An Experimental Study of Partial Nephrectomy with Application of Microwave Tissue Coagulator (M.T.C.) to Mongrel Dogs

Han, Ki Young; Kitagawa, Ryuichi

Abstract

The Microwave Tissue Coagulator (M.T.C.) is one of the most sophisticated systems that have been developed and contributing to the modern medical treatments and practices. It is equipped with a magnetron specially developed and designated for medical purpose and with help of this oscillation device, produces microwave electricity of fine and high quality in frequency of 2,450 MHz with 12 cm of each wave in length. The power output can be adjusted upto the maximum of 100 watts. The microwave current, once generated by the magnetron is delivered tn a monopolar electrode through coaxial cable, and then proceeded to the electrode is picked into under living organic tissue and switched on to emit microwave current, the organic substances in the living organic tissue are attracted to the electromagnetic force and inclined to make a congestion in and around the field of force near the electrode tip. In the meantime, reacting to the extremely high frequency of energy shifting of 2,450 x 10(6) times in a second within itself the electrically loaded tip starts to be heated up, and this heat, in turn, acts upon organic tissues and effects their coagulation. It is known that this M.T.C. application has been practiced for a quite some time these days in the operation for the diseases of liver and spleen in surgical part, and also in the management of gastrointestinal bleeding in medical part. For further advent in the line, I had intended to try M.T.C. on partial nephrectomy with an aim of developing an effective new way of revivifying treatment of renal disease. As a mean of basic and preliminary, study for this project, an adult mongrel dogs had been experiment. The renal tissue of dogs had been applied with M.T.C. and made it to be in coagulated condition, and then the partial nephrectomy was performed. The objects had been closely examined histologically and the healing processes carefully checked through periodic autopsy of the dogs. The result of the experiment had been rather encouraging in that no significant unfavorable granulomatous changes such as proliferation of capillaries, fibrosis, etc. could be traced in the object, and in that the affected tissues were obsessed to have proceeded a smooth and gradual contraction process to recover their normal conditions. As conclusion, it is able to state that the application of M.T.C. on partical nephrectomy affects organic tissues only to a negligible degree, and further pursuance in my attempt could be very succesful one.