babylog_8000___8000sc_and_8000_plus__technical_docu.pdf
Page 1
Technical Service Manual
Babylog 8000/8000SC/8000 plus
Intensive Care Ventilator
Revision 10.0
6173.3
9029623
Emergency Care • Perioperative Care • Critical Care • Perinatal Care • Home Care
Because you care
Page 2
Copyright by Dräger Medical AG & Co. KGaA, Lübeck, Germany.
No reproduction allowed for commercial purposes.
Read and understand the Instructions for Use/Operator’s Manual.
This Technical Documentation does not replace the Instructions for Use/Operator’s
Manual.
The warranty and liability conditions of the general terms and conditions for business
transactions of Dräger Medical AG & Co. KGaA are not extended by this Technical
Documentation.
Observe all applicable technical laws and regulations.
Insofar as reference is made to laws, regulations or standards, these are based on the
legal system of the Federal Republic of Germany. Observe the laws and regulations
applicable in your country.
Page 3
Contents
General
1
Notes
1.1
9
Symbols and Definitions ......................................................................................................... 9
Function Description
1
2
3
4
General
1.1
Ventilation Modes ................................................................................................................. 13
1.2
Additional Functions ............................................................................................................. 13
1.3
Monitoring ............................................................................................................................. 13
Block Diagrams
All rights reserved. Copyright reserved.
14
2.1
Block Diagram of the Components in
Babylog 8000/Babylog 8000 SC with LC Display 14
2.2
Block Diagram of the Components in
Babylog 8000/Babylog 8000 plus with EL Display 15
2.3
Block Diagram of the Babylog 8000/ Babylog 8000 plus/Babylog 8000 SC ........................ 16
Airway Monitoring
17
3.1
Airway Pressure ................................................................................................................... 17
3.2
Trigger Signal ....................................................................................................................... 17
3.3
Measurement of the Fraction of Inspired O2 ....................................................................... 17
3.4
Patient Flow (Babylog 8000/Babylog 8000 plus) .................................................................. 18
Monitoring Functions
4.1
GBK61733XXIECIVZ.fm 18.05.05
13
19
Fraction of inspired O2 (FiO2) ............................................................................................... 19
4.1.1
O2 Measurement .................................................................................................... 19
4.1.2
O2 Calibration ......................................................................................................... 19
4.2
Gas Supplies ........................................................................................................................ 20
4.3
Airway Pressure Monitoring ................................................................................................. 20
4.4
Disconnect Monitoring .......................................................................................................... 20
4.5
Overpressure and Low Pressure Alarms ............................................................................. 21
Dräger Medical AG & Co. KGaA
Contents
I
Page 4
Contents
4.6
4.5.1
Babylog 8000 up to Software Version 3.0 ............................................................... 21
4.5.2
Dynamic Stenosis Limit ........................................................................................... 21
Minute Volume Monitoring (Babylog 8000/Babylog 8000 plus) ............................................ 23
4.6.1
Babylog 8000 with Software Versions 2 and 3 ....................................................... 23
4.6.2
Babylog 8000 Software with Version 4.0 or Higher ................................................ 23
4.6.3
Babylog 8000 plus .................................................................................................. 23
4.7
Audible Alarm Generator Monitoring .................................................................................... 23
4.8
Operating Voltage Monitoring ............................................................................................... 23
4.9
Rotary Potentiometer Monitoring .......................................................................................... 23
4.10 ROM Test .............................................................................................................................. 24
4.11 RAM Test .............................................................................................................................. 24
4.12 Temperature Monitoring ........................................................................................................24
4.13 Relay and Valve Monitoring .................................................................................................. 24
4.14 Battery Monitoring ................................................................................................................ 24
4.15 Flow Measurement Monitoring (Babylog 8000/ Babylog 8000 plus) .................................... 24
5
6
Alarms, Cautions and Advisory Messages
5.1
Message Display .................................................................................................................. 25
5.2
Display and Menu ................................................................................................................. 25
5.2.1
Babylog 8000/Babylog 8000 SC with LC Display ................................................... 26
5.2.2
Babylog 8000/Babylog 8000 plus with EL Display .................................................. 26
Function of the Control Elements
6.1
27
Potentiometers (Rotary Knobs) ............................................................................................ 27
Fraction of inspired O2 (O2 vol.%) .......................................................................... 27
6.1.2
Inspiratory time (TI) ................................................................................................. 27
6.1.3
Expiratory time (TE) ................................................................................................ 27
6.1.4
Inspiratory flow (Insp. Flow) .................................................................................... 27
6.1.5
Inspiratory pressure limit (Pinsp) ............................................................................. 27
6.1.6
PEEP/CPAP ............................................................................................................ 27
Keys ...................................................................................................................................... 28
Dräger Medical AG & Co. KGaA
Contents
GBK61733XXIECIVZ.fm 18.05.05
6.1.1
All rights reserved. Copyright reserved.
6.2
II
25
Page 5
Contents
7
8
All rights reserved. Copyright reserved.
GBK61733XXIECIVZ.fm 18.05.05
9
10
6.2.1
CPAP ...................................................................................................................... 28
6.2.2
IPPV/IMV (CMV) (up to software version 4.n) ........................................................ 28
6.2.3
Man. Insp. ............................................................................................................... 28
6.2.4
2-min Silence .......................................................................................................... 28
6.2.5
Reset/Check (OK) .................................................................................................. 28
6.2.6
Backlight On/Off (Babylog 8000/8000 SC with LC Display) ................................... 28
6.2.7
"Cal. Config." (as of software version 5.n) .............................................................. 29
6.2.8
Keys ....................................................................................................................... 29
Cold Start/Warm Start Behavior
30
7.1
Cold-Start Behavior .............................................................................................................. 30
7.2
Warm-Start Behavior ............................................................................................................ 30
Description of Pneumatic Functions
31
8.1
Gas Supplies ........................................................................................................................ 31
8.2
Controlled Ventilation ........................................................................................................... 32
8.2.1
Inspiration ............................................................................................................... 32
8.2.2
Expiration ............................................................................................................... 33
8.2.3
PEEP ...................................................................................................................... 33
8.2.4
CPAP ...................................................................................................................... 33
Measurement of the Ventilation Parameters
34
9.1
O2 Measurement .................................................................................................................. 34
9.2
Measurement of the Airway Pressure .................................................................................. 34
9.3
Pneumatics Control PCB ...................................................................................................... 35
9.4
Pneumatics Analog PCB ...................................................................................................... 36
9.5
Patient System Heater ......................................................................................................... 37
9.6
Pressure Sensor Base PCB ................................................................................................. 37
9.7
O2 Amplifier PCB ................................................................................................................. 37
Components of the Electronic Assembly
38
10.1 Power Supply Unit ................................................................................................................ 38
Dräger Medical AG & Co. KGaA
Contents
III
Page 6
Contents
10.2 Motherboard PCB ................................................................................................................. 38
10.3 CPU 68000 PCB ................................................................................................................... 39
10.4 I/O PCB ................................................................................................................................ 40
10.5 Flow PCB (Babylog 8000/Babylog 8000 plus) (optional) ...................................................... 41
10.6 Monitoring PCB .................................................................................................................... 42
10.6.1
Measurement of Analog Signals ............................................................................. 42
10.6.2
Measurement of Digital Inputs ................................................................................ 42
10.6.3
Measurement of Digital Outputs ............................................................................. 42
10.7 Front Adapter PCB ............................................................................................................... 45
10.8 Front Controller PCB
(Babylog 8000/Babylog 8000 SC with LC Display) 46
10.9 Front PCB (Babylog 8000/Babylog 8000 plus with EL Display) ........................................... 47
10.10Display PCB (Babylog 8000/Babylog 8000 SC with LC Display) ......................................... 48
10.11 EL display (Babylog 8000/Babylog 8000 plus with EL Display) ........................................... 49
10.12Potentiometer Field .............................................................................................................. 50
10.13Display Field ......................................................................................................................... 50
10.14Communication PCB ............................................................................................................ 51
10.15Interface PCB ....................................................................................................................... 52
11
Sensors
53
11.1 Pressure Sensors ................................................................................................................. 53
11.2 Y-Piece with Flow Sensor (Babylog 8000/Babylog 8000 plus) ............................................. 53
11.2.1
Measuring Principle of the Flow Measuring Bridge ................................................ 54
11.3 O2 Sensor ............................................................................................................................ 55
Dräger Medical AG & Co. KGaA
Contents
GBK61733XXIECIVZ.fm 18.05.05
All rights reserved. Copyright reserved.
IV
Page 7
Contents
Replacing Non Repairable Items
1
Important Information
59
2
Cleaning or Replacing the Cooling Air Filter Every 4 Weeks
60
3
Replacing the O2 Sensor Capsule
61
3.1
O2 Sensor Calibration ........................................................................................................... 61
3.2
Calibrating the O2 Sensor After Replacement ...................................................................... 61
3.3
Disposing of the O2 Sensor Capsule .................................................................................... 63
4
Replacing the Lip Seals Every 2 Years
64
5
Replacing the NiCd Battery (Power Failure Alarm) Every 2 Years
65
6
Replacing the Pressure Reducer Every 6 Years
67
Schematics and diagrams
1
Schematics and Diagrams
77
All rights reserved. Copyright reserved.
GBK61733XXIECIVZ.fm 18.05.05
Error List
1
Error messages
91
2
List of device error messages
92
Annex
Spare parts list
97
Test List
97
Technical Information according to EMC standard IEC/EN 60601-1-2:2001
97
Dräger Medical AG & Co. KGaA
Contents
V
Page 8
Contents
GBK61733XXIECIVZ.fm 18.05.05
All rights reserved. Copyright reserved.
Contents
Dräger Medical AG & Co. KGaA
VI
Page 9
General
7
Page 10
8
Page 11
Babylog 8000
1
Notes
General
This Technical Documentation/Service Manual conforms to the International
Standard IEC 60601-1.
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/Service Manual, the equipment may operate improperly or unsafely, or
the equipment could be damaged.
Use only original Dräger parts and supplies.
The maintenance procedures described in this Technical Documentation/Service Manual may be performed by qualified service personnel only.
These maintenance procedures do not replace inspections and servicing by
Dräger Medical AG & Co. KGaA.
Strictly follow the Instructions for Use/Operating Instructions! This
Technical Documentation does not replace the Instructions for
Use/Operating Instructions. Any use of the product requires full
understanding and strict observation of the product-specific Instructions for Use/Operating Instructions.
Unless otherwise stated, reference is made to laws, regulations or standards (as amended) applicable in the Federal Republic of Germany.
1.1
Symbols and Definitions
This symbol indicates a warning.
This symbol is used to alert against unsafe practices when handling electrostatic sensitive devices (ESD).
All rights reserved. Copyright reserved.
Version 1.0_ Released_Printed on_18.05.05_GBK61733XXA01.fm
This symbol indicates tips and useful information.
Definitions according to German standard DIN 31051:
Dräger Medical AG & Co. KGaA
Inspection
= examination of actual condition
Maintenance
= measures to maintain specified condition
Repair
= measures to restore specified condition
Servicing
= inspection, maintenance, and repair
6173.3
9
Page 12
10
Dräger Medical AG & Co. KGaA
6173.3
Version 1.0_ Released_Printed on_18.05.05_GBK61733XXA01.fm
All rights reserved. Copyright reserved.
General
Babylog 8000
Page 13
Function Description
11
Page 14
12
Page 15
Function description
1
Babylog 8000
General
Babylog 8000/Babylog 8000 plus has a flow measurement function. The Babylog 8000 SC can be
upgraded to a Babylog 8000 using the "flow measurement conversion kit.
1.1
Ventilation Modes
Babylog 8000/Babylog 8000 plus/8000 SC provides the following ventilation modes:
IPPV (Intermittent Positive Pressure Ventilation), controlled and assisted constant-volume ventilation
SIPPV (Synchronized Intermittent Positive Pressure Ventilation), synchronized controlled and
assisted constant-volume ventilation
IMV (Intermittent Mandatory Ventilation)
SIMV (Synchronized Intermittent Mandatory Ventilation) weaning method for spontaneously
breathing patients
CPAP (Continuous Positive Airway Pressure) spontaneous breathing with positive airway pressure
PSV (Pressure Support Ventilation) (optional as of software version 5.n)
1.2
Additional Functions
Babylog 8000/Babylog 8000 plus/8000 SC provides the following (optional) additional functions:
High-frequency ventilation (HV) (as of software version 4.n)
Volume guarantee (VG) (as of software version 5.n)
1.3
Monitoring
Babylog 8000/Babylog 8000 plus/8000 SC has integrated monitoring functions for:
Fraction of inspired O2 (FiO2)
Airway pressure (Paw)
All rights reserved. Copyright reserved.
_ _Printed on_18.05.05_F61733XXT01.fm
Flow ( ) (Babylog 8000/Babylog 8000 plus)
Minute volume (MV)
Tidal volume (VT)
Dräger Medical AG & Co. KGaA
6173.3
13
Page 16
Function description
Babylog 8000
2
Block Diagrams
2.1
Block Diagram of the Components in
Babylog 8000/Babylog 8000 SC with LC Display
Fan
RS232 PCB
O2 sensor
Pressure sensor PCB
Flow connector
Battery
O2 ampilfier
Loud speaker
Vol.% O2
pressure AIR
pressure O2
Pinsp
Pexsp
Elektronic unit
Flow PCB (not 8000SC)
Pneumatic
driver PCB
I/O PCB
Power cord
Power supply PCB
Patiententeilheating
Monitoring PCB
PEEP/PIP
Watch dog PCB
Valves
Communication PCB
Pneumatic Analog
PCB
LP Mutterboard
CPU 68000 PCB
Frontadapter PCB
Pneumatic unit
Fig. 1: Block diagram of the Babylog 8000/8000 SC with LC display
14
Dräger Medical AG & Co. KGaA
6173.3
_ _Printed on_18.05.05_F61733XXT01.fm
LC display
All rights reserved. Copyright reserved.
Potentiometer field
Display PCB
Front
Monitoring field
Frontcontroller PCB
Page 17
Function description
Block Diagram of the Components in
Babylog 8000/Babylog 8000 plus with EL Display
Pressure sensor PCB
Flow connector
Battery
Fan
RS232 PCB
O2 sensor
Loud speaker
Vol.% O2
pressure AIR
pressure O2
Pinsp
Pexsp
Elektronic unit
O2 amplifier
2.2
Babylog 8000
Pneumatic amplifier
PCB
Flow PCB
I/O PCB
Power cord
Power supply PCB
Patient unit
heating
Monitoring PCB
PEEP/PIP
Watch dog PCB
Valves
Ccommunication PCB
Pneumatic
Analog PCB
LP Mutterboard
CPU 68000 PCB
Frontadapter PCB
Pneumatic unit
All rights reserved. Copyright reserved.
_ _Printed on_18.05.05_F61733XXT01.fm
Potentiometer field
ELD converter
Front
Monitoring field
Front PCB
EL display
Fig. 2: Block diagram of the Babylog 8000/Babylog 8000 plus with EL display
Dräger Medical AG & Co. KGaA
6173.3
15
Page 18
Function description
2.3
Babylog 8000
Block Diagram of the Babylog 8000/ Babylog 8000 plus/Babylog 8000 SC
LC display
2 red Alarm LEDs
EL display (Babylog 8000/
Babylog 8000 plus)
LEDs
Potentiometer
keys
Front
Communication
Battery
CPU (Master)
Monitoring
Reserve
horn
Flow
Babylog 8000
Babylog 8000 plus
I/O
E
E
V
V
Flow sensor
E
E
E
P
P
PAIR
PO2
E
E
P
Pexsp
P
Pinsp
E
O
O
O2-Sensor
+27 V
+5 V
&
24 Ventile
Valve amplifier
PEEP/PIP valve
Valve monitoring
16
Dräger Medical AG & Co. KGaA
6173.3
_ _Printed on_18.05.05_F61733XXT01.fm
All rights reserved. Copyright reserved.
Fig. 3: Block Diagram of the Babylog 8000/Babylog 8000 plus/Babylog 8000 SC
Page 19
Function description
3
Babylog 8000
Airway Monitoring
In the ventilation modes IPPV/IMV and CPAP, the airway pressure (Paw), the flow at the Y-piece VT
(Babylog 8000/Babylog 8000 plus), and the fraction of inspired O2 (FiO2) are measured.
Depending on the selected mode and the menu settings, the parameters are monitored and displayed on
the screen. Pressure and flow curves as well as their storage can be displayed graphically on the LC
display or EL display. In all ventilation modes, the chronological sequence of the airway pressure (Paw) is
displayed in the LED bargraph.
3.1
Airway Pressure
Two internal pressure sensors measure the pressure at the inspiratory outlet (Pinsp) and the pressure at
the expiratory inlet (Pexp). The airway pressure is calculated as follows:
Paw = Pinsp – 0.7 (Pinsp – Pexp)
The following pressures are calculated from the Paw pressure signal:
Peak pressure (Peak)
Mean airway pressure (Pmean)
Positive end-expiratory pressure (PEEP)
The peak pressure is the maximum positive pressure of the most recent respiratory cycle. After 30 s, at
the latest, a new respiratory cycle must be recognized and a new measured value for the peak pressure
must be generated, otherwise the current measured value is no longer valid and is removed from the
display.
The mean airway pressure is the initial value of a software digital filter.
The PEEP is either the pressure value during the expiratory phase at a zero expiratory flow or the last
measured value before the next inspiration. Like the peak pressure, the PEEP is no longer valid after 30 s
and is removed from the display if a new measured value is not generated within the 30-s period.
3.2
Trigger Signal
All rights reserved. Copyright reserved.
_ _Printed on_18.05.05_F61733XXT01.fm
In order to generate a trigger signal, the inspiratory flow must be integrated during spontaneous breathing
and compared to the adjustable trigger threshold.
3.3
Measurement of the Fraction of Inspired O2
A O2 sensor in the inspiration line measures the O2 content of the respiratory gas.
Calibration data of the O2 sensor is maintained after switching off the Babylog. If the Babylog has been
out of operation for more than 24 hours, a calibration will automatically be carried out upon power-on.
The operator may also initiate a calibration manually, e.g. as required after replacing an O2 sensor.
Dräger Medical AG & Co. KGaA
6173.3
17
Page 20
Function description
Babylog 8000
A two-step calibration with 21% and 100% O2 is always carried out in order to achieve a higher
measurement accuracy over the whole concentration range and/or to be able to recognize a spent sensor
cell.
The calibration procedure is described under section "4 Monitoring Functions".
If the O2 measurement fails, the Babylog generates an alarm. This alarm status is shown in the status
field of the screen by the flashing indication "FiO2".
3.4
Patient Flow (Babylog 8000/Babylog 8000 plus)
A direction-sensitive hot-wire flowmeter integrated into the Y-piece measures the inspiratory and
expiratory flows through the tube. This measurement function must be reactivated each time after
switching on Babylog 8000/Babylog 8000 plus and after each replacement of the sensor by calibrating the
sensor. The flow signal is used to calculate the following values:
Tidal volume (VT)
Minute volume (MV)
Percentage of the MV uptake through spontaneous breathing
Tube leakage
The tidal volume is the expiratory flow signal applied between two breathing phase cycles.
Unlike the tidal volume, the minute volume is not related to a respiratory cycle. In the same way the
inspiratory MV is calculated for leak rate detection. The expiratory minute volume is displayed. In addition
to the complete minute volume, Babylog also calculates the expiratory minute volume uptake through
spontaneous breathing.
Babylog calculates the percentage by comparing the total minute volume and the minute volume uptake
through spontaneous breathing:
spont. = (MVspontaneous/MV) * 100%
The leakage at the tube can be estimated by comparing the inspiratory and the expiratory minute volume.
The leakage at the tube L is calculated as follows:
100.
The respiratory rate f is measured through the inspiratory respiratory phase cycles.
All measured values derived from the patient flow become valid only after successful calibration of the
flow sensor.
If the flow sensor or the measuring electronics fails, an alarm is generated. However, Babylog can still be
used without the functions depending on the flow measurement. This alarm status is shown in the status
field of the screen by the flashing indication "flow".
18
Dräger Medical AG & Co. KGaA
6173.3
_ _Printed on_18.05.05_F61733XXT01.fm
*
All rights reserved. Copyright reserved.
L= (MVinsp _ MVexp)/(MVinsp + MVexp)
Page 21
Function description
4
Babylog 8000
Monitoring Functions
The system checks whether limit values are kept and all functions are ok. If a function fails or if the limit
values are not met, Babylog will generate an alarm.
4.1
Fraction of inspired O2 (FiO2)
4.1.1
O2 Measurement
The measured O2 value is checked against upper and lower limit values. The alarm limits are
automatically set at ±4 vol.% below the set FiO2value. A time delay makes sure no alarm is activated
when the set value (O2) is changed or when the O2 sensor is calibrated.
The absolute sensor voltages are checked. The differential voltage between the two sensor cells must be
lower than (U1 + U2)/8 +1 mV. The output voltage of each individual cell must be between 9.5 mV and
123.6 mV.
4.1.2
O2 Calibration
The O2 sensor is either automatically calibrated 24 hours after the last calibration or manually after
selection from the mode menu.
If the O2 sensor is replaced during operation the new O2 sensor will be calibrated automatically. However,
Babylog cannot detect a sensor replacement if the unit is switched off. In this particular case, the operator
has to calibrate the new O2 sensor manually.
By switching over a valve the sensor is separated from the respiratory gas flow and purged with the
calibration gas (O2). This leads to a change in concentration at the O2 sensor. This change in
concentration allows the Babylog to recognize the activation of the calibration valve.
The calibration valve is deactivated as soon as the calibration is completed.
All rights reserved. Copyright reserved.
_ _Printed on_18.05.05_F61733XXT01.fm
A two-step calibration with 21% O2 and 100% O2 is carried out in order to achieve a higher measurement
accuracy over the whole concentration range and to be able to recognize a spent sensor cell.
During the calibration procedure the microprocessor system processes (synchronizes) one of the two O2
sensor channels. The O2 channels are then submitted to a specific sequence of states controlled by one
of the microprocessor systems and monitored for correct sequence and maximum period by the other. For
instance, searching of the calibration values for 21% or 100% must not last longer than 3.5 minutes each.
The calibration value for 21% must be between 9.2 mV and 26 mV, and for 100% between 43.6 mV and
123.6 mV; this applies to both channels. The zero voltage resulting from both values must be between
–6 mV and +6 mV.
After calibration is completed, the software checks whether the limit values respond correctly.
Calibration stops if a control gas fails.
Dräger Medical AG & Co. KGaA
6173.3
19
Page 22
Function description
4.2
Babylog 8000
Gas Supplies
The current measured values of the O2 and AIR gas supplies are considered when the valve bank is
adjusted. The inlet pressure for O2 and AIR is 1.7 bar.
If the pressure falls below the limit value, a visible and audible alarm is generated. The operator is
informed about the cause of the alarm by a plain text message on the display. If the adjusted O2
concentration is 21% or 100%, only an advisory message (no alarm) is displayed if the non-added gas
type fails.
If the pressure exceeds the limit value, the safety venting mechanism is activated and the continuous flow
is switched off. The Babylog will continue to operate only when the pressure has decreased to a
permissible level.
If the AIR supply fails, the Babylog control switches to O2 supply. If the O2 supply fails, Babylog switches
to AIR supply.
4.3
Airway Pressure Monitoring
Depending on the selected mode and parameter settings, a certain airway pressure time profile is set. If
the actual profile deviates from the set profile, the Babylog generates an alarm.
4.4
Disconnect Monitoring
Babylog recognizes whether or not the hose system has been connected correctly. If the hose system has
been connected incorrectly, the continuous flow is (partly) directed to atmosphere. No pressure builds up
in the hose system. Babylog checks during each breathing cycle whether a sufficiently high pressure is
available during inspiration. Since inspiratory breaths occur in the mandatory ventilation modes
IPPV/IMV, SIPPV and SIMV, this monitoring does not function in the CPAP mode.
Paw
Pinsp
Tdis
time
Zeit
Tdis > 25 ms !
Pdis = Pinsp - PEEP + PEEP
4
Fig. 4: Disconnect Monitoring
20
Dräger Medical AG & Co. KGaA
6173.3
_ _Printed on_18.05.05_F61733XXT01.fm
PEEP
All rights reserved. Copyright reserved.
Pdis
Page 23
Function description
Babylog 8000
During each mandatory breath, the level of the disconnection pressure (Pdis) must be exceeded without
interruption for at least the disconnection time (Tdis), otherwise an alarm will be generated. Pdis is a
function of the settings Pinsp and PEEP. If Pinsp is set considerably higher than the actually attained
pressure, the Pdis alarm level likewise increases.
Depending on the flow and the inspiration time settings, the level might not be attained any more.
Babylog 8000 generates an alarm even if there is no leakage in the breathing system.
4.5
Overpressure and Low Pressure Alarms
During the inspiratory and expiratory phases, the airway pressure (Paw) must not exceed the set pressure
limit by more than 10 mbar. If the set pressure limit is exceeded by 10 mbar to 20 mbar, Babylog
generates an alarm and, at the same time, reduces the inspiratory breath time. The remaining time is
added to the CPAP phase. If the set pressure limit is exceeded by more than 20 mbar, an alarm is
activated and the breathing system is vented.
In the CPAP phase, the airway pressure must be r4 mbar of the set PEEP/CPAP. Otherwise an alarm will
be generated. If the limit is exceeded by more than 10 mbar, venting is carried out as during the
inspiratory phase even if the pressure falls below the absolute level of —2 mbar.
These overpressure and low pressure alarms apply to all ventilation modes.
4.5.1
Babylog 8000 up to Software Version 3.0
Paw
Stenose 2 (Notentlüftung)
10 mbar
Stenose 1 (Inspiration
Exspiration)
10 mbar
Pinsp
Entlüftung
6 mbar
4 mbar
All rights reserved. Copyright reserved.
_ _Printed on_18.05.05_F61733XXT01.fm
PEEP
4 mbar
-2 mbar
Zeit
time
Fig. 5: Alarms
4.5.2
Dynamic Stenosis Limit
The dynamic stenosis limit applies to Babylog 8000 units with software version 4.0 and Babylog 8000 SC
Dräger Medical AG & Co. KGaA
6173.3
21
Page 24
Function description
Babylog 8000
units with software version 1.0.
The limit value is (Pinsp + 5 mbar).
If this limit value is exceeded, the microprocessor system reads in the actual measured value at 8.3-ms
intervals (sampling frequency). The limit value (Pinsp + 5 mbar) is subtracted from each of the actual
measured values and entered in a summer.
As soon as the sum of 40 mbar (stenosis 1) is reached, Babylog switches over from inspiratory phase to
expiratory phase. If a sum of 70 mbar is reached, despite of the safety measure (stenosis 1), the system
will carry out an emergency venting.
Paw
Σ = 40 mbar Stenose 1
Σ = 70 mbar Stenose 2
Pinsp + 5 mbar
Pinsp
PEEP
8,3
time
Zeit
8,3
8,3 ms
22
Dräger Medical AG & Co. KGaA
6173.3
_ _Printed on_18.05.05_F61733XXT01.fm
All rights reserved. Copyright reserved.
Fig. 6: Dynamic stenosis limit
Page 25
Function description
4.6
Babylog 8000
Minute Volume Monitoring (Babylog 8000/Babylog 8000 plus)
The abbreviation MV (for minute volume) is used in the following text.
4.6.1
Babylog 8000 with Software Versions 2 and 3
The monitoring menu is used to set the upper and lower alarm limits in the range of 0.03 L/min to
15 L/min. The upper and lower alarm limits are continuously compared with the measured MV value. If the
value exceeds the upper alarm limits or falls below the lower alarm limit, the system will activate an alarm.
Monitoring is deactivated during calibration of the flow sensor (Babylog 8000) to allow the measured MV
value to stabilize. If the flow measurement system fails, the MV monitoring becomes ineffective.
4.6.2
Babylog 8000 Software with Version 4.0 or Higher
The monitoring menu is used to set the upper and lower alarm limits in the range of 0.00 L/min to
15 L/min. The upper and lower alarm limits are continuously compared with the measured MV value. If the
value exceeds the upper alarm limits or falls below the lower alarm limit, the system will activate an alarm.
Monitoring is deactivated during calibration of the flow sensor (Babylog 8000) to allow the measured MV
value to stabilize. If the flow measurement system fails, the MV monitoring becomes ineffective.
4.6.3
Babylog 8000 plus
Babylog 8000 plus has the software 5.n.
4.7
Audible Alarm Generator Monitoring
Babylog has two audible alarm generators (loudspeaker and piezo). During normal operation, the
loudspeaker is the audio interface to the operator in the event of alarms. The piezo is only used in the
event of power or loudspeaker failure.
At the end of the self-test, the loudspeaker is triggered with a test signal. This test signal is monitored with
a microphone. If there is no feedback, Babylog generates error 817.
4.8
Operating Voltage Monitoring
All rights reserved. Copyright reserved.
_ _Printed on_18.05.05_F61733XXT01.fm
During operation, Babylog uses comparators to continuously monitors whether the operating voltages are
within specified limits.
When Babylog is switched on, these comparators are checked by a defined changing of the comparator
reference voltage.
4.9
Rotary Potentiometer Monitoring
Input via rotary potentiometers are processed by two channels. Two microprocessor systems read the
input via independent channels and compare the results.
Dräger Medical AG & Co. KGaA
6173.3
23