呼吸机湿化罐自动补液装置的设计及应用

doi:10.3761/j.issn.2096-7446.2026.01.020

Abstract

Abstract:

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.

Key words: Airway Management, Airway Humidification, Mechanical Ventilation, Intensive Care Units

LIU Haijin, WU Biyu, CHEN Lanlan, LIN Caixia, CHEN Yueting, HUANG Qiongqiong. Design and application of an automatic refilling device for ventilator humidification chambers[J]. Chinese Journal of Emergency and Critical Care Nursing, 2026, 7(1): 123-128.

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Design and application of an automatic refilling device for ventilator humidification chambers

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