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1前言我校第二附属医院放射科一台法国70年代后期、带影像增强和电视屏幕系统的750mACg－2X光机，采用6个接触形平面蜗卷弹簧来平衡X射线管头装置部分的重量，操作轻便灵活。该机使用3年后，弹簧相继出现疲劳断裂，使机器无法正常使用。在向国外购买原配件每个弹簧需1000多港元
1 Introduction Radiology Department of the Second Affiliated Hospital of our school A French 750mACg-2X light machine with an image enhancement and TV screen system in the late 1970s, using 6 contact plane spiral springs to balance the weight of the X-ray tube head device part The operation is light and flexible. Three years after the machine was used, the springs were fatigue fractured one after another, making the machine useless. More than 1,000 Hong Kong dollars per spring to buy original parts abroad