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Method for preparing medical porous metal implant material

A technology for implant materials and porous metals, which is applied in the field of preparation of medical metal implant materials, can solve the problems of mechanical properties such as ductility, compressive strength, insufficient bending strength, and affect the processing of porous tantalum materials, so as to improve biocompatibility And biological safety, good pore size uniformity of the finished product, and the effect of connected pore distribution

Active Publication Date: 2015-03-11
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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  • Method for preparing medical porous metal implant material
  • Method for preparing medical porous metal implant material
  • Method for preparing medical porous metal implant material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Embodiment 1: Take paraffin wax, tantalum powder and ethyl cellulose with an average particle size less than 43 microns and an oxygen content of less than 0.1% and mix them uniformly to form a mixed powder, wherein paraffin wax accounts for 8%, ethyl cellulose accounts for 27%, tantalum powder accounts for 65%, all in volume percentage. Granulation: The mixed powder is granulated into round particles with a particle diameter of 10-13 μm at a working temperature of 510-520° C. and a working pressure of 12-13 MPa. Injection molding: the temperature for injecting the round particles into the mold is 465-490° C. and the pressure is 83-85 MPa. Demolding time: 6~7S. Degreasing treatment: vacuum degree 10 -4 Pa, rise from room temperature to 400°C at a rate of 1-3°C / min, hold for 60-120 minutes, rise from 400°C to 600-800°C at a rate of 1.5-2.5°C / min, and hold for 180-240 minutes. Vacuum sintering: sintering in a vacuum furnace, the sintering temperature is 2000°C, the heat...

Embodiment 2

[0031] Embodiment 2: Weigh polyvinyl alcohol, tantalum powder with an average particle size less than 43 microns and an oxygen content of less than 0.1%, and sodium bicarbonate and mix them uniformly to form a mixed powder, wherein polyvinyl alcohol accounts for 6%, sodium bicarbonate accounts for 29%, tantalum Powder accounted for 65%, all in volume percentage. Granulation: The mixed powder was granulated into round particles with a particle diameter of 20 μm at a working temperature of 450° C. and a working pressure of 15 MPa. Injection molding: the temperature of injecting the round particles into the mold is 540° C. and the pressure is 90 MPa. Demolding time: 9S. Degreasing treatment: vacuum degree 10 -4 Pa, raise the temperature from room temperature to 400°C at a heating rate of 1°C / min, and hold for 60 minutes; then raise the temperature from 400°C to 800°C at a heating rate of 2.5°C / min, and hold for 180 minutes. Vacuum sintering: sintering in a vacuum furnace, the ...

Embodiment 3

[0033] Embodiment 3: 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 10%, methyl cellulose accounts for 10%. 23%, tantalum powder accounted for 67%, both by volume percentage. Granulation: The mixed powder was granulated into circular particles with a particle diameter of 10 μm at a working temperature of 650° C. and a working pressure of 12 MPa. Injection molding: the temperature of injecting the round particles into the mold is 380° C. and the pressure is 72 MPa. Demolding time: 6S. Degreasing treatment: vacuum degree 10 -4 Pa, from room temperature to 400°C at a heating rate of 3°C / min and hold for 120 minutes; then at a heating rate of 1.5°C / min from 400°C to 750°C for 240 minutes. Vacuum sintering: sintering in a vacuum furnace, the sintering temperature is 2200°C, the heat preservation is 2.5 hours, an...

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Abstract

The invention discloses a method for preparing a medical porous metal implant material. The method comprises the following steps: mixing tantalum powder, pore forming agents and forming agents into mixed powder, subsequently pelletizing, injecting into a mold to be formed, demolding, degreasing, sintering and performing thermal treatment so as to obtain the medical porous metal implant material for replacing dental osseous tissue, wherein the pore forming agent comprises one or more of sodium bicarbonate, urea, sodium chloride, methylcellulose and ethyecellulose; the forming agents comprise one or more of polyving akohol, stearic acid, zinc stearate, paraffin and synthesized rubber; the degreasing process comprises the steps of slowing raising the temperature to be 400-800 DEG C in the velocity of 0.5-3 DEG C per minute, introducing argon to form protection atmosphere, and keeping the temperature for 60-240 minutes. Tests show that the content of impurities in the prepared porous tantalum material can be less than 0.2%, the density can be 11.67-13.34g / cm<3>, the porosity can be 20-30%, the pore diameter can be 12-25mu m, the elasticity modulus can be 4.5-6.0Gpa, the ductility can be 12.0-13.8%, the bending strength can be 120-150Mpa, and the compressive strength can be 90-110Mpa.

Description

[0001] The application of the present invention is a divisional application with the application number 201110298009.1, the application date of September 29, 2011, and the title of the invention "a preparation method of a medical porous metal implant material". technical field [0002] The invention relates to a preparation method of a medical metal implant material, in particular to a preparation method of a medical porous metal implant material. Background technique [0003] 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 co...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A61L27/56A61L27/04C22C1/08C22C27/02
Inventor 叶雷
Owner CHONGQING RUNZE PHARM CO LTD
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