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What This Guide Helps With
This guide addresses situations where the Carestation 600 Series anesthesia machine triggers:
- Oxygen (O₂) supply or pressure alarms
- Nitrous oxide (N₂O) or medical air supply alarms
- Fluctuating or low gas delivery to the patient
- Failure to reach the set gas concentrations
Focus is on external, verifiable causes first—such as supply lines, cylinders, pipeline pressures, and connectors—before assuming internal valve or sensor failure.
Step-by-Step Troubleshooting
Verify Patient Safety First
- Ensure the patient is on an alternate oxygen source or ventilator if the machine is actively in use.
- Do not troubleshoot the gas supply while the patient is dependent on this machine.
Check Cylinder Supply
- Ensure O₂, N₂O, and air cylinders are present, properly secured, and at adequate pressure.
- Verify cylinder regulators are open and functioning.
- Look for low-pressure or empty cylinder indications on the front panel.
Check Pipeline Gas Connections
- Confirm pipeline hoses are properly connected to the wall outlets.
- Verify the correct gas is connected to each inlet (O₂, N₂O, Air).
- Inspect for kinks, leaks, or loose fittings in the supply hoses.
Verify Pipeline Pressure
- Check the machine’s pressure gauges for O₂, Air, and N₂O.
- Normal pipeline pressures: O₂ ~50 psi, Air ~50 psi, N₂O ~50 psi (confirm with local hospital standards).
- If pressure is low, check with the central supply department; the pipeline may be offline.
Check Flowmeters and Vaporizers
- Ensure vaporizers are seated correctly and the interlock system is engaged.
- Confirm that flow control knobs are functioning and not jammed.
Inspect Alarm and System Messages
- Note the exact alarm message (e.g., “O₂ Low Pressure,” “Pipeline Fail,” “O₂ Supply Failure”).
- Some alarms may clear if the correct supply source is selected.
Swap External Hoses or Cylinders if Available
- If you have a spare hose or cylinder, swap it to rule out external defects.
If the Problem Persists
External supply sources and connections have been verified. Internal gas valves, regulators, or sensors may be malfunctioning.
- Remove the machine from service.
- Label Out of Service.
- Send for service by qualified Biomedical Engineering personnel or GE-certified service.
- Proper troubleshooting includes knowing when to escalate to prevent patient risk.
Clinical Use Tip
- Never troubleshoot oxygen or gas supply alarms with a patient connected to the machine.
- Move the patient to a backup anesthesia machine or ventilator first.
- Document all actions to ensure traceability and patient safety.
Work Order Documentation (CCR Method)
CCR = Complaint, Cause, Resolution
Complaint
What was reported by the clinical staff.
Example:
“O₂ supply alarm sounding during case, unable to maintain set O₂ concentration.”
Cause
What was observed during troubleshooting.
Example:
“Pipeline O₂ pressure low; cylinder pressures adequate; no kinks in hoses; supply connections verified.”
Resolution
What action was taken.
Example:
“Machine removed from service, labeled Out of Service, notified GE service for bench evaluation. Patient transferred to backup anesthesia machine.”
Helpful Details to Include
- Pipeline and cylinder pressures at time of alarm
- Alarm type and frequency
- Visual inspection of hoses, regulators, and fittings
- Vaporizers in use and interlock status
- Patient safety measures taken
Final Thought
Patient safety is the highest priority. Systematic, external checks save time and reduce risk. Knowing when to escalate to service ensures safe operation and proper equipment maintenance. Accurate CCR documentation protects both staff and patients.
That is successful troubleshooting.