Summary
International Symposium on Antennas and Propagation
2012
Session Number:POS1
Session:
Number:POS1-61
Development of the Coagulation Device by Microwave Energy for Biological Tissue.
Mizuki Inoue, Kazuyuki Saito, Masaharu Takahashi, Koichi Ito,
pp.-
Publication Date:2012/10/29
Online ISSN:2188-5079
Summary:
In recent years, various types of medical applications of electromagnetic waves have widely been investigated and reported. One of them is minimally invasive thermal therapies using microwave. They are microwave coagulation therapy and interstitial microwave hyperthermia for medical treatment of cancer, cardiac catheter ablation for ventricular arrhythmia treatment, and thermal treatment of benign prostatic hypertrophy, etc. Thus we propose the microwave coagulation device for biological tissue that can use various surgeries such as an abdominal operation, a laparoscopic surgery, an underwater surgery, etc. Figure 1 shows a shape of using the device for liver surface. Once the surface is coagulated, it doesn't get bleeding in cutting. Therefore, this device can stop bleeding as show in figure 2. In this study, we estimated heating characteristics around the antenna by conducting both numerical simulations by using the FDTD method and animal experiment. Because massive bleeding during surgical operation is danger for the patient, hemostasis is one of the most important treatments. Especially, the laparoscopic surgery cannot be continued when the bleeding is severe because a view of the laparoscope reduces. Generally, the coagulation device for hemostasis is used ultrasonic waves or radio frequency waves. However there devices have some problems. For example, the view is hampered by splash when the ultrasonic wave device is used for a juicy tissue or in the blood. Also this device has possibilities that it heats other than an objective area. On the other hand, the radio frequency wave device threatens to heat excessively and a tissue is carbonised. Moreover, these devices are not able to use in the underwater surgery. Therefore, the coagulation device is required for reliable hemostasis with usability.