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Method for differential arc oxidation treatment of Nickel-titanium alloy for medical purpose

A nickel-titanium alloy, micro-arc oxidation technology, applied in medical science, prosthesis, surgery, etc., to achieve the effect of simple micro-arc oxidation method, high biological safety, and enhanced biological safety

Inactive Publication Date: 2010-02-17
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that there is no direct micro-arc oxidation treatment of medical NiTi alloy at home and abroad so far, and provide a method for medical NiTi alloy micro-arc oxidation treatment

Method used

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Experimental program
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Effect test

specific Embodiment approach 1

[0008] Specific embodiment one: the micro-arc oxidation treatment of medical nickel-titanium alloy in this embodiment is carried out according to the following steps: (1) surface pretreatment of medical nickel-titanium alloy; (2) putting the pretreated medical nickel-titanium alloy into the working fluid, Use NiTi alloy as the positive pole, the working tank as the negative pole, and control the temperature of the working fluid at 10-40°C. In a bidirectional pulse power supply, the positive pulse voltage is 200-600V, the negative pulse voltage is 0-300V, and the positive and negative pulse working frequency is 30 Treat for 5-60min under the condition of ~3000Hz; (3) NiTi alloy is washed with distilled water for 3-4 times and then dried to obtain the medical nickel-titanium alloy whose surface has been treated by micro-arc oxidation; wherein the working fluid in step (2) is acidic Or alkaline system, the acidic system working fluid includes 2-10mL phosphoric acid, 1-10g titanium...

specific Embodiment approach 2

[0011] Embodiment 2: The difference between this embodiment and Embodiment 1 is: Step (1) The surface pretreatment of the medical nickel-titanium alloy is followed by degreasing, SiC sandpaper grinding and ultrasonic cleaning. Other steps and selected parameters are the same as those in Embodiment 1.

specific Embodiment approach 3

[0012] Embodiment 3: The difference between this embodiment and Embodiment 1 is that the working tank in step (2) is made of stainless steel. Other steps and selected parameters are the same as those in Embodiment 1.

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Abstract

The invention discloses a method of medical nickel titanium alloy differential arc oxidation treatment, which comprises the following steps: (1) pre-treating surface; (2) putting into hydraulic fluid;choosing NiTi ally as positive pole and loading trough as negative pole; treating; (3)washing; drying; getting the product. This invention possesses simple method, which can inhibit discharging of Niion in nickel titanium alloy and reinforce safety.

Description

technical field [0001] The invention relates to a method for alloy micro-arc oxidation treatment. Background technique [0002] Nickel-titanium (NiTi) alloys are widely used in clinical medicine such as dentistry, orthopedics, and cardiovascular departments because of their excellent properties such as shape memory effect and superelasticity. However, the content of Ni in the medical NiTi alloy is high, and Ni accounts for 50.5% to 51.5% of the atomic percentage of the alloy. Studies have shown that after the medical NiTi alloy is implanted into the human body, Ni ions are precipitated due to body fluid corrosion on the implant surface. , the surface of the alloy is corroded to produce a loose reaction layer, which intensifies the wear of the material surface, and the wear debris generated by the wear will seriously affect the biological safety of the implant. As we all know, nickel is a biologically toxic element, and Ni ions have potential carcinogenic effects. Therefore,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D11/26A61L27/06A61L31/02
Inventor 王福平刘福徐吉林于德珍辛铁柱
Owner HARBIN INST OF TECH
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