Structural Comparison Of Chiba Needle Tips With Non-Image-Guided Needles And Tru-Cut Cutting Needle Tips
Jul 04, 2026
Why Is the Chiba Needle Irreplaceable?
https://radiopaedia.org/articles/chiba-needle
Commonly used puncture needles can be divided into three categories by tip function: fine needle aspiration (Chiba/Turner bevel needles), cutting needles (Tru-Cut side-notch needles), and coaxial/interventional drainage needles (trocar tip or pointed flat tip). Understanding the uniqueness of the Chiba needle tip aids in rational selection.
|
Needle Type |
Tip Form |
Bevel Angle |
Main Use |
Tip Characteristics |
|---|---|---|---|---|
|
Chiba |
Elliptical bevel opening, thin-walled |
~25° |
FNAB, PTC, drainage, injection |
Sharp, low trauma, flexible, good negative pressure transmission |
|
Turner |
Elliptical bevel opening |
~45° |
FNAB / small tissue fragments |
Stronger but higher puncture resistance |
|
Tru-Cut (cutting) |
Inner stylet bevel + side notch + outer cannula cutting edge |
Inner ~30–45° |
Histological core biopsy (CNB) |
Obtains tissue strip; tip does not主导 aspiration |
|
Franseen |
Tri-faceted serrated end (trephine-style) |
- |
Bone/hard tissue biopsy |
Drills hard tissue; non-aspiration |
Unique Advantages of the Chiba Needle Tip
Flexibility: 21G–23G Chiba needles have thin walls, allowing slight elastic bending when passing over the upper edge of ribs or微调 direction along curved paths - a capability粗 cutting needles lack.
Low invasiveness: Fine tip + small outer diameter cause minimal damage to blood vessels and bile ducts, suitable for operations adjacent to critical structures (e.g., initial PTCD puncture, portal vein puncture).
Versatility: A single Chiba needle can perform cytological biopsy, contrast injection (cholangiography/lymphangiography), drug injection (PEI ethanol injection for small hepatocellular carcinoma), and guidewire introduction.
Limitations and Complementarity
The Chiba needle tip cannot obtain sufficient histological strips for immunohistochemistry or genotyping. For solid masses ≥1.5 cm, an 18G cutting needle biopsy is needed. Often, a Chiba needle is used first for localization or to establish a coaxial channel, then a Tru-Cut needle is inserted for sampling - the two complement rather than replace each other in clinical practice.
In short, the Chiba needle tip embodies the design philosophy of "thin, sharp, flexible, and patent," making it a fundamental component of the minimally invasive interventional diagnostic system.
