Deployable member for use with an intervertebral cage

• US 8,545,562 B1
• Filed: 03/31/2010
• Issued: 10/01/2013
• Est. Priority Date: 07/02/2007
• Status: Active Grant

• Current Assignee: Theken Spine LLC (Orthofix Medical Inc.)
• Original Assignee: Theken Spine LLC (Orthofix Medical Inc.)
• Inventors: Materna, Peter A., Bruffey, James, Hartzell, Bret, Davison, Dale G.
• Primary Examiner(s): WOODALL, NICHOLAS W
• Application Number:
  US12/752,032
• Time in Patent Office: 1,280 Days
• Field of Search: 623 1711- 1716
• US Class Current: 623/17.11
• 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 2002/2817 Bone stimulation by chemical reactions or by osteogenic or biological products for enhancing ossification, e.g. by bone morphogenetic or morphogenic proteins [BMP] or by transforming growth factors [TGF]
• 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 2002/30357 Stepped cylinders, i.e. having discrete diameter changes
• CPC Class Codes: A61F 2002/30365 with additional means for limiting said rotation
• CPC Class Codes: A61F 2002/30367 with additional means for preventing said rotation
• CPC Class Codes: A61F 2002/30433 using additional screws, bolts, dowels, rivets or washers e.g. connecting screws
• CPC Class Codes: A61F 2002/30482 using a locking cam
• CPC Class Codes: A61F 2002/305 Snap connection
• CPC Class Codes: A61F 2002/30517 using a locking plate
• CPC Class Codes: A61F 2002/30522 releasable, e.g. using a releasable ratchet
• 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 2002/30576 with extending fixation tabs
• CPC Class Codes: A61F 2002/30579 with mechanically expandable devices, e.g. fixation devices
• 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 2002/30774 internally-threaded
• CPC Class Codes: A61F 2002/30785 parallel
• CPC Class Codes: A61F 2002/30787 inclined obliquely with respect to each other
• CPC Class Codes: A61F 2002/30822 : Circumferential grooves
• CPC Class Codes: A61F 2002/30825 : arcuate
• CPC Class Codes: A61F 2002/30828 : parallel
• CPC Class Codes: A61F 2002/30845 : with cutting edges

Abstract

An implant may provide a body capable of being fit in an intervertebral space and a spin-plate rotatable with respect to the body. The spin-plate may a blade. The blade may possess grooves in its flat faces, or may be provided with an overhang. The path of the overhang or groove may be such that as the spin-plate advances in its rotation, a vertebra engaged with the blade is drawn toward the body of the implant. Pins may be placed in adjacent vertebrae such as to engage the spin-plate. Surgical methods are also described.

Claims

1. A spinal cage and spin-plate assembly, comprising:

a spinal cage dimensioned to fit between adjacent vertebrae and having a central opening therethrough and having a cage flat inner surface along a portion of said central opening; and

a spin-plate assembled to said spinal cage and rotatable with respect thereto, said spin-plate having a rotational axis, said spin-plate having a blade having a first side surface lying at least approximately in a spin-plate plane that is at least approximately perpendicular to said rotational axis and having a second side surface opposed to said first side surface, wherein said second side surface is adjacent to said cage flat inner surface, said spin-plate blade having a blade leading edge facing forward with respect to a direction of rotation about said rotational axis to deploy said spin-plate out of said spinal cage, at least a portion of said blade leading edge forming substantially a straight line, said blade leading edge having a taper in at least one direction,

wherein said spin-plate further comprises an overhang at a radially outer region of said blade extending from said first side surface away from said cage flat inner surface at least partially along a direction of said rotational axis but not extending from said second side surface,

wherein said overhang comprises a first surface and a second surface, wherein said first surface faces radially inward with respect to said rotational axis and said second surface faces radially outward, wherein said overhang comprises an overhang leading edge facing forward with respect to said direction of rotation about said rotational axis to deploy said spin-plate out of said spinal cage, and comprises an overhang trailing edge opposed to said overhang leading edge, wherein a first distance between said first surface and said axis of rotation measured at said leading edge is unequal to a second distance between said first surface and said axis of rotation measured at said trailing edge.

2. The spinal cage and spin-plate assembly of claim 1, wherein said overhang is located at an outer radial edge of said spin-plate.

3. The spinal cage and spin-plate assembly of claim 1, wherein a length of said overhang leading edge is equal to a length of said overhang trailing edge, as measured from said first side surface along said axis of rotation.

4. The spinal cage and spin-plate assembly of claim 1, wherein a length of said overhang leading edge is less than a length of said overhang trailing edge, as measured from said first side surface along said axis of rotation.

5. The spinal cage and spin-plate assembly of claim 1, wherein said overhang is tapered along one or more dimensions.

6. The spinal cage and spin-plate assembly of claim 1, wherein said overhang has a thickness in a radial direction with respect to said rotational axis, and said thickness varies continuously, being smaller near said overhang leading edge and larger near said overhang trailing edge.