What am I looking at?
Visual recognition
Very fine 0.018-inch guidewire, often supplied with a micropuncture set and visibly smaller than a 0.035- or 0.038-inch working guidewire; the distal segment is flexible and atraumatic.
02-02
0.018-inch micropuncture guidewire
Micropuncture guidewire
Three-panel learning framework
Recognition, context, and distinction
What does it do, and where will I see it?
Use & procedural context
An initial 0.018-inch wire passes through a 21-gauge micropuncture needle to secure access before exchange to a 0.035- or 0.038-inch working wire. Typical contexts include arterial or venous access, ports, dialysis access, fistulograms, nephrostomy, and biliary access.
What most clearly distinguishes it from similar devices?
Key distinctions
This is the initial micropuncture wire, not the definitive 0.035- or 0.038-inch working rail; its small caliber bridges the 21-gauge puncture to a coaxial dilator or transitional sheath.