O_TWO CAREvent ATV User manual

CAREvent®
ATV/ATV+ & MRI
01CV6000 01CV7000
01CV6000 01CV7000
USER MANUAL
(FOR STANDARD AND G2K® MODELS)
CAREvent® ATV/ATV+ & MRI User Manual - REV 24 Mar, 2020
CAREvent® ATV+
01CV6000
CAREvent® ATV+
01CV7000

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CAREvent® ATV/ATV+ & MRI - User Manual
TABLE OF CONTENTS
1. Introduction 4
1.1. Warranty 4
1.2. Warnings 4
1.3. Terms and Definitions 6
1.4. CAREvent® MRI 7
1.5. General Information 7
1.6. General Description 8
1.7. Principles of Operation 9
1.8. Modes of Operation 9
1.9. Alarms and Gauges 11
1.10. Accessories 13
1.11. Control Adjustment 14
1.12. Technical Data 15
2. Preparation for Use 17
2.1. Component List 17
2.2. Connection of Hoses 18
2.3. Pre-use Functional Check 18
3. Operating Instructions 22
3.1. Setting of the Ventilation Parameters 22
3.2. Frequency/Minute Volume Chart 22
3.3. Operation in Extreme Conditions 23
4. After Use Cleaning and Testing 23
4.1. Dismantling and Cleaning 23
4.1.1. Changing the Air Intake Filter 24
4.2. After Use and Monthly Checking 24
5. Maintenance Schedule 25
5.1. Annual Preventative Maintenance Inspection 25
6. Trouble Shooting Chart 26
7. CAREvent® Accessories 27

4CAREvent® ATV/ATV+ & MRI - User Manual
1. Introduction
1.1. Warranty
WARRANTY
The CAREvent® ATV+ and MRI are manufactured from the finest
quality materials. Each individual part is subject to strict quality control
tests to ensure exceptionally high standards. The manufacturer
warrants to the purchaser of the Automatic Transport Ventilator
that its component parts are free from defects in material and
workmanship for a period of two years from the date of purchase.
The manufacturer will replace and/or repair all parts of the Automatic
Transport Ventilator at its option for two years from the date of
purchase at no cost to the purchaser, upon the notification
of the defects, in writing by the purchaser and confirmation of said
defect by the manufacturer. All shipping costs shall be borne by the
purchaser. The manufacturer shall be liable under this warranty only
if the Automatic Transport Ventilator and its parts have been
used and serviced in the normal manner described in the instruction
manual. There are no other expressed or implied warranties. This
warranty gives no specific legal rights.
Note: THIS DEVICE MUST BE SERVICED BY AN O-TWO SYSTEMS
AUTHORIZED SERVICE CENTER.
1.2. Warnings
The CAREvent® ATV+ and MRI are intended for use by suitably
trained and qualified personnel.
The following precautions should always be observed:
1. Read this manual prior to attempting to use the ventilator.
2. When the unit is in use, do not smoke or use near open flame
either during use or when changing the cylinder.
3. When not in use, always turn o the gas supply.
4. Never allow oil or grease to come into contact with any part of
the cylinder, regulator or ventilator.
5. This device is not designed for use with heated humidifiers.
6. This resuscitator is not recommended for use on neonates
and pregnant or nuring women.

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CAREvent® ATV/ATV+ & MRI - User Manual
7. Do not disassemble any part of the ventilator except where
described in this manual as any unauthorized disassembly
will invalidate the warranty.
8. After use, always ensure that all components are cleaned
in accordance with the instructions provided in this manual.
(See section 4)
9. Always use the check list to ensure thatall components are
reassembled correctly and ready for use.
10. It is recommended that an alternative means of ventilating the
patient be available in case of gas supply failure.
11. During use, the patient should not be left unattended.
12. The use of this device in areas where the ambient air may be
hazardous or explosive should be avoided as entrainment
of ambient air during the use of the air mix mode will permit
the patient to inhale atmospheric gas.
13. Only the CAREvent® MRI unit may be used in a magnetic
resonance imaging department.
14. Only patient circuits supplied by o-two systems should be
used, as the use of other circuits may adversely aect the
output performance of the ATV.
15. The use of gas pressure regulators that do not maintain
a minimum output pressure and flowrate in line with the
requirements of the specification may cause the device to fail
resulting in the patient not being ventilated.
16. The use of this device in carring case of any type may,
when used in the 60% air mix mode, result in an increase in
oxygen concentration. If the air mix mode is to be used it
is recommended that the ventilator be placed in its normal
operating orientation and that the air intake on the rear of the
ventilator is not obstructed.

6CAREvent® ATV/ATV+ & MRI - User Manual
1.3. Terms and Definitions
Airway Resistance: Pressure drop across the airway per unit flow.
ATV: Automatic Transport Ventilator
CMV: Controlled Mandatory Ventilation.
CPAP: A positive pressure applied to the lungs during all
ventilation phases (Continuous Positive Airway Pressure).
Demand Valve: A valve that delivers gas to the patient at a flowrate equivalent
to that demanded by the patient’s inspiratory eort.
Expiratory Phase: The time period from the end of the inspiratory
flow to the end of the expiratory flow.
Expiratory Time (Te): Duration of the expiratory phase.
Frequency (f): The number of breaths in one minute
(also expressed as BPM).
Inspiratory Flow: The flow delivered to the patient by the ventilator
during the inspiratory phase.
Inspiratory Phase: The interval from the start of the inspiratory flow
to the start of the expiratory phase.
Inspiratory Time (Ti): Duration of the inspiratory phase.
Lung Compliance: Volume added per unit pressure increase when
gas is added to a human or artificial lung.
Maximum Patient
Inflation Pressure:
The maximum airway pressure delivered by the ventilator
to the patient.
Minute Volume (Vm): The total volume of gas delivered to the patient
in one minute.
Oxygen
Concentration:
The oxygen content of the inspired gases
expressed as a percentage.
Proximal Airway
Pressure: The airway pressure measured at the patient valve.
Patient Valve:
The valve which directs the flow of gas into the
lungs and out of the expiratory port to atmosphere
during expiration.

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CAREvent® ATV/ATV+ & MRI - User Manual
PEEP Valve:
A device which, when attached to the expiratory
port of the patient valve, holds a positive pressure
in the patients airway at the end of the expiratory
phase. (Positive End Expiratory Pressure)
Pressure Relief
Valve:
Valve which limits the maximum lung inflation pressure
by venting excess gas to atmosphere.
Tidal Volume (Vt): Volume of gas delivered to the patient during
each inspiratory phase.
G2K® :
Guidelines 2000 compliance. Complies with the
requirements of the ERC and AHA for 15:2
compression : ventilation ratio.
1.4. CAREvent® MRI
The CAREvent® MRI has been designed to meet the requirements
of ventilation within the MRI environment. The CAREvent® MRI has
been tested in a 1.5 Tesla MRI environment (unshielded magnet -
spatial gradient of <23Mt/m/sec and a slew rate of 120 T/m/sec
at an RF transmitter power of 2000 watts) and a 3.0 Tesla MRI
environment (unshielded magnet - spatial gradient of < 40Mt/m/
sec and a slew rate of 150 T/m/sec at an RF transmitter power
of 8000 watts) during a head phanton spectroscopy test scan
with the device located no less than 12 inches from the magnet
aperture which would be its normal use position during clinical
use.
In addition, the CAREvent® MRI model can be attached to the
CAREvent® MRI mounting plate or attachment to a cart or wall/
medirail mounting bracket.
1.5. General Information
The CAREvent® ATV+ and MRI are designed for use in the
prehospital, intrahospital, interhospital and air ambulance settings.
Designed to be used by suitably trained personnel, the various
modes of operation of the device support the resuscitation and
transportation of a wide range of patients (from infants to adults)
who require ventilatory support. The features and controls oered
by the device comply with the various International Standards for
Transport Ventilators.

8CAREvent® ATV/ATV+ & MRI - User Manual
The G2K® models have been manufactured to comply with the
latest Guidelines 2000 for CPR and ECC from the European
Resuscitation Council and the American Heart Association.
1.6. General Description
The CAREvent® ATV+ and MRI consist of a ruggedly constructed,
portable control module, input hose and optional single use
(or reusable where available) patient circuit. The ergonomically
designed control groupings facilitate the selection and setting of
the breathing parameters. The colour groupings provided on the
controls adds to this ease of use concept.
The unique pneumatic alarm for low input pressure improves
the level of safety for the patient by warning the operator of any
problems of insuIcient or failed gas supply.
The air mix capability of the ventilator improves the operating time
on bottled oxygen for long duration transports. The extremely
low drive gas consumption ensures full utilization of the cylinder
contents.
Controls
The controls provided are as follows:
• Ventilation Frequency
• Pressure Relief (Proximal Airway Pressure)
• Minute Volume
• Delivered Oxygen Concentration (%)
• Manual Ventilation
• Manual/AUTO Selector
• CPAP/PEEP Control
• BSI Alarm Silence Button
Visual Indicators
• Proximal Airway Pressure Gauge (cmH2O)
• Gas Supply Status Indicator
• BSI Alarm Indicator
Connections
Connections are provided on the side of the ventilator for the
Oxygen Input and the Gas Output.

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CAREvent® ATV/ATV+ & MRI - User Manual
1.7. Principles of Operation
The CAREvent® ATV+ and MRI are time-cycled, Intermittent
Positive Pressure devices providing a range of frequencies
of ventilation and Minute Volume settings to provide a
comprehensive range of delivered tidal volumes and ventilation
rates. The design of the micro-pneumatic circuitry in the
Automatic Transport Ventilator maintains a consistent I:E ratio
of 1:2 across the Minute Volume/frequency combinations to
optimise the exchange of gases in the alveoli. This helps avoid
the risk of inconsistent ventilations and protracted expiratory
times that may cause additional physiological acidosis or short
inspiratory times that may not allow for complete alveolar filling
or may generate high airway pressures.
1.8. Modes of Operation
Automatic Ventilation Mode
In the automatic mode (selected by turning the Manual/AUTO
Selector on the ventilator control panel to AUTO while pressing
and holding the Selector Release Button) the ventilator will supply
the patient with positive pressure ventilations of a frequency
and minute volume as selected using the Ventilation Frequency
and Minute Volume Selectors on the front panel. The I:E ratio is
maintained at a constant 1:2 to ensure that good gas exchange
takes place in the lung.
Manual Ventilation Mode
To allow the operator to control the patient’s breathing manually,
a Manual Ventilation Override button is located on the front
panel. In the AUTO mode, when the Manual Override Button is
depressed, the ventilator will cease automatic cycling and will
deliver a constant flowrate equivalent to that selected on the
flowrate selector for as long as the button is depressed. Releasing
the button will allow the ventilator to re-cycle into an automatic
ventilation mode following a delay period of approximately 1.5
times the expiratory time for the frequency setting selected
(10 seconds in the G2K® model). This delay allows the operator
sucient time to provide chest compressions or initiate a further
manual breath should they so wish. If the Manual Override Button
is depressed for too long the patient is protected from high airway
pressure by the Pressure Relief system.
Note: The design of these ventilators does not incorporate a negative
pressure phase during either automatic or manual ventilation.

10 CAREvent® ATV/ATV+ & MRI - User Manual
In the Manual mode, depressing the Manual override button will
allow the operator to manually ventilate the patient at a flowrate
equivalent to the Minute Volume selected.
Demand Breathing
During automatic ventilation, the Demand Breathing mode will
allow the patient to commence spontaneous breathing through
the ventilator while causing the automatic cycling to cease. As
with the Manual Override, there is an increase in the expiratory
time before the next automatic breath is delivered to allow the
patient to continue demand breathing. This system ensures that
the patient receives a sucient minute volume should their
inspiratory eorts be erratic. Demand Breathing is available to
the patient in both the inspiratory and expiratory phases of the
ventilation cycle.
In the Manual mode the patient can Demand Breathe at their own
rate and volume.
Note: It is important to constantly observe the patient’s respirations
to ensure that adequate perfusion is occurring.
Note: If used in conjunction with external chest compressions the
Auto Circuit Shut O function may be actuated should the
depth of compression create sucient tidal volume on chest re-
coil. Under these circumstances a manual breath may be delivered
(if deemed necessary) between sets of compressions.
Note: Small children may not be able to demand at a sucient
flowrate to disable the automatic cycling.
Adjustable Pressure Relief
This control allows the operator to vary the maximum delivered
airway pressure. This is achieved by diverting the excess delivered
volume to atmosphere should the set airway pressure be reached.
Air Mix Mode
To conserve oxygen during long transports or when a patient’s
respiratory condition demands an oxygen concentration of less
than 100%, the air mix mode can be selected. This reduces the
oxygen concentration to 60%. In this mode the ventilator entrains

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CAREvent® ATV/ATV+ & MRI - User Manual
Note: Due to the design of the micro-pneumatic circuit, increasing
pulmonary resistance has little eect on the delivered tidal
volume or respiratory rate. Research has shown that decreasing
pulmonary compliance in the infant Minute Volume settings may
give a minimal increase in the delivered oxygen concentration
when used in the Air Mix mode.
Emergency Air Intake System for Gas Supply Failure
In accordance with the International Standards for this type of
device, the ventilator is equipped with a failsafe Emergency Air
Intake circuit which allows the spontaneously breathing patient
to draw ambient air through the circuit should the gas supply fail.
1.9. Alarms and Gauges
The alarm systems in the Automatic Transport Ventilator provide
an audible indication of any inconsistencies in the patients
breathing and warn of a loss of driving pressure from the gas
supply. The alarms function as follows:
Low Input Pressure Alarm - Gas Supply
A low frequency oscillating alarm occurs when the gas supply
reaches the minimum safe operating pressure. (See also Gas
Supply Status indicator).
p = Audible Pulsed Tone t = Time
ambient air into the system and automatically reduces the oxygen
flow to maintain a consistent tidal volume. By using this mode the
operating time on the cylinder supply is significantly increased.
Fig. 1 - Graphic illustration of the audible alarm signal
WARNING
When this alarm sounds, immediately change the gas supply.

12 CAREvent® ATV/ATV+ & MRI - User Manual
Airway Over Pressure Alarm – Pressure Relief
Continuous tone of a low pitch during the inspiratory phase of the
ventilation that indicates that the maximum airway pressure
selected has been reached.
Breathing System Integrity (BSI) Alarm
Pulsed tone of a high pitch which activates if the patient circuit
becomes disconnected or the airway pressure achieved does not
reach 10 cmH2O. Alarm can be silenced for 15 seconds by
depression of the BSI Alarm Mute Button (See also BSI Visual
Indicator).
Gas Supply Status Indicator
Located on the front panel, this visual indicator will show green
when gas is supplied to the ventilator. Used in conjunction with
the Low input pressure alarm, this indicator provides an additional
reference for the operator as to the ventilators gas supply status.
BSI Alarm Visual Indicator
Located on the front panel above the airway pressure gauge, this
visual indicator will flash red in time with the BSI Audible Alarm
when the patient circuit is disconnected or insucient airway
pressure is being produced.
p = Audible Pulsed Tone t = Time
p = Audible Pulsed Tone t = Time
Fig. 2 - Graphic illustration of the Pressure Relief audible alarm signal
Fig. 3 - Graphic illustration of the BSI audible alarm signal
Inspiration
Expiration

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CAREvent® ATV/ATV+ & MRI - User Manual
1.10. Accessories
Supply Hose
The supply hose is a standard armoured oxygen hose with a 9/16
DISS threaded connection for the ventilator.
Single Use and Reusable Patient Circuits
The Single Use Deluxe Transport Ventilation Circuits and Deluxe
Reusable Patient Circuits are comprised of a patient valve housing
and 22 mm tubing. The expiratory port is configured to accept
either 30 or 19 mm PEEP valves. The 22 mm corrugated tubing is
easily attached to the patient circuit output connector on the side
of the ventilator. (fig 5.)
Note:
1. The choice of using either a Single Use or Reusable circuit is
at the discretion of the user. Only patient circuits supplied by
O-Two Medical Technologies Inc. should be used.
2. The use of a Bacterial/Viral filter is recommended to reduce the
potential for cross infection and contamination of the reusable
patient circuit. If used, the Bacterial/Viral filter must be used on
a single patient basis.
3. The use of a Bacterial/Viral Filter in conjunction with a reusable
patient circuit does not guarantee that the patient circuit will
remain free of contamination.
4. The use of a bacterial/viral Filter on any of the CAREvent®
circuits will increase inspiratory resistance and if used on the
distal side of the patient valve will increase deadspace.
Airway Pressure Gauge
Located on the front panel of the ventilator, this gauge provides
the operator with a visual indication of the airway pressure being
reached during the ventilation cycle.
Note: Careful consideration should be given to the use of a reusable
patient circuit on more than one patient. Single use circuits are not
designed for use on more than one patient and must be discarded
after each use. The manufacturer recommends that circuits are
used on a per patient basis and reusable circuits should be cleaned
and single use circuits discarded, after each use.
Note: The patient valve assembly is flow direction sensitive. Ensure
that the patientcircuit is attached to the ventilator correctly.

14 CAREvent® ATV/ATV+ & MRI - User Manual
Note: All selector positions are as viewed from the front of the ventilator.
1.11. Control Adjustment
The ventilator is equipped with a number of selectors depending on
the model. Each selector is actuated by the following method (Fig 4).
1. Ventilation Frequency (BPM): Located on the top right hand
side of the control panel. Rotary control with an anti-clockwise
rotation from low to high.
2. Minute Volume (Litres): Located on the bottom right hand
side of the control panel. Rotary control with a clockwise
rotation from high to low.
3. Pressure Relief (Maximum Delivered Airway Pressure (cmH2O):
Located on the top of the control panel slightly left of center.
Rotary control with a clockwise rotation from low to high.
4. Delivered O2Concentration(%): Located on the bottom left
hand side of the control panel. Rotary control with a clockwise
rotation from low to high.
5. Manual Ventilation: Located on the lower center section of
the control panel activated by depression of the button.
6. Manual/Auto Selector and Selector Release Button: Located
on the front panel of the ventilator. Rotary control with a
clockwise rotation from Manual to Auto.
7. CPAP/PEEP Control: Located on the front panel of the ventilator.
Rotary control with a clockwise rotation from 0 - 20 cmH2O.
8. BSI Alarm Mute Button: Located on the front panel of the ventilator
above the pressure gauge. Activated by depression of the button.
CPAP/PEEP
Control
Adjustable
Pressure
Relief Airway
Pressure
Frequency (BPM)
Selector
Minute Volume
Selector
Gas Supply
Status Indicator
Bsi Alarm
Silence
Control
Bsi Alarm
Visual
Indicator
Manual/Automatic
Selector
Air Mix
Selector
Manual
Ventilation
Button
Fig. 4 - Front Panel Layout for ATV+ and MRI models
Selector Release
Button

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CAREvent® ATV/ATV+ & MRI - User Manual
1.12. Technical Data
(All specifications are subject to a tolerance of +/- 10% except the I:E
Ratio which is subject to a tolerance of +/- 20% and Maximum Airway
Pressure +0/-15%)
Minute Volume Range: 2 - 14 L/min (+/- 10%)
Frequency Range: 8 - 40 BPM (+/- 10%)
I:e Ratio: 1:2 (+/- 20%)
Input Pressure: 45 - 70 PSI (3 - 5 Bar)
Automatic/Manual Flowrate: 6 - 42 L/min (+/- 10%)
Manual Overide Delay Time: 5 – 8 sec
9 -11 sec for G2K® Model
Demand Breathing Flowrate: >100 L/min @ -6 cmH
2
0 (hPa)
Demand Breathing Triggering
Pressure: -2 cmH
2
0 max
Auto Shut O Delay Time: 4 - 7 sec
CPAP/PEEP: 0 - 20 cmH
2
0 (+/- 10%)
Oxygen Concentration: 60 or 100 %
Inspiratory/Expiratory Resistance: < 6 cmH
2
0 (hPa) @ 60 L/min
Operating Temperature: -18
o
C to + 50
o
C / 0
o
F to +122
o
F
Storage Temperature: - 40
o
C to + 60
o
C / - 40
o
F to + 140
o
F
Gas Supply Status Indicator: Provides a visual Indication of gas
Supply status.
Pressure Relief Range: 20 (+/- 20%) - 60 (+0%/- 17%) cmH
2
0
19.6 TO 58.8 mBar

16 CAREvent® ATV/ATV+ & MRI - User Manual
Low Input Pressure Alarm:
Audible pulsed alarm to indicate
input pressure is dropping below the
minimum requirement. Cannot be
switched o.
Airway Pressure Alarm:
Audible alarm to indicate that the
selected peak airway pressure has
been reached.
BSI Alarm:
Audible high frequency pulsed alarm
indicating that the patient circuit is
disconnected or insucient
ventilation pressure (<10 cmH
2
O)
has been attained
Pressure Gauge
Accuracy: ± 2% Full Scale
Input Connection: 9/16” DISS
Patient Connection: 15 / 22 mm
Dimensions: 9.27 X 7.6 X 4.4 INCHES
236 X 194 X 112 MM
Weight: 2.84 Kg Approx for ATV+
3.0 Kg Approx for MRI
Patient Valve Dead Space: 8 ml
Cylinder Duration
(Aluminum “D” size cylinder containing 415 Litres of oxygen.):
On 100% Setting:
(a) 2 Litre Mv 207 minutes
(b) 14 Litre Mv 30 minutes
On 60% Setting:
(a) 2 Litre Mv 345 minutes
(b) 14 Litre Mv 50 minutes

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CAREvent® ATV/ATV+ & MRI - User Manual
MRI Test Condition Parameters:
The CAREvent® MRI has been tested in a 1.5 Tesla MRI environment
(unshielded magnet - spatial gradient of < 23Mt/m/sec and a slew
rate of 120 T/m/sec at an RF transmitter power of 2000 watts)
and a 3.0 Tesla MRI environment (unshielded magnet - spatial
gradient of < 40Mt/m/sec and a slew rate of 150 T/m/sec at an
RF transmitter power of 8000 watts) during a head phanton
spectroscopy test scan with the device located no less than 12
inches from the magnet aperture which would be its normal use
position during clinical use.
Note: When tested as indicated above, the spectroscopy traces
were not aected in any way by the CAREvent® MRI ventilator, and
the CAREvent® MRI ventilator functioned to specification.
Note: If any components are missing from the shipping carton,
immediately call the supplier quoting the packing slip number,
your original purchase order number and the description of the
item which is missing.
2. Preparation for use
2.1. Component List
Having unpacked the ventilator from its shipping carton, use the
following list to ensure that all components have been received:
1. Operating Manual
2. Ventilator
3. Supply Hose.
4. Single Use or Reusable Patient Circuit with Patient Valve
5. Calibrated Test Lung

18 CAREvent® ATV/ATV+ & MRI - User Manual
2.2. Connection of Hoses
The supply hose provided is attached to the input connection on
the side of the ventilator “finger tight” (fig 5).
2.3. Pre-use Functional Checks
Along with the contents of the shipping cartons you will require the
following items to enable you to undertake the pre-use functional check:
1. Full oxygen cylinder
2. Oxygen regulator with a 60 PSI 9/16 DISS outlet. The regulator
must be able to output a minimum of 100 L/min at no less
than 40.6 PSI (2.8 Bar). Calibrated Test Lung (supplied with
ventilator)
Having connected the supply hose to the regulator, ensure that the
ventilator Manual/AUTO Selector is in the Manual position and turn
on the oxygen supply. Using a mild soap solution, spray the input
connection to the ventilator to check for leaks. If any leak is present,
tighten the connection and re-test.
Once no leaks are found, connect the Test Lung to the 15/22 mm patient
connector on the Patient Circuit. Using the selectors on the front panel,
select a frequency of ventilation and a flowrate. Turn the Manual/AUTO
Control to the Auto position and the ventilator will commence cycling.
The patient circuit is attached to the gas outlet on the right hand
side of the control module by simply pushing the 22 mm taper over
the outlet.
WARNING
Using a wrench or excessive force in tightening the supply
hose may damage the seal or the thread of the connection.
Fig 5. - Connecting the Supply hose and Patient Circuit.
Supply Hose Patient Circuit

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CAREvent® ATV/ATV+ & MRI - User Manual
Testing of the Individual Features of the Ventilator.
The following features can be individually tested during the pre-
use Functional Check:
1. Airway Over Pressure Alarm, Pressure Gauge Function and
Pressure Relief Adjustment Function
2. Low Input Pressure Alarm
3. Frequency Adjustment
4. Flow Adjustment
5. Air Mix
6. Manual Ventilation
7. Demand Valve Function and Automatic Circuit Shut O
8. CPAP/PEEP Control
9. BSI Alarm
1. Airway Over Pressure Alarm, Pressure Gauge Function and
Pressure Relief Adjustment Function
With the ventilator connected to the 60 PSI source, set the
ventilator cycling at 12 BPM with a Minute Volume control setting
of 14 L. Set the adjustable Airway Pressure Control to 20 cmH2O.
Remove the Test Lung from the Patient Connector and occlude
the Patient Connector outlet. This will cause the Airway Over
Pressure Alarm to activate and a continuous tone will be heard
during the inspiratory cycle of the ventilator.
To confirm the pressure relief setting, observe the needle on the
Airway Pressure Gauge during the inspiratory cycle and ensure that
the needle reaches the 20 cmH2O mark. Now turn the Adjustable
Airway Pressure Selector to the 60 cmH2O position. Repeat the
test and observe that the needle reaches the 60 cmH2O mark.
2. Low Input Pressure Alarm
With the adjustable outlet pressure regulator set with an outlet
pressure of 60 PSI, set the ventilator cycling at 12 BPM with a
Minute Volume control setting of 14 L.
Note: To fully test this function it is necessary to have a supply
regulator with an adjustable output pressure. (Not supplied)
Checking of the alarm can be undertaken by simply slowly closing
the cylinder valve.

20 CAREvent® ATV/ATV+ & MRI - User Manual
As the ventilator cycles, gradually reduce the outlet pressure of
the regulator until you hear the Low Input Pressure Alarm activate.
This will be a slow, mid pitched, pulsed tone. Continue to decrease
the regulator outlet pressure and the tone will gradually slow in
frequency until it becomes a continuous tone. This indicates that
the drive gas is now exhausted to the point where the ventilator
will no longer function correctly.
3. Frequency Adjustment
With the ventilator connected to the 60 PSI source, set the
ventilator cycling at 8 BPM with a Minute Volume control setting
of 6 L. Connect the Test Lung to the Patient Connector and turn
the ventilator Manual/Auto Selector to the Auto position.
After every 5 breaths rotate the frequency control counter
clockwise to the next setting and observe the increasing frequency
of ventilation in the Test Lung. Repeat for every setting. If required,
a stopwatch may be used to check the frequency in each setting.
4. Minute Volume Adjustment
With the ventilator connected to the 60 PSI source, set the
ventilator cycling at 18 BPM with a Minute Volume control setting
of 2 L. Connect the Test Lung to the Patient Connector and turn
the ventilator Manual/Auto Selector to the Auto position.
After every 5 breaths rotate the Minute Volume control counter
clockwise to the next setting and observe the increasing expansion
of the Test Lung. Repeat for every setting. The increasing expansion
of the lung indicates an increase in the delivered tidal volume, as the
frequency remains constant so the delivered Minute Volume (tidal
volume x frequency) will increase with each increase in flowrate.
Note: When testing the lower Minute Volume settings using the
test lung provided, there may be insucient volume delivered with
each breath to attain an airway pressure that will cause the BSI
Alarm to be shut o. Under these circumstances simply depress the
BSI Mute Button to silence the alarm.