High-strength absorbable lamellar composite endosseous fixing instrument and preparation method thereof

An absorbing layer and high-strength technology, which is applied in the field of high-strength absorbable layered composite bone internal fixation devices and its preparation, can solve problems such as difficulty in meeting mechanical safety requirements, and achieve the effect of delaying corrosion

Inactive Publication Date: 2013-02-13
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] The QE22 magnesium alloy is rolled and processed into a magnesium alloy sheet with a thickness of 0.1mm, and several through-square through holes are processed on the magnesium alloy sheet; 10g / L sodium silicate, 4g / L hydroxyapatite nanopowder, 3g / L NaOH is used as the micro-arc oxidation electrolyte system. Magnesium alloy flakes are immersed in it, and a voltage of 350V is applied for 10 minutes of micro-arc oxidation treatment, so that a layer of magnesium oxide and hydroxyapatite with a thickness of about 10 μm is formed on the surface in situ The bottom layer of stone composite ceramics; by weight percentage, magnesium alloy flakes account for 80%, and polylactic acid with a molecular weight of 300,000 accounts for 20%. Oriented dispersion arrangement, evenly fixed in the hot-pressing mold; high-temperature molten polylactic acid polymer material is injected into the hot-pressing mold, hot-pressed and solidified to form a plate, and finally processed into a bone jo...

Embodiment 2

[0044] The AE21 magnesium alloy is rolled and processed into a magnesium alloy sheet with a thickness of 0.2mm, and several through circular holes are processed on the magnesium alloy sheet; 10g / L sodium silicate, 3g / L hydroxyapatite nanopowder, 3g / L NaOH is used as the micro-arc oxidation electrolyte system. Magnesium alloy flakes are immersed in it, and a voltage of 400V is applied for 15 minutes of micro-arc oxidation treatment, so that a layer of magnesium oxide and hydroxyl phosphorus with a thickness of about 20 μm is formed on the surface in situ. Limestone composite ceramic bottom layer; by weight percentage, magnesium alloy flakes account for 70%, and polylactic acid with a molecular weight of 500,000 accounts for 30%. Prepare the polylactic acid pre-coating layer on the surface of the alloy sheet; then cut the magnesium alloy sheet prefabricated blank with the polylactic acid pre-coating layer on the surface according to the requirements, then stack and arrange it in ...

Embodiment 3

[0046] The AZ31B magnesium alloy is rolled and processed into a magnesium alloy sheet with a thickness of 0.3mm, and a number of through-square through holes are processed on the magnesium alloy sheet; 10g / L sodium silicate and 2g / L NaOH are used as the micro-arc oxidation electrolyte system, Immerse the magnesium alloy flakes in it, apply a voltage of 400V, and perform 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; the magnesium alloy flakes account for 60% by weight, and the molecular weight is 70. Wan’s polylactic acid accounted for 40%, respectively weighed appropriate amount of magnesium alloy flakes and polylactic acid polymer materials, and fixed the magnesium alloy flakes in the injection mold in a manner of dispersing and oriented parallel to each other; The lactic acid polymer material is extruded and injected into the injection mold, and then injected and solidifie...

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Abstract

The invention relates to a high-strength absorbable lamellar composite endosseous fixing instrument and a preparation method thereof. The instrument is mainly formed by compositing magnesium alloy sheets or strips with through holes on the surfaces according to a set lamellar rank structure mode, an interlayer of adjacent magnesium alloy sheets or strips are subjected to high-temperature bonding and solidifying by means of low-content binding agent polylactic acid high polymer materials, the magnesium alloy sheets or strips are directionally ranked in a disperse mode or mutually paralleled or crossed, the instrument comprises, by weight, 5%-49.9% of binding agent polylactic acid and 50.1%-95% of the magnesium alloy sheets or strips, and the thickness of the magnesium alloy sheets or strips is 0.01mm-1mm. According to the high-strength absorbable lamellar composite endosseous fixing instrument, the strength of the instrument is close to that of magnesium alloy, mechanics safety requirements of large load fracture fixation for higher strength can be met, and the instrument is particularly applicable to absorbable endosseous fixing implantation instruments which are high in strength requirement, large in size and clinically applicable to bone traumatology department, bone defect repair department and plastic surgery.

Description

technical field [0001] The invention relates to a high-strength absorbable layered composite bone internal fixation device, in particular to a magnesium alloy sheet or thin strip with through holes on the surface in a set layered arrangement structure. The alloy flakes or thin strips are bonded and solidified at high temperature through a low content of binder polylactic acid polymer material. Among them, the magnesium alloy flakes or thin strips are oriented and dispersed, or parallel to each other or form a cross, with high strength. , uniform absorption in the body and controllable, less degraded and decomposed hydrogen release amount, etc., are especially suitable for high-strength, large-volume orthopedic trauma surgery, bone defect repair surgery, orthopedic implants for plastic surgery, and belong to the technical field of medical devices. Background technique [0002] At present, the most commonly used orthopedic implants are made of titanium alloy, stainless steel, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61B17/68A61L31/14A61L31/08A61L31/02B32B15/01B32B3/24
Inventor 储成林薛烽郭超白晶盛晓波董寅生林萍华
Owner SOUTHEAST UNIV
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