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When the patients are in infusion, there is one condition that often confuse them,the liquid medicine has drained off but it not being found in time .It may allow the air flow into the patients’ body and threaten the patients’ safety.
Putting one small ball in the Murphy's dropper can easily solve this problem . During the infusion,the small ball will float on the liquid surface .Once the liquid drops out ,the buoyancy disappears, the small ball will block the nozzle below , prevent the air entering the patient’s body to ensure the patient’s safety.