Surface treatment method of medical metal material

Abstract

The invention provides a surface treatment method of a medical metal material. The surface treatment method includes the steps of: performing mechanical polishing and oil dirt removal treatment to thesurface of a medical metal material and performing texturing to the surface of the medical metal material with laser so as to ablate or induce surface structures which are in micron / nano-scale and are formed by stacking a plurality of rings. Compared with the prior art, the method has the advantages as follows: 1) through the laser texturing on the surface of the medical metal material, the method can process the material directly in air environment without pollution and noise, the formed patterns being uniform and ordered; 2) friction performance of the medical metal material can be selectively reduced or enhanced, thus effectively broadening the application range of the medical metal material.

Description

technical field [0001] The invention relates to the technical fields of mechanical manufacturing and surface processing of medical devices, in particular to a surface texture and a preparation method for precisely regulating the surface tribological properties of medical metal materials. Background technique [0002] Medical metal materials, such as titanium, titanium alloys and stainless steel, are widely used as biological implants in the field of biomedicine because of their high strength, bending fatigue resistance and good toughness. Commonly used medical metal materials are mainly titanium alloys and stainless steels. However, titanium alloys have poor wear resistance in physiological environments and under load conditions, especially sensitive to adhesive wear. The surface of titanium alloys has biological inertia and poor wear resistance. Damage performance will bring many negative effects during long-term use as a biological implant. Corrosion and wear of other med...

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Problems solved by technology

[0004] However, the passivation film on the surface of the medical metal often causes poor bonding between the base alloy and the coating, making the thickness of the anodized film generally less than 1 μm, which cannot meet the requirements of practical applications in many cases; physical / chemical vapor deposition , Ion implantation method and thermal oxidation method need to maintain a certain high temperature in the process of coating preparation, which changes the structure of the substrate and the coating to a certain extent, making the mechanical properties of the titanium alloy substrate significantly worse; physical / chemical vapor phase The preparation conditions required by the deposition and ion implantation methods are relatively harsh, and the cost of modifying titanium alloys is relatively high; the thermal oxidation method consumes a lot of energy and takes a long time to obtain a coating that cannot guarantee uniformity

In the process of preparing the coating by the micro-arc oxidation method, it will greatly affect the mechanical properties of the substrate, especially the fatigue performance, and consume a lot of energy.

As an implant, the biochemical stability of the surface of medical metal materials is particularly important. Unstable coatings and the release of ions will cause many patients to have a series of problems after implant surgery, such as the relationship between the implant and bone tissue. Combined with problems such as slow speed, severe inflammation, loosening or even falling off of the implant, the recovery effect of the surgery cannot meet expectations, etc.

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