Bone implants and methods for correcting bone defects
Inventors
Engstrand, Thomas • Engqvist, Håkan • Ibrahim, Ghanim • Åberg, Jonas
Assignees
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Publication Number
US-10898332-B2
Publication Date
2021-01-26
Expiration Date
Abstract
A bone implant including a wire mesh support frame (120A) having a plurality of interconnected wire members and at least two fastening points in the form of retention eyelets (140A) connected to the support frame by deformable retention arms (138A), and a biocompatible plate (112) formed about the support frame, the plate having at least two open cavities (116) therein, wherein each of the retention arms extends out of the plate from or into one of the open cavities. A method for correcting a bone defect in a patient, a mesh support frame for use in a bone implant, and a method of fabricating a bone implant are also provided.
Core Innovation
A bone implant is described that includes a wire mesh support frame with a plurality of interconnected wire members and at least two fastening points comprising retention eyelets. Each retention eyelet is connected to the support frame by at least one deformable retention arm that comprises one of the wire members. A biocompatible plate is formed about the support frame and includes at least two open cavities therein with a wall.
The retention arms extend out of the plate from or into one of the open cavities such that the retention eyelets are located external to the plate for use in securing the implant to bone. The open cavities are configured to provide a gap between each deformable retention arm and the wall of the open cavity from or into which the deformable retention arm extends. This configuration reduces the risk of plate cracking when the retention arms are deformed.
Craniofacial implant embodiments are described for paranasal, zygoma, supraorbital, and mandibular applications, using standardized mesh frames modified for a patient and a biocompatible plate molded about the frame. Plate fabrication approaches include forming open cavities and oversized apertures adjacent each retention arm so that retention arms and portions of the rim/eyelets remain cement-free or "float," thereby maintaining the designed gap behavior. Variants include internal retention configurations with eyelets within the plate and through-thickness bores aligned with the eyelets, and embodiments with textured support surfaces.
Claims Coverage
The independent claim coverage centers on one independent claim describing a craniofacial-type bone implant structure with a wire mesh support frame, retention eyelets on deformable retention arms, and a biocompatible plate having open cavities configured with a gap to reduce plate cracking risk; inventive feature constraints are further refined in dependent claims.
Wire mesh support frame with retention eyelets on deformable retention arms
A bone implant comprising a wire mesh support frame comprising a plurality of interconnected wire members, and at least two fastening points comprising retention eyelets, each connected to the support frame by at least one deformable retention arm comprising one of said wire members.
Biocompatible plate with open cavities and cavity-wall gap for reduced cracking
A biocompatible plate formed about the support frame, the plate having at least two open cavities therein with a wall, wherein each retention arm extends out of the plate from or into one of said open cavities such that said retention eyelets are located external to the plate for use in securing the implant to bone, and wherein the open cavities are configured such that a gap is provided between each deformable retention arm and the wall of the open cavity from or into which the deformable retention arm extends to reduce the risk of plate cracking when the retention arms are deformed.
Across the independent claim, the implant combines a wire mesh support frame with retention eyelets carried by deformable retention arms, and a biocompatible plate formed about the frame with open cavities configured to maintain a gap between the arms and cavity walls, thereby reducing plate cracking when the retention arms are deformed.
Stated Advantages
Reducing the risk of plate cracking when the retention arms are deformed.
Documented Applications
Craniofacial bone implant embodiments including paranasal, zygoma, supraorbital, and mandibular implants.
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