Department of Biomedical Engineering, TheUniversity of Michigan, Ann Arbor, MI 48109, USA.
IEEE Trans Biomed Eng. 2012 Jan;59(1):167-73. doi: 10.1109/TBME.2011.2168956. Epub 2011 Sep 23.
In this study, a novel thermal management system (TMS) is developed for the minimization of thermal spread created by a monopolar electrosurgical device, the most commonly used surgical instrument. The phenomenon of resistive heating of tissue is modeled using the finite-element method (FEM) to analyze the electrical potential and temperature distributions in biological tissue subjected to heat generation during monopolar electrosurgery. Ex vivo experiments are used to validate the FEM by comparing the model predicted and experimentally measured temperatures. The predicted FEM maximum temperature 1.0 m adjacent to the electrode is within 1% of the experimentally measured maximum temperature using a standard monopolar pencil electrode. A TMS consisting of adjacent cooling channels produces coagulation volumes 80% that of standard monopolar procedures while maintaining comparable temperatures in the targeted tissue below the electrode. In vivo temperatures using a device incorporating a TMS at distances of 2 and 3 m adjacent to the electrode edge are maintained below temperatures known to damage tissue.
在这项研究中，开发了一种新颖的热管理系统 (TMS)，用于最小化由最常用的手术器械单极电外科器械产生的热扩散。使用有限元方法 (FEM) 对组织的电阻加热现象进行建模，以分析在单极电外科手术中产生热量时生物组织中的电势能和温度分布。通过将模型预测的温度与实验测量的温度进行比较，使用离体实验来验证 FEM。使用标准的单极铅笔电极，预测的 FEM 最大温度 1.0 m 紧邻电极的温度在 1%以内。由相邻冷却通道组成的 TMS 在产生与标准单极手术相当的温度的同时，将凝血体积缩小到标准单极手术的 80%。在距离电极边缘 2 和 3 m 处使用 TMS 的设备中的体内温度保持在已知会损伤组织的温度以下。
