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Figure 1 | Critical Care

Figure 1

From: A new device for 100 per cent humidification of inspired air

Figure 1

The Humid-Heat device is based on a heat-moisture exchanger (HME),which (a) absorbs the expired heat and moisture and releases it into theinspired gas. External heat (b) and water (c) are then added on the patientside of the HME so that the inspired gas (d) reaches about 100% relativehumidity at 37°C. The patient's minute volume is entered into themicroprocessor (e) by the operator. The microprocessor uses this informationand the actual airway temperature measured by a temperature probe (g) tocontrol a water pump (f) and a heater (b) to deliver the correct amount ofwater and heat. The arrows indicate the direction of the inspiratory and theexpiratory flow.

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