Final answer:
The portable device mentioned is a type of endoscope, used in medical procedures to illuminate and observe internal body parts, supporting surgeries, and sampling for diagnosis.
Step-by-step explanation:
The portable device that can be fitted with a one-time use disposable laryngoscope blade sleeve that fits over the light source is likely to be a type of endoscope. Endoscopes are medical devices used to explore the body through various orifices or through minor incisions, transmitting light via a fiber bundle to illuminate internal parts. The reflected light is then transmitted back through another fiber to allow medical practitioners to observe the inside of the body. These devices are essential in procedures like arthroscopic surgery, where, for example, cutting tools are attached to the endoscope allowing for surgery on the knee joint. Furthermore, endoscopes can be used to obtain samples for external examination, such as lassoing an intestinal polyp.