目的设计一种应用于功能性内窥镜鼻窦手术后的引流器,可以在上颌窦术后防止窦口的粘连,通过鼻腔呼吸气流将上颌窦内的积液引出,及将药物输送到窦口鼻道复合体处,方便术后的管理。方法根据重建的三维鼻腔模型进行数值模拟的结果和鼻阻力仪测量的结果得到窦口鼻道复合体处的气流流动情况,以此作为依据,设置合理的边界条件。通过两相流理论和建立的引流器计算模型,对于"引流和给药过程"进行数值模拟和定量分析。在数值模拟过程中,改变引流器的管径以及引流物质的黏性系数,分别计算并比较结果来优化引流器形状。结果计算了几种管径的引流器和同一管径引流器对不同黏性系数液体引流效果并进行了比较,得到一种比较合理的能够完成引流、给药和通气功能的引流器。结论设计的引流器可以完成通气、引流,给药和保持上颌窦口不粘连的功能。

Objective A drainage ware was designed for postoperative care after functional endoscopic sinus surgery. It can prevent the ostium of maxillary sinus from closing, drain the empyemata from maxillary sinus and send the medicament to the field of ostiomeatal complex. Methods Based on the results of numerical simulation of airflow in nasal cavity and the data obtained from Rhinomanometry, the characters of airflow in the middle nasal meatus were acquired. According to the characters, right boundary conditions for the following calculation were assigned. The numerical model of drainage ware was generated. Based on the tow-phase flow theory and finite-volume method, numerical simulation for the liquid in the drainage ware was performed to explain how the drainage ware did its work of draining the empyemata from maxillary sinus and sending the medicament to the place around the surface of wound. By changing the value of tube diameter or viscosity parameters of liquid-phase flow, different results of numerical simulation were acquired. Results After comparing the computational results, the fit value of drainage tube diameter was obtained. Conclusions Through numerical simulation for two-phase flow in the drainage ware it proved that the drainage ware designed in this way can accomplish the work of keeping ventilative, draining the empyemata, sending medicament and preventing the ostium of maxillary sinus from closing.

国家自然科学基金(10472025,10672036); 辽宁省自然科学基金(20032109)