Stabilized, laterovertically-expanding fusion cage systems
a fusion cage and laterovert technology, applied in the field of intervertebral scaffolding systems, can solve the problems of preventing the fusion of the intervertebral space from failing, unable to provide a path for bone graft insertion, and unable to fill the space surrounding the cag
Active Publication Date: 2016-07-21
INTEGRITY IMPLANTS INC
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Benefits of technology
The system effectively distributes bone graft material throughout the intervertebral space, enhances the strength and integrity of the fusion, reduces failure rates, and maintains a stable footprint without contracting in length, ensuring a larger load distribution area and minimizing backout risks.
Problems solved by technology
Unfortunately, therein lies a problem solved by the teachings provided herein.
Currently available systems can be problematic in that the methods of introducing the fusion cage and bone graft material leaves pockets in regions of the intervertebral space that are not filled with bone graft material, regions in which fusion is desired for structural support.
These pockets can create a premature failure of the fused intervertebral space due to forces that are distributed through the regions containing the pockets, for example, when the patient stands and walks.
However, this makes it difficult to insert and position properly.
Unfortunately, these types of devices have the typical graft distribution problem discussed above, in that they do not provide a path for bone graft to be inserted and fill in the space surrounding the cage or within the cage.
They have other problems as well, including that the annulotomy must be large to accommodate a large enough cage for stability, and this large opening necessitates more trauma to the patient.
Moreover, they can also create the additional problem of “backout”, in that they cannot expand laterally beyond the annulotomy to increase the lateral footprint of the cage relative to lateral dimension of the annulotomy.
Since it takes several months for the fusion to occur to completion in a patient, the devices have plenty of time to work their way out of the space through the large annulotomy.
Scaffolding systems may also suffer a lack of stability and / and or a lack of a retention of structural components in a desired expansion configuration in the intervertebral space.
Method used
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[0040]The teachings herein are directed to intervertebral scaffolding systems having a stabilizer for stabilizing and / or retaining support beams upon expansion of the scaffolding in an intervertebral disc space. The systems can have, for example, a central beam having a proximal portion having an end, a grafting portion having a top and a bottom, a distal portion having a end, a central beam axis, a graft distribution channel having an entry port at the end of the proximal portion, a top exit port at the top of the grafting portion, and a bottom exit port at the bottom of the grafting portion. These systems can also include a laterovertically-expanding frame having a lumen, a first top beam, a second top beam, a first bottom beam, and a second bottom beam, each having a proximal portion and a distal portion, and each operably connected to each other at their respective proximal portions and distal portions with connector elements to form the laterovertically-expanding frame that is ...
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An intervertebral scaffolding system is provided having a laterovertically-expanding frame operable for a reversible collapse from an expanded state into a collapsed state, the laterovertically-expanding frame having a stabilizer that slidably engages with the distal region of the laterovertically-expanding frame and is configured for retaining the laterovertically-expanding frame from a lateral movement that exceeds the expanded state. The expanded state, for example, can be configured to have an open graft distribution window that at least substantially closes upon the reversible collapse.
Description
CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application is a continuation of U.S. application Ser. No. 14 / 600,617, filed Jan. 20, 2015, which is hereby incorporated herein by reference in its entirety.BACKGROUND[0002]1. Field of the Invention[0003]The teachings herein are directed to intervertebral scaffolding systems having a stabilizer for stabilizing and / or retaining support beams upon expansion of the scaffolding in an intervertebral disc space.[0004]2. Description of the Related Art[0005]Bone grafts are used in spinal fusion, for example, which is a technique used to stabilize the spinal bones, or vertebrae, and a goal is to create a solid bridge of bone between two or more vertebrae. The fusion process includes “arthrodesis”, which can be thought of as the mending or welding together of two bones in a spinal joint space, much like a broken arm or leg healing in a cast. Spinal fusion may be recommended for a variety of conditions that might include, for example, a spondyl...
Claims
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IPC IPC(8): A61F2/44A61F2/46
CPCA61F2/4611A61F2/442A61F2/4455A61F2/447A61F2002/2835A61F2002/30471A61F2002/30476A61F2002/30556A61F2002/30579A61F2002/30545A61F2002/4677
InventorTO, JOHNFLYNN, JOHN J.
OwnerINTEGRITY IMPLANTS INC