Oxylog 3000 Technical Documentation Rev 4.0

Contents General 1

Symbols and Definitions

1

2

Notes

1

Function Description 1

5

1.1

Monitoring ... 5

1.2

Area of application ... 5

2

Principle of operation

5

3

Pneumatic 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

Electronics

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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General introduction

I

Contents Maintenance Procedures 1

Replacing the filter element

13

2

Replacing the internal battery

14

Schematics and Diagrams 1

General introduction

17

Annex Parts catalog Test List Technical Information

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II

General

1

Devicename 1

Symbols and Definitions

General

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.

Definitions according to German standard DIN 31051:

2

Notes

Inspection

= examination of actual condition

Maintenance

= measures to maintain specified condition

Repair

= measures to restore specified condition

Servicing

= inspection, maintenance, and repair

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.

The maintenance procedures described in this Technical Documentation may be performed by qualified service personnel only. These maintenance procedures 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 manufacturer. All rights reserved. Copyright reserved.

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It is our recommendation to use only Dräger parts and supplies.

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.

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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.

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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.

Function Description

3

Oxylog 3000

Function Description

1

General introduction

Oxylog 3000 is an emergency and transport ventilator for short-time treatment of lung damage of a wide variety of kinds. It provides timed and volumecontrolled ventilation, as well as assisting the patient’s breathing in pressurecontrolled mode.

1.1

Monitoring

–

Airway pressure Paw

–

Expiratory minute volume MV

–

Apnoea

–

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.

1.2

2

Area of application

Principle of operation

Oxylog 3000 primarily comprises the pneumatic components with the connection 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 ventilation accessories, provides the interface to the patient. The metering block passes defined volumes of gas between 40% and 100% oxygen to the connection block.

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The control and display electronics evaluate the measurement signals, control the valves and provide the interface to the operator.

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Function Description

Oxylog 3000

3

Pneumatic system

The following description relates to the pneumatic components diagram Oxylog 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 regulator DR to the valves V1 to V3. The pressure regulator regulates the pressure 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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Principle of operation

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Figure 1

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 concentration. 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 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% to 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.

3.3

Sensors and safety functions

The flow sensor S1 measures the inspiratory flow inside the unit and the control 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 spontaneously 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.

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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 calculates 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 expiration.

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.

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During inspiration the PEEP valve V6 closes at 100 mbar.

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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.

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 battery).

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.

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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 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 systems.

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 individual 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 supply 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.

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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.

Maintenance Procedures

11

Oxylog 3000 1

Replacing the filter element

Maintenance Procedures 1. Switch off the unit. 2. Remove screws Figure 1.

Figure 1

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.

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6. Place fully functional unit at the user’s/owner’s disposal.

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Maintenance Procedures 2

Replacing the internal battery

Oxylog 3000 1. Slacken the screw Figure 2/1 of the battery compartment cover anticlockwise 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. NOTE The internal battery can be charged by the battery charger station or by the external power supply in the Oxylog 3000.

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7. Switch on the Oxylog 3000 and check the battery capacity indicated on the display.

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6. Fit the internal battery.

Schematics and Diagrams

15

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General introduction

This section presents the diagrams and overviews of the Oxylog 3000, such as the pneumatic components diagram and the block diagram of the electronics. In some cases the diagrams and overviews are also used as references to describe functions.

1

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Oxylog 3000

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Schematics and Diagrams

17

18

General overview, for legend see Table 1

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Figure 1

Schematics and Diagrams Oxylog 3000

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Signal generator

Loudspeaker

Display

Control PCB (see also Figure 6)

Cover panel for pneumatic components

Pneumatic components and sensor PCB (see also Figure 3)

Handle

Filter element to filter the ambient air intake

Charging circuit PCB

Rear panel

Battery compartment cover

Replaceable battery

DC voltage socket

Sockets for flowmeter tubes, ventilation tube and compressed gas tube

Base plate

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

Designation

Front section with potentiometer, rotary encoder, membrane keypad and label inserts

Legend Figure 1

1

Item

Table 1

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Oxylog 3000 Schematics and Diagrams

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