摘要
背景:尽管目前使用的金属植入材料均呈现良好的耐腐蚀性能,但许多器械的生产处理过程可能会改变其成品器械的腐蚀性能。目的:应用动电位极化技术测试体外不同型号心脏封堵器的击穿电位值。方法:将A、B、C、D4种不同型号的封堵器分别置于pH值为7.4的模拟生理溶液中,运用循环动电位极化方法,从静止电位至800mV(相对于参比电极)的电位对样品进行阳极极化扫描,分析不同封堵器间的差异及测试结果的差异。A型和B型的封堵器的外形相同,但钢套表面积及总表面积不同;C型和D型的封堵器的各部位尺寸及总表面积相同,但外形不同,4种封堵器材质相同。结果与结论:外形相同,尺寸不同,封堵器的击穿电位不同;外形不同,尺寸相同,封堵器的击穿电位也不同。外形和尺寸的变化会影响不锈钢与镍钛合金丝的面积比,导致其间的电偶电位及电偶电流密度发生变化,进而影响封堵器的击穿电位。因此在检测封堵器的击穿电位时,如果两种封堵器所用材质完全相同,但外形或尺寸不同,应该分别检测其击穿电位。
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.
出处
《中国组织工程研究》
CAS
CSCD
2012年第16期2964-2966,共3页
Chinese Journal of Tissue Engineering Research
