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High-strength absorbable wire composited internal fixation implantable device and preparation method thereof

A high-strength, wire-based technology, used in internal fixators, fixators, internal bone synthesis, etc., can solve problems such as difficulty meeting mechanical safety requirements

Inactive Publication Date: 2013-01-16
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The composite material has a wider range of use and better strength and safety than the currently clinically used absorbable polylactic acid orthopedic devices, but it is difficult to meet the mechanical safety requirements for stable fixation in the fixation of large-loaded fractures with higher strength requirements

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] AZ31B magnesium alloy is drawn and processed into a magnesium alloy wire with a diameter of φ0.32mm; 10g / L sodium silicate and 2g / L NaOH are used as the micro-arc oxidation electrolyte system, the magnesium alloy wire is immersed in it, and 400V is applied Voltage, micro-arc oxidation treatment for 10 minutes, so that a layer of 10 μm thick magnesium oxide bioceramic bottom layer is formed on the surface in situ; by weight percentage, magnesium alloy wire accounts for 80%, and polylactic acid with a molecular weight of 200,000 accounts for 20%. Weigh an appropriate amount of magnesium alloy wire and polylactic acid polymer material, and arrange the magnesium alloy wire in a directional and dispersed manner, and evenly fix it in the injection mold; extrude and inject the high-temperature molten polylactic acid polymer material into the injection mold In the mold, it is injected and solidified to form a rod, and finally, it is processed into orthopedic fixation devices suc...

Embodiment 2

[0044] The AE21 magnesium alloy is drawn and processed into a magnesium alloy wire with a diameter of φ0.2mm; 10g / L sodium silicate, 3g / L hydroxyapatite nanopowder, and 2g / L NaOH are used as the micro-arc oxidation electrolyte system, Immerse the magnesium alloy wire in it, apply a voltage of 400V, and carry out micro-arc oxidation treatment for 15 minutes, so that a layer of 20 μm thick magnesium oxide and hydroxyapatite composite ceramic bottom layer is formed on the surface in situ; The material accounts for 70% and the polylactic acid with a molecular weight of 500,000 accounts for 30%. Weigh an appropriate amount of magnesium alloy wire and polylactic acid polymer material, and weave the magnesium alloy wire into a two-dimensional mesh structure, and the magnesium alloy wire The two-dimensional braided wire structure is placed in the preform mold, and then the polylactic acid solution or high-temperature molten polylactic acid is poured into the preform mold, and then drie...

Embodiment 3

[0046] The MB8 magnesium alloy is drawn and processed into a magnesium alloy wire with a diameter of φ0.4mm; in the electrolyte system containing 6g / L hydroxyapatite nanopowder, electrodeposit 20μm thick on the surface of the magnesium alloy wire by electrodeposition technology The bottom layer of hydroxyapatite bioceramics; according to the weight percentage, magnesium alloy wire accounts for 60%, and polylactic acid with a molecular weight of 700,000 accounts for 40%. The wire is woven into a three-dimensional tube network structure, and the three-dimensional braided structure of the magnesium alloy wire is fixed in the injection mold; the polylactic acid polymer material in the high-temperature molten state is extruded and injected into the injection mold, and then injected and solidified to form a rod , Finally, it is processed into orthopedic fixation devices such as intramedullary nails, screws, and bone nails by mechanical processing.

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Abstract

The invention relates to a high-strength absorbable wire composited internal fixation implantable device and a preparation method of the device, in particular to an internal fixation implantable device taking high-strength magnesium alloy wires in high content as a basal body, wherein the high-strength magnesium alloy wires are bonded and cured at a high temperature by low-content binder polylactic acid polymers and are arranged in a directional dispersion way or in a two-dimension weaving structure or three-dimension weaving structure, and the binder polylactic acid polymers account for 5%-49.9% of the total amount and the magnesium alloy wires account for 50.1%-95% of the total amount according to the weight percentage. The high-strength absorbable wire composited internal fixation implantable device is closer to the magnesium alloy on the aspect of strength, can meet the mechanism safety requirements for large-load fracture fixation with higher strength requirement, and has the advantages of both controllable uniform internal absorption, slow and less hydrogen degradation and separation, etc., thereby being particularly applicable to clinics like departments of bone traumatology, department of bone defect repair, plastic and beauty operations and the like with high strength requirement and large size.

Description

technical field [0001] The invention relates to a high-strength absorbable wire composite bone internal fixation implant device, in particular to a high-strength magnesium alloy wire as a matrix, and a low-content binder polylactic acid polymer is passed between the magnesium alloy wires. Materials are bonded and cured at high temperature for intraosseous fixation and implantation, in which the magnesium alloy wires are arranged in a directional and dispersed arrangement or in a two-dimensional braided structure or a three-dimensional braided structure, with high strength and controllable uniform absorption rate in the body , decomposing hydrogen and reducing the amount of relaxation, etc., especially suitable for high-strength, large-volume orthopedic trauma surgery, bone defect repair surgery, and orthopedic implants for plastic surgery, belonging to the technical field of medical devices. Background technique [0002] At present, the most commonly used orthopedic implants...

Claims

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Application Information

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IPC IPC(8): A61B17/68A61L31/08A61L31/02
Inventor 储成林薛烽白晶郭超盛晓波董寅生林萍华
Owner SOUTHEAST UNIV
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