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Numerical model study of radio frequency vessel sealing thermodynamics

机译：射频容器密封热力学数值模型研究

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Several clinically successful clinical radio frequency vessel-sealing devices are currently available. The dominant thermodynamic principles at work involve tissue water vaporization processes. It is necessary to thermally denature vessel collagen, elastin and their adherent proteins to achieve a successful fusion. Collagens denature at middle temperatures, between about 60 and 90 C depending on heating time and rate. Elastin, and its adherent proteins, are more thermally robust, and require temperatures in excess of the boiling point of water at atmospheric pressure to thermally fuse. Rapid boiling at low apposition pressures leads to steam vacuole formation, brittle tissue remnants and frequently to substantial disruption in the vessel wall, particularly in high elastin-content arteries. High apposition pressures substantially increase the equilibrium boiling point of tissue water and are necessary to ensure a high probability of a successful seal. The FDM numerical models illustrate the beneficial effects of high apposition pressures.
机译：当前可获得几种临床上成功的临床射频血管密封装置。工作中主要的热力学原理涉及组织水汽化过程。必须热变性血管胶原蛋白，弹性蛋白及其粘附蛋白才能成功融合。胶原蛋白在大约60至90摄氏度的中等温度下变性，具体取决于加热时间和加热速率。弹性蛋白及其粘附蛋白具有更强的热稳定性，并且需要超过大气压下水的沸点的温度才能热融合。在较低的并置压力下快速煮沸会导致蒸汽液泡形成，组织脆性残留，并经常导致血管壁的实质性破坏，特别是在弹性蛋白含量高的动脉中。高并置压力实质上增加了组织水的平衡沸点，并且对于确保成功密封的高可能性是必要的。 FDM数值模型说明了高并置压力的有益效果。

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