A new device for 100 per cent humidification of inspired air

Crit Care. 2000;4(1):54-60. doi: 10.1186/cc651. Epub 2000 Jan 24.


STATEMENT OF FINDINGS: A new humidifier for use during mechanical ventilation in endotracheally intubated patients is described and tested. The humidifier is based on a heat-moisture exchanger, which absorbs the expired heat and moisture and releases it into the inspired air. External heat and water are then added at the patient side of the heat-moisture exchanger, so that the inspired gas should reach 100% humidity (44 mg/l) at 37 degrees C. In bench tests using constant and decelerating inspiratory flow and minute volumes of 3-25 l the device gave an absolute humidity of 41-44 mg/l, and it reduced the amount of water consumed in eight mechanically ventilated patients compared with a conventional active humidifier. During a 24-h test period there was no water condensation in the ventilator tubing with the new device.

Publication types

  • Comparative Study

MeSH terms

  • Critical Care / methods
  • Equipment Design
  • Female
  • Hot Temperature / therapeutic use*
  • Humans
  • Humidity*
  • Intubation, Intratracheal
  • Male
  • Models, Anatomic
  • Pulmonary Gas Exchange
  • Respiration, Artificial / instrumentation*
  • Respiration, Artificial / methods
  • Respiratory Physiological Phenomena
  • Sensitivity and Specificity
  • Treatment Outcome