What am I looking at?
Visual recognition
Fine inner needle nested within a flexible outer catheter; after puncture, the needle is removed while the soft catheter remains at the target.
01-09
Yueh needle-catheter system
Needle-over-catheter access
Three-panel learning framework
Recognition, context, and distinction
What does it do, and where will I see it?
Use & procedural context
Needle-over-catheter access that keeps a catheter at the target after puncture, reducing the chance of losing access during aspiration or drainage. Typical procedural contexts include abscess and ascites drainage, pleural fluid access, and cyst aspiration.
What most clearly distinguishes it from similar devices?
Key distinctions
The outer catheter remains at the target after the inner needle is removed, distinguishing this needle-over-catheter design from a simple access needle that leaves only a guidewire.