the axis of the spine
• CPC Class Codes: A61F 2/4611 of spinal prostheses
• CPC Class Codes: A61F 2/4637 for connecting or disconnecting two parts of a prosthesis
• CPC Class Codes: A61F 2002/2835 Bone graft implants for filling a bony defect or an endoprosthesis cavity, e.g. by synthetic material or biological material
• CPC Class Codes: A61F 2002/30235 tubular, e.g. sleeves
• CPC Class Codes: A61F 2002/30331 made by longitudinally pushing a protrusion into a complementarily-shaped recess, e.g. held by friction fit
• CPC Class Codes: A61F 2002/30364 Rotation about the common longitudinal axis
• CPC Class Codes: A61F 2002/30367 with additional means for preventing said rotation
• CPC Class Codes: A61F 2002/30372 with additional means for limiting said translation
• CPC Class Codes: A61F 2002/30405 made by screwing complementary threads machined on the parts themselves
• CPC Class Codes: A61F 2002/30411 having two threaded end parts connected by a threaded central part with opposite threads at its opposite ends, i.e. for adjusting the distance between both end parts by rotating the central part
• CPC Class Codes: A61F 2002/30433 using additional screws, bolts, dowels, rivets or washers e.g. connecting screws
• CPC Class Codes: A61F 2002/30471 connected by a hinged linkage mechanism, e.g. of the single-bar or multi-bar linkage type
• CPC Class Codes: A61F 2002/30492 using a locking pin
• CPC Class Codes: A61F 2002/30495 using a locking ring
• CPC Class Codes: A61F 2002/30507 using a threaded locking member, e.g. a locking screw or a set screw
• CPC Class Codes: A61F 2002/3052 : unrestrained in only one direction, e.g. moving unidirectionally
• CPC Class Codes: A61F 2002/30523 : by means of meshing gear teeth
• CPC Class Codes: A61F 2002/30525 : Worm gears
• CPC Class Codes: A61F 2002/3054 : about a connection axis or implantation axis for selecting any one of a plurality of radial orientations between two modular parts, e.g. Morse taper connections, at discrete positions, angular positions or continuous positions
• CPC Class Codes: A61F 2002/3055 : for adjusting length
• CPC Class Codes: A61F 2002/30579 : with mechanically expandable devices, e.g. fixation devices
• CPC Class Codes: A61F 2002/30593 : hollow
• CPC Class Codes: A61F 2002/30601 : telescopic
• CPC Class Codes: A61F 2002/30616 : Sets comprising a plurality of prosthetic parts of different sizes or orientations
• CPC Class Codes: A61F 2002/30772 : Apertures or holes, e.g. of circular cross section
• CPC Class Codes: A61F 2002/30818 : castellated or crenellated
• CPC Class Codes: A61F 2002/30841 : Sharp anchoring protrusions for impaction into the bone, e.g. sharp pins, spikes
• CPC Class Codes: A61F 2002/30892 : parallel
• CPC Class Codes: A61F 2002/30904 : serrated profile, i.e. saw-toothed
• CPC Class Codes: A61F 2002/4622 : having the shape of a forceps or a clamp
• CPC Class Codes: A61F 2002/4627 : with linear motion along or rotating motion about the instrument axis or the implantation direction, e.g. telescopic, along a guiding rod, screwing inside the instrument
• CPC Class Codes: A61F 2002/4628 : with linear motion along or rotating motion about an axis transverse to the instrument axis or to the implantation direction, e.g. clamping
• CPC Class Codes: A61F 2002/4629 : connected to the endoprosthesis or implant via a threaded connection
• CPC Class Codes: A61F 2002/4638 : Tools for performing screwing, e.g. nut or screwdrivers, or particular adaptations therefor

Abstract

A vertebral body replacement device includes a body member and a central rod member having two threaded portions and configured to be operatively associated with the body member. The device also includes a first end member and a second end member with the end members configured to threadingly engage the threaded portions of the central rod member. The body member and the two end members are further constructed to inhibit rotational movement of the two end members when the device is positioned within a space within a spine as the two end members will engage the adjacent respective vertebral bodies following rotational actuation of the central rod member causing the end members to move in an axial direction relative to the body member, thereby allowing the two end members to apply a force to the two vertebral bodies. A surgical instrument and method for using the device are also disclosed.

Claims

1. A vertebral body replacement device having a longitudinal axis and comprising:

A. a central member having a threaded portion;

B. a first end member comprising an end wall and a plurality of screw holes extending through the end wall of the first end member, the plurality of screw holes of the first end member comprising at least a first screw hole and a second screw hole, the plurality of screw holes radially arranged about a center point of the first end member, with a distance between the center point and the first screw hole defined by a first radius, and a distance between the center point and the second screw hole defined by a second radius, the first radius and the second radius extending within a plane substantially perpendicular to the longitudinal axis, with the second radius being separated from the first radius by an angle less than 180 degrees;

C. a second end member comprising an end wall and at least one screw hole extending through the end wall of the second end member;

D. a first footplate member comprising a first end surface having at least one aperture in the first end surface for attaching the first footplate member to the first end member;

E. a second footplate member comprising a second end surface having at least one aperture in the second end surface for attaching the second footplate member to the second end member; and

F. at least one locking screw for detachably connecting the first footplate member to the first end member,

the first end member being axially displaceable relative to the second end member in response to rotational motion of the central member relative to the first end member and the second end member, so as to adjust an overall length of the vertebral body replacement device, and

the first footplate member being detachably connected to the first end member in a desired orientation by inserting the at least one locking screw through the at least one aperture of the first footplate member and into one of the plurality of screw holes of the first end member,

wherein, when the at least one aperture of the first footplate member is aligned with the first screw hole of the first end member, the at least one locking screw is insertible through the at least one aperture and into the first screw hole to attach the first footplate member to the first end member in a first orientation relative to the first end member, and

wherein, when the at least one aperture of the first footplate member is aligned with the second screw hole of the first end member, the at least one locking screw is insertible through the at least one aperture and into the second screw hole to attach the first footplate member to the first end member in a second orientation relative to the first end member, the second orientation differing from the first orientation by said angle less than 180 degrees.

2. The vertebral body replacement device of claim 1, wherein the device defines a locking pin hole for receiving a threaded pin configured to lock the axial position of the first end member relative to the axial position of the second end member and fix the overall length of the device.

3. The vertebral body replacement device of claim 1, wherein the central member comprises a gear wheel portion having a tooth faced surface.

4. The vertebral body replacement device of claim 3, wherein the tooth-faced surface is arranged on a plane that is substantially perpendicular to the longitudinal axis of the vertebral body replacement device.

5. The vertebral body replacement device of claim 1, wherein the at least one locking screw comprises a plurality of locking screws for detachably connecting the first footplate member to the first end member.

6. The vertebral body replacement device of claim 1, wherein the first footplate member has a circular outer profile shape.

7. The vertebral body replacement device of claim 1, wherein the first footplate member has a non-circular outer profile shape.

8. The vertebral body replacement device of claim 1, wherein the first footplate member comprises at least one projection extending from the first end surface of the first footplate member.

9. The vertebral body replacement device of claim 8, wherein the at least one projection comprises a tooth-like projection.

10. The vertebral body replacement device of claim 1, wherein the first footplate member comprises a sidewall.

11. The vertebral body replacement device of claim 1, wherein the first end surface of the first footplate member is angled relative to the sidewall by an angulation Δ

of 0°

.

12. The vertebral body replacement device of claim 1, wherein the first end surface of the first footplate member is angled relative to the sidewall by an angulation Δ

of between 0° and

20°

.

13. The vertebral body replacement device of claim 1, further comprising a plurality of optional footplate members, each optional footplate member being interchangeable with the first footplate member or the second footplate member.

14. The vertebral body replacement device of claim 13, wherein the plurality of optional footplate members vary in outer profile shape.

15. The vertebral body replacement device of claim 13, wherein each optional footplate member comprises an end surface and a sidewall, said end surface being angled relative to said sidewall by an angulation Δ

, the plurality of optional footplate members each having a different angulation Δ

.

16. The vertebral body replacement device of claim 15, wherein the plurality of optional footplate members comprise a wide range of incrementally angled footplate members having an angulation Δ

of between 0° and

20°

.

17. The vertebral body replacement device of claim 1, wherein the plurality of screw holes in the end wall of the first end member further comprises a third screw hole.

18. The vertebral body replacement device of claim 17, wherein the plurality of screw holes are arranged uniformly around the longitudinal axis of the vertebral body replacement device.

19. The vertebral body replacement device of claim 1, wherein said angle less than 180 degrees is less than 90 degrees.

20. A vertebral body replacement device having a longitudinal axis and comprising:

A. a central member having a threaded portion;

B. a first end member comprising an end wall and a plurality of screw holes extending through the end wall of the first end member, the plurality of screw holes of the first end member comprising at least a first screw hole and a second screw hole, the plurality of screw holes radially arranged about a center point, with a distance between the center point and the first screw hole defined by a first radius, and a distance between the center point and the second screw hole defined by a second radius, the first radius and the second radius extending within a plane substantially perpendicular to the longitudinal axis, with the second radius being separated from the first radius by an angle less than 180 degrees;

C. a footplate member for directly engaging a first vertebral body, the footplate member comprising an end surface having at least one aperture arranged on the end surface for attaching the footplate member to the first end member;

D. at least one locking screw for detachably connecting the footplate member to the first end member; and

E. a second end member for directly engaging a second vertebral body,

the first end member being axially displaceable relative to the second end member in response to rotational motion of the central member relative to the first end member and the second end member, so as to adjust an overall length of the vertebral body replacement device, and

the footplate member being detachably connected to the first end member in a desired orientation by inserting the at least one locking screw through the at least one aperture of the footplate member and into one of the plurality of screw holes of the first end member,

wherein, when the at least one aperture of the footplate member is aligned with the first screw hole of the first end member, the at least one locking screw is insertible through the at least one aperture and into the first screw hole to attach the footplate member to the first end member in a first orientation relative to the first end member, and

wherein, when the at least one aperture of the footplate member is aligned with the second screw hole of the first end member, the at least one locking screw is insertible through the at least one aperture and into the second screw hole to attach the footplate member to the first end member in a second orientation relative to the first end member, the second orientation differing from the first orientation by said angle less than 180 degrees.