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A Novel Parameter for Predicting Arterial Fusion and Cutting in Finite Element Models

机译:有限元模型中预测动脉融合和切割的新参数

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Current efforts to evaluate the performance of laparoscopic arterial fusion devices are limited to costly, time consuming, empirical studies. Thus, a finite element (FE) model, with the ability to predict device performance would improve device design and reduce development time and costs. This study introduces a model of the heat transfer through an artery during electrosurgical procedures that accounts for changes in thermal material properties due to water loss and temperature. Experiments then were conducted by applying a known heat and pressure to carefully sectioned pieces of porcine splenic arteries and measuring cut completeness. From this data, equations were developed to predict at which temperature and pressure arterial tissue is cut. These results were then incorporated into a fully coupled thermomechanical FE model with the ability to predict whole artery cutting. An additional experiment, performed to examine the accuracy of the model, showed that the model predicted complete artery cut results correctly in 28 of 32 tests. The predictive ability of this FE model opens a gateway to more advanced electrosurgical fusion devices and modeling techniques of electrosurgical procedures by allowing for faster, cheaper and more comprehensive device design.
机译:当前评估腹腔镜动脉融合装置性能的努力仅限于昂贵,耗时的经验研究。因此,具有预测设备性能的能力的有限元(FE)模型将改善设备设计并减少开发时间和成本。这项研究介绍了电外科手术过程中通过动脉的热传递模型,该模型说明了由于失水和温度导致的热材料性能变化。然后,通过将已知的热量和压力施加到猪脾动脉的细小切片上并测量切开的完整性来进行实验。根据这些数据,开发了方程式以预测在哪个温度和压力下切除动脉组织。然后将这些结果合并到具有预测整个动脉切割能力的完全耦合的热机械有限元模型中。为了检查模型的准确性而进行的另一项实验表明,该模型在32个测试中的28个中正确预测了完整的动脉切割结果。该FE模型的预测能力通过允许更快,更便宜和更全面的设备设计,为通往更先进的电外科融合设备和电外科手术建模技术打开了大门。

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