Fiber reinforced biocomposite threaded implants
Inventors
Preiss-Bloom, Orahn • LINDNER, Taly Pnina • UCHITEL, Ilan Oleg • KRIVORUK, Ilya
Assignees
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Publication Number
US-11317957-B2
Publication Date
2022-05-03
Expiration Date
Abstract
A threaded medical implant comprising a biocomposite, said biocomposite comprising a polymer and a plurality of reinforcement fibers, wherein a weight percentage of a mineral composition within the biocomposite medical implant is in the range of 30-60%, wherein an average diameter of said fibers is in a range of 1-100 microns, said medical implant being threaded with a plurality of threads; wherein said fibers comprise a plurality of helical fibers and a plurality of longitudinal fibers; wherein a weight to weight percent ratio of said helical to said longitudinal fibers is from 90:10 to 10:90.
Core Innovation
The invention relates to a threaded orthopedic medical implant comprising a biocomposite of a polymer and a plurality of reinforcement fibers. The biocomposite includes a mineral composition in a weight percentage range of 30–60% and the reinforcement fibers have an average diameter range of 1–100 microns. The implant is threaded with a plurality of threads and the reinforcement fibers comprise a plurality of helical fibers and a plurality of longitudinal fibers.
A helical-to-longitudinal fiber weight ratio is provided in a range of 90:10 to 10:90, establishing a mineral-fiber architecture intended to provide mechanical behavior comparable to cortical bone while enabling bone ingrowth. The disclosure positions prior implants as having insufficient strength and modulus, rapid mechanical loss, inflammation, and poor bone attachment with prior metal and bioabsorbable/biocomposite approaches.
The threaded implant further supports a helical compression screw configuration and related designs, including a straight-fiber compression screw and mixed helical/straight fiber designs, with representative manufacturing examples and measured performance results. The disclosed optional structural and thread-related features include variations in thread pitch and lead and multiple thread shapes, as well as layered architectures with discontinuous helical and longitudinal fiber arrangements, concentric regions, and reinforcement features such as chopped fibers in specified locations.
Claims Coverage
Independent claim coverage is directed to a threaded medical implant formed from a polymer mineral-fiber biocomposite with specified mineral content, fiber size, and a helical-to-longitudinal fiber weight ratio.
Threaded biocomposite implant with 30–60% mineral composition and 1–100 micron fibers
A medical implant comprising a biocomposite of a polymer and a plurality of reinforcement fibers, wherein a weight percentage of a mineral composition is 30–60% and an average diameter of said fibers is 1–100 microns.
Helical and longitudinal fiber architecture in specified helical-to-longitudinal weight ratio
The medical implant is threaded with a plurality of threads, wherein said fibers comprise a plurality of helical fibers and a plurality of longitudinal fibers, and wherein a weight percentage to weight percentage ratio of said helical to said longitudinal fibers is from 90:10 to 10:90.
The independent claim defines a threaded implant made from a polymer mineral-fiber biocomposite with 30–60 wt% mineral composition, 1–100 micron reinforcement fiber diameters, and a combined helical/longitudinal reinforcement architecture constrained to a helical-to-longitudinal weight ratio of 90:10 to 10:90.
Stated Advantages
Achieves cortical-bone-level mechanical performance while enabling bone ingrowth.
Provides sustained strength and stiffness for months.
Maintains strength retention relative to degradation and weight loss.
Documented Applications
Orthopedic medical treatment/orthopedic fixation by implanting a threaded orthopedic medical implant in a subject in need thereof.
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