Long term (indwelling, continuous) urethral catheters, is frequently left in place for a period of time.
The tube is attached to a gravity drainage bag to collect the urine.
The drainage bag may be either a , which is a smaller drainage device that attached by elastic bands to the leg. Intended for use in males, this is used during the day since it fits under clothes.
A larger gravity collection bag () may be used during the night or in females or bedridden patients and is hung at the bedside, below bladder but off floor.