The Science Journal of the American Association for Respiratory Care

2006 OPEN FORUM Abstracts

Performance of a Novel Humidification Device in Continuous Flow of Dry Gas

N.H. Tiffin, BSc, RRT, MSA1, D.H. Currie, PhD2, T.Q. Tuan, BS1, L.A. Weinstein, MS1, J.B. Taylor, BFA3 and C.H. Sellers, PhD4. 1Pari Respiratory Equipment, Midlothian, VA, United States; 2Sunrise Labs, Auburn, NH, United States; 3Farm Design, Hollis, NH, United States and 4Vapore, Almeda, Ca, United States.

Background: A novel active humidification system has been developed which can heat and humidify dry therapeutic gases.  This study measures the ability of this in-line humidification device (PARI HydratePari Respiratory Equipment, Midlothian , VA ) to heat and humidify dry therapeutic gas at high flows. The new technology (C-ForcePari Respiratory Equipment) produces water vapor in a pressurized stream from an in-line, small device placed proximal to the patient.  A controller allows precise water introduction into the bottom of a ceramic disk. A heating plate on the top of the disk vaporizes the water inside the ceramic and the resultant vapor stream is directed into the gas flow. Energy efficiency is over 90% and there are no moving parts in the disk.

Method: The device housing the vaporizing disk was connected to a flowmeter by 1/8  Dry oxygen source gas was used at flows of 10, 20 and 40 L/min. Temperature and relative humidity (RH) were recorded 6termperature at 20oC. RH was measured using a hygrometer calibrated as per manufacturer

Results:

Relative Humidity and Temperature of AirFlow
  RH (%) Temp (C)
source gas 3.0 20.0
10 L/min 95.9 35.9
20 L/min 90.7 36.6
40 L/min 95.0 36.0

Conclusions: This device is capable of heating and humidifying dry gas flows of up to at least 40 L/min to over 35oC and over 90% relative humidity. Application to high oxygen flow therapy is possible. 

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