呼吸力学参数监测系统的设计与实现

目的：设计呼吸力学参数监测系统，实现流量、气道压力两个基本量和潮气量、分钟通气量、呼吸率、峰值压力、峰值流量、气道阻力等十八个推导参数的监测与显示。方法：利用流量传感器将呼吸气流引入到压力传感器，检测到病人气道的流量和压力，把实时采集的这两个信号发送到单片机系统通过预设的算法推导出相关呼吸力学参数，将这些参数发送到上位机或监护仪用于参数和波形的显示。结果：流量同标准流量计的相对误差是8．43％。气道压力同呼吸机测试仪的相对误差是2．5％，都在系统规格设定的范围以内。推导出的呼吸力学参数的最大误差都在允许的5％范围以内。结论：该系统设计方法新颖，监测参数准确，显示波形细腻平滑，满足临床呼吸力学参数监测的功能和应用需要，可以弥补国产监护仪的技术不足。

DESIGN AND REALIZATION OF A MEASUREMENT SYSTEM FOR RESPIRATORY MECHANICS PARAMETERS

Objective：To design a measurement system of respiratory mechanics parameters, for monitoring and displaying of flow, airway pressure, TV, MV, RR, PIP, PEP, PIF, PEF,and airway resistance. Method：Airflow was introduced by flow sensor to the pressure sensor, then the patient＇s flow and airway pressure were measured. These two real-time collected signals were sent to MCU system for deducing the respiratory mechanics parameters by the inner program. These parameters were transmitted to the monitor for the display of parameters and waveforms. Results：The relative error between the measured flow and standard flowmeter is 8.43%, and the relative error between the measured airway pressure and test meter of ventilator is 2.5%; both were with in the range set by the specification. The biggest errors of deduced parameters were in the range of 5% allowed by the specification. Conclusion：The system was original in design, and was effective to detect the parameters and display the waveform exquisitely and smoothly, which met the function and application need of measuring the respiratory mechanics in clinic and improved the technique performance of domestic monitor.