Key Technology And System Development Of Multi-parameter Lung Function Detection

Chronic respiratory diseases have become the fourth leading cause of death worldwide.At present,the most economical,simple and effective screening method for autonomic breathers is pulmonary function testing,but due to the late start of pulmonary function testing in China and the lack of attention to chronic respiratory diseases,there is a large gap between the measurement parameters of independently developed pulmonary function screening devices in the domestic market,expensive,device performance and interaction design and foreign products.In addition,only large tertiary hospitals and some primary hospitals in China currently have lung function screening equipment,and the domestic market for major lung function instruments is basically monopolized by foreign equipment.The design of a high-performance,multi-parameter pulmonary function measurement system can both lay the foundation for the development of domestic pulmonary function meters and break the monopoly of foreign equipment on the domestic market.The ultimate goal of this paper is to design a multi-parameter pulmonary function measurement system,which consists of two parts: hardware system and software system.At the hardware level,the lung ventilation function and lung ventilation function are integrated through signal acquisition and filtering,combined with carbon dioxide and oxygen measurement modules,and the data collected by the hardware system is packaged and uploaded by the lower computer to the upper computer,and the upper computer acquires the data and uploads the The upper computer acquires the data and then unpacks the data uploaded from the lower computer and displays it on the PC display interface.In this paper,the most important respiratory flow parameter measurement,after the differential pressure flow measurement,turbine flow measurement,thermal flow measurement,ultrasonic flow measurement,electromagnetic flow measurement of the five common flow measurement methods,combined with the accumulation of laboratory and ease of use considerations are used the most ideal differential pressure flow measurement method.The system uses non-spectroscopic infrared sensor-based carbon dioxide measurement technology for carbon dioxide concentration measurement,paramagnetic method for oxygen concentration measurement,and laboratory-produced oxygen module for fingertip oxygen saturation measurement.At the software level,embedded technology is used to realize circuit driving,data acquisition,data processing,and data communication,and the upper computer display side realizes functions such as waveform display,parameter calculation,parameter display,and data storage.The system can realize integrated multiple parameters of lung function measurement,which can be combined with clinical diagnosis to screen lung function and respiratory tract diseases.All the vital signs signals involved in this paper have been tested strictly according to national standards and industry norms,and an integrated verification scheme for respiratory gas measurement has been designed.Through testing of hardware indicators,it was determined that the hardware system in this paper fully complies with national standards and meets the relevant technical indicators;through testing the accuracy of the measured parameters,it was shown that the accuracy of carbon dioxide,oxygen concentration and respiratory flow measurement are all within the within the range of national industry requirements.After repeated verification,the repeatability,stability and accuracy of this system meet the requirements of production and application,laying the foundation for the subsequent application of the engineering machine.