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目的:针对喉罩（laryngeal mask airway, LMA）在咽喉中置入后的气体泄露现象，使用交互式医学图像控制系统（materialise's interactive medical image control system, MIMICS）建立喉罩置入咽喉腔（pharyngolaryngeal cavity, PLC）中的3D模型（PLC-LMA模型），利用此模型研究LMA、PLC形态变化以及两者的间隙。方法:利用CT技术获取充满状态的LMA置入PLC的数据，同时获取离体LMA和正常颈部的数据，并将数据导入MIMICS。利用该软件建立LMA模型、PLC模型、PLC-LMA模型。结果:将PLC模型、PLC-LMA模型进行对照后发现：在LMA置入后，舌骨和甲状软骨的形状和位置发生了变化，PLC变化较大。插入LMA后，梨状窝、咽后壁缝隙、LMA气囊口咽端的凹陷处是潜在的气体泄漏通道，机械通气引起的气体泄漏可能从这里进入口咽和鼻咽。结论:计算机辅助三维模型能清晰显示PLC插入LMA前后两者的形变和位移，有助于进一步研究如何选择LMA型号和改进LMA的方法。“,”Objective:To establish a three-dimensional (3D) model based on Materialise's interactive medical image control systems (MIMICS) for the air leakage of laryngeal mask airway (LMA) during insertion into the pharyngolaryngeal cavity (PLC), and to investigate the morphological changes of LMA and PLC and the gap between them.Methods:CT scanning was used to obtain the data of PLC with full filled LMA (PLC-LMA). Meanwhile, the data of LMA and the normal neck were obtained and then imported into MIMICS to establish a LMA model, a PLC model and a PLC-LMA model.Results:We compared the PLC model with the PLC-LMA model and found that after LMA insertion, there were changes in shape and position of the hyoid bone and thyroid cartilage as well as the PLC. After LMA insertion, the gap among the pyriform sinus, posterior pharyngeal wall and LMA pharyngeal mask mouth-pharynx end were potential gas leakage tunnels, which might be the places that the gas leaked by mechanical ventilation flowed out before entery into the oropharynx and nasopharynx.Conclusions:The computer-aided 3D modeling can clearly visualize the displacement and deformation of LMA and PLC before and after insertion of PLC into LMA, which provides further reference for selection of an appropriate size of LMA and improve LMA design.