EXPANDABLE VERTEBRAL BODY REPLACEMENT DEVICE AND METHOD

• US 20190314170A1
• Filed: 05/28/2019
• Published: 10/17/2019
• Est. Priority Date: 11/28/2016
• Status: Active Grant

• Current Assignee: MUSC Foundation For Research Development (State of South Carolina)
• Original Assignee: MUSC Foundation For Research Development (State of South Carolina)
• Inventors: SEMLER, Mark Evald, FRANKEL, Bruce, RUSCITO, Joseph, HAPSTACK, Christopher
• Granted Patent: US 11,278,424 B2
• Time in Patent Office: Days
• CPC Class Codes: A61F 2/44 for the spine, e.g. vertebrae, spinal discs
• 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 2/4611 of spinal prostheses
• CPC Class Codes: A61F 2002/30224 cylindrical
• CPC Class Codes: A61F 2002/30405 made by screwing complementary threads machined on the parts themselves
• CPC Class Codes: A61F 2002/30523 by means of meshing gear teeth
• CPC Class Codes: A61F 2002/3055 for adjusting length
• CPC Class Codes: A61F 2002/30556 for adjusting thickness
• 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 2002/30818 castellated or crenellated
• 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

Abstract

Expandable vertebral body implants, systems, instruments, and methods of assembly and using the implants, systems, and instruments are disclosed. The vertebral body implant includes a body with a first end and a second end, a first rotating member rotatably coupled to the first end, wherein an end includes a plurality of first notches inset into the first rotating member, a second rotating member rotatably coupled to the second end, wherein an end includes a plurality of second notches inset into the second rotating member, a first extension member moveably coupled to the first end, and a second extension member moveably coupled to the second end. The expandable cage system comprises a vertebral body implant and an insertion instrument. Methods for assembling and using the vertebral body implants and instruments are also disclosed.

Claims

1. A vertebral body implant, comprising:

a body with a first end and a second end;

a first rotating member rotatably coupled to the first end, wherein an end includes a plurality of first notches inset into the first rotating member;

a second rotating member rotatably coupled to the second end, wherein an end includes a plurality of second notches inset into the second rotating member;

a first extension member moveably coupled to the first end; and

a second extension member moveably coupled to the second end.

2. The vertebral body implant of claim 1, wherein the body further comprises:

at least one threaded aperture positioned at a midpoint between the first end and the second end;

at least one first locking hole positioned superior to the at least one aperture; and

at least one second locking hole positioned inferior to the at least one aperture.

3. The vertebral body implant of claim 2, further comprising:

a locking plate with a first post positioned in the first locking hole, a second post positioned in the second locking hole, and a bore located between the first post and the second post, wherein the bore is concentric to the at least one threaded aperture;

a threaded fastener;

wherein the threaded fastener extends through the bore of the locking plate and engages the threads of the threaded aperture of the body; and

wherein engaging the threads of the threaded aperture positions the first post against the first extension member and positions the second post against the second extension member preventing further extension.

4. The vertebral body implant of claim 2, further comprising:

a locking member, wherein the locking member comprises;

a body portion with a first side and a second side;

guide pins extending away from the first side of the body portion; and

a through hole extending through the body portion from the first side to the second side and positioned between the guide pins;

wherein the first side of the body portion of the locking member engages an interior surface of the body of the vertebral body implant; and

a fastener inserted through the body of the vertebral body implant and coupled to the through hole of the locking member.

5. The vertebral body implant of claim 2, wherein the body further comprises:

at least two solid faces; and

at least two bone grafting windows;

wherein the solid faces and bone grafting windows alternate around the body; and

wherein at least one solid face of the at least two solid faces contains a threaded aperture, a first locking hole and a second locking hole.

6. The vertebral body device of claim 1, wherein the first rotating member comprises:

a center opening forming an interior surface, wherein the interior surface comprises;

threads positioned on the interior surface; and

wherein the plurality of first notches open toward an inferior end; and

wherein the second rotating member comprises;

a center opening forming an interior surface, wherein the interior surface comprises;

threads positioned on the interior surface; and

wherein the plurality of second notches are open toward a superior end.

7. The vertebral body device of claim 6, wherein the first extension member comprises:

a top portion;

at least one first leg member extending away from the top portion, wherein the at least one first leg member comprises;

threads positioned on an exterior surface of the at least one first leg member and configured to engage the threads on the interior surface of the first rotating member; and

a protrusion positioned on a second end of the at least one first leg member and configured to engage a stop member coupled to the body; and

at least one first support member positioned between and coupled to the at least one first leg member;

wherein the second extension member comprises;

a bottom portion;

at least one second leg member extending away from the bottom portion, wherein the at least one second leg member comprises;

threads positioned on an exterior surface of the at least one second leg member and configured to engage the threads on the interior surface of the second rotating member; and

a protrusion positioned on a second end of the at least one second leg member and configured to engage a pin coupled to the body; and

at least one second support member positioned between and coupled to the at least one second leg member.

8. An expandable cage system, comprising:

a vertebral body device, comprising;

a body with a first end and a second end, the body comprising;

at least one aperture positioned on the body along a midpoint between the first end and the second end;

at least one first locking hole positioned superior to the at least one aperture; and

at least one second locking hole positioned inferior to the at least one aperture;

a first rotating member coupled to the first end;

a second rotating member coupled to the second end;

a first extension member moveably coupled to the first end; and

a second extension member moveably coupled to the second end; and

an insertion instrument, wherein the insertion instrument is sized to be placed around the at least one aperture, the at least one first locking hole, and the at least one second locking hole.

9. The expandable cage system of claim 8, wherein the insertion instrument comprises:

a gripping member;

a compression sleeve sized to engage the gripping member; and

at least one rotating member sized to receive the compression sleeve and gripping member.

10. The expandable cage system of claim 9, wherein the body further comprises:

at least one opening positioned on each side of the at least one aperture, wherein the gripping member is inserted into the at least one opening on each side of the aperture and wherein the gripping member engages a side of each of the at least one openings.

11. The expandable cage system of claim 9, wherein the at least one rotating member comprises:

a first end having a plurality of projections positioned around the circumference of the first end.

12. The expandable cage system of claim 9, wherein the at least one rotating member comprises:

a first end having a first semi-circular protrusion and a plurality of projections positioned around the first protrusion on the first end.

13. The expandable cage system of claim 12, wherein the at least one rotating member comprises:

a second end having a second semi-circular protrusion extending away from the second end and aligned with the first semi-circular protrusion around the circumference of the rotating member.

14. A method of using an expandable cage system, comprising:

obtaining a vertebral body implant, the vertebral body implant comprising;

a body with a first end and a second end;

a first rotating member rotatably coupled to the first end;

a second rotating member rotatably coupled to the second end;

a first extension member moveably coupled to the first end; and

a second extension member moveably coupled to the second end;

obtaining an insertion instrument;

coupling the vertebral body implant to the insertion instrument;

inserting the vertebral body implant into a patient between two vertebral bodies;

expanding the vertebral body implant; and

removing the insertion instrument.

15. The method of claim 14, wherein the insertion instrument comprises:

a gripping member;

a compression sleeve sized to engage the gripping member; and

at least one rotating member sized to receive the compression sleeve and gripping member.

16. The method of claim 15, wherein the method further comprises:

inserting a locking member into the body of the vertebral body implant.

17. The method of claim 15, wherein expanding the vertebral body implant comprises:

rotating the rotating member in a first direction to engage and rotate the first rotating member, wherein rotating the first rotating member translates the coupled first extension member to increase a height of the vertebral body device.

18. The method of claim 14, wherein expanding the vertebral body implant comprises:

expanding only one of the first extension member and the second extension member.

19. The method of claim 15, wherein the at least one rotating member comprises:

a first end having a semi-circular protrusion and a plurality of projections positioned around the protrusion on the first end, wherein the semi-circular protrusion engages one of the first rotating member and the second rotating member to expand one of the first extension member and the second extension member.

20. The method of claim 14, wherein inserting a locking member into the body of the vertebral body implant comprises:

obtaining a locking plate with a first post, a second post and a bore located between the first post and the second post;

inserting a threaded fastener through the bore in the locking plate and a threaded opening in the body of the vertebral body implant; and

tightening the threaded fastener to insert the first post into an opening superior to the bore and to insert the second post into an opening inferior to the bore, wherein the first post engages the first extension member and the second post engages the second extension member to secure the vertebral body implant in an expanded position.