Medical Hourglass / Hourglass

In some Asian countries, a lot of infusion glass bottles are thrown away as medical rubbish. Besides, in the hospital, nurses are too busy to take care of every patients at every seconds. Thus, patients unavoidably suffer from lots of medical troubles.
By changing the rubber plug of infusion glass bottle, Medical Hourglass aims to solve problems like this. Added with a round of groove on the top of the rubber plug, one infusion glass bottle is able to be connected to another one. Since a hole exists on the top of every used bottle, nurses only need to pour the proper amount of sand into the bottle which takes the exact time to leak from t