Source: https://patents.google.com/patent/US10195048B2/en
Timestamp: 2019-04-20 14:54:28+00:00

Document:
The invention is a modular interbody fusion device for fusing adjacent spinal vertebrae that is adapted to be implanted in a prepared interbody space including a first modular segment having a width including a first rail extending at least partially along one side of the width and beyond a periphery of a body portion of the first modular segment, a second modular segment having a width and slidably connected to the first rail on one side of the width and having a second rail extending at least partially along another side of the width and beyond a periphery of a body portion of the second modular segment, a third modular segment having a width and slidably connected to the second rail on one side of the width and wherein the device has an expanded position in which the second and third modular segments are extended along the first and second rails and positioned in a generally end to end configuration spaced apart by the rails prior to implantation and an implanted position in which the modular segments are positioned in a generally side by side configuration that defines a unitary body that mimics the planar shape of the vertebra such that the device contacts and supports the adjacent vertebra.
The present application is a continuation of U.S. application Ser. No. 11/974,185 filed Oct. 11, 2007; which claims the benefit of U.S. Provisional Application No. 60/860,329 filed Nov. 21, 2006, each if which is incorporated herein in its entirety by reference.
FIG. 1 is a top view of a modular interbody spacer according to an embodiment of the present invention in its inserted configuration.
FIG. 2 is a perspective view of a modular interbody spacer according to an embodiment of the present invention at a first stage of insertion.
FIG. 3 is a perspective a view of a modular interbody spacer according to an embodiment of the present invention at a second stage of insertion.
FIG. 4 is a perspective view of a modular interbody spacer according to an embodiment of the present invention at a final state of insertion.
Referring to FIG. 1, there can be seen a top view of a modular interbody spacer 100 according to an embodiment of the present invention as configured once inserted into the body. In this embodiment, modular disc prosthesis 100 comprises first 102, second 104, third 106, and fourth 108 modular segments. Interbody spacer 100 may be comprised of any suitable biomaterial, for example, a polymer, such as PEEK, a metal, such as titanium, trabecular metal, bone, or a resorbable material that may act as a scaffold for new bone growth and/or a carrier for stem cells.
In a preferred embodiment, interbody spacer 100 may be made of PEEK having holes therethrough, allowing for tissue ingrowth thus promoting bony fusion. The holes 140 may be of varying size and shape. Holes 140 may be spaced apart on spacer 100 in any manner such that the compressive modulus of spacer 100 generally corresponds to the compressive modulus of the adjacent bone. Spacer 100 may also be of varying thicknesses to achieve the desired support and/or fusion of a particular intervertebral space, such as a lordotic configuration for L5-S1 fusion.
Referring to FIG. 2, there can be seen a portion of a modular interbody spacer 100 according to the preferred embodiment of the present invention prior to insertion into the intervertebral space. In alternate embodiments, the modular interbody spacer may comprise greater or fewer numbers of modular segments and rails.
Prior to insertion, modular interbody spacer 100 further includes first 110, second 112, and third 114 rails. First modular segment 102 is rigidly attached to first rail 110 at first segment interlocking portion 116. As shown in FIG. 3, second modular segment 104 is slidably attached to first segment interlocking portion 116 at first slot 128 and rigidly attached to second rail 112 at second segment interlocking portion 118. As shown in FIG. 4, third modular segment 106 is slidably attached to second interlocking portion 118 at second slot 130 and rigidly attached to third rail 114 at third segment interlocking portion 120. Fourth modular segment 108 is slidably attached to third rail 114 at fourth slot 133.
wherein each of the first, second and third modular segments includes at least one hole therethrough, said holes adapted for tissue ingrowth from the adjacent spinal vertebrae such that the unitary body is adapted to support and stabilize fusion of the adjacent spinal vertebrae.
2. The modular fusion device of claim 1 wherein one or more of the holes may be packed with fill material.
3. The modular fusion device of claim 2 wherein the fill material is selected from the group consisting of: bone graft, bone graft substitute, agents to promote bone growth, antibiotics, anti-cancer agents, stem cells, fibroblast growth factors, bone derivative, biologically active cytokines, cytokine inhibitors, osteoconductive material, osteoinductive material and any combination thereof.
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References: Application No. 60
 Application No. 200680018453
 Application No. 2009
 Application No. 200780050196
 Application No. 201380013982
 Application No. 2008
 Application No. 200680018453
 Application No. 200780050196
 Application No. 06771111
 Application No. 2009
 Application No. 200680034261
 Application No. 2010200382
 Application No. 13761691
 Application No. 200680018453