Suction catheters or sets are medical devices used to remove unwanted fluids or debris from the body during surgical procedures. They fall under the category of suction devices and work by creating a vacuum that draws the fluid into a container or through a tube.

Suction catheters can be classified into two main categories: closed system suction catheters and open system suction catheters. Closed system suction catheters are designed to reduce the risk of infection by keeping the catheter enclosed in a sterile container until it is ready to be used. Open system suction catheters, on the other hand, do not have a closed container and are typically used for non-sterile procedures.

Overall, suction catheters or sets are essential in removing unwanted fluids and debris during surgical procedures and preventing complications.