Final answer:
The general term for using a thin tube threaded through a vessel for diagnosis or repair is endoscopy. Endoscopes are medical devices used by doctors to look inside the body for diagnostic or surgical purposes.
Step-by-step explanation:
The general term for using a thin tube threaded through a vessel for diagnosis or repair is endoscopy. Endoscopes are medical devices that allow doctors to look inside hollow organs or body cavities for diagnostic or surgical purposes. They use fiber optic technology to transmit light and images, and can also be used to collect biopsies or remove growths.