Intravenous (IV) infusion therapy is a common medical management modality for many inpatients. During IV infusion, close attention needs to be paid to the infusion flow rate, and therefore patients' rest and sleep can be subjected to disturbance. If the nursing staff needs to control the infusion flow rate, concerns about side effects due to the completion or obstruction of the infusion flow will increase caregiving time and the workload of the nursing staff. After analyzing the working principles of IV sets, infusion pumps, and oximeters, we designed a device called "A design thinking for supervising intravenous infusion: Caring little-eye" in which the titration chamber of an IV set is clamped with a group of infrared sensors that monitor the infusion flow rate and reduce the occurrence of complications. This device is portable, easy to operate, and suitable for repeated use. With the collaboration of manufacturers and provided this device is approved by human experimentation, in future, the price of this device would be stable, thereby further improving the quality of care during IV infusion and reducing the workload of nursing staff.