Nickel-titanium alloy medical equipment with surface coating and coating preparation method

A technology for medical devices and nickel-titanium alloys, which is applied to the field of nickel-titanium alloy medical devices with surface coating and the preparation of surface coatings of nickel-titanium alloy medical devices, can solve the problem of the decline of the mechanical properties of orthodontic wires and the increase of the temperature of the base material. , loss of superelastic properties, etc., to achieve the effect of reducing intake, improving binding force, and reducing stress difference

Active Publication Date: 2018-10-23
CHINA MOREFOUND TECH LTD SHENZHEN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During the whole coating process, the negative bias voltage exists all the time, which leads to the continuous acceleration of ions and the rapid increase of the temperature of the base material (ie, nickel-titanium orthodontic wire), which may change the phase transition temperature of the nickel-titanium alloy. Lead to the decline of mechanical properties of orthodontic wire and the loss of superelasticity
Therefore, in order to control the temperature of the base material, in the method disclosed in CN 200680054491.1, the duration of each coating is short (generally 20-120s), and the ion source is immediately turned off after the coating, and the next coating is carried out after more than 20s. plated, which makes the method less efficient for preparing

Method used

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  • Nickel-titanium alloy medical equipment with surface coating and coating preparation method
  • Nickel-titanium alloy medical equipment with surface coating and coating preparation method
  • Nickel-titanium alloy medical equipment with surface coating and coating preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] Embodiment 1. NiTi orthodontic wire is carried out the treatment before coating preparation

[0054] The formed NiTi orthodontic wire looks like figure 1 As shown, it is an untreated NiTi orthodontic wire commonly used in clinical practice, its diameter can range from 0.3 mm to 0.51 mm, the length L of the square wire can range from 0.4 mm to 0.65 mm, and the width W can range from 0.4 mm to 0.55 mm. Before treatment, the NiTi orthodontic wire can be treated by removing the surface oxide layer, ultrasonic cleaning, drying, etc. The specific process is as follows:

[0055] Strong acid is used as the surface polishing solution, and the composition and ratio of the solution are HF:HNO 3 :H 2 O=1:10:20, pickling until there are no bubbles escaping from the surface of the material and the liquid, or use the solution composition and ratio of HF:HNO 3 :H 2 The strong acid of O=(1.5~2.5):(8~15):(10~20) is used as the surface polishing solution, pickling for 5~10 minutes;

[...

Embodiment 2

[0059] Example 2. Ion implantation deposition treatment of NiTi orthodontic wire

[0060] like figure 2 As shown, NiTi orthodontic wire was subjected to ion implantation deposition treatment.

[0061] 2-1. The plasma implantation deposition equipment used in this embodiment uses arc discharge to evaporate the target material to generate ions, which are loaded to the target platform with a pulsed negative bias voltage to realize intermittent ion implantation deposition. The specific operation is as follows:

[0062] Place the dried NiTi orthodontic wire in the plasma treatment equipment. A DC filtered arc source evaporates the titanium target, the arc source current is 60A, the target platform is loaded with a negative bias voltage of -200V, the frequency is 1000Hz, and the duty cycle is set to 20%. The surface is sputtered and cleaned by feeding argon gas, wherein the flow rate of argon gas is 30 sccm, and the cleaning time is 5-8 minutes. After cleaning, adjust the flow ...

Embodiment 3

[0070] Example 3. Appearance of NiTi orthodontic wire after coating

[0071] like image 3 As shown in (a), the coated NiTi orthodontic wire has a light golden color, and the untreated NiTi orthodontic wire has a metallic primary color. The difference in color indicates successful application of the Ti-TiN coating. image 3 (b) shows the microstructure of the NiTi orthodontic wire prepared in Example 2-2 under an optical microscope, indicating that the surface of the NiTi orthodontic wire prepared by the method of the present invention is covered by a titanium transition layer, titanium-titanium nitride The coating composed of gradient transition layer and pure titanium nitride layer is tightly and uniformly wrapped.

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Abstract

The invention discloses a method for preparing a surface coating of nickel-titanium alloy medical equipment. The method comprises the following steps that (1) impulse negative bias is loaded, and titanium ions are injected, so that a titanium transition layer is formed; and (2) under the condition that impulse negative bias and titanium injection are kept, nitrogen is pumped in with flow being instep increase from 0 to 20 sccm, a titanium-titanium nitride gradient transition layer is formed, and finally a pure titanium nitride layer is formed. The invention further discloses the nickel-titanium alloy medical equipment with the surface coating. The surface coating comprises the titanium transition layer, the titanium-titanium nitride gradient transition layer and the pure titanium nitridelayer from inside to outside; and content of titanium nitride is evenly increased in a gradient mode in the titanium-titanium nitride gradient transition layer.

Description

technical field [0001] The invention belongs to the technical field of biomedical materials, and in particular relates to a method for preparing a surface coating of a nickel-titanium alloy medical device and the nickel-titanium alloy medical device with the surface coating. Background technique [0002] Malocclusion is an oral disease with a high incidence rate in all countries in the world. This kind of developmental deformity is the deformity of dentition, jaw and craniofacial caused by congenital genetic factors or acquired environmental factors, such as diseases, bad oral habits, and tooth replacement disorders, during the growth and development of children. It not only affects the appearance of the face, but also affects the function of the mouth and jaw. In recent years, with the improvement of people's living standards, not only children, but also more and more adults are undergoing orthodontic treatment. [0003] In orthodontic treatment, orthodontic wire is a kin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C14/48C23C14/16C23C14/06A61C7/20
CPCA61C7/20C23C14/0084C23C14/0641C23C14/16C23C14/48
Inventor 童丽萍王怀雨傅劲裕朱剑豪罗哲民
Owner CHINA MOREFOUND TECH LTD SHENZHEN
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