The composition of the human body is the most complex among the rest of living organisms, despite all the complexities in the composition but in a constant balance, by the combination of the devices in his body, which work always regularly and harmony so as not to overwhelm the work of any of the other, each of these devices are responsible for doing the work of a particular function to be of competence, as a process of digestion of food by the digestive system, and blood transfusion in all parts of charge by the body's circulatory system, and the process of breathing, which are respiratory responsibilities, and disposal of fluids and excess salts from the body which It is done Saliva urinary tract. The urinary system is one of the important organs of the body, which means doing a lot of functions very important to the human body, one of the most important tasks, rid the human body of the toxins in it, specifically toxins that are derivatives of ammonia or as known as urea, and has a significant role in maintaining the acid balance within the body, working on the balance between acids and bases in the blood, as it maintains the water and the salt concentration within the body, and works to rid the body of waste and excess fluid from his need, in addition to a lot of important functions, and consists of the urinary system in human from several parts of a : Alclet N, bladder, urethra, and ureters. The ureter is a muscle channel that connects between the kidney and the bladder, so that each kidney in the human body is linked to a single ureter that connects it to the bladder. The length of the ureter is 25 cm, can reach 35 cm, and the diameter of 3 to 4 mm, It consists ureter of three layers, namely: the outer layer, a serous layer. The middle class, made up of muscles. The inner layer, a layer of mucus. The most prominent health problems that may be exposed to the ureters are the presence of gravel, and these stones are a group of salts to become small balls, and the diameter of a few millimeters to a few inches, and these stones in the kidney and then go out to the ureter, Dam where the urethra, causing him pain and burning during urination. Therefore, the person who suffers from this problem should check with the doctor immediately to diagnose his condition and to find out how to treat it. One of the methods used by the doctor to treat the gallstones is the ureter catheter, and the ureter catheter is a pillar that is a long flexible tube that is passed from the kidney to the bladder , so passes from college around the pebble up to the bladder, and then Gallstones exceeds even allow the discharge of urine from the kidney, which they are placed in the ureter to expand the urethra in the ureter until the blockage does not happen to him because of the presence of gravel in it.