1. Humidification System
MR290 Autofeed
humidification chamber
High performance
breathing circuit
MR850 respiratory
humidifier

2. High Performance Breathing Circuit
Unique spiral heated wire
minimises condensate
improves humidity performance
Light weight
less drag on ETT
Integral MDI port
Slide 6- Dual Heated Circuit
Gas travelling from the chamber to the patient will lose heat to the room (ambient) and will cool. As it cools the humidity in the gas will condense in the tubing. This condensate is humidity that the patient does not receive.
Dual heated breathing circuits warm both the inspiratory and expiratory gas with a heated wire, as the gas travels along the circuit. This compensates for the heat loss to the room. In this manner a constant gas temperature is maintained and mobile condensation is minimised. The lack of condensate eliminates the need for a water trap thereby maintaining PEEP and reducing the risk of contamination.
The dual heated circuit is light weight which means less drag on the ET tube. There is a MDI port at the Y-piece for simple medication delivery.

3. Invasive Mode 37°C, 44mg/L + 3°C - 3°C 40°C, 44mg/L 37°C, 44mg/L
Slide 10- Invasive mode
In intubated mode the 850 system heats the cold, dry incoming gas from the ventilator to 37°C (approximately core temperature) and saturates the gas to around 44mg of water per litre. The humidifier displays the saturated gas temperature (normally around 37°C) which is the best indication of the level of humidification that the patient is receiving.
The gas is then heated a further 3°C by the heater wire as it travels up the inspiratory limb. This heating minimises condensate and overcomes the cooling that occurs in the circuit deadspace so that gases reach the patient close to core temperature and saturated.
37°C, 44mg/L

4. Non - Invasive Mode 34°C, 32mg/L + 3°C 31°C, 32mg/L
Slide 12 - Non-Invasive Mode In non-invasive mode the 850 system heats the cold, dry incoming gas to 31°C and saturates the gas to around 32mg of water vapour per litre. The gas is then heated a further 3 degrees by the heater wire as it travels along the inspiratory limb to minimise condensate and reach the patient at 34°C with 32 mg of water vapour per litre.
These settings prevent condensate from forming on the patient’s skin and approximates normal skin temperature. (A level which most people find comfortable)
31°C, 32mg/L

5. Condensate Control If less than 2°C Heating Chamber temperature
Slide 15 - Condensate Control
If the inspiratory heater wire cannot maintain 2°C of heating over 15 minutes in intubated mode, then the chamber set temperature is dropped by 0.5°C increments each 15 minutes to a minimum of 35.5°C to minimize condensate build up in the breathing circuit.
Chamber temperature
cools to minimum of 35.5°C

6. Temperature/flow probe
Slide 19 - Temperature/flow Probe
A Probe out alarm occurs if the temperature/flow probe is disconnected from the MR850 or broken. Power is removed from the heaters and remains off until the probe is reconnected or replaced. Pressing the Mute button silences the alarm for two minutes.
If the chamber temperature drops below 32°C in intubated mode or 28°C in mask mode with a measured gas flow of 40Lpm or there is a 1°C drop during the Warm-up period, a test is performed to verify if a Chamber probe out has occurred. This test can take up to 8 minutes and consists of 2 minutes of the heater plate power off, followed by up to 6 minutes of heater plate at full power whilst looking for a 2°C rise at the chamber probe. The MR850 alarms and enters Stand-by mode if it is unable to detect a 2°C rise. Pressing the Mute button resets the alarm.
If the airway temperature drops 1°C within 40 seconds during normal operation or there is a 1°C drop during the Warm-up period, a test is performed to verify if an Airway probe out has occurred. This test can take up to 5 minutes and consists of 2 minutes of heater wire off, followed by 3 minutes of heater wire at full power whilst looking for a 2°C rise at the airway probe. The MR850 alarms and enters Stand-by mode if it is unable to detect a 2°C rise. Pressing the Mute button resets the alarm.
A flow range sensor is paired with the chamber temperature sensor to measure gas flow. This sensor is heated 60oC above the chamber temperature and the gas flow calculated from the amount of heat lost as gases pass the probe. Flow measurement accuracy is intentionally low (+-50%) and readings are averaged over 60 seconds for the MR850 to recognise and respond to four flow states: No (0 lpm) - Stand-by Mode Lo (0 to 3 lpm) - heater plate limited to 20% power Int (2 to 17 lpm) - heater plate limited to 50% power Hi (13 lpm upward) - heater plate allowed to reach 100%

7. Humidification System
Easy to set-up
Simple to use
Minimal maintenance
Delivers optimal humidity
Delivering optimally humidified gases to critically ill patients maintains secretion quality, promotes gas exchange and decreases the risk of infection.
The MR850 Humidification System is:
Easy to Set-up
pre-packaged circuit and chamber
colour coded connectors that only fit one way
simple to follow set-up indicator
Simple to Operate
only three buttons: on/off, patient mode and alarm mute
Minimal Maintenance
closed delivery system with no need to refill chamber or empty water traps
trouble free nebulizer therapy and integral MDI port for aerosol administration
automatic stand-by during periods of no gas flow
Optimal Humidification
one button sets optimal humidity for intubated or mask patients
monitors gas temperature, flow and water level to optimize humidification and minimize condensate
auto-feed humidification chamber combined with unique spiral wound heater wire circuit evenly distributes heat, minimizes condensate and preserves optimal humidification delivery