This is a balloon infusion bag. Filled with helium, the balloon will rise while the infusion fluid is being released. Children are usually afraid of the injections during IV therapies. With a balloon holding the fluid, not only does it bring more joy to the treatment process, it also gives an indication when the infusion of liquid is about to be completed. While giving the injection, the balloon infusion bag distracts the child and lessens the fearfulness of the injection process. During the infusion process itself, doctors and nurses can monitor the finishing time of the treatment from a distance by looking at the height of the balloon. After the treatment, the nurse will remove the infusion bag and pull out the built-in balloon string to make it a real balloon as a souvenir for the child.