UNIDIRECTIONAL DYNAMIC INTERBODY FUSION DEVICE AND METHOD OF USE

• US 20150366676A1
• Filed: 06/29/2015
• Published: 12/24/2015
• Est. Priority Date: 06/03/2011
• Status: Active Grant

• Current Assignee: Biospine LLC
• Original Assignee: Biomet Spine LLC (Zimmer Biomet Holdings, Inc.)
• Inventors: Farris, Jeffrey A., Refai, Daniel D., Emerick, Brian G., Nichols, Ross R.
• Granted Patent: US 10,143,565 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: A61F 2/4425 made of articulated components
• 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 2/4611 of spinal prostheses
• 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 2002/30398 Sliding
• CPC Class Codes: A61F 2002/304 with additional means for limiting said sliding
• CPC Class Codes: A61F 2002/30401 with additional means for preventing or locking said sliding
• CPC Class Codes: A61F 2002/30405 made by screwing complementary threads machined on the parts themselves
• 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 2002/3055 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 2002/30594 slotted, e.g. radial or meridian slot ending in a polar aperture, non-polar slots, horizontal or arcuate slots
• CPC Class Codes: A61F 2002/30601 telescopic
• CPC Class Codes: A61F 2002/30604 modular
• CPC Class Codes: A61F 2002/30607 Kits of prosthetic parts to be assembled in various combinations for forming different prostheses
• CPC Class Codes: A61F 2002/30616 Sets comprising a plurality of prosthetic parts of different sizes or orientations
• CPC Class Codes: A61F 2002/30785 : parallel
• CPC Class Codes: A61F 2002/30904 : serrated profile, i.e. saw-toothed
• CPC Class Codes: A61F 2310/00017 : Iron- or Fe-based alloys, e.g. stainless steel
• CPC Class Codes: A61F 2310/00023 : Titanium or titanium-based alloys, e.g. Ti-Ni alloys

Abstract

An interbody fusion device includes a top member, a base member, and an expansion member. The top member includes a first bone-engaging side and a threaded opening. The base member is received by the top member and includes a second bone-engaging side and an open cavity aligned with the threaded opening of the top member. The expansion member is disposed within the open cavity for rotation about an axis. The expansion member includes a threaded portion threadably engaged with the threaded opening. Rotation of the expansion member translates the first bone-engaging side away from the second bone-engaging side along the axis.

Claims

1. An interbody fusion device, the device comprising:

a top member having a first bone-engaging side and a threaded opening;

a base member received by the top member, the base member having a second bone-engaging side and an open cavity aligned with the threaded opening of the top member; and

an expansion member disposed within the open cavity for rotation about an axis, the expansion member having a threaded portion threadably engaged with the threaded opening,

wherein rotation of the expansion member translates the first bone-engaging side away from the second bone-engaging side along the axis.

2. The interbody fusion device of claim 1, further comprising a support ring coupled to the base member within the open cavity, the support ring configured to couple the expansion member to the base member.

3. The interbody fusion device of claim 2, wherein the expansion member further comprises a gear portion and a radially extending portion disposed between the gear portion and the threaded portion, the radially extending portion disposed adjacent the support ring.

4. The interbody fusion device of claim 3, wherein the gear portion includes a first side and a second side opposite the first side, the first side having a plurality of gear teeth, the second side rotatably engaging the base member.

5. The interbody fusion device of claim 3, wherein the gear portion includes a plurality of axially extending gear teeth.

6. The interbody fusion device of claim 5, wherein the base member includes a tool insertion opening in communication with the open cavity.

7. The interbody fusion device of claim 1, wherein the first bone-engaging side includes at least one first through hole, and the second bone-engaging side includes at least one second through hole aligned with the at least one first through hole.

8. The interbody fusion device of claim 1, wherein the top member includes an opening, the base member translatably received within the opening.

9. The interbody fusion device of claim 8, wherein the threaded opening opens into the opening of the top member.

18. The interbody fusion device of claim 8, wherein the threaded opening opens into the opening of the top member.

10. An interbody fusion device, the device comprising:

a top member having a first bone-engaging side and a threaded opening;

a base member received by the top member, the base member having a second bone-engaging side and an open cavity in communication with the threaded opening of the top member; and

an expansion member secured within the open cavity for rotation about an axis extending transverse to the first and second bone-engaging sides, the expansion member having a threaded portion threadably engaged with the threaded opening,

wherein rotation of the expansion member translates the top member relative to the base member along the axis.

11. The interbody fusion device of claim 10, further comprising a support ring coupled to the base member within the open cavity, the support ring configured to secure the expansion member to the base member.

12. The interbody fusion device of claim 11, wherein the expansion member further comprises a gear portion and a radially extending portion disposed between the gear portion and the threaded portion and configured to engage the support ring.

13. The interbody fusion device of claim 10, wherein the gear portion includes a first side and a second side opposite the first side, the first side having a plurality of gear teeth, the second side rotatably engaging the base member.

14. The interbody fusion device of claim 12, wherein the gear portion includes a plurality of axially extending gear teeth.

15. The interbody fusion device of claim 14, wherein the base member includes a tool insertion opening in communication with the open cavity.

16. The interbody fusion device of claim 10, wherein the first bone-engaging side includes at least one first through hole, and the second bone-engaging side includes at least one second through hole aligned with the at least one first through hole.

17. The interbody fusion device of claim 10, wherein the top member includes an opening, the base member translatably received within the opening.

19. A surgical method for maintaining a space between two vertebral bodies in a spine with an interbody fusion device having a top member, a base member, and an expansion member, comprising:

inserting the interbody fusion device into a space between two vertebral bodies;

rotating the expansion member about a first axis extending transverse to a first bone-engaging side of the top member and a second bone-engaging side of the base member;

threadably engaging the expansion member with a threaded opening of the top member; and

translating the first bone-engaging side away from the second bone-engaging side along the first axis.

20. The surgical method of claim 19, further comprising:

engaging an expansion tool with the expansion member;

rotating the expansion tool about a second axis transverse to the first axis to rotate the expansion member.