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为了研究呼吸机中双水平气道的建立方法,搭建了一个呼吸机气道内压力和流量采集系统,对呼吸时气道内压力和流量进行试验并记录试验数据.根据试验数据,运用Matlab统计分析了呼吸过程中气道内压力和流量的变化特征.数据分析表明:在呼气相,气道内的压力增加而流量减少;在吸气相,气道内的压力减少而流量增加;在呼吸暂停状态,气道内的压力和流量都保持稳定不变的状态.根据上述呼吸特征提出一种基于压力和流量双反馈的双水平气道建立方法.通过实验对双水平模型进行了验证.研究结果表明,所提出的方法对呼吸相的跟随具有很高的精度,对呼吸急促和呼吸暂停等呼吸事件有很强的适应性.
In order to study the establishment of bi-level airway in ventilator, an airway pressure and flow acquisition system was set up to test the pressure and flow in the airway during respiration and to record the experimental data.According to the experimental data, using Matlab statistical analysis Changes in airway pressure and flow during respiration were observed.Data analysis showed that in the expiratory phase, the pressure in the airway increased and the flow decreased, while in the inspiratory phase, the pressure in the airway decreased and the flow increased. In the state of apnea, The pressure and the flow in the channel are kept stable.The bi-level airway establishment method based on double feedback of pressure and flow is proposed based on the above respiration characteristics.The bi-level model is validated through experiments.The results show that the proposed two- Approach to follow the respiratory phase with high precision, rapid breathing and apnea and other respiratory events have a strong adaptability.