Ultrasonic Dissector

The ultrasonic dissector does not possess hemostatic properties, but serves only to remove or divide parenchyma, exposing vascular structures and bile ducts. These structures can be then controlled with conventional technique (ligation, clipping, coagulation) or by the use of the harmonic scalpel. The ultrasonic vibration (range about 100 |i) of the hand piece hollow titanium tip selectively destroys liver parenchyma cells because of their high water content. It preserves the vascular and bile duct structures due to their higher content of elastin and collagen. The tip of the hand piece is constantly irrigated. A suction line parallel to the hollow tip aspirates the irrigation fluid, blood, and small tissue fragments. The ultrasonic dissector allows a decrease in blood loss and provides extensive exposure and dissection of large anatomical structures like portal and hepatic venous branches [22, 23]. Preservation of these structures is necessary when the resected portion of the liver will be used as a graft for the recipient.

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