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There's a problem after the intravenous drip runs out - the blood countercurrent. That is because the pressure in the drip bottle is different from the pressure of the human body. Ordinary, the nurse should help the patients immediately, but often ignoring the blood countercurrent problem because of busy. Which does not cause life-threatening but cause psychological discomfort of patients. Use the liquid buoyancy of the drip bottle, the small ball float when intravenous dripping and does not hinder the intravenous drip. When finishing, the ball will lower and block nozzle, to avoid the occurrence of pressure difference caused blood countercu