Flexible cystoscopes, also known as flexible cysto-urethroscopes or simply flexible cystoscopes, are medical instruments used in the field of urology to visually examine the inside of the urinary bladder and the urethra. Unlike rigid cystoscopes, which are straight and inflexible, flexible cystoscopes are designed to navigate and access the urinary tract's curved and narrow passages. These instruments are particularly useful for diagnosing and treating a variety of urinary tract conditions.