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What This Guide Helps With
This guide assists Clinical Engineering in troubleshooting circuit leak or tubing disconnection errors on a Vyaire VELA ventilator. Symptoms may include high leak alarms, intermittent loss of pressure, inconsistent tidal volume delivery, or ventilator prompts indicating “circuit disconnected” or “check circuit.” The focus is on external checks and patient safety before considering internal repairs.
Step-by-Step Troubleshooting
Verify Patient Safety First
- Ensure the patient is stable and, if necessary, transfer to a backup ventilator before troubleshooting.
- Never attempt troubleshooting while the patient is dependent on the device.
Check Circuit Connections
- Confirm all tubing connections (inspiratory, expiratory, and humidifier lines) are securely attached.
- Inspect for loose or partially inserted connectors at the patient interface and ventilator ports.
Inspect Tubing for Damage
- Look for kinks, cracks, or holes in the breathing circuit tubing.
- Replace any tubing showing wear, tears, or discoloration.
Examine Humidifier and Accessories
- Ensure the humidifier chamber is seated correctly and properly connected to the ventilator.
- Confirm that any bacterial/viral filters or inline sensors are correctly installed and not obstructed.
Check for Obstructions or Moisture
- Remove any visible condensate or liquid buildup in the circuit, which can trigger false leak alarms.
- Verify that tubing is free of condensation traps or blockages.
Confirm Ventilator Settings and Alarm Configuration
- Verify that the ventilator is set for the correct circuit type and patient parameters.
- Ensure leak detection alarms are enabled and appropriately set according to manufacturer guidelines.
Power Cycle the Ventilator
- Safely disconnect the ventilator from AC power if not in active patient use and allow it to reboot.
- Observe for persistent alarms upon restart.
If the Problem Persists
All external checks have been completed and common causes ruled out. The issue may be internal, such as a defective flow sensor or internal circuit port.
- Remove the device from service.
- Label as Out of Service.
- Send to the biomedical repair bench or manufacturer for evaluation.
Knowing when to stop troubleshooting is proper Clinical Engineering practice.
Clinical Use Tip
- Never troubleshoot a suspected circuit leak while the patient is connected if alternative ventilation is unavailable.
- Always have a backup ventilator ready to maintain patient safety.
- Document findings and actions promptly to assist future troubleshooting and regulatory compliance.
Work Order Documentation (CCR Method)
CCR = Complaint, Cause, Resolution
Complaint
What was reported by the clinical staff.
Example:
“User reports “High leak alarm” or “Circuit disconnected” message during ventilation.”
Cause
What was observed during troubleshooting.
Example:
“Tubing found disconnected at expiratory port; inspiratory line kinked near humidifier chamber.”
Resolution
What action was taken.
Example:
“Reconnected all tubing, replaced kinked section, verified secure connections, and confirmed leak alarm cleared.”
Helpful Details to Include
- Circuit tubing inspected for kinks or tears
- Humidifier seated properly
- Filters and sensors checked
- Alarm behavior observed before and after intervention
- Ventilator power cycle status
Final Thought
Circuit leaks and disconnections are common and often externally resolvable issues. Proper stepwise troubleshooting preserves patient safety, avoids unnecessary repairs, and ensures accurate documentation. Always escalate if external checks do not resolve the problem, and confirm the ventilator is safe before returning it to service.
That is successful troubleshooting.