Instructions for Care of Urinary Catheter Download PDF, 1.8MB, PDFA urinary catheter is a narrow and flexible tube inserted into the bladder to drain out urine continuously. With this tube, you will not have the urge to pass urine.Read on to find out more about the different parts of a urinary catheter (e.g. balloon, drainage bag), how you can care for your catheter and drainage bag, and the items you will need to prepare for changing your urinary catheter at home. [Please download the PDF file if you are unable to view the image below.]