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What This Guide Helps With
Helps isolate blocked tubing, incorrect scavenging connections, facility suction problems, or accessory restrictions that can impair waste-gas removal or create excessive negative pressure.
Step-by-Step Troubleshooting
1. Protect the Patient and Breathing System
If scavenging performance appears to affect ventilation, airway pressure, reservoir behavior, or breathing-system function, discontinue use and move the patient to another verified anesthesia system.
Expected outcome: Patient ventilation and anesthetic delivery are no longer exposed to an unreliable scavenging condition.
2. Confirm the Exact Scavenging Problem
Determine whether staff observed poor scavenging, bag collapse, abnormal breathing-system pressure, excessive suction, odor, visible tubing collapse, or another specific symptom.
Reproduce the issue only using an appropriate non-patient test setup.
Expected outcome: The scavenging complaint is confirmed and its effect on the breathing system is understood.
3. Inspect Scavenging Tubing
Trace the external scavenging path from the anesthesia machine to the facility or disposal interface.
Check for:
- Kinks
- Crushed tubing
- Occlusion
- Disconnection
- Improper routing
- Fluid accumulation
- Damaged connectors
Expected outcome: Scavenging tubing is open, correctly routed, and securely connected. If correcting the tubing resolves the problem, proceed to final verification.
4. Verify the Facility Scavenging Connection
Confirm the machine is connected to the correct waste-anesthetic-gas disposal interface and not to an inappropriate suction source or incompatible connection.
Expected outcome: The external facility connection is correct for the intended system.
5. Check for Excessive External Suction
Evaluate whether excessive suction or an inappropriate facility setting is pulling abnormally on the anesthesia scavenging system.
Coordinate with facilities or the appropriate infrastructure team if the building system is suspect.
Expected outcome: The external scavenging source operates within the intended system configuration and does not create abnormal negative pressure at the anesthesia machine.
6. Inspect Accessible Scavenging Components
Inspect externally accessible scavenging reservoir components, hoses, connectors, and interfaces for obstruction, damage, or incorrect assembly.
Do not perform deep disassembly of internal scavenging hardware.
Expected outcome: Accessible components are correctly assembled and unobstructed.
7. Compare With Another Verified Outlet or Setup
When permitted, compare operation using another verified scavenging connection or known-good external hose assembly.
Expected outcome: If the problem follows the room connection, infrastructure is implicated. If it remains with the machine, the fault is narrowed to the machine or its external scavenging components.
8. Verify Breathing-System Behavior
Using a test lung and appropriate analyzer, confirm that scavenging operation does not cause abnormal breathing-system pressure, reservoir collapse, or ventilator interference.
Expected outcome: Scavenging removes waste gas without disrupting ventilation or pressure control.
9. Perform Final Functional Verification
After correction, complete the applicable anesthesia-machine checkout and confirm normal ventilation, pressure behavior, scavenging function, and absence of abnormal suction effects.
Expected outcome: The scavenging system functions normally and does not affect breathing-system performance. If so, troubleshooting is complete.
10. Escalate if the Problem Remains
If tubing, connections, facility interface, and accessible scavenging components are correct but abnormal scavenging persists, remove the machine from service.
Expected outcome: Further machine-level or infrastructure-level evaluation is assigned appropriately.
If the Problem Persists
Common external tubing, facility connection, routing, and suction-source causes have been ruled out. Remaining possibilities may involve an internal scavenging valve, reservoir mechanism, interface fault, or facility disposal-system problem.
The device should be:
- Removed from service
- Labeled Out of Service
- Sent for repair or bench evaluation when the machine is implicated
- Evaluated using appropriate manufacturer documentation and approved test equipment
- Repaired or configured only by qualified personnel
If the facility system is implicated, escalate to the appropriate facilities or medical-gas service team before returning the location to use.
Clinical Use Tip
A scavenging problem is not only an environmental concern; excessive suction can affect breathing-system pressure and therefore requires immediate clinical attention.
Work Order Documentation (CCR Method)
CCR = Complaint, Cause, Resolution
Complaint
What was reported by the clinical staff.
Example:
"Anesthesia staff reported the reservoir bag was being pulled down and excessive scavenging suction was suspected."
Cause
What was observed during troubleshooting.
Example:
"Clinical Engineering found the scavenging hose connected to an incorrect external suction source."
Resolution
What action was taken.
Example:
"The hose was connected to the appropriate scavenging interface and normal breathing-system pressure and scavenging performance were verified."
Helpful Details to Include (If Known)
- Reported scavenging symptom
- Room or OR location
- Scavenging hose condition
- Facility connection used
- Alternative outlet comparison
- Reservoir behavior
- Pressure behavior
- Test-lung result
- Facilities involvement
- Final device status
- Reported scavenging symptom
- Room or OR location
- Scavenging hose condition
- Facility connection used
- Alternative outlet comparison
- Reservoir behavior
- Pressure behavior
- Test-lung result
- Facilities involvement
- Final device status
Final Thought
Scavenging faults should be traced from the machine outward through tubing and facility infrastructure before assuming an internal problem. Protect ventilation first, verify the entire disposal path, and escalate machine or infrastructure faults to the appropriate qualified team.
That is successful troubleshooting.