多功能呼吸参数测试系统设计

目的：介绍用于平静呼吸，用力呼气，被动呼吸状态下的各种呼吸指标测试系统的设计。方法：硬件系统由leisch流量换能器，压力换能器，放大器、A／D转换器和486微机组，软件系统由汇编语言对流量信号进行采样，C语言计算各种状态下的呼吸指标形成。结果：该系统能测试平静呼吸肺通气功能指标，RR、TF、PTEF、TiTot、TPF、FPF、PF25、ME／MI；用力呼气指标：FFV、PET、FEF1、MMF、FEF50、FEF75、MT、MTTp，用力呼吸流量－容量曲线；被动呼吸指标，Vrs,Rrs,Trs，被动呼吸气流量－容量环。结论：本系统具有低阻抗，高精度并集平静呼吸，被动呼吸，用于呼气三种肺功能测于一体的特点，可让医生根据病人不同的病情分为不同的部分进行选择，达到一机多用的目的，并使得肺功能指标测试方法更科学，临床意义更广泛，更易于推广。

The design of a system for measuring the respiratory indices

Objective:To introduce the design of a system that can measure the respiratory indices under tidal breathing,forced respiratory and passive respiratory.Methods:This is made up of Fleisch flow transducer,a pressure transducer and a 486 computer.Results:This system can measure indices:RR,TF,PTEF,TiTot,TPF,FPF,PE25,ME/MI,FFV,PET,FEF1,MMF,FEF50,FEF75,MTT,MTTp,Vrs,Rrs,Trs,tidal breathing flow volume loop and passive respiratory flow volume loop.Conclusion:This system have the advantages of small resistance,high precision,easy operation and measuring capability of different indices under tidal breathing,forced respiratory and passive respiratory.