Angle Effect to Dropping of Dew in Closed Suction Catheters

Abstract

Intratracheal aspiration in a patient on ventilation is generally performed using a catheter. Of late, closed suction systems have been used more frequently than open systems. To remove tracheal secretions through the intratracheal tube, catheter suction is used, and the suction catheter may be of the closed- or open-type. The catheters are cleaned by flushing with sterile 0.9% saline, resulting in dropping of dew. This phenomenon is caused by some factors: influence of flow, clogging of the suction tube, problem of manipulation of flushing and angle between the intubation tube and the connection port. But this dropping has not yet been investigated. In this study, we focused at this angle and we used the test lung which is simulated machine on behalf of patient. We consider two situations adult and child, also two types of catheters Eco-Cath and Ty-care. In child case we consider elbow-type suction catheters and Y-connector type. The angle was set at 0 ° , 20 ° , 40 ° , 60 ° , and 90 ° , and we observed the difference between Eco-Cath and Ty-care. In adults difference is significant (p 0.001), In 90 ° between Tracheal intubation and Tracheotomy (p ≈ 0.26). In child difference is significant (p 0.001), In 90 ° between Tracheal intubation and Tracheotomy (p ≈ 0.15). In child case we observed dependency of angle on various conditions too. The relation of the angle and dew was clarified.