Apparatus, systems, and methods for the fixation or fusion of bone
Inventors
Assignees
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Publication Number
US-11986397-B2
Publication Date
2024-05-21
Expiration Date
Abstract
Assemblies of one or more implant structures make possible the achievement of diverse interventions involving the fusion and/or stabilization of the SI-joint and/or lumbar and sacral vertebra in a non-invasive manner, with minimal incision, and without the necessitating the removing the intervertebral disc. The representative lumbar spine interventions, which can be performed on adults or children, include, but are not limited to, SI-joint fusion or fixation; lumbar interbody fusion; translaminar lumbar fusion; lumbar facet fusion; trans-iliac lumbar fusion; and the stabilization of a spondylolisthesis.
Core Innovation
The disclosed orthopedic fixation/fusion systems provide minimally invasive fusion and stabilization for the SI-joint and lumbar/sacral vertebra. The system uses a compression stem assembly that includes an anchor body and an elongated stem-like cannulated implant structure. The anchor body is compressed between a distal anchor and a proximal anchor, spanning a joint or fracture line while the elongated stem-like cannulated implant structure passes over the anchor body to bridge the targeted anatomy.
A fixation/fusion region is provided on an exterior surface of the elongated stem-like cannulated implant structure. The exterior surface region includes a bony in-growth/through-growth region intended to accelerate fixation/fusion, with examples including porous plasma spray and optionally hydroxyapatite or other coatings. The disclosed anchors include a distal anchor formed as a distal anchor screw or a distal anchor plate and a proximal anchor formed as a proximal nut and/or anchor washer.
The disclosed systems further describe orthopedic intervention types for the lumbar spine, including anterior lumbar interbody fusion, translaminar lumbar fusion, lumbar facet fusion, and trans-iliac lumbar fusion. For stabilization of spondylolisthesis, the disclosure includes angled implantation paths using a guide pin and concepts including cannulated drilling/pilot bore and broach-based approaches for preparing insertion paths. The implant and anchoring structures are described to accommodate multiple insertion paths and cross-sectional geometries.
Claims Coverage
Not explicitly described in patent.
Not explicitly described in patent.
Stated Advantages
Larger fusion surface area (3–4×).
Reduced invasiveness, including minimal incision and not requiring cartilage/disc removal by the procedure.
Immediate post-op stability.
Reduced need for other grafts/instrumentation.
Documented Applications
SI-joint fusion/fixation using a minimally invasive compression stem assembly.
Lumbar/sacral vertebra fusion and stabilization, including anterior lumbar interbody fusion, translaminar lumbar fusion, lumbar facet fusion, and trans-iliac lumbar fusion.
Stabilization of spondylolisthesis using angled implantation paths and the disclosed anchoring/implant concepts.
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