Karaki Wafaa, Lopez Carlos A, Borca-Tasciuc Diana-Andra, De Suvranu
Center for Modeling, Simulation and Imaging in Medicine, Rensselaer Polytechnic Institute, Troy, NY 12180.
Center for Modeling, Simulation and Imaging in Medicine,Rensselaer Polytechnic Institute, Troy, NY 12180.
J Biomech Eng. 2019 May 1;141(5):0510031-05100314. doi: 10.1115/1.4042898.
Electrosurgical procedures are ubiquitously used in surgery. The commonly used power modes, including the coagulation and blend modes, utilize nonsinusoidal or modulated current waveforms. For the same power setting, the coagulation, blend, and pure cutting modes have different heating and thermal damage outcomes due to the frequency dependence of electrical conductivity of soft hydrated tissues. In this paper, we propose a multiphysics model of soft tissues to account for the effects of multifrequency electrosurgical power modes within the framework of a continuum thermomechanical model based on mixture theory. Electrical and frequency spectrum results from different power modes at low- and high-power settings are presented. Model predictions are compared with in vivo electrosurgical heating experiments on porcine liver tissue. The accuracy of the model in predicting experimentally observed temperature profiles is found to be overall greater when frequency-dependence is included. An Arrhenius type model indicates that more tissue damage is correlated with larger duty cycles in multifrequency modes.
电外科手术在外科手术中被广泛应用。常用的功率模式，包括凝固模式和混合模式，使用非正弦或调制电流波形。对于相同的功率设置，由于软湿组织电导率的频率依赖性，凝固模式、混合模式和纯切割模式具有不同的加热和热损伤结果。在本文中，我们基于混合理论，在连续体热机械模型框架内提出了一个软组织多物理模型，以考虑多频电外科功率模式的影响。给出了不同功率模式在低功率和高功率设置下的电学和频谱结果。将模型预测结果与猪肝组织的体内电外科加热实验进行了比较。当考虑频率依赖性时，发现该模型预测实验观察到的温度分布的准确性总体上更高。一个阿累尼乌斯型模型表明，在多频模式下，更大的占空比与更多的组织损伤相关。
