Abstract：
The success rate of the electrosurgical high-frequency electric field welding technique lies in reasonable control of the welding time. However, the final impedance value used to control the welding time varies due to differences in tissue size and the welding method during the welding process. This study aims to introduce a new reference indicator not limited by impedance size from dynamic impedance to achieve an adequate weld strength with minimal thermal damage, providing feedback on the tissue welding effect in medical power supplies. End-to-end anastomosis experiments were conducted with porcine small intestine tissue under seven levels of compression pressure. The dynamic impedance changes were analyzed, combined with compression pressure, temperature, moisture, and collagen during welding. The welding process was divided into three stages according to the dynamic impedance, with impedance decreasing in Period Ⅰ and impedance increasing in Period Ⅲ. Period Ⅲ was the key to high-strength connections due to water evaporation and collagen reorganization. The dynamic impedance ratio is defined as the final impedance divided by the minimum impedance, and successful welding would be predicted when detecting the dynamic impedance ratio over 4 (n = 70, p < 0.001). Dynamic impedance monitoring can be used as a macroscopic real-time prediction of the anastomosis effect.
摘要：
电外科高频电场焊接技术的成功率在于合理控制焊接时间。然而,用于控制焊接时间的最终阻抗值由于焊接过程中组织尺寸和焊接方法的差异而变化。本研究旨在引入一种新的参考指标，不受动态阻抗阻抗大小的限制，以实现足够的焊接强度和最小的热损伤。提供有关医用电源中组织焊接效果的反馈。在七个水平的压缩压力下用猪小肠组织进行端到端吻合实验。分析了动态阻抗的变化,结合压缩压力，温度,水分,焊接过程中的胶原蛋白。焊接过程根据动态阻抗分为三个阶段,Ⅰ期阻抗降低，Ⅲ期阻抗增加。由于水分蒸发和胶原蛋白重组，Ⅲ期是高强度连接的关键。动态阻抗比定义为最终阻抗除以最小阻抗，当检测到动态阻抗比超过4（n=70，p<0.001）时，可以预测成功的焊接。动态阻抗监测可作为吻合效果的宏观实时预测。
