Fenestrated implant
Inventors
Mauldin, Richard G. • Yerby, Scott A. • Reiley, Mark A. • SCHNEIDER, Bret W.
Assignees
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Publication Number
US-12023079-B2
Publication Date
2024-07-02
Expiration Date
Abstract
The present invention relates generally to implants used in medical procedures such as bone fixation or fusion. More specifically, this application relates to fenestrated implants used in bone fixation or fusion.
Core Innovation
The invention relates to stabilizing a sacroiliac (SI) joint by applying an axially directed, non-rotational force to advance an SI joint implant laterally through an ilium, across an SI joint, and into a sacrum. The SI joint implant includes an elongate body having a longitudinal axis with a distal end and a proximal end, and a triangular cross-sectional profile within proximal and distal halves of the elongate body extending between the halves.
The elongate body includes a plurality of fenestrations and an axially extending central lumen, with the fenestrations extending to the central lumen or, in alternative variants, not reaching the central lumen. The fenestrations are configured with an angle substantially perpendicular to a side of the elongate body and have a curvilinear configuration.
The document further describes positioning the distal end of the elongate body in the sacrum and the proximal end in the ilium while the elongate body extends across the SI joint. Additional structural embodiment features include a distal end that is tapered, and fenestrated designs intended to promote bone graft or bony ingrowth while retaining structural strength, including surface features and biologic aid such as BMPs.
Claims Coverage
The partial content includes one independent claim. The independent claim contains at least two core inventive features: a stabilization method using axially directed, non-rotational advancement of a fenestrated SI joint implant laterally from ilium to sacrum; and maintaining a minimum bending strength or shear strength relative to an otherwise identical solid reference without fenestrations.
Axially directed non-rotational lateral advancement for SI joint stabilization
A method of stabilizing an SI joint by applying an axially directed, non-rotational force to advance an SI joint implant laterally through an ilium, across an SI joint, and into a sacrum, with the distal end positioned in the sacrum and the proximal end positioned in the ilium.
Triangular cross-sectional fenestrated elongate implant with central structural integrity
An implant with an elongate body having a longitudinal axis, a distal end and a proximal end, a triangular cross-sectional profile within proximal and distal halves, and a plurality of fenestrations used as the SI joint implant in the method.
Minimum bending strength or shear strength relative to solid reference without fenestrations
The elongate body has a bending strength or a shear strength of at least 0.5 relative to a reference elongate body with identical dimensions and material composition but without any fenestrations.
Fenestrations and axially extending central lumen configuration
The elongate body has an axially extending central lumen, wherein the plurality of fenestrations extend to the central lumen or, in an alternative variant, do not reach the central lumen.
Fenestration insertion geometry and shape
Each fenestration extends inwardly at an angle substantially perpendicular to a side of the elongate body, and each fenestration among the plurality has a curvilinear configuration.
Distal tapered end geometry
The elongate body includes a distal end that is tapered.
Across the independent claim and described refinements, the coverage centers on stabilizing an SI joint using axially directed, non-rotational lateral advancement of a triangular cross-sectional fenestrated elongate implant positioned from ilium into sacrum, while requiring bending strength or shear strength of at least 0.5 relative to a solid, non-fenestrated reference. Additional refinements address axially extending central lumen relationships, fenestration angle and shape, and a tapered distal end.
Stated Advantages
Maintains bending strength or shear strength at least 0.5 relative to an otherwise identical solid reference without fenestrations.
Promotes bone graft or bony ingrowth while retaining structural strength.
Provides described surface features and biologic aid such as BMPs.
Documented Applications
Stabilizing a sacroiliac (SI) joint by advancing a fenestrated SI joint implant laterally through an ilium, across the SI joint, and into a sacrum.
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