Chiba Needle — The Essential Fine Needle For Interventional Radiologists

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The PTC needle, fully named Percutaneous Transhepatic Cholangio(graphy) Needle​ and commonly known as the Chiba Needle (千叶针 / Chiba Biopsy Needle), originated from Chiba University in Japan. It is one of the most classic and widely used fine-needle aspiration (FNA) puncture needles in interventional radiology. Belonging to the Fine Needle Aspiration (FNA) category, it is typically made of medical-grade 304 or 316L stainless steel, featuring a thin-walled, hollow shaft with a sharply ground beveled tip. Outer diameters commonly range from 0.7–1.5 mm (approx. 20G–18G; 22G–25G for cytology), with lengths of 15–30 cm to accommodate targets at varying depths.

Clinically, the PTC/Chiba needle serves two core purposes:

Percutaneous Transhepatic Cholangiography (PTC):​ Under ultrasound or fluoroscopic guidance, the needle is advanced into a dilated intrahepatic bile duct. Return of golden-yellow bile confirms entry; contrast is then injected to outline the intra- and extra-hepatic biliary tree and identify the level/site of obstruction - a gold-standard preliminary study in obstructive jaundice.

Image-Guided Fine Needle Aspiration Biopsy (FNAB):​ A 22G–25G ultra-fine Chiba needle with negative-pressure suction is used to aspirate cells from liver, lung, thyroid, breast, lymph nodes, and other deep or superficial lesions for cytopathologic and sometimes molecular/genetic testing. Positive diagnostic rates reach 85%–95%, with significantly lower rates of bleeding or pneumothorax compared with core biopsy needles.

A typical Chiba needle consists of a stylet (inner obturator), cannula (outer shaft), and a graduated hub. Premium products feature an ultrasound echo marker​ (micro-groove or coated ring) near the tip for improved tip visualization under sonography. The hub is usually transparent polycarbonate to allow the operator to observe returning fluid (bile, blood, cystic fluid). Some models include a sliding depth stop​ to preset insertion depth - particularly useful in obese patients or deep-organ punctures.

Compared with Tru-Cut core biopsy needles, Chiba needles offer:

✅ Finer caliber → minimal tissue trauma, less pain, can be passed between ribs or around bony structures

✅ Suitable for multiple passes

❌ Only yields cytology (not histology/architectural detail) - often combined with coaxial technique: Chiba needle localizes the target → micro-guidewire exchanged → larger bore needle or drain inserted

Operational highlights:

Choose appropriate Gauge: 21G–22G for PTC/biliary access (with 0.015″–0.018″ micro-guidewire); 22G–25G for FNA; 18G–20G for cyst/abscess aspiration

Advance under real-time imaging; upon reaching target, remove stylet, attach syringe with gentle suction (2–5 mL), gently fenestrate 2–3×, release suction before withdrawing

For PTC: instruct patient to hold breath during insertion; inject small amounts of contrast while withdrawing to opacify ducts - avoid blind deep puncture which risks vascular injury or bile leak

Modern PTC needles are supplied sterile, single-use, pyrogen-free, latex-free. High-end versions offer MRI-compatible non-ferromagnetic alloys​ (Nitinol/Titanium) for MRI-guided interventions. For distributors and hospital purchasers, understanding the Gauge×Length matrix, compatible guidewire sizes, and brand interoperability is foundational to proper departmental supply.

In summary, the PTC/Chiba needle - with its minimalist design - supports diagnostic aspiration, cytology biopsy, and initial access for interventional tract creation, making it the true "first needle" of interventional radiology.