S+ provides a convenient and reliable solution for patients who suffer from having many IVs for multiple days. Air embolisms and blood flowing back into the IV frequently happen when it is changed too late or carelessly. This may cause heart issues or pain. By simply bending the tube into an S shape, S+ ensures the IV solution will always stay at a safe level to prevent blood flowing back and air embolisms. This clever and sustainable solution guarantees 100% prevention without any additional device. Patients can finally sleep and rest well without worrying about changing the IVs too late. Worry less, rest better and recover faster with S+.