The cystoscopes can be either rigid (used in females animals) or flexible (used in male dogs). (vetspecialists.com)
The endoscope which is used in the urinary tract is called a «cystoscope» and must penetrate the very narrow urethral opening of a small animal. (marvistavet.com)
The only other ways to obtain sample stones are by surgically removing the stones from the bladder (the traditional method), retrieving them by sending a cystoscope up the urethra, or by using laparoscopy to send a mechanical arm through a small incision into the abdomen and then into the bladder to retrieve them. (marvistavet.com)