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Porous metal implant with micro-arc oxidation coating and preparation method

A porous metal and micro-arc oxidation technology, applied in the field of medical devices, can solve the problems of slow healing of bone tissue, and achieve the effect of improving osteogenic activity, improving the micro-arc oxidation process, and promoting healing

Active Publication Date: 2016-06-15
PEKING UNIV THIRD HOSPITAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a bioactive coating covering both the external surface and the internal surface, aiming at the defect that the bone tissue of the dense metal implant with a bioactive coating is slow in healing in the prior art. Porous metal implant and preparation method thereof

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preparation example Construction

[0031] see figure 1 , the preparation method of the porous metal implant with micro-arc oxidation coating provided by the present invention mainly comprises the following steps:

[0032] S1. Scaffold preparation step: preparing a porous metal scaffold with partially or completely interconnected pores, the pore size of which is 300-1800um. The porous metal support prepared in the present invention can be a fully porous metal structure, such as intervertebral cages, artificial vertebral bodies, maxillofacial bones, teeth and other replacement prostheses and porous metals used for hard tissue replacement in other parts; Some parts of the prosthesis are porous metal and the rest are dense metal structures, such as hip cups, femoral stems implanted in the medullary cavity part of the prosthesis is porous metal.

[0033] In this step, metal materials such as titanium, titanium alloy, magnesium or magnesium alloy can be used to make porous metal scaffolds, such as Ti6Al4V, Ti6Al7Nb ...

Embodiment 1

[0049] 1. Using electron beam melting technology to prepare porous metal stents with titanium alloy (Ti6Al4V) as raw material, the specification is a cylinder with a diameter of 10.0mm and a height of 5mm. The pore shape is a dodecahedral structure, and the pore size is 600um. A handle with a length of 5mm and a diameter of 1mm is used for connecting electrodes;

[0050] 2. Use deionized water or distilled water to prepare an alkaline electrolyte containing 0.065 mol / L calcium acetate, 0.03 mol / L sodium dihydrogen phosphate, 0.04 mol / L EDTA-2Na, and 0.5 mol / L sodium hydroxide;

[0051] 3. The porous metal support prepared by electron beam melting technology is used as the anode, and the stainless steel is used as the cathode. The alkaline electrolyte is stirred with a magnetic stirrer at a stirring speed of 35 times / min; a DC pulse power supply is used for micro-arc oxidation. Set the voltage to 350V, the duty cycle to 10%, and the frequency to 500Hz; use a circulating water c...

Embodiment 2

[0060] 1. Using laser selective melting technology to prepare porous metal stents with pure titanium as raw material, the specification is a cylinder with a diameter of 10.0mm and a height of 5mm. The pore shape is a honeycomb structure with a pore size of 300um, and a handle with a length of 5mm and a diameter of 1mm is designed. For connecting electrodes;

[0061] 2. Use deionized water or distilled water to prepare an alkaline electrolyte containing 0.01mol / L calcium acetate, 0.01mol / L sodium dihydrogen phosphate, 0.02mol / L EDTA-2Na, and 0.25mol / L sodium hydroxide;

[0062] 3. The porous metal support prepared by laser selective melting technology is used as the anode, and the stainless steel is used as the cathode. The alkaline electrolyte is stirred with a magnetic stirrer at a stirring speed of 40 times / min; a DC pulse power supply is used for micro-arc oxidation. Set the voltage to 250V, the duty cycle to 5%, and the frequency to 500Hz; use a circulating water cooling s...

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Abstract

The invention provides a porous metal implant with a micro-arc oxidation coating and a preparation method. The preparation method comprises the steps of bracket preparation and micro-arc oxidation, specifically, a porous metal bracket with pores partially or completely communicating with one another is prepared at first, and the size of each pore is 300-1800 [mu]m; and then, the porous metal bracket is subjected to micro-arc oxidation under the stirring condition, and the porous metal implant with the external surface and the internal surface of the bracket being each coated with the micro-arc oxidation coating is prepared. According to the porous metal implant with the micro-arc oxidation coating and the preparation method, the uniform micro-arc oxidation coating containing calcium and phosphorus is formed on the internal and the external surface of the porous metal, the osteogenic activity of the porous metal can be facilitated, bone ingrowth can be improved, and the bone integration capability of the porous metal is improved; in addition, the coating process is high in efficiency, low in cost, free of pollution and convenient to apply industrially.

Description

technical field [0001] The invention relates to the field of medical devices, more specifically, to a porous metal implant with a micro-arc oxidation coating and a preparation method. Background technique [0002] Metal implants, especially pure titanium and titanium alloy materials, are widely used in orthopedic and dental defect repair and stability reconstruction, which greatly improves the curative effect and quality of life of orthopedic and dental patients. However, the biologically inert surface of metal implants is not conducive to sufficient bone ingrowth, and there are potential problems such as metal corrosion and metal ion dissolution in long-term implantation in the human body, making it prone to bone graft nonunion and osteolysis around the implant. Such risks greatly limit its application. Therefore, in order to improve the bioactivity of metal implants, in recent years, people have carried out surface treatment on metal implants to prepare bioactive coatings...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D11/02C25D11/26C25D11/30A61K6/04A61K6/033A61L27/32A61L27/56A61K6/838
Inventor 刘忠军修鹏蔡宏
Owner PEKING UNIV THIRD HOSPITAL
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