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What This Guide Helps With
The ventilator does not recognize the expiratory cassette or indicates that the cassette is improperly installed, contaminated, damaged, or incompatible.
Step-by-Step Troubleshooting
1. Protect the Patient and Maintain Ventilation
Do not manipulate the expiratory cassette while a patient depends on unreliable ventilator operation. Transfer the patient to another verified ventilator or appropriate backup ventilation before troubleshooting.
Expected outcome: Ventilation continues safely on reliable equipment.
2. Confirm the Reported Condition
Power the ventilator normally and confirm whether the cassette-related message is present or whether recognition fails during startup or pre-use testing.
Record the exact displayed message.
Expected outcome: The cassette recognition problem is reproduced and documented.
3. Inspect the Cassette Installation
Confirm the expiratory cassette is fully inserted and seated in its normal operating position.
Remove and reinstall it using normal accessible handling. Do not force the cassette into place.
Expected outcome: The cassette seats securely and is recognized. If recognition returns consistently, proceed to verification and stop troubleshooting.
4. Inspect for Contamination or Moisture
Remove the cassette and inspect accessible surfaces for:
- Excess moisture
- Secretions
- Debris
- Residue
- Visible contamination
- Physical damage
Follow approved cleaning and drying practices before reinstalling.
Expected outcome: The cassette is clean, dry, and undamaged. If cleaning or drying restores recognition, troubleshooting can stop after successful verification.
5. Inspect the Cassette and Receptacle
Inspect the accessible cassette body and ventilator receiving area for cracked plastic, bent components, obstruction, contamination, or anything preventing complete insertion.
Do not probe or disassemble internal contacts or mechanisms.
Expected outcome: No external obstruction or damage prevents proper installation.
6. Test With a Known-Good Compatible Cassette
If available, install a known-good compatible expiratory cassette that has been appropriately prepared for use.
Expected outcome: If the known-good cassette is recognized, the original cassette is the likely source of the problem and should be removed from use. If neither cassette is recognized, continue troubleshooting.
7. Restart and Repeat the Pre-Use Check
After confirming correct cassette installation, restart the ventilator if appropriate and perform the manufacturer-approved pre-use check.
Expected outcome: The cassette is recognized and the pre-use check completes successfully.
8. Verify Ventilator Operation
Connect an appropriate test lung and verify stable ventilation, expected displayed values, and proper alarm operation before return to service.
Expected outcome: The ventilator operates normally with the cassette recognized throughout testing.
9. Escalate if Recognition Remains Unreliable
If a known-good cassette is still not recognized or recognition is intermittent, stop external troubleshooting.
Expected outcome: A ventilator with unreliable expiratory cassette detection is kept out of clinical service.
If the Problem Persists
External seating, contamination, cassette damage, and known-good substitution have been evaluated. Remaining causes may involve internal cassette detection, pneumatic interfacing, electronics, or related service-level systems.
The ventilator should be:
- Removed from service
- Labeled Out of Service
- Sent for repair or bench evaluation
- Evaluated using appropriate Getinge documentation and approved test equipment
- Repaired or configured only by qualified personnel
Perform complete pre-use and return-to-service testing after repair. Knowing when to stop external troubleshooting is proper troubleshooting.
Clinical Use Tip
An expiratory cassette that is intermittently recognized should not be considered reliable simply because the message clears temporarily.
Work Order Documentation (CCR Method)
CCR = Complaint, Cause, Resolution
Complaint
What was reported by the clinical staff.
Example:
"Respiratory Therapy reported that the Servo-c would not recognize the expiratory cassette during setup."
Cause
What was observed during troubleshooting.
Example:
"Clinical Engineering found moisture and residue preventing the cassette from seating completely."
Resolution
What action was taken.
Example:
"The cassette area was cleaned and dried according to approved practices, the cassette seated correctly, and the ventilator passed its pre-use and functional checks."
Helpful Details to Include (If Known)
- Exact displayed message
- Cassette part or type used
- Cassette seating condition
- Moisture or contamination found
- Visible damage
- Known-good cassette result
- Pre-use check result
- Test lung verification
- Final device status
Final Thought
Protect the patient, verify cassette seating and condition before suspecting an internal fault, use known-good substitution when appropriate, and escalate any persistent or intermittent recognition problem.
That is successful troubleshooting.