The urate is a thin tube that connects the kidney and the vesicles, through which the urine gets out of the bladder in the bladder. The structure and function of the urethra ensures the normal functioning of the urinary system. Each kidney has its own urate, which leaves the kidneys pelvic and enters the bladder. The length of each ureter is about 30 cm, diameter is from 4 to 7 mm. The size of the urate in urolithiasis is very important. Larger stones than 4 mm can not flow freely with urine in the bladder and can lead to the development of kidney color.