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Nickel-titanium tubular bone internal fixator and preparation method thereof

An internal fixator and tubular technology, which is applied in the field of medical devices, can solve the problems of poor adhesion between pure zirconium and pure titanium films and substrates, low film hardness, and easy peeling of films, so as to improve biocompatibility and durability. Corrosion performance, high bonding strength, and the effect of reducing dissolution

Inactive Publication Date: 2010-08-04
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the adhesion between pure zirconium and pure titanium films and the substrate is not very good, and the films are easy to peel off; in addition, the hardness of the films is also low

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The metal matrix surface of the nickel-titanium memory alloy tubular bone internal fixer of the invention has a layer of Ti / ZrTiN gradient coating with good biocompatibility and corrosion resistance. The Tj / ZrTiN gradient coating mentioned has a double-layer structure, which is composed of a Ti layer and a ZrTiN surface layer in contact with the surface of the nickel-titanium memory alloy tubular internal fixator. The thickness of the Ti bottom layer is 0.15-0.2 μm; the thickness of the ZrTiN surface layer is 2-2.5μm, the phases in the ZrTiN film mainly include ZrN and TiN, and a small amount of (Zr, Ti)N solid solution, ZrO 2 and TiO 2 . According to the scratch test, the film-substrate bonding force of the Ti / ZrTiN film is 146N. Its preparation steps are as follows:

[0021] 1) First process the tubular bone internal fixator with nickel-titanium memory alloy;

[0022] 2) the preparation method of the nickel-titanium tubular bone internal fixator of the described s...

Embodiment 2

[0027] The metal matrix surface of the nickel-titanium memory alloy tubular bone internal fixer of the invention has a layer of Ti / ZrTiC gradient coating with good biocompatibility and corrosion resistance. The Ti / ZrTiC gradient coating mentioned has a double-layer structure, which is composed of a Ti layer and a ZrTiC surface layer in contact with the surface of the nickel-titanium memory alloy tubular internal fixator, and the thickness from the bottom layer of Ti is 0.15-0.2 μm; the thickness of the ZrTiC surface layer is The phase in the ZrTiC thin film is a mixture of ZrC and TiC. According to the scratch test curve, the film-substrate bonding force of the Ti / ZrTiC film is 176N. Its preparation steps are as follows:

[0028] 1) First process the tubular bone internal fixator with nickel-titanium memory alloy;

[0029] 2) the preparation method of the nickel-titanium tubular bone internal fixator of the described surface magnetron sputtering Ti / ZrTi (C, N) gradient coati...

Embodiment 3

[0034] The metal matrix surface of the nickel-titanium memory alloy tubular bone internal fixer of the invention has a layer of Ti / ZrTiCN gradient coating with good biocompatibility and corrosion resistance. The Ti / ZrTiCN gradient coating mentioned has a double-layer structure, which is composed of a Ti layer and a ZrTiCN surface layer in contact with the surface of the nickel-titanium memory alloy tubular internal fixator. The thickness of the Ti bottom layer is 0.15-0.2 μm; the thickness of the ZrTiCN surface layer is 1-1.5μm, the phases in the ZrTiCN thin film are ZrCN and TiCN. According to the scratch test curve, the film-substrate bonding force of Ti / ZrTiCN film is 123N. Its preparation steps are as follows:

[0035] 1) First process the tubular internal fixator with medical nickel-titanium memory alloy;

[0036] 2) the preparation method of the nickel-titanium tubular bone internal fixator of the described surface magnetron sputtering Ti / ZrTi (C, N) gradient coating, ...

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Abstract

The invention relates to a nickel-titanium memory alloy tubular bone internal fixator with a Ti / ZrTi(C,N) gradient coating having good biocompatibility on the surface and a preparation method thereof. The surface of a metal matrix of the nickel-titanium memory alloy tubular bone internal fixator is provided with the Ti / ZrTi(C,N) gradient coating with good biocompatibility, wherein the Ti / ZrTi(C,N) gradient coating has a double-layer structure and consists of a Ti intermediate layer which is contacted with the surface of the nickel-titanium tubular bone internal fixator and a ZrTi(C,N) surface layer; the thickness of the Ti intermediate layer is 0.1 to 0.5 mu m; and the thickness of the ZrTi(C,N) surface layer is 1.0 to 5.0 mu m. The preparation method comprises the following steps: 1) processing the tubular bone internal fixator with a nickel-titanium memory alloy; and 2) performing surface pretreatment on the nickel-titanium memory alloy tubular bone internal fixator, and performing two-step magnetron sputtering treatment to obtain the Ti / ZrTi(C,N) gradient coating consisting of the Ti intermediate layer and the ZrTi(C,N) surface layer in sequence on the surface of the tubular bone internal fixator.

Description

technical field [0001] The invention relates to a nickel-titanium memory alloy tubular bone internal fixator and a preparation method thereof, in particular to a Ti / ZrTi (C, N) gradient coated nickel surface with good biocompatibility and wear resistance. A titanium memory alloy tubular internal fixator and a preparation method thereof belong to the technical field of medical instruments. Background technique [0002] At present, nickel-titanium memory alloy tubular internal fixator is widely used in human body implants, but, because nickel-titanium memory alloy contains nearly 50% atomic percentage of the carcinogenic Ni element, the medical community has a high demand for nickel-titanium alloy There are general concerns about the safety of human implants, and Ni will cause allergic reactions and tissue necrosis. Recently, there have also been clinical reports of sensitization of nickel-titanium alloy medical devices. In addition, the appearance of the nickel-titanium mem...

Claims

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Application Information

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IPC IPC(8): A61L31/08A61L31/02C23C14/35C23C14/16
Inventor 储成林苏理成余凤丹郭超盛晓波董寅生林萍华
Owner SOUTHEAST UNIV
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