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REMSTAR® M SERIES HUMIDIFIERS (Respironics)
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Respironics Product Library 2010 |
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- Difference between Cool Pass-over & Heated Humidification - Cool pass-over style humidifiers allow the air flow to pass over a pool of water and subsequently pick up water vapor by free evaporation. Typically the larger the surface area of the pool of water the more water vapor the air stream can pick up. This is why Respironics' LX Humidifier and the new REMstar Pass-over Humidifier provide additional humidification capabilities vs. a non-heated canister-type water chamber with minimal surface area. The REMstar Heated Humidifier is also a pass-over style humidifier but it is heated. Heated pass-over style humidifiers are much more efficient at providing humidification simply by increasing the water temperature, which increases water vapor production vs. free humidification (see picture below). By increasing the water temperature, additional energy is added to the individual molecules, allowing more of them to transform from the liquid state. As a result, the heated humidifier has the capability to provide additional water vapor to the air stream vs. a typical cool pass-over design.
- Bacteria and the Chamber - Heated humidification produces molecular water vapor (.0001 microns in size) that is too small to transport bacteria into the air stream that is delivered to the patient. If small amounts of bacteria are present in the chamber there is little risk to the patient. Bacteria requires a carrier and molecular water vapor cannot provide this mechanism.
- Distilled water vs. tap water - Most tap water contains various minerals. When a pool of water is heated and evaporated, these minerals are left behind and may cause discoloration to the aluminum plate and plastic housing of the humidifier chamber. It may adversely affect the longevity of the chamber. Distilled water has been purified and will not generate mineral residue upon evaporation and may extend the usable life of the chamber.
- Dew Point - The temperature level where a fully saturated gas begins to condense. (This is often referred to as rain out in a patient circuit.)
- Temperature - The air temperature plays a key role when discussing humidification. At any given temperature air can hold a specific amount of water vapor. Basically the higher the temperature the more capacity the air has to hold water vapor.
- Relative Humidity - Relative humidity is the ratio of actual water vapor in the air compared to how much water vapor the air is capable of holding (its capacity). Relative humidity's unit of measure is %.
- Absolute Humidity - Absolute humidity is a measurement of actual water vapor content per volume of air, measured in milligrams of water vapor per liter of air {mg H20/L}.