Integrated Application Of Catheter System in Laparoscopic Left Lateral Segmentectomy

Integrated Application of Catheter System in Laparoscopic Left Lateral Segmentectomy: From Drainage to Perfusion – A Paradigm Upgrade

The success of laparoscopic left lateral segmentectomy is not only attributed to high-definition visualization and advanced energy devices, but also relies fundamentally on the precise application of a series of specialized catheter systems. These catheters have evolved beyond their traditional drainage function, becoming active tools for control, monitoring, and protection​ during surgery. This article focuses on key catheter technologies in laparoscopic liver resection, analyzing how they enhance the precision and safety of the procedure.

I. The "Triple Role" of Intraoperative Catheter Systems

1. Preplaced Biliary Drainage Tube: The "Safety Valve" for Prophylactic Biliary Decompression

For complex lesions adherent to or invading the left hepatic duct, or for patients with obstructive jaundice, preoperative percutaneous transhepatic or endoscopic nasobiliary drainage (ENBD) is standard. During laparoscopic surgery, a micro-biliary catheter inserted via the cystic duct​ offers a novel approach. Before transecting the hepatic pedicle, injecting methylene blue through this catheter allows for real-time visualization of biliary anatomy and its variations​ under fluorescence laparoscopy, preventing iatrogenic injury. Postoperatively, this catheter serves as a decompression pathway, significantly reducing the risk and severity of bile leaks.

2. Portal Vein Perfusion Catheter: The "Targeted Channel" for Regional Therapy

For hepatic adenomas or certain metastases, a catheter can be super-selectively advanced into the left portal vein branch​ via an ileocolic vein tributary or direct puncture. After the hepatic pedicle is divided, regional portal vein perfusion​ (e.g., with chemotherapeutic or embolic agents) can be administered through this catheter. This technique enables a "first strike" against potential intrahepatic micrometastases while resecting the primary tumor, embodying a refined integration of multimodal oncology therapy within minimally invasive surgery.

3. Hepatic Vein Occlusion Balloon Catheter: The "Invisible Hand" for Hemorrhage Control

Uncontrolled bleeding from the left hepatic vein is a major intraoperative concern. After initial extrahepatic mobilization of the vein, an expandable balloon catheter​ can be placed via femoral vein access under fluoroscopic or intravascular ultrasound guidance, positioning it at the junction of the left hepatic vein and the inferior vena cava. During parenchymal transection near the vein's root, temporary balloon inflation blocks venous outflow. Should a venous tear occur, this occlusion immediately creates a bloodless field for controlled suture repair, dramatically reducing the need for conversion to laparotomy.

II. Surgical Workflow Demonstration: Integrated Catheter Application for Hepatic Adenoma with Biliary Involvement

Preoperative:​ MRCP defines biliary anatomy; an ENBD tube is placed.

Intraoperative:

Port Placement:​ Standard 5-port layout, plus a 3mm accessory port in the right subcostal region for catheter manipulation.

Biliary Mapping:​ Fluorescein injection via the ENBD tube outlines the left hepatic duct and branches under fluorescence imaging, the tumor-duct relationship.

Portal Vein Access:​ The left portal vein branch is cannulated via a superior mesenteric vein tributary.

Hepatic Vein Preparation:​ An interventional team concurrently places a controllable balloon catheter at the predetermined left hepatic vein occlusion site via femoral access.

Resection Phase:

Routine mobilization and parenchymal transection proceed.

Before dividing the left hepatic pedicle, a small amount of methylene blue is injected via the portal vein catheter to confirm the target territory.

After pedicle division, regional perfusion is performed through the same catheter.

Prior to left hepatic vein transection, the interventional team inflates the balloon for temporary occlusion. The vein is then divided with an endoscopic stapler, after which the balloon is deflated.

Postoperative:​ The ENBD tube remains for 5-7 days and is removed after a cholangiogram confirms no bile leak.

III. Technical Advantages and Future Perspectives

The integrated use of catheter systems elevates laparoscopic liver resection from the era of "anatomical resection" to that of "functional intervention." Its core value lies in:

Visualization:​ Making the invisible (biliary and vascular trees) visible in real-time during surgery.

Controllability:​ Enabling proactive management of critical structures, shifting from reactive to predictive control.

Therapeutic Extension:​ Seamlessly bridging local adjuvant therapy with surgical excision.

Future Outlook:

Integration of magnetic navigation catheters, micro-intravascular ultrasound, and laparoscopic systems promises real-time 3D navigation and precise intravascular intervention. This will further dissolve the boundaries between surgery and interventional radiology, propelling hepatobiliary surgery toward an era of super-minimally invasive and precisely integrated therapy.