1994 Volume 12 Pages 13-19
The synchronous use of microwave irradiation (50-60 Watt) and dissociating electric current (20mA) was newly applied to the percutaneous microwave coagulation therapy. The color evaluation in the albumen of eggs revealed that the rnicrobubbles generated by synchronous dissociating electric current prevented the coagulated albumen from gluing on the needle-electrode. The fine needle-electrode which was 250mm in length and 1.6mm in diameter produced by Heiwa Electronic Co. Ltd. was used for the microwave coagulation of the tumors through the Tru-Cut biopsy needle under ultrasound guidance. This method was newly applied to 2 clinical cases. The case 1 was the 74 female, metastatic liver cancer patient, who had the history of colectomy and left lobectomy of the liver. The target was the solitary 2.5cm sized lesion located in the Couinaud's segment 6. The enhanced CT scan after the microwave coagulation therapy revealed that the lesion became 3 cm sized low density area which implied the lesion was successfully coagulated. The case 2 was the 63 male, recurrent hepatocellular carcinoma patient, who had the history of partial resection of the liver and transcatheter arterial embolization. The targets were multiple but they were less than 2cm in diameter. After the treatment, the tumor stains were disappeared on the dynamic CT scan. The outcome of these cases were 14 months and 12 months survival after the treatment, respectively. It is demonstrated that the liver tumor less than 3cm in diameter may become therapeutic indication of the percutaneous microwave coagulation therapy by the synchronous use of microwave irradiation and dissociating electric current.
