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ASTM F897-2002(2013)  测量接骨用板和钉磨蚀的标准试验方法

标准编号:ASTM F897-2002(2013)
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中文标准名称:测量接骨用板和钉磨蚀的标准试验方法
英文标准名称:Standard Test Method for Measuring Fretting Corrosion of Osteosynthesis Plates and Screws
首次发布日期:确认有效
标准状态:Current
复审确认日期:2013
代替标准号:ASTM F897-02(2007)
语言:英文版,中文版
发布日期:2002
标准类别:美国材料与试验协会ASTM
中国标准文献分类法(中标分类CCS):
中国标准文献分类法(中标分类CCS):医药卫生技术 >> 医疗设备 >> 外科植入物、假体和矫形
标准页数:5P.;A4
标准简介:

4.1x00a0;It is well known from examination of implants after use that plates and screws used for osteosynthesis are subjected to metal loss due to corrosion at the plate-screw interfaces. One of the mechanisms of this corrosive attack is fretting corrosion due to relative motion (micromotion) between the screw heads and plate-hole countersinks.

4.2x00a0;It is also known that release of corrosion products into the tissues surrounding an implant may have adverse effects on local tissue or have systemic effects. Thus, it is important to minimize the amount of tissue exposure to corrosion products.

4.3x00a0;Screws and plates are available in different configurations in accordance with Specifications F543 and F382. This test method may be used to evaluate the effects of different combinations of screw and plate designs. As new materials and device designs are developed for use in the treatment of fractured bones, it is important to determine the effects these developments have on the amount of metal loss due to fretting corrosion.

4.4x00a0;This test method provides a standardized screening test for ranking metal plates and screws in terms of resistance to fretting corrosion and for determining the influence of different solutions on fretting corrosion rates.

4.5x00a0;This test method may also be used to generate corrosion products either for chemical analysis of the products or for testing for biological reactions to corrosion products using animal or cell culture methods.

4.6x00a0;It is well known that fretting corrosion rates depend on normal load or pressure, frequency, sliding amplitude, materials, surface treatments, and environmental factors. (4) Therefore, when determining the effect of changing one of these parameters (for example, material or environment), all others must be kept constant to facilitate interpretation of the results.

1.1x00a0;This test method provides a screening test for determining the amount of metal loss from plates and screws used for osteosynthesis (internal fixation of broken bones) due to fretting corrosion in the contact area between the screw head and the plate hole countersink area. The implants are used in the form they would be used clinically. The machine described generates a relative motion between plates and screws which simulates one type of motion pattern that can occur when these devices are used clinically.

1.2x00a0;Since the environmental and stress conditions used in this test method may not be identical to those experienced by bone plates in the human body, this test method may produce fretting corrosion rates that are lower or higher than those experienced in practice. The recommended axial load of 400 N was selected as being in a range where the amount of fretting corrosion is not sensitive to small changes in axial load (1).2 The combination of the recommended load and......

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添加时间:2013/10/19
 
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