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What This Guide Helps With
Troubleshoot a failed expiratory-valve device check caused by installation, contamination, circuit setup, leakage, connections, or a valve requiring service.
Step-by-Step Troubleshooting
1. Protect the Patient and Remove the Ventilator From Active Support
Do not troubleshoot an unreliable expiratory valve while a patient depends on the ventilator. Transfer ventilation to another verified ventilator or appropriate backup method before continuing.
Confirm that the Evita XL is no longer providing patient support and retain the reported device-check result for documentation.
Expected outcome: The patient has uninterrupted respiratory support from another verified source and the affected ventilator is available for safe evaluation. If patient support has been safely transferred, continue troubleshooting.
2. Confirm the Exact Device-Check Failure
Repeat the device check under controlled conditions using the intended breathing circuit and accessories. Observe which portion of the check fails and whether the expiratory valve is specifically identified.
Do not repeatedly run the check without changing anything; first confirm that the failure is reproducible.
Expected outcome: The same expiratory-valve-related failure is reproduced consistently. If the device check now passes and repeated verification remains normal, troubleshooting can stop after final functional verification.
3. Inspect the Expiratory Valve Installation
Remove the expiratory valve only as permitted for routine operator-accessible handling. Inspect it for incomplete seating, incorrect assembly, visible contamination, moisture, damaged seals, cracked components, or foreign material.
Reinstall it fully and verify that all accessible components are correctly positioned.
Expected outcome: The expiratory valve is clean, intact, correctly assembled, and fully seated. If reseating corrects the failure and the complete device check passes, troubleshooting can stop.
4. Inspect the Breathing Circuit and Expiratory Path
Check the patient circuit, expiratory limb, water traps, filters, humidification components, and other connected accessories for obstruction, pooled condensate, loose fittings, incorrect installation, or obvious leakage.
Confirm that the circuit configuration matches the intended setup being tested.
Expected outcome: The expiratory path is unobstructed, dry where required, securely connected, and configured correctly. If correcting the circuit allows the check to pass, troubleshooting can stop.
5. Substitute Known-Good External Components
When compatible components are available, test with a known-good breathing circuit and known-good expiratory valve approved for the device.
Change one component at a time so the corrective action can be identified accurately.
Expected outcome: A known-good external setup passes the device check. If replacing a defective or contaminated external component resolves the failure, document the cause and stop troubleshooting.
6. Check for Leaks Around Accessible Connections
Inspect all external pneumatic connections involved in the device check. Verify that tubing, caps, test lungs, circuit connectors, and accessories are fully engaged and not cracked, stretched, or loose.
Expected outcome: No visible or detectable external leak remains. If correcting a loose or leaking connection allows the full device check to pass, troubleshooting can stop.
7. Repeat the Complete Device Check
After correcting any external issue, run the complete required device check rather than verifying only the expiratory-valve portion.
Observe valve operation and confirm that no new alarms or check failures appear.
Expected outcome: The ventilator completes the device check successfully with normal expiratory-valve operation. If successful, proceed to final verification and return-to-service documentation.
8. Perform Final Functional Verification
Connect appropriate approved test equipment or a test lung and verify basic ventilation, pressure behavior, exhalation, alarm response, and other required return-to-service functions.
Do not return the ventilator to clinical use based solely on one passed subtest.
Expected outcome: The ventilator performs normally throughout the required functional verification. Troubleshooting can stop and the device may be returned to service according to facility policy.
9. Escalate an Unresolved Failure
If the expiratory valve and circuit are known good, correctly installed, and leak-free but the check still fails, stop external troubleshooting. The problem may involve internal pneumatic control, sensing, valve actuation, calibration, or another service-level condition.
Expected outcome: The unresolved ventilator is removed from service and routed for qualified bench evaluation rather than returned to patient care.
If the Problem Persists
Common external causes such as valve seating, contamination, circuit configuration, leaks, moisture, and defective accessories have been ruled out.
Remove the Evita XL from service, label it Out of Service, and send it for repair or bench evaluation. Evaluation should use appropriate Drager service documentation and approved test equipment. Internal pneumatic, sensing, calibration, or control-system work should be performed only by qualified personnel.
After repair, complete all required device checks, functional tests, alarm verification, and return-to-service testing before clinical use. Knowing when to stop external troubleshooting and escalate is proper troubleshooting.
Clinical Use Tip
Move the patient to another verified ventilator before investigating any expiratory-valve problem that could affect exhalation, pressure control, or ventilation.
Work Order Documentation (CCR Method)
CCR = Complaint, Cause, Resolution
Complaint
What was reported by the clinical staff.
Example:
"Respiratory Therapy reported that the Drager Evita XL repeatedly failed the device check at the expiratory valve."
Cause
What was observed during troubleshooting.
Example:
"Clinical Engineering found the expiratory valve was not fully seated and the remaining circuit components were intact."
Resolution
What action was taken.
Example:
"The expiratory valve was correctly reseated, the complete device check and functional verification passed, and the ventilator was returned to service."
Helpful Details to Include (If Known)
- Exact device-check failure displayed
- Expiratory valve condition and seating
- Circuit and filter configuration
- Presence of condensate or contamination
- Known-good valve or circuit substitution
- External leaks found
- Results before and after correction
- Complete device-check result
- Final return-to-service status
Final Thought
Protect the patient first, verify the complete expiratory path before assuming an internal failure, confirm the correction with a full device check, escalate appropriately, and clearly document the complaint, cause, and resolution.
That is successful troubleshooting.