Fisher MR850 User manual
Technical Documentation
Fisher & Paykel® MR 850
Respiratory Humidifier
Revision 5.0
5697.500
9036209
Because you care
Contents
General
1 Symbols and Definitions 3
2 Notes 3
Function Description
1 MR 850 Respiratory Humidifier 7
1.1 Humidifier Operation .............................................................................................................. 7
1.2 Operating Modes .................................................................................................................... 8
1.2.1 Stand-by mode ......................................................................................................... 8
1.2.2 Intubated mode ........................................................................................................ 8
1.2.3 Mask mode ............................................................................................................... 8
1.3 Controls .................................................................................................................................. 9
1.3.1 On/off button ............................................................................................................. 9
1.3.2 Mode button ............................................................................................................. 9
1.3.3 Mute button .............................................................................................................. 9
1.4 Optical Indicators .................................................................................................................. 10
1.4.1 Display .................................................................................................................... 10
1.4.2 Humidity alarm (lung symbol) ................................................................................. 10
1.4.3 Warning triangle alarm ........................................................................................... 10
1.5 Setup Indicators (LEDs) ....................................................................................................... 10
1.5.1 Temperature probes ............................................................................................... 10
1.5.2 Heater wire adapter ................................................................................................ 10
K5697500IECIVZ.fm 10.05.06
1.5.3 Temperature probe connectors .............................................................................. 11
1.5.4 Humidification chamber temperature probe alarm with probe connector alarm ..... 11
1.5.5 Airway temperature probe alarm with probe connector alarm ................................ 11
1.5.6 Water out LED ........................................................................................................ 11
1.6 Operational Alarms ............................................................................................................... 11
1.6.1 Humidity alarm (lung symbol) ................................................................................. 11
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I
Contents
Annex
Parts catalog
Test List
K5697500IECIVZ.fm 10.05.06
All rights reserved. Copyright reserved.
II
General
1
2
Fisher & Paykel MR 850 General
1 Symbols and Defini-
tions
WARNING
A WARNING statement provides important information about a potentially hazardous situation which, if not avoided, could result in death
or serious injury.
CAUTION
A CAUTION statement provides important information about a potentially
hazardous situation which, if not avoided, may result in minor or moderate
injury to the user or patient or in damage to the equipment or other property.
NOTE
A NOTE provides additional information intended to avoid inconvenience
during operation.
Definitions according to German standard DIN 31051:
Inspection = examination of actual condition
Maintenance = measures to maintain specified condition
Repair = measures to restore specified condition
Servicing = inspection, maintenance, and repair
2Notes
This Technical Documentation conforms to the IEC 60601-1 standard.
Read each step in every procedure thoroughly before beginning any test.
Always use the proper tools and specified test equipment. If you deviate from
the instructions and/or recommendations in this Technical Documentation,
the equipment may operate improperly or unsafely, or the equipment could be
damaged.
It is our recommendation to use only Dräger parts and supplies.
The maintenance procedures described in this Technical Documentation may
be performed by qualified service personnel only. These maintenance procedures do not replace inspections and servicing by the manufacturer.
The information in this Technical Documentation is confidential and may not
be disclosed to third parties without the prior written consent of the manufacturer.
This Technical Documentation is for the purpose of information only. Product
descriptions found in this Technical Documentation are in no way a substitute
for reading and studying the Instructions for Use/Operating Manual enclosed
with the product at the time of delivery.
All rights reserved. Copyright reserved.
Version 3.0_ Released_Printed on_10.05.06_General_Technical_Documentation.fm
5697.500
3
General Fisher & Paykel MR 850
Know-how contained in this Technical Documentation is subject to ongoing
change through research and development and Dräger Medical reserves the
right to make changes to this Technical Documentation without notice.
NOTE
Unless otherwise stated, reference is made to laws, regulations or standards (as amended) applicable in the Federal Republic of Germany for
equipment used or serviced in Germany. Users or technicians in all other
countries must verify compliance with local laws or applicable international
standards.
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4
5697.500
Function Description
5
6
Fisher & Paykel MR 850 Function Description
1 MR 850 Respiratory
Humidifier
The MR 850 Respiratory humidifier is designed to add heat and moisture to
the respiratory gas delivered to the patient. The humidifier can be connected
to various ventilators. It supports CPAP ventilation, delivery of other medical
gases, intubation and mask ventilation.
Figure 1 MR 850 Respiratory Humidifier
1.1 Humidifier Operation The respiratory gas flows into the humidification chamber. A heater plate
heats the sterile, pyrogen-free water contained in the humidification chamber.
The heater plate is located below the humidification chamber. The heated
water humidifies the respiratory gas. A temperature probe at the humidification chamber outlet measures the respiratory gas temperature. The measurement signal is transmitted to a control circuitry. This control circuitry controls
the amount of power delivered to the heater plate in order to maintain the respiratory gas temperature at a constant level.
The heated and humidified respiratory gas travels through the inspiratory
limb. The inspiratory limb has a heater wire inside. A temperature probe measures the patient’s respiratory gas temperature. The opening of this temperature probe is located at the end of the inspiratory limb near the patient. The
measurement signal from the temperature probe is transmitted to a control
circuitry. This control circuitry controls the power delivered to the heater wire
in order to maintain the respiratory gas temperature at the inlet and outlet of
the inspiratory limb at a constant level. This prevents the humidity contained
in the respiratory gas from condensing in the inspiratory limb.
An expiratory limb heater wire must also be used in order to stop the patient’s
expired humidity from condensing into the expiratory limb of the breathing circuit.
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Function Description Fisher & Paykel MR 850
1.2 Operating Modes
1.2.1 Stand-by mode Depending on the severity of the alarm condition, the humidifier will either
enter stand-by mode or remove all power from the heating systems (heater
plate, heater wire(s)).
The humidifier will generate an audible alarm and always enter stand-by
mode if the following occurs:
– Malfunction/error during operation
– Incorrect settings
– Gas flow in breathing circuit stops
In stand-by mode the following occurs:
– Heater wire power is set to 30 %
– Heater plate temperature is limited to 60 °C
– Heater plate power is limited to 20 %
1.2.2 Intubated mode ”Intubated” is the default mode on power on of the humidifier. This mode is for
use with patients who need to be ventilated mechanically. The humidifier
delivers an optimally humidified respiratory gas of 44 mg/L to the patient. The
respiratory gas temperature is almost the same as the patient’s core temperature (37 °C).
If ambient conditions change, e.g. due to cold or drafts, the temperature can
be reduced in steps to 35 °C in order to prevent condensate buildup in the
inspiratory limb.
1.2.3 Mask mode ”Mask” mode is suitable for patients who are receiving gas via a face mask
(O2 therapy, CPAP). In this mode the patients receive respiratory gas that
has an adequate humidity level (to compensate for the unphysiologically high
gas flow rate).
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5697.500
Fisher & Paykel MR 850 Function Description
1.3 Controls
1.3.1 On/off button If the on/off button is held down briefly, the humidifier will toggle on or off.
After power-on the humidifier starts an internal diagnostic routine (self test).
An audible signals tells the user when the self test is completed.
1.3.2 Mode button When held down for one second, the mode button toggles the humidifier
between mask mode and intubated mode.
1.3.3 Mute button The mute button silences the humidifier’s audible alarm. The muted time
depends on the alarm condition and the type of alarm.
Both the chamber temperature and then the airway temperature can be displayed by pushing and holding the mute button for 1 second. The display will
return to airway temperature after a few seconds.
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Function Description Fisher & Paykel MR 850
1.4 Optical Indicators
1.4.1 Display The display shows the saturation temperature of the delivered respiratory gas
in °C. Normally, it is the temperature of the humidification chamber (in intubated mode approx. 37 °C, in mask mode approx. 30 °C)
1.4.2 Humidity alarm (lung
symbol)
1.4.3 Warning triangle alarm The warning triangle indicates a serious hardware fault.
1.5 Setup Indicators
(LEDs)
1.5.1 Temperature probes These LEDs will light if the temperature probes (humidification chamber, air-
The humidifier will generate an audible and visual alarm if the temperature in
the humidification chamber is above 41 °C or the respiratory gas temperature
is above 43 °C.
The humidifier generates a visual and audible alarm if in intubated mode a
low level of humidity is being delivered to the patient for too long.
The humidity alarm may be caused by ambient conditions (cold, drafts) or
can result from too high or too low gas flow rates.
WARNING
If the warning triangle on the MR 850 Respiratory Humidifier comes
on, immediately take the humidification chamber and the breathing
circuit out of service.
The setup indicators (LEDs), placed on the lower left of the front panel, light
when the humidifier and its accessories are not set up correctly.
way) are not correctly plugged into the breathing circuit or the humidifier.
After power-on or fast changing of temperature values, the humidifier checks
whether the temperature probes are plugged in or not by first cooling down
then heating up the respiratory gas.
If the humidifier finds that either probe is not inserted into the breathing circuit, an alarm will be generated and the humidifier will enter stand-by mode.
During this alarm the humidifier will initiate a probe out test periodically, or a
test will be initiated immediately after mute has been pressed.
During periods of low or zero gas flow, the airway probe out alarm is disabled.
As soon as flow is detected however, an airway probe test is initiated.
1.5.2 Heater wire adapter The heater wired adapter indicator will light under the following conditions:
– Heater wire adapter not connected correctly
– Breathing circuit is faulty or not connected correctly
– There is an intermittent connection
– Excessive current in the heater wires (total current in all limbs greater
than 3.5 A)
The humidifier will remove power from the heating system if the heater wire
adapter alarm is active.
10
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For internal use only. Copyright reserved.
Fisher & Paykel MR 850 Function Description
1.5.3 Temperature probe connectors
1.5.4 Humidification chamber
temperature probe alarm
with probe connector
alarm
1.5.5 Airway temperature
probe alarm with probe
connector alarm
The temperature probe LEDs will light under the following conditions:
– Temperature probes are not connected correctly to the humidifier
– Temperature probes are faulty
The humidifier checks whether the temperature probes are open or short circuited.
The humidifier checks to see if the humidification chamber temperature probe
is faulty by testing for the following conditions:
– Humidification chamber temperature is greater than 80 °C.
– Humidification chamber temperature has been greater than 50 °C for 20
minutes.
If an apparent fault is found, the humidifier will give a probe connector alarm
and the LED of the humidification chamber temperature probe will light. The
humidifier will stay in stand-by mode until the temperature at the humidification chamber temperature probe drops below 50 °C.
The humidifier checks to see if the airway temperature probe is faulty by testing for the following conditions:
– Airway temperature is greater than 80 °C.
– Airway temperature has been greater than 50 °C for 5 minutes.
If an apparent fault is found, the humidifier will give a probe connector alarm
and the LED of the airway temperature probe will light. The humidifier will
stay in stand-by mode until the temperature at the airway temperature probe
drops below 50 °C.
1.5.6 Water out LED The water out LED indicates that there is insufficient water in the humidifica-
tion chamber.
The humidifier controls the amount of power required to maintain the set
chamber temperature at a constant level.
If a lower than expected amount of power is required, the humidifier will generate a visual and audible water out alarm.
With greater changes in flow it may take 15 minutes or longer to generate a
water out alarm.
The water out alarm can be cancelled for 1 minute by pressing the mute button. If however the water out condition remains, the humidifier will re-alarm.
1.6 Operational Alarms These alarms are generated if problems occur with the operation of the
humidifier.
1.6.1 Humidity alarm (lung
symbol)
A humidity alarm will occur if the displayed temperature is too high, or if the
delivered humidity (intubated mode only) has been low for a period of time.
The humidifier will generate a visual and audible alarm if the humidification
chamber temperature exceeds 41 °C or the airway chamber exceeds 43 °C.
If these high temperature alarms occur, the humidifier will immediately shut
down the heater wire and the heater plate.
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Function Description Fisher & Paykel MR 850
Low humidity warning and alarm
The low humidity warning and alarm are disabled during warm-up and no flow
conditions.
The lung symbol lights when a low level of humidity is being delivered to the
patient. The audible alarm alerts the user that a low level of humidity has
been delivered to the patient for too long.
The humidification chamber temperature probe controls the humidity low
warning or alarm.
If the humidification chamber temperature is below 35.5 °C for 25 seconds,
the lung symbol will light. If the temperature remains below this level for too
long, then a low humidity alarm is activated.
The time taken for the humidifier to alarm is dependent on how far below the
35.5 °C threshold the temperature is.
The following Figure shows the relationship between temperature and the
time before a warning or alarm is generated:
12
Figure 2 Temperature vs time to alarm
Pressing the mute button silences the audible low humidity alarm for 1 minute
if the same temperature of the humidification chamber temperature probe is
maintained.
The low humidity warning and alarm can occur under the following conditions:
–Cold
– Drafts
– Gas flow rates outside specification of breathing circuit
– Gas flow rates outside specification of humidification chamber
– Gas flow rates outside specification of humidifier.
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Annex
Parts catalog
Test List
Parts catalog
Fisher&Paykel MR 850
Emergency Care - Perioperative Care - Critical Care - Perinatal Care - Home Care
Revision: 2006-03-20 08:50:13
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Temp.Sensoradapter
Parts catalog
Item
Part No. Description Qty.
No.
8411044 PROBE-THERMOMETER HOUSING DRAE 1.000 St
Qty.
unit
Remark
5697.500
Items that are shown in the illustration but are not listed below the illustration are not available as spare parts
Revision: 2006-03-20 08:50:13
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