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The objective of this study is to elucidate the issue of dropping during the flushing of closed suction catheters and to improve awareness of dropping prevention. Simulating a subject equipped with a ventilator, a comparative study on the causes of dropping during flushing was conducted using three different closed catheters widely used in the medical field. The results indicated significant differences in adult catheters based on ventilation volume and mode, with some cases showing significant differences according to PEEP (positive end-expiratory pressure) and angle. In comparisons involving only pediatric catheters and combined comparisons of adult and pediatric catheters, significant differences were observed in the amount of secretions dropped based on ventilation volume and ventilation mode. These differences revealed structural issues with the catheters. Specifically, it was suggested that flow from the ventilator directly affects the catheter tip and that saline buildup in the anti-drop valve can cause dropping. Furthermore, dropping issues were observed depending on the technique of the individual performing the suction. Based on the novel insights gained from this study, there is consideration to form a research team for the development of an improved device in the future. [ABSTRACT FROM AUTHOR]