Caradyne Whisperflow 2 User manual
Whisperflow 2
CPAP System
User’s Manual
Table of contents
Table of contents ........................................................ ii
Introduction .................................................................1
How it works ...............................................................2
Setting up the Whisperflow 2 System.........................2
Using Whisperflow 2 with Criterion 60........................7
Operating the Whisperflow 2 System .......................14
Monitoring the patient ...............................................15
Maintenance .............................................................15
Environmental specifications ....................................16
Accessories ..............................................................19
Service......................................................................19
Warranty ...................................................................19
Approvals..................................................................19
Manufacturer.............................................................20
Year of manufacture .................................................20
Introduction
The Whisperflow 2 CPAP System delivers continuous positive
airway pressure (CPAP) throughout the breathing cycle. It
provides CPAP at preset levels throughout inspiration and
exhalation, independent of the patient's flow rate. The
Whisperflow 2 is intended for use on spontaneously breathing
patients, and allows you to adjust FIO
The Whisperflow 2 controls are easy to use, and a swivel
elbow outlet port simplifies circuit configuration. An internal
safety valve eliminates the need for a separate pressure relief
valve and tee.
The Whisperflow 2 can be pole or bench mounted, and can
be attached to Caradyne’s Criterion monitors (Figure 1) to
create a system that delivers CPAP and measures applicable
from 28 to 100%.
2
Criterion 60
Whisperflow 2
parameters.
Figure 1. Whisperflow 2 CPAP System
with Criterion Monitor
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The Whisperflow 2 System may be contraindicated for
patients with any of these conditions:
• Fluid retention
• Pneumothorax
• Decreased cardiac output and gastric distention
• Severe facial injury (noninvasive use)
• Hypotension secondary to hypovolemia.
How it works
The Whisperflow 2 CPAP System is a precision venturi device
that uses an oxygen supply in conjunction with entrained air to
generate an output flow. The Whisperflow 2 System uses a 60
psi (412 kPa) oxygen supply, and can generate flows over
140 L/min with a minimum fractional inspired oxygen (FIO
28%. The Whisperflow 2 CPAP valves use constant force
springs to maintain the preset positive pressure at flow rates
from 10 to 140 L/min.
2
) of
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Setting up the Whisperflow 2 System
WARNING:
• Always use the Whisperflow 2 System with
an oxygen analyzer to alert you to a loss of
oxygen wall pressure or other system faults.
For complete control of the CPAP therapy,
Caradyne recommends using the Criterion
60 Pressure and Oxygen monitor.
• Always ensure that the CPAP valve is
correctly connected to the patient circuit,
and that the exhaust port of the CPAP valve
is not attached to the circuit.
• Use an in-line tee to insert a pressure gauge
or pressure monitor (such as the Criterion 40
or Criterion 60) between the output port of
the Whisperflow 2 and the patient interface.
• The Whisperflow 2 (as is typical of other
CPAP systems) does not include a nonrebreathing valve for use with tracheal tubes.
Oxygen supply failure during tracheal tube
connection can result in rebreathing and
asphyxiation.
CAUTION: To avoid damage to the Whisperflow 2
System by entraining particles into the device, always
install a filter (P/N 8-100471-00) on the fresh gas intake
port.
1. Select a sealing face mask or endotracheal (ET) tube as
the patient connection. Ensure that the mask fits
comfortably, seals the bridge of the nose, and fully covers
the nose and mouth.
2. Choose the CPAP valve (see the parts list for a complete
list of available CPAP valve sizes and part numbers).
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3. Assemble the circuit according to Figures 3 through 7,
depending on the mask, oxygen analyzer, and humidifier
used. As you assemble the circuit, please note:
• The Whisperflow 2 includes an internal safety valve
that automatically relieves pressure at approximately
28 cmH
O or above. To relieve pressure at lower
2
levels, use a separate pressure relief valve (use
safety valve tee, Caradyne part number 8-202502-00,
to insert a separate safety valve into the circuit).
• To ensure accurate measurement of the FIO
2
delivered to the patient, use an inline oxygen analyzer
upstream of the humidification device (if used).
• The Whisperflow 2 System can deliver a minimum
of 28-29% to the patient. However, the longer
FIO
2
the tube lengths used, the higher the minimum FIO
(longer tubing increases the resistance of the patient
circuit, allowing Whisperflow 2 to entrain less air).
• The Whisperflow 2 System's location upstream of the
patient and the high flows it produces make
contamination and cross-infection highly unlikely.
However, if cross contamination is a concern, attach
a 22-mm filter to the output port of the Whisperflow 2.
• Use the Whisperflow 2 with accessories supplied by
Caradyne, Ltd. or authorized representative.
Caradyne supplies face masks with an integral oneway valve that prevents exhalation into the supply gas
tubing in the event of supply gas failure. However,
when used with a tee piece, exhalation into the supply
tubing can result in rebreathing and asphyxia.
• Caradyne supplies face masks with an integral one-
way valve that minimizes the risk of asphyxia in case
of supply gas failure. However, a face mask with oneway valve results in an increased work of breathing in
the event of loss of oxygen that may not be well
tolerated by all patients. Do not use a mask or
tracheal tube connection when there is no oxygen
flow from the Whisperflow 2.
2
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• Use an external monitor (such as a Criterion monitor)
to ensure that the Whisperflow 2 is supplying
adequate flow to the patient. If flow is adequate, an
in-line pressure gauge or pressure monitor shows a
constant pressure approximately equal to the PEEP
valve specification. A significant (2 cmH
O or more)
2
pressure drop when the patient inhales indicates
inadequate flow: increase flow from the Whisperflow
2.
• Use an oxygen monitor with alarms (such as the
Criterion 60 Pressure and Oxygen monitor) to set and
monitor the FiO
delivered by the Whisperflow 2. An
2
oxygen monitor can signal loss of oxygen flow if the
patient continues to draw fresh gas without oxygen
through the air inlet of the Whisperflow 2.
• The Whisperflow 2 is shipped with covers for the
oxygen sensor and pressure ports. Keep these
covers in place whenever the ports are not in use.
Remove the oxygen sensor cover before installing a
Criterion 60 oxygen sensor. Remove the pressure
port cover when installing a pressure line to the
Whisperflow 2.
• When using the Whisperflow 2 pressure port, take
into consideration that the pressure reading includes
the pressure drop due to the resistance of the patient
circuit. For example, if the pressure at the patient’s
mask is 5 cmH
resistance of the circuit at the current flow is 2 cmH
then the monitor pressure reading is 7 cmH
0 and the pressure drop due to the
2
0.
2
0,
2
Because high pressure alarms are typically set 10
cmH
0 or more above peak inspiratory pressures, the
2
Whisperflow 2 pressure port is appropriate for use
where the pressure drop due to patient circuit
resistance is not significant. At very low patient
ventilation pressures when small variations in
pressure can be significant, measure pressure at the
patient connection to eliminate the effect of patient
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circuit resistance. Replace pressure tubing and filter
monthly during normal use.
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