What am I looking at?
Visual recognition
Slender 21-gauge introducer needle, visibly finer than an 18-gauge access needle and typically paired with a 0.018-inch guidewire as part of a micropuncture kit.
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21-gauge micropuncture access needle
Micropuncture access needle
Three-panel learning framework
Recognition, context, and distinction
What does it do, and where will I see it?
Use & procedural context
Creates the initial small-caliber puncture for vascular or selected nonvascular access. A 0.018-inch wire passes through the needle; the coaxial introducer/dilator then enables exchange to a 0.035- or 0.038-inch working guidewire. Common contexts include arterial or venous access, central lines, ports, nephrostomy, and biliary access.
What most clearly distinguishes it from similar devices?
Key distinctions
The 21-gauge needle starts a 0.018-inch micropuncture pathway rather than accepting a full-size working guidewire directly. It is one component of, not synonymous with, the complete micropuncture set.