计算机流体力学在模拟下鼻甲手术中的应用

Simulation of inferior turbinate reduction using computational fluid dynamics methods

目的:建立模拟两种下鼻甲切除术式的计算机流体力学即CFD模型,分析其对鼻腔流体力学的影响。方法:建立单侧下鼻甲肥大鼻腔的CFD模型A,在此基础上模拟下鼻甲切除术分别建立B、C两种术后模型,运用流体分析软件Fluent6.3.26计算三种模型的鼻腔全流场数据。结果:B模型患侧鼻腔面积较原始模型平均面积增大0.36cm2,C模型增大0.89cm2;B模型患侧鼻腔的压降差(约8Pa)与原始模型相比无太大改变,C模型压降差明显降低(约3Pa)。B模型患侧鼻腔流量无明显增加,C模型总鼻道下方及下鼻道流量为80ml/s,约为原始模型的8倍。B模型在吸气相及呼气相气流流速及流动方式与原始模型无明显改变,C模型在鼻瓣区流速明显增加,达到1.04m/s,并且涡流的产生与正常鼻腔趋于一致。结论:模型C在恢复鼻腔的正常解剖形态及正常通气生理方面都明显优于模型B。在下鼻甲手术中,恢复鼻腔的正常解剖结构对于鼻腔疾病的治疗具有决定性的意义。

Objective：Two computational fluid dynamic（CFD）models of unilateral inferior turbinate reductions（ITR）were constructed and investigate the influences of aerodynamic consequences.Method：A unilateral hypertrophic inferior turbinate CFD model wasestablished.Two kinds of methods in removing of tissue bulk along the length of the hypertrophic inferior turbinate were used,and we got the model B and the model C.Nasal airflow distribution were computed before and after simulated unilateral inferior turbinate reduction in use of Fluent6.3.26.Result：Simulated two kinds of ITR resulted in enlargement in the cross-section area of inferior nasal meatus,0.36cm^2 of the model B and 0.89cm^2 of the model C in average.Model C produced a less reduction in intranasal pressures（approximately 3Pa）than the model B and the original model which are the same as approximately 8Pa.More air was predicted to flow in the affected nasal passage in the model C（approximately 80ml/s）than the model B and the original model.Airspeed in the anterior valve region was improved significantly and more vortices happened in the model C.Conclusion：The model C is significantly better than the model B in restoring normal anatomy and ventilation physiological of the nasal cavity.So,in ITR recoverying normal anatomy structure of the nasal has decisive significance.