ABSTRACT
Objective:To explore the significance of the marked capacities on balloon catheters in different types. Methods: To choose the type 8 to type 20 double-cavity balloon catheters, different doses of 0.9%sterile saline was injected according to the capacities marked on different types of balloon catheters, the shapes and the largest volumes in which balloon catheters could endure were observed under different doses of fluid. Results:The optimal injected saline dose was the marked capacities for type 8 to 14 balloon catheters, but not for type 16, 18 and 20 balloon catheters. Conclusion:The marked capacities of type 8 to 14 balloon catheters were the optimal injected doses, the optimal injected doses for type16 balloon catheter were 15 to 20 ml respectively, at the same time, the optimal dose of type 18, 20 was 20 ml. The largest volumes which balloon catheters could endure under different doses of fluid is not the same yet.