Methods The automatic infusion alarm device was subtly reformed according to the principal of the character of the spring that the different gravity caused its length to be different.

方法：该输液自动报警器利用了弹簧受力拉升，不同质量的物体使弹簧长度改变不同的原理，巧妙地将弹簧秤进行了改装。

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The products should be used with disposable venous infusion setneedle, and usually apply to gravity transfusion.

该产品与一次性使用静脉输液针配套使用，主要用于临床重力式输液。

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