Background/Purpose: The efficacies of vessel sealing system (VSS) devices for major Glisson bundles and major bile ducts have not yet been determined. Methods: Male pigs (n = 6) and a LigaSure V device and an Atlas 20 (Valleylab, Boulder, CO, USA) device were used in this study. After laparotomy, the common bile duct and the right and left first-degree Glisson bundles were sealed by the VSS. The lower and upper parts of the common bile ducts were also sealed. Macro-and microscopic examinations were performed for the analysis of specimens taken just after VSS application. In an analysis of bile duct specimens taken 1 week after the VSS application, both burst pressure tests and histological examinations were performed. Results: (1) In the analysis of the specimens (Glisson bundles and bile ducts) obtained just after the VSS application, the macroscopic changes included permanent, flattened changes of the Glisson bundles and bile ducts, without showing any blood or bile leakage. Histological examination of the transverse sections of the Glisson bundle after VSS application revealed that not only the blood vessels but also the bile ducts were fused together. (2) In the analysis of the specimens (bile ducts) obtained 1 week after the VSS application, second-look laparotomy showed extrahepatic bile duct obstruction. The mean burst pressure of the sealed bile ducts was 74.4 ± 20.1 mmHg. Histological examination revealed that the lumen of the bile duct was completely sealed and the duct was surrounded by dense connective tissues. Conclusions: The VSS is useful for the safe sealing of not only the major Glisson bundles but also the major bile ducts.
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