Chinese Journal of Tissue Engineering Research ›› 2012, Vol. 16 ›› Issue (16): 2964-2966.doi: 10.3969/j.issn.1673-8225.2012.16.027

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Breakdown potential testing of occluders  

Cao Bian-mei, Hu Guang-yong   

  1. Beijing Institute of Medical Device Testing, Beijing  101111, China
  • Received:2012-01-12 Revised:2012-02-13 Online:2012-04-15 Published:2012-04-15
  • About author:Cao Bian-mei☆, Doctor, Intermediate engineer, Beijing Institute of Medical Device Testing, Beijing 101111, China cbm04@163.com

Abstract:

BACKGROUND: Although current metallic implantable materials show good corrosion resistance, the corrosion resistance of many devices may change during the process of production and treating.
OBJECTIVE: To study the application of the potentiodynamic polarization technique in testing the corrosion behavior of occluders in vitro.
METHODS: Four different occluders were subjected to anodic polarization scan within the potential range from rest potential to  800 mV in simulated body fluid (pH=7.4). The differences of different occluders and different testing results were analyzed. Occluders A and B had the same shape, but the surface area of steel sleeve and total surface area were different; occluders C and D had the same size and total surface area, but had difference in the shape. These four kinds of occluders were made of the same material.
RESULTS AND CONCLUSION: Form and size influenced the breakdown potential of occluders. Changes in the form and size contributed to the area ratio of stainless steel to nickel titanium wire, resulting in the variation of galvanic potential and galvanic current density to affect their breakdown potential. If two occluders made of the same material have different forms or sizes, the galvanic corrosion will be influenced and their breakdown potential should be tested separately.

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