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Preparation method for medical porous metal material for replacing dentale

A porous metal and dental bone technology, applied in metal processing equipment, medical science, transportation and packaging, etc., can solve the problems of mechanical properties such as ductility, compressive strength, insufficient bending strength, and affect the processing of porous tantalum materials, etc., to improve Biocompatibility and biosafety, good pore size uniformity of the finished product, and the effect of pore distribution connectivity

Active Publication Date: 2013-12-25
CHONGQING RUNZE PHARM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, porous tantalum, which is used as a medical implant material for compact bone tissue such as dental bone, has obvious deficiencies in mechanical properties such as ductility, compressive strength, and bending strength, and will affect subsequent research on porous tantalum. Processing of the material itself, such as cutting of molded parts, etc.

Method used

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  • Preparation method for medical porous metal material for replacing dentale
  • Preparation method for medical porous metal material for replacing dentale
  • Preparation method for medical porous metal material for replacing dentale

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preparation example Construction

[0024] A kind of preparation method of the medical porous metal material that replaces dental bone is to select molding agent, pore-forming agent (the molding agent is one or more arbitrary combinations in stearic acid, zinc stearate, paraffin, synthetic rubber , the pore-forming agent is one or more of urea, sodium chloride, ethyl cellulose, and methyl cellulose in any combination) mixed with tantalum powder with an average particle size of less than 43 microns and an oxygen content of less than 0.1%. Mixed powder, the mixed powder is pressed into an organic foam at 50-100Mpa to form, and then degreased, sintered, cooled and heat-treated to obtain a porous tantalum material. The formed porous tantalum is tested to have a porosity of 20-30%, and a pore diameter of 5-30 μm.

[0025] More specifically, the above-mentioned porous tantalum is composed of 5-10% (by volume percentage) of the above-mentioned forming agent, 20-30% (by volume percentage) of the above-mentioned pore-for...

Embodiment 1

[0028] Embodiment 1: take by weighing zinc stearate, average particle diameter less than 43 micron oxygen content less than 0.1% tantalum powder and methyl cellulose and mix uniformly into mixed powder, wherein zinc stearate accounts for 6%, methyl cellulose accounts for 23%, and tantalum powder accounted for 71%, all calculated by volume percentage. Pressure molding: Add the above mixed powder into an injection molding machine and press it into a polyurethane foam (pore diameter 0.48-0.89mm, density 0.015g / cm2) at 62Mpa 3 ~0.035g / cm 3 , hardness greater than 50°) in molding. Degreasing treatment: vacuum degree 10 -4 Pa, from room temperature to 400°C at a heating rate of 1.5°C / min and hold for 110 minutes; then at a heating rate of 2.5°C / min from 400°C to 700°C for a holding time of 210 minutes. Vacuum sintering: sintering in a vacuum furnace, the sintering temperature is 2000°C, the heat preservation is 2 hours, and the vacuum degree is 10 -4 Pa, the sintering process is...

Embodiment 2

[0030] Embodiment 2: take by weighing paraffin, average particle diameter less than 43 microns, oxygen content less than 0.1% niobium powder and urea and mix uniformly into mixed powder, wherein paraffin accounts for 5%, ethyl cellulose accounts for 30%, and niobium powder accounts for 65%, All are calculated by volume percentage. Compression molding: Add the above mixed powder into an injection molding machine and press it under 65Mpa to a hole diameter of 0.56-0.72mm and a density of 0.025g / cm 3 , molded in polyurethane foam with a hardness of 50°-80°. Degreasing treatment: vacuum degree 10 -4 Pa, raise the temperature from room temperature to 400°C at a heating rate of 2°C / min, and hold for 100 minutes; then raise the temperature from 400°C to 800°C at a heating rate of 3°C / min, and hold for 200 minutes. Vacuum sintering: sintering in a vacuum furnace, the sintering temperature is 2100°C, the heat preservation is 4 hours, and the vacuum degree is 10 -4 Pa, the sintering ...

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Abstract

A preparation method for a medical porous metal material for dental bone replacement: mixing tantalum powder, a pore-forming agent, and a forming agent into a powder mixture, press-forming the powder into an organic foamed body, then degreasing, sintering, cooling, and performing a heating process to produce the porous tantalum material. The pressure used during the press-forming is 50 to 100 Mpa. The pore-forming agent is one of or a combination of urea, sodium chloride, ethyl cellulose, and methyl cellulose. The forming agent is one of or a combination of stearic acid, zinc stearate, paraffin, and synthetic rubber. Measurements show that the porous tantalum material prepared using the preparation method has an impurity concentration lower than 0.2%. The density reaches 11.67 to 13.34 g / cm3, the porosity reaches 20% to 30%, and the pore diameter reaches 5 to 30 mum. The elastic modulus reaches 4.5 to 6.0 Gpa, the bending strength reaches 110 to 130 Mpa, and the compressive strength reaches 100 to 130 Mpa. The porous tantalum prepared using the method is applicable as a medical implant material for dental bone replacement.

Description

technical field [0001] The invention relates to a preparation method of a medical porous metal implant material, in particular to a preparation method of a medical implant porous metal material replacing compact bone tissue. Background technique [0002] Porous medical metal implant materials have important and special uses in the treatment of bone tissue trauma, femoral tissue necrosis, and replacement of dense bone tissue such as dental bone. The common materials of this type include porous metal stainless steel and porous metal titanium. As a porous implant material used in the treatment of bone tissue trauma and femoral tissue necrosis, its porosity should reach 30-80%, and the pores should be all connected and evenly distributed, or it should be consistent with the growth of human bone tissue as needed. , and reduce the weight of the material itself, so that it is suitable for human implantation. [0003] The refractory metal tantalum / niobium, because of its excellent ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A61L27/04A61L27/56C22C1/08C22C27/02
CPCB22F3/1125B22F2998/10A61L27/56A61L27/047C22C27/02B22F1/10B22F3/02B22F3/10
Inventor 叶雷
Owner CHONGQING RUNZE PHARM CO LTD
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