Final answer:
Needles used for the delivery of endoscopes into body cavities or joint spaces are referred to as trocars or cannula needles, essential for performing minimally invasive surgeries and diagnostics.
Step-by-step explanation:
Needles used to penetrate tissue for the delivery of endoscopes into body cavities or joint spaces are known as trocars or cannula needles. Endoscopes are sophisticated medical instruments that allow physicians to explore body cavities, perform surgeries such as arthroscopic surgery, and obtain samples like polyps for external examination. This minimally invasive technique involves inserting the endoscope through a small incision or natural orifice, illuminating internal areas with light transmitted through fiber bundles, and relaying the image back to the physician. Surgical tools can also be deployed through the endoscope for various procedures.