Datex-Ohmeda S/5 M-EEG Technical Reference Manual Slot
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Datex-Ohmeda S/5 M-EEG Technical Reference Manual Slot

Datex-Ohmeda S/5 M-EEG Technical Reference Manual Slot

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Datex-Ohmeda
TM
S/5
EEG Module, M-EEG (rev. 01)
TM
S/5
EEG Headbox, N-EEG (rev. 01)
Technical Reference Manual Slot
All specifications are subject to change without notice.
Document No. 800 1011-1
June 2001
Datex-Ohmeda Inc.
Datex-Ohmeda Division,
3030 Ohmeda Drive
Instrumentarium Corp.
53707-7550 MADISON, WIS
P.O. Box 900, FIN-00031
USA
DATEX-OHMEDA, FINLAND
Tel. +1-608-221 1551,Fax +1-608-222 9147
Tel. +358 10 394 11 Fax +358 9 146 3310
www.us.datex-ohmeda.com
www.datex-ohmeda.com
 Instrumentarium Corp. All rights reserved.

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Summary of Contents for Datex-Ohmeda S/5 M-EEG

  • Page 1 EEG Module, M-EEG (rev. 01) EEG Headbox, N-EEG (rev. 01) Technical Reference Manual Slot All specifications are subject to change without notice. Document No. 800 1011-1 June 2001 Datex-Ohmeda Inc. Datex-Ohmeda Division, 3030 Ohmeda Drive Instrumentarium Corp. 53707-7550 MADISON, WIS P.O. Box 900, FIN-00031 DATEX-OHMEDA, FINLAND Tel.

  • Page 3: Table Of Contents

    Table of contents TABLE OF CONTENTS EEG Module, M-EEG and EEG Headbox, N-EEG TABLE OF CONTENTS TABLE OF FIGURES INTRODUCTION 1 SPECIFICATIONS 1.1 General specifications ..........................2 1.1.1 Headbox ............................2 1.1.2 Module ............................2 1.2 Technical specifications..........................2 1.2.1 EEG ..............................2 1.2.2 AEP..............................3 1.2.3 EMG ..............................3 1.2.4 Impedance measurement.........................3 2 FUNCTIONAL DESCRIPTION...

  • Page 4: Table Of Figures

    Datex-Ohmeda S/5 monitors 6.1.2 S/5 M-EEG rev. 01.........................23 6.1.3 N-EEG rev. 00 ..........................24 6.1.4 S/5 N-EEG rev. 01 .........................24 6.1.5 Front panel stickers ........................25 7 EARLIER REVISIONS APPENDIX A SERVICE CHECK FORM TABLE OF FIGURES Figure 1 Measurement setup ..........................1 Figure 2 Neuro board block diagram ........................

  • Page 5: Introduction

    This Technical Reference Manual Slot provides information for the maintenance and service of the Datex-Ohmeda S/5 EEG Module, M-EEG and Datex-Ohmeda S/5 EEG Headbox, N-EEG. The EEG module is a single width plug-in module designed for use with the S/5 monitors. Later in this manual modules can be called w/o system name S/5.

  • Page 6: Specifications

    Datex-Ohmeda S/5 monitors SPECIFICATIONS 1.1 General specifications 1.1.1 Headbox Box size, W × D × H 96 × 170 × 34 mm/3.8 × 6.7 × 1.3 in Box weight 0.5 kg/1.1 lbs Power consumption 1.9 W 1.1.2 Module Module size, W × D × H 37 ×...

  • Page 7: Aep

    S/5 EEG Module, M-EEG and S/5 Headbox, N-EEG 1.2.2 AEP Amplification 10 000 Resolution 60 nV Max amplitude 1000 µV Stimulation Click (condensating) duration 100 µs Frequency 1.1...9.1 Hz (1 Hz steps) @ 10 ms measurement 1.1...8.1 Hz (1 Hz steps) @ 100 ms measurement Intensity 10...90 dB nHL, 10 dB steps Measurement...

  • Page 8: Functional Description

    Datex-Ohmeda S/5 monitors FUNCTIONAL DESCRIPTION 2.1 Measurement principle 2.1.1 EEG EEG is differential voltage signal measured from electrodes attached to the patient’s skin. EEG measures the spontaneous electrical activity of the brain. This electrical activity reflects the state of the brain.

  • Page 9: Impedance Measurement

    S/5 EEG Module, M-EEG and S/5 Headbox, N-EEG of the brain. To overcome this the stimulus is repeated several times (100...2000), and average of all responses is calculated. Responses containing big artefacts are removed from the average to improve the signal to noise ratio. 2.1.4 Impedance measurement The impedance measurement is done from one channel at a time and the EEG or EP measurement is stopped during the impedance measurement.

  • Page 10: Headbox Board

    Datex-Ohmeda S/5 monitors Earphones Audio level adjustment Audio H83048 Headbox generator CTRL Timing control Figure 3 Audio stimulator circuitry 2.2.2 Headbox board The Headbox board consists of the following functional sections: input protection • EEG amplifiers and filters • FEMG amplifier and filter •...

  • Page 11: Connectors And Signals

    S/5 EEG Module, M-EEG and S/5 Headbox, N-EEG 2.3 Connectors and signals 2.3.1 Module bus connector Table 1 Module bus connector (X1) pin description Pin No. Signal RESET_RS485 -15 VDC +15 VDIRTY +15 VDC -DATA_RS485 DATA_RS485 Ground & Shield -RESET_RS485 CTSB RTSB RXDB...

  • Page 12: Module Front Panel Connectors

    Datex-Ohmeda S/5 monitors 2.3.2 Module front panel connectors Table 2 Headbox connector Pin No. Signal Ground Ground +15 V TXD+ EP Audio Power sync 43 kHz RXD+ EP Sync RXD- TXD- 2.3.3 Headbox input connector Table 3 Headbox input connector Pin No.

  • Page 13: Service Procedures

    Field service of the M-EEG and N-EEG is limited to replacing faulty circuit boards or mechanical parts. Faulty circuit boards should be returned to Datex-Ohmeda for repair. Datex-Ohmeda is always available for service advice. Please provide the unit serial number, full type designation, and a detailed description of the fault.

  • Page 14: Service Check

    Datex-Ohmeda S/5 monitors 3.2 Service check These instructions include complete procedures for a service check. The service check is recommended to be performed after any service repair. However, the service check procedures can also be used for determining possible failures.
  • Page 15 S/5 EEG Module, M-EEG and S/5 Headbox, N-EEG Check external parts of the headbox cover and the base of the headbox are intact − the headbox sticker is intact − connectors are intact and attached properly − Reattach the module box and the cover of the EEG headbox. •...
  • Page 16 Datex-Ohmeda S/5 monitors Enter the EEG module service menu: Parameters - More… - EEG & EP Check that the ‘Timeouts’, ‘Bad checksums’ and ‘Bad c-s by mod’ values in the module view are not increasing faster than by 50 per second. Check that the memories of the module have passed the internal memory test, i.e.
  • Page 17 S/5 EEG Module, M-EEG and S/5 Headbox, N-EEG 14. Plug in the earphones to the headbox. Be careful with load stimulation from the earphones EP Start/Stop when starting AEP stimulation. Start AEP stimulation by pressing the button on the module. Check that the clicking sound comes from the earphones in 1.1 Hz frequency. EP Start/Stop Stop the stimulation by pressing again the button on the module.

  • Page 18: Disassembly And Reassembly

    Datex-Ohmeda S/5 monitors 3.3 Disassembly and reassembly 3.3.1 M-EEG Disassemble the M-EEG in the following way. See Figure Exploded view of module box and EEG module Remove the two screws from the back of the module. Pull the module box slowly rearward and detach it from main body. Be careful with the loose latch and spring locking pin.

  • Page 19: Troubleshooting

    S/5 EEG Module, M-EEG and S/5 Headbox, N-EEG TROUBLESHOOTING 4.1 Troubleshooting chart Trouble Cause Treatment No EEG waveforms on screen. EEG waveforms not selected on screen. Press Monitor Setup key and select EEG waveforms on the screen. No EEG waveforms on screen and ‘EEG Electrodes not attached properly to skin or Check electrodes and electrode cables.

  • Page 20: Troubleshooting Flowcharts

    Datex-Ohmeda S/5 monitors 4.2 Troubleshooting flowcharts Possibly faulty EEG module. Take all m odules out of the fram e. Insert M -EEG and turn power on Does fault Fault not in EEG m odule still appear? Enter the EEG Service...

  • Page 21: Figure 6 Headbox Troubleshooting Flowchart

    S/5 EEG Module, M-EEG and S/5 Headbox, N-EEG Possibly faulty EEG headbox. Take all m odules out of the fram e. Insert M -EEG and EEG headbox and turn pow er D oes Fault not in EE G fault still headbox appear? Does the...

  • Page 22: Service Menu

    Datex-Ohmeda S/5 monitors SERVICE MENU Monitor Setup Press the key - select Install/Service (password: 16-4-34) - select Service (password: 26-23-8) - select Parameters - More... - EEG & EP. Document No. 800 1011-1...

  • Page 23: Eeg & Ep Service Menu

    S/5 EEG Module, M-EEG and S/5 Headbox, N-EEG 5.1 EEG & EP service menu EEG & EP Check Electr. Headbox measures impedance of electrodes. Works same way as from EEG menu or headbox/module button. Start AEP AEP measurement is started with current AEP settings. Module Service data is changed to module view (some of the data in this view is though from headbox).
  • Page 24 Datex-Ohmeda S/5 monitors HB Mod Timeouts is a cumulative number that indicates how many times the headbox has not responded to module’s inquiry. HB Mod Bad Checksum is a cumulative number that indicates how many times there has been an error in the message from headbox to module.
  • Page 25 S/5 EEG Module, M-EEG and S/5 Headbox, N-EEG BSR shows the burst-suppression classification of EEG waveforms. 0 means artifact, 1 suppression, 2 burst and 3 invalid (the EEG is not classified). Artefact shows the artefact status of all channels. 0 means that there are no artefacts on the signal and 1 means that there are artefatcs.
  • Page 26 Datex-Ohmeda S/5 monitors EEG Channels Number of active channels in EEG measurement. Montage Type Selection of bipolar (Bip)/referenced (Ref) montage. Cycle EP measurement repetition time. Stim. Frequency Ep measurement’s stimulation frequency. Stim. Intensity Intensity of EP stimulus. Document No. 800 1011-1...

  • Page 27: Spare Parts

    616215 Metal frame 879184 Front panel unit 896484 Cross cylinder head screw, M3×6 61721 Membrane keypad 880101 6.1.2 S/5 M-EEG rev. 01 Figure 7 Exploded view of module box and EEG module No new spare parts. Document No. 800 1011-1...

  • Page 28: N-Eeg Rev. 00

    Datex-Ohmeda S/5 monitors 6.1.3 N-EEG rev. 00 Item Description Order Item Description Order code code Headbox board 898805 Membrane keypad 880101 Module-headbox cable 895610 Cover 896457 Headbox input unit 896558 Base 896557 AEP connector 896461 Cross cylinder head screw, M3x6...

  • Page 29: S/5 N-Eeg Rev. 01

    S/5 EEG Module, M-EEG and S/5 Headbox, N-EEG 6.1.5 Front panel stickers Adaptation S/5 M-EEG (Rev. 01) S/5 N-EEG (Rev. 01) Electrode sticker 898693 898708 898207 898684 898699 897858 898683 898698 897858 898687 898702 898203 898690 898705 897858 898685 898700...

  • Page 30: Earlier Revisions

    Datex-Ohmeda S/5 monitors EARLIER REVISIONS Revision Manual slot/main manual Note M-EEG rev. 00 and N-EEG rev. 00 896622-1/896624 Document No. 800 1011-1...
  • Page 31 APPENDIX A, Service check form, S/5 M-EEG and N-EEG APPENDIX A Document No. 800 1011-1...
  • Page 32 Datex-Ohmeda S/5 monitors This page intentionally left blank. Document No. 800 1011-1...

  • Page 33: Service Check Form

    APPENDIX A, Service check form, S/5 M-EEG and N-EEG SERVICE CHECK FORM EEG Module, M-EEG and EEG Headbox, N-EEG Customer Service Module type Service engineer Date OK = Test OK N.A. = Test not applicable Fail = Test Failed N.A.
  • Page 34 Datex-Ohmeda S/5 monitors N.A. Fail N.A. Fail 14. AEP stimulation 15. AEP response Channel 1 35...45 µV Channel 2 35...45 µV 16. Electrical safety check 17. Functioning after electrical safety check 18. Final cleaning Notes Used Spare Parts Signature A-2(2)

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S/5 n-eeg

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