不同阻塞器修复后上呼吸道气流特点比较

Comparison of flow pattern in airway rehabilitated with different obturators

目的利用CFD数值模拟的方法研究不同阻塞器修复后上呼吸道气流动力学特征,为阻塞器外形的临床设计提供理论依据。方法基于一例单侧上颌骨全切除术后患者的CT图像重建模拟阻塞器修复后上呼吸道,采用计算流体力学方法对气流流动进行数值模拟。结果获得患者高、中、低位的开放,闭合共6种阻塞器修复后吸气相和呼气相的气流流动趋势以及截面涡量云图,速度云图的比较。结论阻塞器修复未能改变缺损腔气流流动模式,闭合式阻塞器能填塞缺损腔,改变空腔的长深比,减少空腔涡区范围大小。中位闭合式在吸气和呼气相时均能显著减少涡区范围,是推荐的赝复体类型。

Objective To research the aerodynamics characteristic＇s of airflow in airway rehabilitated with different obturators using eomutational fluid dynamics （CFD） numerical simulation, to provide theoretical foundation for the optimal designation of obturators. Methods The obturators rehabilitating the upper airway was reconstructed based on the CT graphs of a patient after unilateral com- plete resection of maxilla and the airflow was numerically simulated using the method of CFD. Results After restoration with high open, high closed, medium open, medium closed,low open,low closed obturators respectively, the airflow trends in both inspiration and expiration phases and the velocity contours,vorticity contours were obtained; the comparison of velocity contours,vorticity contours and area for each cross-section between the healthy side and the affected side was made. Conclusions Rehabilitation of various obturators cannot change the flow pattern of airflow in the cavity, and closed type can fill the defective cavity,thus changing the length-depth ratio and reducing the low-velocity vortex volume. Medium closed type ones are recommended as they can reduce the vorticity volume sub- stantially during both the inspiration and expiration phases.