Expandable and adjustable lordosis interbody fusion system

{
  "publication_number": "US9889019B2",
  "country": "US",
  "kind": "B2",
  "title": "Expandable and adjustable lordosis interbody fusion system",
  "abstract": "An expandable housing for an interbody fusion system has movable tapered external helical threaded members that travel along tracking to operably engage against the top and bottom shell members, urging them apart to cause expansion in the height of the housing. In an embodiment, the tapered members are disposed in a dual arrangement such that independent engagement of the tapered members along lateral portions of the top and bottom shells cause an angular tilt to the exterior surface of the housing when the tapered members are moved to different degrees. This function permits adjustment in the angular relationship between adjacent vertebrae and assists the lordotic adjustment of the patient's spine. When the functions of the device are used in combination by the surgeon, the device provides an effective tool for in situ adjustment when performing lateral lumbar interbody fusion.",
  "claims": [
    "1. A spinal implant device for placement between vertebral bodies, the device comprising: an expandable shell; at least one wedge member; at least one drive shaft; and the expandable shell comprising a top member and a bottom member separate from each other, at least the bottom member having tracking for receiving the at least one wedge member, the at least one drive shaft engaging with the top member, the bottom member, and the at least one wedge member for moving the at least one wedge member along the tracking, the at least one wedge member engaging the top member and the bottom member, the at least one wedge member comprising a tapered configuration having an external helical thread, whereby the top member and bottom member move relative to each other in response to rotation of the at least one wedge member along the tracking to effect an expansion of the shell, the tracking comprising a cascading series of risers on interior surfaces of each of the top and bottom members, the cascading series of risers comprising individual riser members increasing in height along the interior surfaces and delivering corresponding staggered spaces in between the individual riser members so that the individual riser members and corresponding spaces on the top member overlap the individual riser members and corresponding spaces on the bottom member, permitting an interlocking engagement of the two members when the two members are in a contracted position, and wherein the tracking is configured to increase a longitudinal position of the at least one wedge member along and relative to the interior surfaces of the top and bottom members within the shell as it travels along the tracking whereby the at least one wedge member engages the top and bottom members to selectively contact the shell.",
    "2. The spinal implant device of claim 1 in which the thread of the at least one wedge member is received in the staggered spaces between the individual riser members for guiding the at least one wedge member along the tracking, the at least one wedge member being capable of engaging with a plurality of adjacent riser members of different heights simultaneously, a minor diameter of the at least one wedge member engaging top edges of the individual riser members.",
    "3. The spinal implant device of claim 1, wherein the height of the cascading series of risers increases from a middle portion of the shell to an edge.",
    "4. The spinal implant device of claim 1, wherein the height of the cascading series of risers increases from a middle portion of the shell to a first edge and from the middle portion of the shell to a second edge."
  ],
  "description_excerpt": "The invention relates to surgical procedures and apparatus for treating lumbar back pain.\n\nLumbar spinal fusion is a surgical procedure to correct problems relating to the human spine. It generally involves removing damaged disc and bone from between two vertebrae and inserting bone graft material that promotes bone growth. As the bone grows, the two vertebrae join, or fuse, together. Fusing the bones together can help make that particular area of the back more stable and help reduce problems related to nerve irritation at the site of the fusion. Fusions can be done at one or more segments of the spine.\n\nInterbody fusion is a common procedure to remove the nucleus pulposus and or the annulus fibrosus that compose the intervertebral disc at the point of the back problem and replace it with a cage configured in shape and dimension to restore the distance between adjacent vertebrae to that of a proper condition. Surgical approaches to implement interbody fusion vary, and access to the patient's vertebral column can be made through the abdomen or back. One other surgical method for accomplishing lumbar spinal fusion in a less invasive way involves accessing the vertebral column through a small incision on the side of the body. This procedure is known as lateral lumbar interbody fusion.\n\nOnce the intervertebral disc is removed from the body during the lateral lumbar interbody fusion, the surgeon typically forces different trial implants between the vertebral endplates of the specific region to determine the appropriate size of the implant for maintaining a distance between the adjacent vertebrae.",
  "cpc": [
    "A61F 2/447",
    "A61F 2/4455",
    "A61F 2/4465",
    "A61F 2/4611",
    "A61F 2002/30462",
    "A61F 2002/30507",
    "A61F 2002/30523",
    "A61F 2002/30525",
    "A61F 2002/30527",
    "A61F 2002/30538",
    "A61F 2002/30556",
    "A61F 2002/30566",
    "A61F 2002/4627"
  ],
  "ipc": [
    "A61F 2/44",
    "A61F 2/46"
  ],
  "assignees": [
    "SpineEX Inc"
  ],
  "inventors": [
    "Andrew Rogers",
    "Robyn BURROWS-OWNBEY"
  ],
  "filing_date": "2014-08-29",
  "publication_date": "2018-02-13",
  "grant_date": "2018-02-13",
  "priority_date": "2013-08-29",
  "application_number": "US-201414473200-A",
  "family_id": "52584288",
  "cited_by_count": 65,
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}