目的 设计呼吸机湿化罐自动补液装置，弥补传统滴注法的不足，并评价其在机械通气患者中的应用效果。方法 呼吸机湿化罐自动补液装置由非接触式电容传感器、控制器、固定器和电源等组成。装置采用常闭式电磁阀，通过电磁继电器与传感器连接并接收液位信号，控制输液器的开启和闭合。2024年7月—10月，便利选取泉州市某三级甲等医院重症医学科收治的机械通气患者60例，采用随机数字表法分为试验组和对照组各30例。试验组采用自动补液装置辅助添加湿化液，对照组采用输液器持续滴注法添加湿化液。评价两组湿化罐水位达标率、日均护理耗时、痰液黏稠度；收集护士的操作反馈。结果 试验组湿化罐水位达标率高于对照组，日均护理耗时低于对照组，差异有统计学意义（均P<0.05）；试验组痰液黏稠度优于对照组，但广义估计方程结果显示，两组患者不同时间点痰液黏稠度差异的组间效应、时间效应、交互效应均不具有统计学意义（P>0.05）。护士对装置的认可度为96.65%。结论 使用呼吸机湿化罐自动补液装置，实现了湿化液的自动补充，提高了湿化罐水位达标率；有利于减少护理耗时，可在一定程度上减轻护理工作负担；护士认可度高，具有较好的创新性与应用价值。试验组痰液黏稠度虽优于对照组，但差异无统计学意义（P>0.05），提示湿化效果可能受多因素影响，需进一步验证。

Objective To design an automatic refilling device for ventilator humidification chambers to address the limitations of traditional drip infusion methods，and evaluate its application effects in mechanically ventilated patients. Methods The automatic refilling device comprised a non-contact capacitive sensor，controller，stabilizer，and power supply. A normally closed solenoid valve，connected via an electromagnetic relay，received liquid-level signals from the sensor to regulate the opening/closing of the infusion set. From July to October 2024，60 mechanically ventilated patients in the intensive care unit of a tertiary class A hospital in Quanzhou were enrolled and randomly assigned to an experimental group（n=30，automatic refilling device） or control group（n=30，traditional continuous drip infusion）. Outcomes included humidification chamber water-level compliance rate，daily nursing time （minutes/day），sputum viscosity，and nurses’ operational feedback. Results The experimental group demonstrated a significantly higher water-level compliance rate（P<0.05） and reduced daily nursing time compared to the control group（P<0.05）. Although sputum viscosity in the experimental group was clinically better，Generalized Estimating Equations（GEE） analysis revealed no statistically significant intergroup，time，or interaction effects（P>0.05）. Nurses’ evaluations showed a 96.65% acceptance rate for the device. Conclusion The use of automatic refilling device has achieved automatic replenishment of humidification fluid and improved the compliance rate of humidification tank water level. It is beneficial for reducing nursing time and can alleviate the burden of nursing work to a certain extent. Nurses have high recognition，and the device demonstrates innovation and practical value in critical care settings. Although the viscosity of sputum in the experimental group was better than that in the control group，the difference was not statistically significant，indicating that the humidification effect may be influenced by multiple factors and further verification is needed.