1. Clinical Pain Points

Intrahepatic cholangiolithiasis in stationary phase lacks obvious clinical manifestations, so early screening rate is low. Many patients are diagnosed only when complications such as biliary cirrhosis, recurrent cholangitis or malignant transformation occur. Non-invasive imaging has limitations for subtle annular stenosis and small intrahepatic stones. ERCP cannot reach peripheral intrahepatic ducts. The lack of safe, low-trauma diagnostic tools restricts early screening workflow. Many medical institutions regard PTC as an interventional treatment tool rather than an early diagnostic screening method, resulting in delayed diagnosis of patients who are easily misdiagnosed as hepatitis or gastritis. Meanwhile, the global market lacks standardized PTC needle product series, and product quality varies widely among suppliers.

2. Working Principle

PTC needle is a percutaneous transhepatic puncture instrument for cholangiography. Under image guidance, it enters intrahepatic bile duct and injects contrast medium to visualize the whole biliary tree. It can capture the classic X-ray signs of early intrahepatic stone disease: annular stenosis at hepatic duct bifurcation, stone shadow in proximal dilated duct, partial duct non-development and asymmetric spindle-shaped or dumbbell-shaped dilation. It can also provide evidence for early malignant change and biliary cirrhosis. As a minimally invasive diagnostic tool, it fills the gap between non-invasive imaging and surgical exploration, providing direct anatomical basis for early screening and differential diagnosis.

3. Classification of PTC Needles for Early Screening

Fine screening needles (0.25–1.2 mm): the core model for early screening, low trauma, suitable for patients with suspected stationary intrahepatic stones and normal or slightly dilated bile ducts. Medium comprehensive needles (1.2–5 mm): for patients with positive screening results and need further interventional preparation. Large customized needles (>5 mm): for therapeutic conversion, not recommended for primary screening. Surface treatment options: polishing for low friction, electroplating for durability, ultrasonic cleaning for high cleanliness. Products are ISO9001 certified, customizable by 2D/3D drawings or samples, with standard or customized packaging.

4. Operation Guide for Early Screening Scenarios

Screening population: patients with unexplained upper abdominal discomfort, persistent liver function abnormality, negative gastroscopy and negative hepatitis serology. Preoperative screening: coagulation function, B-ultrasound primary screening. Adopt fine PTC needle and ultrasound guidance. Single puncture attempt is preferred to reduce trauma. After bile aspiration confirmation, inject contrast slowly and take multi-angle films. After imaging, withdraw needle and observe for complications. If PTC shows typical stone and stenosis signs, arrange follow-up treatment; if imaging is normal, exclude biliary origin and transfer to gastrointestinal or hepatology department.

5. Practical Experience

In early screening practice, fine-needle PTC has acceptable safety and high diagnostic yield for stationary intrahepatic cholangiolithiasis. Many cases previously misdiagnosed as gastritis and chronic hepatitis are finally confirmed by PTC. Operators should avoid overusing PTC for low-risk patients; it is positioned as a second-line differential examination after B-ultrasound and CT. When the imaging shows mild asymmetric dilation without obvious filling defect, combined with long-term follow-up is better than immediate surgical intervention. Standardized screening workflow can detect lesions before irreversible biliary cirrhosis develops.

6. Summary

PTC needle is a key diagnostic consumable for early screening of intrahepatic biliary diseases. It solves the underdiagnosis problem of stationary intrahepatic cholangiolithiasis caused by non-specific symptoms. Fine-gauge needle design ensures minimal trauma for screening purpose. The direct cholangiography images provide reliable evidence for differential diagnosis. Rational positioning of PTC as a diagnostic tool will improve the early detection rate of biliary tract lesions.

7. Prospect and Suggestion

In the future, PTC needle will develop toward ultrasound visible, disposable sterile integrated screening sets. Manufacturers should enrich standard fine needle series and keep flexible customized service. Medical institutions should build standardized screening pathways for unexplained liver function abnormality, incorporating PTC into differential diagnosis of biliary tract diseases. Industry associations can formulate unified technical specification for PTC needle production and clinical application. PTC needle will play a more important role in the early diagnosis of intrahepatic stones, biliary stricture and early cholangiocarcinoma globally.

< img alt="news-1-1" src="/uploads/24240/news/202604241539186d0ff.png " />