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目的:通过冷循环微波天线对离体猪肝凝固的实验研究,探讨不同时间,实际功率的变化规律及凝固区的形态及范围。方法:应用MTC-3型冷循环微波天线,分别以不同时间和实际功率组合热消融30只新鲜离体猪肝,观察不同目的功率热消融前后实际功率的变化规律,以及在此条件下造成的组织损毁的范围和形态。结果:加大输出目的功率会增大目的功率与消融后功率的偏离,而消融后功率偏离随着凝固时间延长变化没有统计学意义。在加大输出目的功率的同时延长凝固时间,凝固范围显著增大,但以目的功率60～70W,凝固时间为15min时凝固区形态更接近球形。结论:微波的输出实际功率稳定及适度凝固时间是确保凝固范围前提,随着目的功率的增加,功率衰减也进一步增大。其中目的功率为60～70W,凝固时间为15min时所形成的凝固范围更趋向球形,此对肝癌热消融治疗取得稳定的效果会有较大指导意义。
OBJECTIVE: To investigate the change law of the actual power and the morphology and range of the coagulation zone at different times through the experimental study on the frozen pig liver coagulation by the microwave antenna. Methods: Using MTC-3 cold cycle microwave antenna, 30 freshly isolated porcine livers were thermally ablated with different time and actual power respectively. The changes of actual power before and after thermal ablation were observed, and the results were obtained under these conditions The extent and form of tissue damage. Results: Increasing the output power will increase the deviation of the target power from the power after ablation. However, the power deviation after ablation has no statistical significance with the extension of the coagulation time. When the output power is increased, the solidification time is prolonged and the solidification range is significantly increased. However, when the target power is 60-70W and the solidification time is 15min, the shape of the solidification zone is more spherical. Conclusion: The actual output power of microwave is stable and the proper setting time is the premise of ensuring the solidification range. With the increase of the target power, the power attenuation is further increased. The purpose of the power of 60 ~ 70W, the coagulation time of 15min when the formation of the coagulation range more toward the sphere, this heat treatment of liver cancer achieved a stable effect will be of great guiding significance.