Final answer:
The gauge size with the biggest lumen is the one described as 'thick walled, large lumens, high pressure, lack valves'. A larger gauge size means a smaller gauge number, indicating a larger diameter and lumen suitable for high-pressure scenarios without valves.
Step-by-step explanation:
The question pertains to determining which gauge size has the biggest lumen. In the medical field, specifically when dealing with needles or catheters, the gauge size refers to the thickness of the needle or catheter. The rule of thumb is that the smaller the gauge number, the larger the diameter and lumen. From the options given, the one that describes a large lumen is 'thick walled, large lumens, high pressure, lack valves'. Therefore, a larger gauge size, which corresponds to a smaller number, will have the biggest lumen suitable for high-pressure situations without valves. It is important for healthcare professionals and students to understand gauge sizes, as they are critical in medical procedures, ensuring that the right size is used for the correct application.