How many hydrophilic coated contrast catheters are typically used?

Hydrophilic coated contrast catheters are usually used in 1 piece. Only 1 hydrophilic coated contrast catheter is used, this is because the hydrophilic coated contrast catheter will be damaged after many times of use in the surgery, such as friction, scratches, etc., which will lead to its performance deterioration or even damage. In addition, hydrophilic coated contrast catheters are expensive, so to save costs and minimize waste, only 1 is needed.