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metal treatment

A technology for metal, metal objects, applied in the field of processed metal objects, which can solve the problems of impact, localized heat generation, porous rough surface finish, etc.

Inactive Publication Date: 2017-05-03
ACCENTUS MEDICAL LIMITED
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method provides good results, there are several problems in its application to implants, where parts of the surface have been coated for example by plasma spraying of metal powder, vapor deposition, or by fiber metal or sintered metal. The resulting porous rough surface finish
One problem is that the anodizing current flows predominantly through areas with porous rough surface finishes, resulting in localized heat generation; there is also a detrimental effect on the adhesion of plasma sprayed coatings

Method used

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Examples

Experimental program
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Effect test

Embodiment Construction

[0047] see figure 1 , the figure shows a hip implant 10 made of titanium alloy, with polished two end portions 11 and 12, and provided with a plasma-sprayed titanium powder coating, for example, with a thickness of about 0.5 mm (in the figure Indicated by cross-hatching) the central portion 15 of the porous metal coating. The roughness factor of the polished surface is about 1.5, however (from capacitance measurements) the roughness factor of the plasma sprayed part 15 may be about 100.

[0048] In the experimental sample, when having a plasma sprayed titanium coating with a thickness of 0.1mm, the roughness coefficient of the plasma sprayed surface is about 27; when having a coating with a thickness of 0.2mm, the roughness coefficient is 86; When the plasma sprayed titanium coating is 0.5mm, the roughness factor is 147. observed about figure 1 The roughness coefficients shown for the hip implant 10 are consistent with these experimental graphs.

[0049] By anodizing the s...

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Abstract

The metal implant (10) is treated by anodizing the surface (11, 12) in contact with the electrolyte and then briefly subjecting the anodized surface to a reverse voltage. During the first anodization stage the surface is passivated, and during the subsequent anodization stage pits are formed on the passivated surface layer. The rough parts (15) of the surface, especially those produced by plasma spraying of metal powder, are sealed by a watertight cover (20) during the at least partial anodizing process. After rinsing, the biocidal metal ions are then absorbed into the surface of the implant. This makes the implant biocidal. The use of a cover (20) enables a more uniform geometric distribution of the biocidal metal ions.

Description

technical field [0001] The present invention relates to a treatment method for rendering metal objects biocidal. In particular, but not exclusively, the invention relates to metal objects which have been treated to provide a reduced risk of infection when implanted by a surgical procedure. Background technique [0002] Metal implants may be inserted into body tissue, either soft or hard, through surgery. For example, in the case of cancer treatment of bone, the cancerous bone tissue is removed and a prosthetic metal implant is used to replace the removed portion of the bone. Implants are also used for partial or total replacement of bone in joints such as the hip and also in other fields such as dentistry and maxillofacial surgery. Implants for the foregoing (and other) purposes may be titanium metal or titanium alloys. Titanium metal or titanium alloys are biocompatible, relatively strong and relatively light. They can be given a polished glossy surface or, by plasma sp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D5/02C25D11/02C25D11/26A61L27/00
CPCA61L27/04A61L27/54A61L2300/102A61L2400/18C25D11/26C25D11/024C25D11/022C25D5/02C25D11/02A61F2/30
Inventor J.T.肖克罗斯A.D.特纳D.R.路易斯
Owner ACCENTUS MEDICAL LIMITED