Dräger Medical Oxylog 3000 Guide

5503.403
9036041
Revision 4.0
Because you care
Technical Documentation
Oxylog 3000
Emergency and transport ventilator

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I
Contents
General
1Symbols and Definitions 1
2Notes 1
Function Description
1General introduction 5
1.1 Monitoring ............................................................................................................................... 5
1.2 Area of application .................................................................................................................. 5
2Principle of operation 5
3Pneumatic system 6
3.1 Inlet ......................................................................................................................................... 6
3.2 Metering ................................................................................................................................. 6
3.3 Sensors and safety functions ................................................................................................. 7
3.4 PEEP valve ............................................................................................................................ 8
3.5 Ambient pressure conditions .................................................................................................. 9
4Electronics 9
4.1 Charging circuit PCB .............................................................................................................. 9
4.2 Sensor PCB .......................................................................................................................... 10
4.3 Front membrane ................................................................................................................... 10
4.4 Control PCB ......................................................................................................................... 10

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Contents
Maintenance Procedures
1Replacing the filter element 13
2Replacing the internal battery 14
Schematics and Diagrams
1General introduction 17
Annex
Parts catalog
Test List
Technical Information

1
General

2

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1
Devicename General
1 Symbols and Defini-
tions
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 proce-
dures 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 manufac-
turer.
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.
WARNING
A WARNING statement provides important information about a poten-
tially 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 prop-
erty.
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

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2Folderno.
General Devicename
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 stan-
dards (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.

3
Function Description

4

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Oxylog 3000 Function Description
1 General introduction Oxylog 3000 is an emergency and transport ventilator for short-time treat-
ment of lung damage of a wide variety of kinds. It provides timed and volume-
controlled ventilation, as well as assisting the patient’s breathing in pressure-
controlled mode.
1.1 Monitoring – Airway pressure Paw
– Expiratory minute volume MV
– Apnoea
1.2 Area of application – Mobile use in emergency medicine or primary care of emergency
patients.
– In transit in emergency vehicles or helicopters.
– During transfers by road and air.
– In the emergency room.
– During secondary transfers from hospital to hospital.
2 Principle of opera-
tion
Oxylog 3000 primarily comprises the pneumatic components with the con-
nection and metering block and the control and display electronics (Figure 1).
The connection block supplies a constant pressure to the metering block,
contains the safety functions such as the emergency air and safety valves,
control the pressure (PEEP) during expiration and, together with the ventila-
tion accessories, provides the interface to the patient.
The metering block passes defined volumes of gas between 40% and 100%
oxygen to the connection block.
The control and display electronics evaluate the measurement signals, con-
trol the valves and provide the interface to the operator.

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Function Description Oxylog 3000
Figure 1 Principle of operation
3 Pneumatic system The following description relates to the pneumatic components diagram Oxy-
log 3000. The evaluation of the measurement signals from the sensors and
operation of the valves is handled on the control PCB.
3.1 Inlet The compressed oxygen passed through the filter F1 and the pressure regu-
lator DR to the valves V1 to V3. The pressure regulator regulates the pres-
sure to 3 bar. This is done to attain a stable flow control. The control PCB
monitors this pressure, which is measured with sensor S3.
3.2 Metering Valves V1 to V3 are proportional valves, each delivering a flow proportional to
the overall flow of 0 to 35 L/min. The flow sensor S1 measures the delivered
flow and the control PCB corrects the valve operation as necessary.
Valve V3 comprises two parallel configured valves, to produce a total flow
greater than 100 L/min.

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Oxylog 3000 Function Description
With the valve V1 and the ejector E1 ambient air can additionally be drawn in.
Valve V1 meters a flow through the ejector. The resultant negative pressure
draws ambient air through the filter F2, the flow sensor S2 and the non-return
valve V9.
Valve V2 adds oxygen to the ambient air depending on the pre-set O2 con-
centration. The flow sensor S2 measures the intake air flow and the control
PCB corrects valves V1 and V2 accordingly.
The proportion of ambient air may be a maximum of 75%. The minimum oxy-
gen concentration may thus be 40%.
At flows less than 9 L/min the volume of intake air is so low that an oxygen
concentration of 40% is no longer guaranteed. At flows greater than 35 L/min
oxygen is added accordingly. An oxygen concentration of 40% is no longer
guaranteed.
In a flow range from 9 to 35 L/min an oxygen concentration of 40% to 100%
can be set. The non-return valve V9 prevents oxygen escaping into the ambi-
ent air. L1 prevents swirling, and ensures a uniform oxygen concentration.
3.3 Sensors and safety
functions
The flow sensor S1 measures the inspiratory flow inside the unit and the con-
trol PCB corrects the operation of valves V1 to V3 as necessary based on the
measured value.
The safety valve SV opens at a pressure greater than 80 mbar, to prevent the
patient from being exposed to high pressure in the event of unit malfunctions.
The emergency breathing valve NV allows the patient to breathe spontane-
ously in case the unit fails.
The pressure sensor S4 measures the internal patient pressure inside the
unit and the PEEP pressure at the ventilation valve V10.
The pressure sensor S6 measures the differential pressure above the flow
sensor S8 located close to the patient (Figure 2). From it, the control PCB cal-
culates the flow.

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Function Description Oxylog 3000
Figure 2 Block diagram of external flow sensor
The pressure sensor S5 measures the pressure at the patient. Based on this
pressure value, the control PCB makes calculations including for actuation of
the PEEP valve V6.
Valves V7 and V8 switch the connections of S6, S5 against atmosphere at
cyclic intervals. The control PCB calibrates the sensors and any offset drift is
prevented.
3.4 PEEP valve The PEEP valve V6 controls the PEEP setting of the ventilation valve V10.
The control PCB actuates a coil which delivers a pressure to a diaphragm.
The internal tubing system vents to this pre-set PEEP pressure during expira-
tion.
This PEEP pressure also acts on a valve diaphragm in the ventilation valve
V10 (Figure 3/1). On expiration the pre-set PEEP pressure is established at
the patient.
During expiration an internal flow of 0.5 L/min flows through the PEEP valve
V6 to hold the diaphragm of the PEEP valve still and ensure uniform opening
of the PEEP valve.
During inspiration the PEEP valve V6 closes at 100 mbar.

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Oxylog 3000 Function Description
Figure 3 Ventilation valve
3.5 Ambient pressure
conditions
Oxylog 3000 meters the tidal volume under BTPS conditions. Sensors S7
and S9 measure the ambient pressure. S5 measures the current pressure
level in the lung. In this way the control PCB can balance fluctuating ambient
pressure and the BTPS conditions (Body Temperature, Pressure, Saturated.
Measurements referred to conditions of the patient’s lung, body temperature
37 °C, ambient pressure, water vapour saturated gas).
4 Electronics The following description relates to the electronics and represents only the
principle of operation. The connections of the individual modules are only
indicated indirectly, and are made by cable harnesses, connectors and the
conductors on the individual PCBs.
4.1 Charging circuit
PCB
The charging circuit PCB controls charging of the internal replaceable battery
and selection of the voltage supply (mains, on-board system or internal bat-
tery).
The charging circuit PCB accommodates the input for the external voltage
supply. The input is isolated from the remaining electronics by a protective
circuit.
The charging circuit PCB directly activates the power indicator LEDs. The
LEDs are located on the front membrane cover.
The charging circuit PCB has its own processor system, and thus its own
software. This software is also located on the control PCB, and is loaded from
there onto the charging circuit PCB.
The internal replaceable battery has various dummy resistors, depending on
the type used. The charging circuit PCB detects on the basis of the resistor
which type is fitted (nickel metal hydride or lithium ion).
The temperature and charge capacity of the internal replaceable battery is
determined by the battery itself. These data are transmitted from the charging
circuit PCB to the control PCB.

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Function Description Oxylog 3000
4.2 Sensor PCB The sensor PCB holds all the pressure sensors of the pneumatic system and
the internal temperature gauge. The sensor PCB is the interface for pressure
measurement and valve actuation between the pneumatic and electronic sys-
tems.
4.3 Front membrane On the front membrane cover are the keys, the LEDs and the turn knob.
Together with the monitor, the turn knob and the potentiometers, the front
membrane is the interface between the unit and the operator. The monitor is
an EL (Electro Luminescent) display.
4.4 Control PCB The control PCB holds the electronic On/Off circuit, the generator for the indi-
vidual internal operating voltages and the microprocessor system to control
and monitor ventilation.
The electronic On/Off circuit is operated directly by the unit’s On/Off button.
In case of a power failure while the unit is on, an alarm generator delivers an
acoustic signal. A Goldcap capacitor delivers the voltage for the signal.
The voltage generator generates the various operating voltages from the sup-
ply voltage, such as the +5 Volts for the microprocessor.
The microprocessor system comprises the microcontroller, an EEPROM, a
Flash-EPROM, a RAM and a real-time clock (RTC).
The EEPROM holds the calibration data, software options, ID number, unit
and service operating hours and the start-up conditions. The Flash-EPROM
holds the medical device software and the software for the charging circuit
PCB. The real-time clock generates the time and date. The real-time clock’s
RAM also holds the logs.
The microprocessor system evaluates the measurement signals from the
sensors, the settings of the potentiometers and the turn knob and operates
the valves and the display accordingly.
On a change of software the unit no longer needs to be opened. The infrared
interface transfers the data from the PC/laptop to the microcontroller and vice
versa.

11
Maintenance Procedures

12

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Oxylog 3000 Maintenance Procedures
1 Replacing the filter
element
1. Switch off the unit.
2. Remove screws Figure 1.
Figure 1 Removing the filter element
3. Remove the filter element.
4. Install the new filter element.
5. Carry out a unit test.
6. Place fully functional unit at the user’s/owner’s disposal.
NOTE
Note fitting position of filter element.

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Maintenance Procedures Oxylog 3000
2 Replacing the inter-
nal battery
1. Slacken the screw Figure 2/1 of the battery compartment cover anti-
clockwise until the cover can be opened.
2. Fold the cover Figure 2/2 down.
3. Pull the internal battery Figure 2/3 forward by its tab and withdraw it.
Figure 2 Removing the internal battery
4. Press the button on the new internal battery and check the charge.
The LEDs on the internal battery indicate the charge condition in percent.
5. Charge the internal battery as necessary.
6. Fit the internal battery.
7. Switch on the Oxylog 3000 and check the battery capacity indicated on
the display.
NOTE
The internal battery can be charged by the battery charger station or by the
external power supply in the Oxylog 3000.