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A urinary catheter is made of natural rubber, silicone rubber, or polyvinyl chloride (PVC).pipingIt is possible to insert a catheter into the bladder via the urethra to drain urine. After the catheter is inserted into the bladder, there is an airbag near the tip of the catheter that fixes the catheter in the bladder and prevents it from dislodging. Furthermore, the drainage tube is connected to a urine bag to collect the urine.

The catheter model is divided into 13 specifications from 6F to 30F according to the circumference of the outer diameter. The commonly used adult catheters include four models: 12F, 14F, 16F, and 18F. The F number is the millimeter of the outer circumference. It is a legal unit. F stands for French. The conversion formula is F = 2πr. Roughly, F (millimeters) = 3 times the outer diameter (millimeters).