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Absorbable orthopedic instrument material with piezoelectric effect and preparation method thereof

A piezoelectric effect and conductive material technology, applied in the field of orthopedic devices, can solve the problems of poor polarization effect of piezoelectric ceramics, difficult piezoelectric signal conduction, low stress sensitivity, etc., so as to improve polarization effect and stress sensitivity. , the effect of high elastic modulus

Inactive Publication Date: 2015-02-04
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Technical problem: The purpose of this invention is to provide a kind of absorbable orthopedic device material with piezoelectric effect and its preparation method. The above-mentioned problems of poor piezoelectric ceramic polarization effect, low stress sensitivity, and difficult piezoelectric signal transmission in the device involve the selection of degradable conductive materials, improvement of piezoelectric ceramic polarization effect, increase of stress sensitivity, and weak Effective transmission of piezoelectric signals and other technical issues

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0024] The preparation steps of the orthopedic instruments are as follows:

[0025] 1) Mixing of polymers, piezoelectric ceramic particles, imaging materials, and graphene: dissolve biodegradable absorbing polymers in organic solvents or melt at high temperatures to obtain polymer slurry, and then add bio-piezoelectric ceramic particles, imaging materials , graphene mixed evenly. Compared with other carbon materials, graphene with excellent biocompatibility has better dielectric and conductive properties, and the addition of a small amount of graphene can significantly improve the electrical polarization effect and weak piezoelectric signal of piezoelectric ceramic particles in polymers conduction.

[0026]2) Processing of degradable conductive materials: Pure magnesium or magnesium alloys as conductive materials are processed into wires or plates by drawing or rolling. Magnesium and magnesium alloys are medical degradable metals. Compared with bioabsorbable polymers, magnes...

Embodiment 1

[0034] The selected degradable absorbent polymer is polylactic acid (PLLA), and the volume fraction of magnesium wire as a conductive material is 20%. The preparation process of orthopedic instruments is as follows:

[0035] 1) After heating the PLLA polymer to 190°C to melt, add BaTiO 3 Granules (particle size 50 μm, volume fraction 20%), sodium iodide (volume fraction 0.5%), graphene (volume fraction 0.05%) are mixed to make a slurry;

[0036] 2) Drawing pure magnesium into a wire with a diameter of 0.3mm;

[0037] 3) Arrange the magnesium wire obtained in 2) in the cavity of the mold, then inject the slurry obtained in 1) into the cavity and mix it evenly with the wire, and then mold it into a rod at 170°C;

[0038] 4) Polarize the obtained rods in a high-voltage direct current oil bath device. The polarization temperature is 90°C, the polarization time is 20min, and the polarization voltage is 4000V. Finally, they are machined into pins, screws, bone nails, etc. Orthope...

Embodiment 2

[0040] The selected degradable absorbent polymer is PGLA, a copolymer of polylactic acid and polyglycolic acid, and the composition of magnesium alloy as a conductive material is AZ31B, with a volume fraction of 30%. The orthopedic device preparation process is as follows:

[0041] 1) After heating the PGLA polymer to 190°C to melt, add lithium sodium potassium niobate particles (particle size is 40 μm, volume fraction is 15%), sodium iodide (volume fraction is 1%), graphene (volume fraction is 0.5%) mixed to make slurry;

[0042] 2) Hot rolling the magnesium alloy into a 0.5mm plate;

[0043] 3) Arrange the magnesium alloy plates obtained in 2) in the mold cavity, then inject the slurry obtained in 1) into the cavity and mix them evenly with the plates, and mold them into plates at 160°C;

[0044] 4) Polarize the obtained plate in a high-voltage direct current oil bath device. The polarization temperature is 100°C, the polarization time is 30min, and the polarization voltag...

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Abstract

The invention relates to an absorbable orthopedic instrument material with a piezoelectric effect and a preparation method thereof. The orthopedic instrument is formed by compounding a medical absorbable high polymer, biological piezoelectric ceramic particles dispersed and distributed in the polymer, and a degradable conductive material which transmits a piezoelectric signal. In the using process, the piezoelectric signal generated by the biological piezoelectric ceramic particles dispersed and distributed in the polymer can be effectively transmitted to the body tissues around the orthopedic instrument by the conductive material, namely a pure magnesium or magnesium alloy wire or plate, near the biological piezoelectric ceramics in the polymer under the action of an external load, the formed electrical stimulation signal can accelerate fracture healing, and the absorbable orthopedic instrument material can be in different structural forms such as bone nails and bone lamellas and is wide in application prospects.

Description

technical field [0001] The invention relates to an absorbable orthopedic device with special functions and a preparation method thereof. During use, electrical stimulation signals are formed and can be effectively transmitted to surrounding body tissues, which can accelerate fracture healing. It belongs to the technical field of orthopedic devices, specifically An absorbable orthopedic device material with piezoelectric effect and a preparation method thereof. Background technique [0002] Implanting bone plates, bone nails and other fixation devices to fix fractures is one of the main methods to heal fractures clinically. Traditionally, metal fixation materials such as stainless steel and titanium alloys are used to make fixation devices, but due to the high modulus of elasticity, it is easy to cause stress. Masking effect, thus causing problems such as osteoporosis. These shortcomings can be overcome by using biodegradable polymers such as polylactic acid, polyglycolic ac...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A61L31/12A61L31/14A61L31/18A61L31/02C25D13/02C25D15/00C25D11/30
Inventor 储成林李旋白晶郭超薛烽林萍华
Owner SOUTHEAST UNIV
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