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What This Guide Helps With
Addresses absorber locking, sealing, or bypass problems caused by incorrect installation, damaged seals, canister condition, contamination, or mechanical obstruction.
Step-by-Step Troubleshooting
1. Protect the Patient and Maintain a Safe Breathing System
Do not troubleshoot an absorber that cannot be securely installed or sealed while a patient depends on the machine. Move the patient to another verified anesthesia system.
Expected outcome: Patient ventilation and CO2 management continue safely on another system.
2. Confirm the Exact Absorber Problem
Determine whether the canister will not insert, will not rotate or lock, appears locked but leaks, or does not correctly enter or leave bypass when operated normally.
Record whether the issue began after absorbent replacement, cleaning, or canister exchange.
Expected outcome: The mechanical or sealing problem is clearly identified.
3. Remove and Inspect the Canister
Remove the canister using its normal operating method. Inspect the exterior for cracks, distortion, loose components, overfilled absorbent, contamination, or foreign material around the interface.
Do not force a canister that binds.
Expected outcome: The canister is structurally intact and free of external obstruction.
4. Verify Correct Absorbent Loading
Confirm absorbent is loaded according to the approved configuration and is not interfering with closure or canister seating.
Check that no absorbent granules or packaging material are trapped on the sealing surface.
Expected outcome: The canister is correctly filled and its sealing surfaces are clear.
5. Inspect Accessible Seals and Mating Surfaces
Inspect visible gaskets, O-rings, sealing surfaces, and the canister receiver for contamination, displacement, wear, or obvious damage.
Do not use unapproved lubricants or attempt to reshape damaged seals.
Expected outcome: Sealing surfaces are clean, correctly positioned, and undamaged.
6. Reinstall the Canister Without Force
Reinsert and lock the absorber using its normal mechanism. Confirm the canister seats fully and the locking mechanism reaches its expected position without excessive force.
Expected outcome: The absorber locks securely. If it now seats correctly, continue to leak and bypass verification.
7. Compare With a Known-Good Canister
If available, install a known-good compatible absorber canister.
If the known-good canister locks and seals correctly, remove the suspect canister from service.
Expected outcome: The comparison identifies whether the problem is canister-specific or machine-side.
8. Verify Seal and Bypass Function
Perform the normal system or leak test and confirm that the absorber configuration does not create an abnormal breathing-system leak.
Verify bypass operation only through standard user-accessible controls and indications; do not defeat or manually manipulate internal interlocks.
Expected outcome: The canister seals correctly and the machine recognizes or responds to the intended absorber configuration normally.
9. Perform Final Breathing-System Verification
Using a test lung and approved anesthesia analyzer, verify ventilation, circuit pressure, CO2-related gas-path behavior as applicable, and alarms.
Expected outcome: The breathing system passes its required tests and operates normally. Troubleshooting can stop.
10. Escalate Persistent Locking or Sealing Problems
If a known-good canister will not properly lock, seal, or function in bypass, remove the machine from service.
Expected outcome: The absorber receiver, locking mechanism, bypass mechanism, or related internal components are referred for qualified service evaluation.
If the Problem Persists
External causes such as canister damage, incorrect filling, trapped absorbent, contamination, seal displacement, and improper installation have been ruled out. Persistent failure may involve the absorber receiver, locking mechanism, bypass mechanism, or internal breathing-system components.
The device should be:
- Removed from service.
- Labeled Out of Service.
- Sent for repair or bench evaluation.
- Evaluated using appropriate Drager service documentation and approved test equipment.
- Repaired only by qualified personnel.
- Subjected to complete leak, breathing-system, ventilation, and system-test verification before return to service.
Forcing an absorber canister or bypass mechanism is not acceptable troubleshooting.
Clinical Use Tip
An absorber that does not positively lock and seal should be treated as a breathing-system integrity problem until proven otherwise.
Work Order Documentation (CCR Method)
CCR = Complaint, Cause, Resolution
Complaint
What was reported by the clinical staff.
Example:
"OR staff reported that the CO2 absorber canister on the Drager Atlan A100 would not fully lock after absorbent replacement."
Cause
What was observed during troubleshooting.
Example:
"Clinical Engineering found absorbent granules lodged on the canister sealing surface, preventing full seating."
Resolution
What action was taken.
Example:
"Clinical Engineering removed the loose granules, cleaned the accessible sealing surface, reinstalled the canister, verified secure locking and a passing leak/system test, and returned the machine to service."
Helpful Details to Include (If Known)
- Whether issue followed absorbent replacement
- Canister condition
- Absorbent loading
- Foreign material found
- Seal and gasket condition
- Known-good canister comparison
- Locking behavior
- Leak-test result
- Bypass behavior
- Final device status
Final Thought
Absorber problems should be handled as breathing-system integrity issues. Inspect the canister, absorbent, seals, and locking interface before assuming an internal mechanism failure, and escalate if secure seating and sealing cannot be verified.
That is successful troubleshooting.