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Bio-medical porous titanium products and preparation method thereof

A biomedical, porous titanium technology, applied in medical science, prosthesis, surgery, etc., can solve the problems of its own shape limitation, reduced strength of molded products, low strength, etc., to eliminate or reduce stress shielding and meet mechanical properties. requirements, the effect of reducing the effect of stress concentration

Inactive Publication Date: 2010-09-08
DALIAN JIAOTONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the elastic modulus of dense titanium is still higher than that of natural bone (the elastic modulus of dense titanium is 110GPa, and the elastic modulus of human bone is 1.5-30GPa), making dense titanium as a human implant material in the following three There are problems in: the stability of the contact interface with bone tissue, the matching of biomechanical properties (such as elastic modulus), and the maintenance of stable blood supply
[0011] CN1817511A discloses a gel injection molding method for porous titanium with complex shapes. The gel injection molding process is used to realize the production of large powder metallurgy porous titanium blanks with high porosity and uniform macroscopic distribution of pores. Porous titanium can be obtained after sintering, but the disadvantage is that the porosity of the product is only up to 55%, and the strength is low
[0012] CN1961972A discloses a powder co-injection molding method. The inner core feeding material and the outer layer feeding material are respectively injected and molded successively, and then sintered after degreasing and desalting to obtain a porous structure titanium product whose inner core is a dense body and the outer layer is a porous body. The bonding strength of the method is 100-200MPa, but this method is complicated and inconvenient to operate.
[0013] CN101053672A has invented a method for preparing hollow fiber porous bio-titanium material. The disadvantage is that this method can only obtain hollow porous rods or columns, and its application range is limited by its own shape.
However, Laptev A (Laptev A, Vyal O, Bram M et al. Green strength of powder compacts provided for production of highly porous titanium parts. Powder Metallurgy. 2005.48 (4): 358-364.) found that if ammonium bicarbonate Or urea as a pore-forming agent must be sintered immediately after molding, otherwise, even if it is placed at room temperature, the strength of the molded product will decrease with time (because ammonium bicarbonate will decompose at room temperature, while urea is very easy to absorb water) , ultimately affecting the performance of porous titanium
Moreover, the volatilized gas after the decomposition of ammonium bicarbonate or urea contains pungent ammonia gas, which pollutes the environment

Method used

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  • Bio-medical porous titanium products and preparation method thereof
  • Bio-medical porous titanium products and preparation method thereof
  • Bio-medical porous titanium products and preparation method thereof

Examples

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Embodiment 1

[0042] Titanium powder with a particle size of ≤45 μm and a purity of >99.3% is used as a base material, and spherical polymethyl methacrylate particles are added as a pore-forming agent. The particle sizes are: 71-100 μm, 100-154 μm, 154-200 μm, 200-315 μm, 315~400μm, 400~630μm. The volume fraction of the pore-forming agent is set to be 10vol.%, 25vol.%, 30vol.%, 40vol.%, 50vol.%, 55vol.%, 60vol.% and 65vol.%. Weigh the material according to the proportion, mix the weighed titanium powder and pore-forming agent evenly, take an appropriate amount and pour it into the mold, and press it on a hydraulic universal testing machine with a pressure of 500MPa in one direction, and the dwell time is 15 seconds. Place the compact in a vacuum sintering furnace at 5×10 -3 Under the vacuum degree of Pa, heat up to 250°C at a speed of 10°C / min, and after holding for 30 minutes, gradually heat at a speed of 3°C / min to 300°C, 350°C, 400°C, hold for 40 minutes each, and then gradually heat A...

Embodiment 2

[0048] This example aims at preparing a gradient biomedical porous titanium material. The particle size, purity and volume fraction of the base material titanium powder and the added pore-forming agent polymethyl methacrylate spherical particles are the same as those in Example 1.

[0049] Pour the titanium powder into the mold, after paving, mix the weighed titanium powder and pore-forming agent evenly, take an appropriate amount and pour it into the mold, after paving, then pour an appropriate amount of titanium powder into the mold, and then spread another The mixed powder of titanium powder and pore forming agent is added in increments. The number of layers and the pore characteristics of each layer of porous titanium are set according to requirements. Then use 500MPa pressure unidirectional pressing on the hydraulic universal testing machine, the dwell time is 15 seconds, take out the green compact, place it in the vacuum sintering furnace, in 2×10 -3 Under the vacuum de...

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Abstract

The invention relates to a biological medical porous titanium material and a preparation method thereof. The preparation method, namely a method adopting powder metallurgy, is to add spherical particles of novel polymethyl methacrylate pore-forming agent to prepare a structure provided with a rough surface and three-dimensionally communicated open pores, wherein the number, the shape and the sizeof the pores can be controlled, namely, the porosity degree is less than 70vol. percent, the open porosity factor is more than 60 percent, the average pore diameter is less than 500 mums, the Young'smodulus in compression is more than 0.3 GPa, the compressive strength is more than 40MPa, and the bending strength is more than 50MPa. The biological medical porous titanium material can be widely applied in the field of biological medical implants such as dental implants, artificial joints, spinal orthopaedic internal fixed systems, medullary internal nails and orthopaedic armor plates.

Description

technical field [0001] The invention relates to a biomedical porous titanium material and a preparation method thereof. Background technique [0002] Due to its ideal biocompatibility, excellent corrosion resistance, high fatigue strength, and low elastic modulus, titanium has become the most ideal metal biomaterial for long-term or permanent implantation in the human body. However, the elastic modulus of dense titanium is still higher than that of natural bone (the elastic modulus of dense titanium is 110GPa, and the elastic modulus of human bone is 1.5-30GPa), making dense titanium as a human implant material in the following three There are problems in aspects: the stability of the contact interface with bone tissue, the matching of biomechanical properties (such as elastic modulus) and the maintenance of stable blood supply. The elastic modulus of porous titanium decreases with the increase of porosity. Therefore, the use of porous titanium instead of dense titanium as ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A61L27/06A61L27/56C22C1/04C22C1/08B22F3/12A61L31/02A61L31/14
Inventor 陆兴李伯琼
Owner DALIAN JIAOTONG UNIVERSITY
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