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In this design， because the gravity of the IV drip, the support arm is will bent downward. And then put the red sheet metal on the back of a fixed point. As time goes on, the end of infusion, then the IV drip turned light. Therefore, the red sheet metal restore its place, and make some clear voice. The voice can call attention to patient and nurse to know when the transfusion will be finished.
Wuxi City Jiangsu Province, China