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IR: Survival Guide (Section 2)

  1. What are three main types of puncture needles?
    One-part

    Two-part

    Sheathed
  2. Describe a one-part puncture needle.
    They have a cutting bevel.

    They are commonly used as a prelude to passage of a guidewire into a vessel, and for simple access procedures.
  3. Describe a two-part puncture needle.
    They have an outer shaft and inner stylet, which extends up to or beyond the tip of the outer shaft.

    Commonly used for deeper punctures, especially when using smaller-calibre needles.
  4. Describe a sheathed puncture needle.
    They feature a plastic outer sheath. This usually stays in place after the needle is removed (think intravenous cannula). The needle component may be one- or two-part.
  5. Name an aspect of a one-part puncture needle to consider with care when placing.
    The sharp cutting bevel should not swivel from side-to-side as you're looking for the vessel - this can tear the vessel wall.
  6. How are puncture needles generally described?
    by their outer diameter.

    Sizing is counterintuative: the larger the number, the smaller the needle.
  7. Which puncture needle size is the smallest in most IR departments?
    21 gauge
  8. How does the inner diameter of a puncture needle correlate to the gauge?
    In general, the higher the gauge, the smaller the lumen.

    For example, a 21G will only take a 0.018-inch wire.
  9. What do vascular procedures nearly always start with when it comes to the puncture needle?
    a 19G single-part needle

    This allows passage of a standard 0.035-inch guidewire.
  10. What type of puncture needle do many non-vascular procedures use?
    a sheathed needle system, usually a bit bigger. Like a 16G.
Author
nenyabrooke
ID
360564
Card Set
IR: Survival Guide (Section 2)
Description
Essential Equipment: Puncture needles, Biopsy needles, Access Kits, Guidewires, Catheters, Microcatheters, Sheaths and guide catheters, Tabs, hubs, and connectors, Pump Injectors, Snares, Angioplasty balloons, Inflation handles, Stents, Stent grafts and covered stents, Inferior vena caval filters, Embolization, Drainage catheters, Ureteric stents
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