GE HealthCare ADU Plus Carestation
GE HealthCare · Model ADU Plus Carestation
Key Features Intuitive Datex-Ohmeda user interface shared across the anesthesia delivery unit, patient monitor, and anesthesia record keeper for a consistent user experience Integrated data management allows anesthesia delivery settings and patient monitoring data to be displayed on separate full-color screens, with an optional third display for the anesthesia record Network connectivity through the Datex-Ohmeda Anesthesia Monitor enables communication with other Carestations and integration with hospital information systems Modular hardware and software-driven architecture support future system upgrades and customization Lightweight, portable Aladin™ Cassettes can be stored and handled at any angle without tilt restrictions.
Key tips
- ·A failed daily leak test takes the machine out of service immediately - there is no acceptable workaround.
- ·Never run an agent-specific vaporizer with the wrong agent, even briefly, during testing.
- ·CO2-absorbent exhaustion mimics several unrelated fault symptoms - rule it out early.
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.
Fails the pre-use leak / machine check
HighSymptoms: Low-pressure or circle-system leak test fails, machine not ready for use.
Root cause: Breathing-circuit / absorber leak, a worn APL valve or bag arm, a CO2-absorber canister seal, or a vaporiser back-bar leak.
Ventilator / bellows or piston fault
HighSymptoms: Set tidal volume not delivered, bellows will not fill or hangs up, piston fault, PEEP not held.
Root cause: Bellows leak, a drive-gas valve fault, a flow-sensor fault, or a piston-seal fault.
O2 flowmeter / hypoxic-guard fault
MediumSymptoms: O2 flow not matching the setting, flowmeter float sticking, hypoxic-guard / ratio fault, no O2 flush.
Root cause: Worn flowmeter (rotameter), a hypoxic-guard link fault, or a flush-valve fault.
Vaporiser fault
MediumSymptoms: Agent output does not match the dial, back-bar leak, dial stiff.
Root cause: Vaporiser seating / O-ring, or an internal vaporiser fault (calibrate at an authorised centre).
Gas-supply / pipeline / O2-failure alarm
MediumSymptoms: O2-failure whistle / alarm, anti-hypoxia device cuts N2O, pipeline-pressure fault.
Root cause: Loss of pipeline / cylinder pressure, or a pressure-sensor fault.
Scavenging (AGSS) fault
LowSymptoms: Waste-gas scavenging alarm or not evacuating, theatre pollution.
Root cause: Scavenging flow / connection or a receiver-valve fault.
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.
APL valve / breathing-system gaskets & seals
Class Periodic replacementRel. cost $$R&R Fairly easy
CO2 absorbent / canister seals
Class ConsumableRel. cost $R&R Easy
Ventilator bellows / piston seal
Class Major service partRel. cost $$$R&R Difficult
Flow sensor(s)
Class Frequent wear itemRel. cost $$R&R Fairly easy
O2 flowmeter (rotameter)
Class Major service partRel. cost $$R&R Moderate
Vaporiser O-ring / back-bar seal
Class Periodic replacementRel. cost $R&R Fairly easy
| Part | Service class | Relative cost | R&R difficulty |
|---|---|---|---|
| APL valve / breathing-system gaskets & seals | Periodic replacement | $$ | Fairly easy |
| CO2 absorbent / canister seals | Consumable | $ | Easy |
| Ventilator bellows / piston seal | Major service part | $$$ | Difficult |
| Flow sensor(s) | Frequent wear item | $$ | Fairly easy |
| O2 flowmeter (rotameter) | Major service part | $$ | Moderate |
| Vaporiser O-ring / back-bar seal | Periodic replacement | $ | 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.
- ·Daily pre-anesthesia machine check: leak test, O2 sensor calibration, per facility protocol
- ·Scheduled vaporizer calibration and agent-specific service
- ·Absorber / CO2 canister replacement
- ·Breathing circuit and hose inspection
- ·Annual full PM and electrical safety test
Error Codes
Extracted directly from this unit's own service manual.
Pmax Release (AUTO)Limit alarm message
Ppeak High (AUTO)Limit alarm message
Ppeak High (MAN)Limit alarm message
Ppeak Low (AUTO)Limit alarm message
PEEP High (AUTO)Limit alarm message
PEEP High (MAN)Limit alarm message
Negative Pressure (AUTO) excluding (SIMVLimit alarm message
Negative Pressure (MAN), (SIMV)Limit alarm message
Oxygen failure alarmIn case the O2 supply to the machine is interrupted, the oxygen failure alarm is activated. The alarm limit pressure is 250 kPa (36.2 psi). If lack of supply pressure stops the O2 flow, the flow of N2 O is automatically cut off. The alarm may be silenced momentarily but returns after 2 minutes.
PEEP High (AUTO) PEEP+5Limit alarm message
PEEP High (MAN) 10Limit alarm message
O2 supply lostAuditory alarm that cannot be disabled
Ventilator failureAuditory alarm that cannot be disabled
Batteries empty. Go manualAuditory alarm that cannot be disabled
Hypoxic mixtureAuditory alarm that cannot be disabled
Fresh gas occlusionAuditory alarm that cannot be disabled
Fresh gas unit failureAuditory alarm that cannot be disabled
Volume monitor removedDisplayed in French Version if no volume monitor is connected or it is switched off
Agent % setting highDisplayed in Japanese version if sevoflurane anesthetic agent is set above 5 %
Ppeak lowAdvanced to HIGH priority after 120 s in Japanese version
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: Fails the pre-use leak / machine self-test
- Run the check with the exact breathing circuit, absorber and vaporisers that will be used.
- Reseat the CO2-absorber canister and check its seal; replace exhausted absorbent.
- Inspect the breathing-system gaskets, the bag arm and the APL valve.
- Confirm each vaporiser is seated / Selectatec-latched with an intact back-bar O-ring.
- Re-run the test; escalate an internal low-pressure leak that cannot be localised.
Symptom: Ventilator not delivering the set tidal volume / bellows or piston fault
- Verify tidal volume with a calibrated gas-flow analyser.
- Inspect the bellows (or piston seal) for a leak and the drive-gas valve.
- Calibrate the flow sensors.
- Check circuit-compliance compensation is enabled and the circuit is intact.
- Replace the bellows / flow sensors as isolated and re-verify.
Symptom: O2 flow wrong / hypoxic-guard fault / no O2 flush
- Verify O2 flow with a calibrated flow meter.
- Tap a sticking flowmeter float; replace the rotameter tube if it sticks.
- Check the hypoxic-guard link maintains the minimum O2:N2O ratio.
- Confirm the O2-failure alarm sounds when O2 pressure is removed.
- Refer the flowmeter block / hypoxic guard for service.
Symptom: Agent concentration wrong / vaporiser back-bar leak
- Verify output with a calibrated agent analyser across the dial range.
- Confirm the correct agent is filled.
- Reseat the vaporiser and replace the back-bar O-rings.
- Repeat the machine leak test.
- Send the vaporiser to an authorised service centre for recalibration if output is out of spec.
Technical Specs
- Height
- 66.7 in
- Gases
- Air, Nitrous Oxide, Oxygen
- Length
- 30.7 in
- Vaporizers (Max)
- One
- Weight
- 286 lbs
- Vaporizer Type
- Electronic control
- Vent Modes
- Pressure Control (PCV), Volume Control (VCV); and spontaneous ventilation modes: Pressure Support (PSV), Synchronized Intermittent Mandatory Ventilation (SIMV)
- Width
- 33.1 in
Typical Location
Where this class of equipment is typically deployed - general reference, not this unit's own placement record.
- Operating rooms
- Procedure / endoscopy suites requiring sedation
- Obstetric delivery rooms
Documents & Manuals
Safety & Recalls
Synced live from the FDA openFDA API.
- RECALL
Potential failure of the caster mounting hardware, which may result in the ventilator falling/tipping (overbalancing).
- RECALL
GE Healthcare has received reports of breathing circuit or tubing misconnections of the Anesthesia Delivery Unit (ADU), that may impact patient safety.
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