Final answer:
The instrument called a cystoscope is used to view the interior of the bladder and is a type of endoscope designed for urological examinations.
Step-by-step explanation:
The medical term for the instrument utilized to view the interior of the bladder is a cystoscope. This is a type of endoscope specifically designed for inserting into the bladder through the urethra. Endoscopes utilize lighting systems and imaging technology to enable doctors to observe and diagnose internal issues within hollow organs or body cavities. In addition to visualization, these devices often have channels for surgical instruments, which can be used for procedures such as removing polyps or collecting biopsies.