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In contemporary interventional radiology practice, Percutaneous Transhepatic Cholangiography (PTC) has long bid farewell to the era of blind puncture, ushering in a new era of multi-modal precision image guidance. As the core instrument of this transformation, the Chiba needle-through its deep integration with ultrasound and DSA (Digital Subtraction Angiography) technologies-has greatly enhanced the accuracy and safety of PTC procedures. The advantage of ultrasound guidance lies in its real-time capability and lack of radiation. Before the procedure, the physician uses a high-frequency ultrasound probe to conduct a comprehensive scan of the liver, accurately measuring the diameter of bile ducts at all levels, identifying the most prominently dilated target duct, and planning the shortest puncture path that avoids intrahepatic vessels. The Chiba needle exhibits excellent visibility under ultrasound; its needle tip, with strong echogenic properties, allows the physician to clearly observe the advancing process on-screen, ensuring it always progresses along the preset route until it reaches the target bile duct.

However, while ultrasound excels at guiding the puncture path, it has limitations in displaying the overall biliary architecture. This is where DSA becomes crucial. After the Chiba needle successfully pierces the bile duct and bile return confirms entry, the physician slowly injects contrast medium through the fine lumen of the Chiba needle. The patient is then moved to the DSA suite, where dynamic fluoroscopy perfectly reveals the full picture of the biliary system. From the细小的 branches of the intrahepatic bile ducts to the common hepatic duct, common bile duct, and even the opening into the duodenum, any stenosis, stone, or tumor compression can be clearly captured. This dual-modality combined model of "ultrasound-guided puncture plus DSA contrast diagnosis" fully leverages the fine, flexible characteristics of the Chiba needle-avoiding the potential targeting偏差 of single-modality ultrasound guidance while overcoming the high risks of blind puncture under DSA alone.

In practical operations, the material and craftsmanship of the Chiba needle provide critical support for this dual-modality guidance. High-quality medical stainless steel ensures clear echogenicity under ultrasound, while its smooth inner lumen guarantees that contrast medium can be smoothly injected without excessive resistance or turbulence-induced artifacts. This perfect combination of technology and instrumentation enables physicians-even when facing complex hilar tumors causing high-level obstructions-to precisely complete PTC with the Chiba needle, providing the most accurate imaging basis for subsequent interventions. This truly achieves the perfect unity of minimal invasiveness and precision, securing precious treatment opportunities for patients.