与呼吸机同步的NO吸入装置的研制

介绍一种和呼吸机同步的一氧化氮吸入装置,它使用气体流量计(GFM)检测呼吸机的吸气流量,通过气体稀释公式计算出在治疗条件下NO标气的流量,并由质量流量控制器(MFC)控制NO标气送入呼吸回路,采用NO／NO2电化学传感器对进入人体前的治疗气中NO和二氧化氮(NO2)的浓度进行监测。试验结果表明,该装置能和呼吸机同步供气,NO气体的用量相对于持续供气时节约了E／(I E)(吸呼比:I:E):NO2的生成量≤0.7×10-6．不仅实现了监测与配气的智能化,而且提高了NO治疗气浓度的准确性,确保了治疗的可靠性与安全性。

Development of a Nitric Oxide Inhaling Equipment Cooperated with the Ventilator Synchronously

A nitric oxide inhaling equipment cooperated with the ventilator synchronously, is introduced in this paper. This equipment monitors the inspiratory flow of the ventilator by a gas flow meter, and works out the flow value of NO on the therapeutic condition using the formula of gas dilution. Then its mass flow controller controls the flow of NO and delivers it to the respiratory circuit. At the same time, the concentrations of NO and NO2 are detected by the electrochemical NO/NO2 sensors before the therapeutic gas enters into the patient. The experimental result shows that this equipment can work with the ventilator in-phase periodically, the volume of E/(I+E) NO be saved, and the output of NO2 < or = 0.7 x 10(-6). Thus the equipment not only has realized the intellectual monitoring and gas-dispensing, but also has improved the precision of inhaled NO concentration with a better reliability and security during the therapy.