Nihon Kohden Prefense EDNS-9001
Nihon Kohden · Model Prefense EDNS-9001
16, 24, 32 or 40-Patient Prefense System configurations. Wireless EtCO2 option. Automatic data integration to your electronic charting system using the CGS-9002 HL7. Gateway System. All data stored for 72 hours. Event recall-all detected alarm events. Graphical trends. Vital signs list.
Key tips
- ·A no-signal/flatline alarm gets checked on the patient first, not the monitor - rule out a real clinical event before troubleshooting.
- ·Recalibrate NIBP against a reference manometer, not just a self-test pass.
- ·Reused patient cables (SpO2, ECG leads) are a common source of intermittent-fault complaints - swap the cable before the module.
Typical Failure Modes
Compiled for this model from its own documentation and established engineering knowledge for this equipment class - not from a verified service record. Confirm against the manufacturer's service manual.
One or more telemetry transmitters drop / no waveform
HighSymptoms: A bed shows no ECG or dropped beats at the central station, noisy trace, frequent leads-off.
Root cause: Worn transmitter lead set, a weak transmitter battery, or antenna / receiver coverage.
Antenna / RF coverage fault
MediumSymptoms: Dropout in specific areas of the unit, multiple beds affected in one zone.
Root cause: Antenna cabling, a splitter / amplifier, or a receiver-module fault.
Central-station application / server fault
HighSymptoms: Central station hangs, will not admit, alarms not annunciating, display frozen.
Root cause: Central-station PC / server, the application, or the network link.
Printer / recorder fault
LowSymptoms: No strip on alarm or on demand.
Root cause: Central recorder / network printer fault.
Time / network sync fault
LowSymptoms: Timestamps wrong or drifting, full-disclosure gaps.
Root cause: Network time source or connectivity.
Serviceable Parts & Consumables
Serviceable items for this model, compiled from its documentation and engineering knowledge for this equipment class. Service class and relative cost are estimates, not manufacturer figures; no part numbers are given. Confirm intervals and pricing against the manufacturer.
Telemetry transmitter lead set
Class Frequent wear itemRel. cost $$R&R Easy
Transmitter battery (per pack)
Class ConsumableRel. cost $R&R Easy
Receiver module / antenna components
Class Major service partRel. cost $$$R&R Difficult
Central-station PC / server
Class Major service partRel. cost $$$$R&R Difficult
Network printer / recorder
Class Major service partRel. cost $$R&R Fairly easy
| Part | Service class | Relative cost | R&R difficulty |
|---|---|---|---|
| Telemetry transmitter lead set | Frequent wear item | $$ | Easy |
| Transmitter battery (per pack) | Consumable | $ | Easy |
| Receiver module / antenna components | Major service part | $$$ | Difficult |
| Central-station PC / server | Major service part | $$$$ | Difficult |
| Network printer / recorder | Major service part | $$ | Fairly easy |
Relative cost: $ lowest · $$$$ highest service-part cost for this equipment class. Not a price.
PM Checklist
Preventive-maintenance tasks typical of this equipment class. Perform to the manufacturer's procedure and your facility's policy - this is general reference, not a schedule for this specific unit.
- ·Routine cable and lead-wire inspection for fraying/wear
- ·Battery conditioning cycle
- ·NIBP calibration check against a reference manometer
- ·ECG / SpO2 accuracy verification against a patient simulator
- ·Annual electrical safety test
Troubleshooting Approach
A starting sequence for this model, compiled from its documentation and engineering knowledge for this equipment class. Follow the manufacturer's service documentation for the actual procedure.
Symptom: A parameter drops out or reads wrong (ECG / IBP / SpO2 / temp / CO2 / CO)
- Reseat the patient cable at the module and at the monitor.
- Swap in a known-good cable / sensor for that parameter and re-test.
- Move the module to another host or slot to tell module from host.
- Inspect the module docking connector for bent or recessed pins.
- Verify against a patient simulator; replace the cable, or refer the parameter module / input board if the fault stays with it.
Symptom: NIBP will not measure or is inaccurate
- Leak-test the cuff and hose (occlude and watch for pressure decay).
- Run the monitor's NIBP calibration-verification against a calibrated manometer.
- Confirm correct cuff size and placement and check for a kinked hose.
- Verify against a NIBP simulator at several pressures.
- Refer the monitor for internal pump / valve service if it still fails.
Symptom: Blank / dim / frozen display or unresponsive touchscreen
- Power-cycle the monitor fully (mains removed, battery out where possible).
- Check the display backlight and the display / touchscreen cable.
- Note any boot or self-test error code.
- Re-calibrate the touchscreen if the touch offset is the issue.
- Replace the display / touchscreen assembly or refer the main board.
Symptom: Not shown at the central station / network dropout
- Confirm the wired drop or Wi-Fi settings and that other monitors on that segment are online.
- Check the monitor's network address / unit-bed assignment and re-admit.
- Reseat the network card / cable.
- Restart the monitor's network interface.
- Escalate a whole-unit outage to the central-station server / IT.
Typical Location
Where this class of equipment is typically deployed - general reference, not this unit's own placement record.
- ICU / CCU
- Emergency Department
- OR / PACU
- General med-surg floors
- Step-down units
- Telemetry units
Documents & Manuals
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