Bone implants for correcting bone defects
Inventors
Engstrand, Thomas • Bohlin, Jan • Åberg, Jonas • Engqvist, Håkan
Assignees
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Publication Number
US-10881519-B2
Publication Date
2021-01-05
Expiration Date
Abstract
A mosaic implant (2010) comprises a mesh support frame comprising a plurality of polygonal support rings (2040 A, B, C) connected by a plurality of struts (2014), and a plurality of mosaic plates (2012). The support rings are positioned within the mosaic plates; the struts extend between adjacent plates. An implant (1510) for filling a bore hole comprises a plate (1512) and a support frame (1520) having a central portion (1522) located at least partially within the plate, a polygonal outer rim (1524) having a plurality of fastening points for attaching the implant to bone surrounding a bore hole, and a plurality of arms (1530) extending between the central portion and the outer rim. The plurality of arms extend inwardly and downwardly away from the outer rim such that the central portion is located below the plane of the outer rim and the upper surface of the plate is flush with or slightly above the upper surface of the outer rim.
Core Innovation
The invention relates to mosaic bone implants for correcting bone defects. The implants include mosaic plate structures and a support frame that cooperatively position the plates and provide retention features for securing the implant in a patient.
A first configuration includes deformable implant sections with biocompatible mosaic plates interconnected by a wire or mesh support frame. The described structures include a plurality of retention eyelets for fixation, and shaping is provided using regions such as tapering and deformation zones intended to resist plate cracking.
Another configuration describes a bore-hole implant including a biocompatible plate molded over a central wire support frame with an outer rim and inwardly or obliquely arranged deformable arms. A further patient-specific approach describes rigid mosaic implants formed by additive manufacturing, including internal polygonal support rings, deformation zones on struts, retention arms with elevated countersunk eyelets, customizable plate-pattern arrangements, and optional cement or porous-metal coverings on exposed metal to support osteoconductive and osteoinductive bridging while reducing MRI interference.
Claims Coverage
Two independent claims are identified. The claim set centers on polygonal support rings in biocompatible plates, an outer wire rim connected to the support frame, and retention eyelets for securing the implant, with a second independent claim adding deformable retention arms and an angular constraint on wire segments.
Polygonal-ring mesh support frame with interconnected struts
A mesh support frame comprising a plurality of polygonal support rings connected to one another by a plurality of struts, with the support frame having a periphery.
Biocompatible plates with positioned polygonal support rings
A plurality of biocompatible plates, wherein the polygonal support rings are positioned within the plates, with the struts extending between adjacent plates.
Irregular non-polygonal outer wire rim connected to the periphery
An outer wire rim extending about and connected to the periphery of the support frame, wherein the outer wire rim has an irregular, non-polygonal shape.
Outwardly spaced retention eyelets connected to and secured via rim
A plurality of retention eyelets connected to and spaced outwardly away from the rim, the eyelets adapted for securing the implant in a patient.
Rigid unitary mesh support frame with angled wire segments
A rigid mesh support frame comprising a unitary structure of interconnected wire segments forming polygonal support rings connected by struts, with the wire segments angled with respect to an imaginary planar base at an angle greater than 45 degrees.
Deformable retention arms carrying retention eyelets connected to outer rim
Retention eyelets provided on retention arms that extend outwardly away from and are connected to the outer rim, wherein the retention arms are deformable.
The independent claims cover mosaic implant structures that combine polygonal-ring mesh support frames with biocompatible plates, an outer wire rim connected to the support frame, and fixation via retention eyelets. The second independent claim further adds deformable retention arms and an angular relationship of the wire segments relative to an imaginary planar base.
Stated Advantages
Osteoconductive and osteoinductive bridging is supported by optional cement or porous-metal coverings on exposed metal.
Reduced MRI interference is provided by the optional cement or porous-metal covering on exposed metal.
Documented Applications
Correcting bone defects using an implant that is provided, positioned at the bone defect site, and secured in place.
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