Urethral dilators are medical devices used to gently widen and stretch the urethra, the tube that carries urine from the bladder out of the body. These devices come in a variety of shapes and sizes, ranging from simple cylindrical instruments to more complex designs with graduated sizes. Urologists use urethral dilators to treat a range of conditions, including urethral strictures (narrowing of the urethra), urethral trauma, and urinary retention.