【摘要】 美国材料实验协会（American Society of Testing Materials, ASTM）F2052-21标准（对应中文标准YY/T0987.2）规定了磁共振环境中医疗器械磁致位移力的标准测试方法，在国际上被广泛接受和应用。该方法是用细线将被测植入物悬挂于磁场中，测量悬线相对竖直方向的偏转角，从而计算磁致位移力相对重力的大小。然而，当该方法应用于极轻型植入物测试时，很难满足悬线质量小于植入物质量的1%的要求。该文提出了一种基于配重修正的极轻型植入物磁致位移力测试方法：使用质量超出待测植入物质量的1%的悬线和夹持物，按照标准方法测量偏转角度，再使用待测植入物质量在被测物总质量中的占比对偏转角度进行修正，从而获得准确的测量结果。该文对配重修正法进行了理论计算和实验验证，结果表明，所提出的配重修正法能够有效测量极轻型植入物的磁致位移力偏转角。更多还原

【Abstract】 ASTM(American Society for Testing and Materials) F2052-21(Chinese corresponding standard titled as YY/T 0987.2) introduces a test method to measure the magnetically induced displacement force on medical devices in the magnetic resonance environment. This method has been widely accepted and utilized globally, which is intended for implantable medical devices that can be suspended from a string.The angular deflection of the string from the vertical is measured and thereby measuring out the magnitude of the magnetically induced deflection force relative to gravity. When applying this method on ultralight implants, it is practically almost impossible to use a suspension string that weighs less than 1% of the mass of the implant. That study proposes a method for measuring the magnetically induced displacement force on ultralight implants based on counterweight correction by using a string and clamp that exceed 1% of the weight of the implant. And then to measure the deflection angle according to the standard requirement, following that to correct the deflection angle by using the proportion of the mass of the implant under test to the total mass of the tested object, to obtain the measurement result. That study also provides theoretical calculations and experimental verification to the counterweight correction method, the results prove that the proposed method can effectively measure the magnetically induced displacement force on ultralight implants.更多还原