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Asset Type
Extracorporeal Membrane Oxygenation (ECMO) System
Manufacturer
Model
What This Guide Helps With
Troubleshoots external ECMO gas-supply problems involving source gas, hoses, blender setup, oxygen connections, flow delivery, and associated accessories.
Step-by-Step Troubleshooting
1. Protect the Patient and Maintain Gas Exchange
A loss or uncertainty of sweep gas or oxygen supply can immediately affect ECMO gas exchange. Notify the ECMO clinical team and establish a verified alternate gas source or approved backup method before technical troubleshooting.
Do not interrupt gas delivery to a patient-connected oxygenator for equipment testing.
Expected outcome: Required ECMO gas delivery continues through a verified clinical pathway.
2. Confirm the Exact Gas-Supply Problem
Determine whether the complaint involves:
- No gas flow
- Low or unstable gas flow
- Oxygen source unavailable
- Blender not producing the expected setting
- Gas hose disconnected
- Supply pressure alarm elsewhere in the system
- A problem limited to one wall outlet, cylinder, hose, flowmeter, or blender
Document the setup and any alarms or indicators.
Expected outcome: The affected portion of the gas-delivery chain is clearly identified.
3. Verify the Source Gas Is Available
Check the intended oxygen and other required source-gas connections used by the ECMO setup.
Verify:
- Source is available
- Shutoff valves are appropriately positioned
- Cylinder, if used, is not empty
- Wall gas source appears functional
- The correct gas source is connected
Use approved hospital methods to verify medical gas infrastructure.
Expected outcome: Required source gas is present. If switching from a depleted or unavailable source to a verified source corrects the problem, proceed to final verification.
4. Inspect Gas Hoses and Connections
Trace the external gas path and inspect:
- Hose connections
- Quick-connect fittings
- Kinks
- Compression
- Visible damage
- Incorrect cross-connection
- Loose fittings
Do not use damaged medical gas hoses or improvised fittings.
Expected outcome: All hoses are correctly routed, intact, and securely connected.
5. Verify the Blender and Flow-Control Setup
Confirm the external gas blender, flowmeter, or related gas-control accessory is powered or supplied as applicable and that normal user controls are positioned appropriately.
Do not alter calibration or enter restricted service adjustments.
Expected outcome: The gas-control equipment receives the required source gases and provides an adjustable output.
6. Compare With a Known-Good Gas Source or Accessory
When safely possible, connect the setup to a verified alternate source or known-good compatible external gas-control component to determine whether the issue follows:
- The wall outlet
- The gas hose
- The blender or flow device
- Another accessory
Coordinate all patient-connected changes with the ECMO clinical team.
Expected outcome: The failing portion of the external gas-delivery chain is isolated.
7. Inspect the Sweep-Gas Path to the Oxygenator
On a non-patient test setup, or clinically when managed by the ECMO team, confirm the outlet gas tubing is connected, unobstructed, and routed correctly to the oxygenator gas inlet.
Expected outcome: Gas can pass through the intended external delivery pathway without kinking, disconnection, or obstruction.
8. Verify Output With Appropriate Test Equipment
Where Clinical Engineering is responsible for the gas-control accessory, use approved test equipment and manufacturer procedures to verify output performance.
Do not make undocumented calibration adjustments based solely on a clinical reading.
Expected outcome: The external gas blender or flow-control device produces appropriate controllable output under the approved test procedure.
9. Perform Final Functional Verification
Confirm:
- Source gas is reliable
- Gas hoses and connections are secure
- Blender or flow-control operation is stable
- Output responds appropriately to user controls
- Sweep-gas delivery path is intact
- Applicable alarms or indicators are functional
Expected outcome: The gas-delivery setup is stable and verified. Troubleshooting can stop.
10. Escalate an Unresolved Gas-Supply Problem
If the problem is traced to medical gas infrastructure, notify the appropriate facilities or medical-gas service team. If the blender or accessory fails verification, remove that component from service.
Expected outcome: An unreliable gas source or control device is not returned to patient use without qualified repair and verification.
If the Problem Persists
Common source-gas, hose, connection, blender setup, and sweep-path problems have been ruled out. Remaining causes may involve the medical gas infrastructure, gas-control accessory, regulator, configuration, or other service-level equipment.
The affected device or accessory should be:
- Removed from service when appropriate
- Labeled Out of Service
- Sent for repair or bench evaluation
- Evaluated using the appropriate manufacturer documentation and approved gas-analysis or flow test equipment
- Repaired or configured only by qualified personnel
Infrastructure problems should be escalated to the responsible hospital department. Complete appropriate gas-output and functional verification before returning the equipment to ECMO use.
Knowing when to stop external troubleshooting is proper troubleshooting.
Clinical Use Tip
Trace ECMO gas delivery from the source all the way to the oxygenator; a correct blender setting is meaningless if gas never reaches the circuit.
Work Order Documentation (CCR Method)
CCR = Complaint, Cause, Resolution
Complaint
What was reported by the clinical staff.
Example:
"ECMO staff reported no sweep-gas flow from the setup despite the external gas-control device being adjusted."
Cause
What was observed during troubleshooting.
Example:
"Clinical Engineering found the oxygen supply hose incompletely connected at the wall medical-gas outlet."
Resolution
What action was taken.
Example:
"Secured the medical-gas connection, verified stable gas delivery and controllable output through the setup, and released the equipment after functional verification."
Helpful Details to Include (If Known)
- Gas source being used
- Wall outlet or cylinder involved
- Source availability
- Hose and fitting condition
- Blender or flow-device settings observed
- Indicator or alarm behavior
- Known-good source or accessory comparison
- Sweep-gas tubing condition
- Approved output test result
- Infrastructure escalation if required
- Final device status
Final Thought
Protect gas exchange first, trace the external gas path logically from source to oxygenator, verify equipment performance rather than guessing, and escalate infrastructure or service-level failures promptly.
That is successful troubleshooting.