Technical Documentation
Oxylog 2000 plus
Emergency and Transport Ventilator
WARNING!
The proper servicing and testing of this device requires a full understanding of this Technical Documentation. Carefully read this Technical Documentation and any applicable Instructions for Use prior to any use of the device.
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Contents |
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Abbreviations |
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Explanation |
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General |
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Symbols and Definitions |
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Notes |
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Function Description |
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General |
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Functional principle |
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Pneumatic assembly |
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3.1 |
Inlet ....................................................................................................................................... |
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3.2 |
Restrictor .............................................................................................................................. |
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3.3 |
Sensors and safety functions ............................................................................................... |
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3.4 |
PEEP valve .......................................................................................................................... |
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3.5 |
Ambient pressure conditions ................................................................................................ |
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Electronics |
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4.1 |
Charging Circuit PCB ........................................................................................................... |
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4.2 |
Sensor PCB .......................................................................................................................... |
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4.3 |
Front membrane cover ......................................................................................................... |
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4.4 |
Control PCB ......................................................................................................................... |
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Maintenance Procedures |
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Replacing the replaceable battery |
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Replacing the filter element |
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Schematics and Diagrams |
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General |
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Annex
Parts Catalog
Test instructions
K5503320IECIVZ.fm 11.03.08 |
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Contents
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Abbreviations
This chapter contains a list of the abbreviations used in this manual.
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Abbreviations |
Oxylog 2000 plus |
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1Explanation
Abbreviation |
Explanation |
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BTPS |
English acronym for “Body Temperature, Pressure, Sat- |
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urated” (current conditions in the patient's lung, i.e. body |
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temperature 37 °C, ambient pressure, water-vapor satu- |
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rated gas). |
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DC |
English acronym for “Direct Current”. |
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EEPROM |
English acronym for “Electrically Erasable Programma- |
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ble Read-Only Memory”. |
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EL display |
Electroluminescence display. |
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EPROM |
English acronym for “Erasable Programmable Read- |
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Only Memory”. |
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LED |
English acronym for “Light Emitting Diode”. |
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MV |
English acronym for “Minute Volume”. |
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PC |
English acronym for “Personal Computer”. |
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PEEP |
English acronym for “Positive End Expiratory Pressure”. |
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RAM |
English acronym for “Random Access Memory”. |
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VC-CMV |
English acronym for the ventilation mode “Volume Con- |
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trol - Controlled Mandatory Ventilation”. |
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VC-SIMV |
English acronym for the ventilation mode “Volume Con- |
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trol - Synchronized Intermittent Mandatory Ventilation”. |
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VT |
English acronym for “Tidal Volume”. |
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General
This chapter contains general notes and definitions that are important for the use of this manual.
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General |
Oxylog 2000 plus |
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1Symbols and Definitions
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 or servicing of the equipment.
Definitions: |
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Inspection |
= examination of actual condition |
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Maintenance |
= measures to maintain specified condition |
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Repair |
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measures to restore specified condition |
Servicing |
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inspection, maintenance, and repair |
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Notes |
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.
CAUTION
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.
CAUTION
Dräger recommends that only Dräger supplied repair parts be used for maintenance. Otherwise the correct functioning of the device may be compromised.
The maintenance procedures described in this Technical Documentation may be performed by properly trained service personnel only. These maintenance procedures do not replace inspections and servicing by the manufacturer.
This Technical Documentation is for informational purposes only. Product information contained in this Technical Documentation does not supersede Product information provided in the Instructions for Use enclosed with the product at the time of delivery.
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.
NOTE
If the test values are not met, please contact your local service organization.
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Technical Documentation.fm |
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6.0 Printed on 05.03.08 General_ |
Function Description
This chapter contains descriptions of the device's technical functions.
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Function description |
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1 |
General |
The Oxylog 2000 plus is a time-cycled, volume controlled emergency and |
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transport ventilator with pressure support for patients requiring mandatory or |
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assisted ventilation with a tidal volume from 100 mL upwards. For use by and |
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under supervision of trained health care professionals. |
2Functional principle Oxylog 2000 plus primarily comprises the pneumatic components with the
connection and metering block and the control and display electronics (Fig. 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 ventilation accessories, provides the interface to the patient.
The metering block passes defined volumes of gas of approx. 40% or 100% oxygen to the connection block.
The control and display electronics evaluate the measurement signals, control the valves and provide the interface to the operator.
Fig. 1 Functional principle
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Oxylog 2000 plus |
Function description |
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3Pneumatic assembly The following description relates to the pneumatics diagram of the Oxylog
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2000 plus. The Control PCB evaluates the measurement signals of the sen- |
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sors and actuates the valves. |
3.1 |
Inlet |
The compressed oxygen passes through the filter F1 and the pressure regu- |
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lator DR to the valves V1 to V3. The pressure regulator regulates the pres- |
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sure to 3 bar. This is done to attain a stable flow control. The Control PCB |
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monitors this pressure, which is measured with sensor S3. |
3.2 |
Restrictor |
Valves V1 to V3 are proportional valves, each delivering a flow proportional to |
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the overall flow of 0 to 35 L/min. The flow sensor S1 measures the delivered |
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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.
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 selected O2 concentration (40 or 100%).
The proportion of ambient air may be a maximum of 75%. The minimum oxygen 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% or 100% can be set. The non-return valve V9 prevents oxygen escaping into the ambient air. L1 prevents swirling, and ensures a uniform oxygen concentration.
3.3Sensors and safety The flow sensor S1 measures the inspiratory flow inside the unit and the Con-
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trol PCB corrects the operation of valves V1 to V3 as necessary based on the |
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measured value. |
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The safety valve SV opens at a pressure greater than 80 mbar, to prevent the |
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patient from being exposed to high pressure in the event of unit malfunctions. |
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The emergency breathing valve NV allows the patient to breathe spontane- |
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ously in case the unit fails. |
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The pressure sensor S4 measures the internal patient pressure inside the |
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unit and the PEEP pressure at the ventilation valve V10. |
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The pressure sensor S6 measures the differential pressure above the flow |
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sensor S8 located close to the patient (Fig. 2). From it, the Control PCB cal- |
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culates the flow. |
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Function description |
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Fig. 2 Functional principle of the external flow sensor
3.4PEEP valve
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.
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 expiration.
This PEEP pressure also acts on a valve diaphragm in the ventilation valve V10 (Fig. 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 is closed by an actuation current of 130 mA.
reserved. |
Printed on 11.03.08 F5503403T01 Funktion.fm |
Copyright |
Revision 1.0_ |
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5503.320 |
Oxylog 2000 plus |
Function description |
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F5503403T01 Funktion.fm |
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Printed on 11.03.08 |
reserved. |
Revision 1.0_ |
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Fig. 3 Ventilation valve
3.5Ambient pressure Oxylog 2000 plus meters the tidal volume under BTPS conditions. Sensors
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conditions |
S7 and S9 measure the ambient pressure. S5 measures the current pressure |
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level in the lung. In this way the Control PCB can balance fluctuating ambient |
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pressure and the BTPS conditions (Body Temperature, Pressure, Saturated. |
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Measurements referred to conditions of the patient's lung, body temperature |
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37 °C, ambient pressure, water vapor saturated gas). |
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Electronics |
The following description relates to the Electronics block diagram and repre- |
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sents only the principle of operation. The connections of the individual mod- |
ules are only indicated indirectly, and are made by cable harnesses, connectors and the conductors on the individual PCBs.
4.1Charging 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 battery).
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 |
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4.2Sensor PCB
4.3Front membrane cover
4.4Control 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 systems.
On the front membrane cover are the keys, the LEDs and the rotary knob. Together with the display, the rotary knob and the potentiometers, the front membrane cover is the interface between the unit and the operator. The display is an EL display. EL stands for electroluminescent.
The Control PCB holds the electronic ON/OFF switch components, the voltage generation of the individual internal operating voltages, and the microprocessor system for control and monitoring of ventilation.
The electronic ON/OFF circuit is directly controlled (switched on or off) by the ON/OFF switch on the device.
If the device is ON and the power fails, an alarm generator generates an audible alarm signal. A Goldcap capacitor delivers the voltage for the signal.
The voltage generator generates the various operating voltages from the supply voltage. For example the +5 V 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 rotary 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.
reserved. |
Printed on 11.03.08 F5503403T01 Funktion.fm |
Copyright |
Revision 1.0_ |
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5503.320 |
Maintenance Procedures
This chapter describes the measures required to maintain the specified condition of the device.
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Maintenance procedures |
Oxylog 2000 plus |
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1Replacing the replaceable battery
1.Slacken the screw Fig. 1/1 of the battery compartment cover anti-clock- wise until the cover can be opened.
2.Fold the cover Fig. 1/2 down.
3.Pull the replaceable battery Fig. 1/3 forward by its tab and withdraw it.
Fig. 1 Removing the replaceable battery
4. Press the button on the new replaceable battery and check the charge.
The LEDs on the replaceable battery indicate the charge condition in percent.
5. Charge the replaceable battery as necessary.
NOTE
The replaceable battery can be charged by the battery charger station or by the external power supply in the Oxylog 2000 plus.
6.Fit the replaceable battery.
7.Switch on the Oxylog 2000 plus and check the battery capacity indicated on the display.
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Printed on 11.03.08 W5503403T06 Wechselakku.fm |
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5503.320 |
Oxylog 2000 plus |
Maintenance procedures |
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2Replacing the filter element
1.Switch off the device.
2.Remove screws Fig. 2.
Fig. 2 Removing the filter element
NOTE
Note fitting position of filter element.
3.Remove the filter element.
4.Install the new filter element.
5.Carry out a unit test.
6.Place the fully functional unit at the user's/owner's disposal.
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Printed on 05.03.08_ |
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Copyright |
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Maintenance procedures |
Oxylog 2000 plus |
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