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What This Guide Helps With
This guide assists Clinical Engineering in troubleshooting and managing internal battery degradation in Puritan Bennett 840 ventilators. Battery degradation can lead to shortened backup time, inability to hold charge, or unexpected power loss during transport or power interruptions. Most causes are related to normal battery wear over time, but proper verification and safe handling are essential before escalation.
Step-by-Step Troubleshooting
Verify Power Source
- Ensure the ventilator is connected to a verified working AC outlet or hospital-grade power supply.
- Confirm indicator lights show AC power is present.
- Why: Some battery faults appear as battery degradation when the device is actually not charging due to external power issues.
Check Battery Charge Status
- Navigate to the ventilator's battery status menu.
- Record current charge percentage and estimated backup time.
- Why: Confirms whether the battery is holding charge and if degradation is gradual or sudden.
Inspect Battery Connection
- Power off the ventilator.
- Remove and reseat the internal battery, ensuring all connectors are secure.
- Why: Loose connections can mimic battery degradation symptoms.
Perform Battery Test (if available)
- Run the built-in battery test function.
- Note any warnings or failures reported by the ventilator.
- Why: Provides manufacturer-recommended evaluation of battery health.
Observe Ventilator During AC Power Loss Simulation
- Only if safe: disconnect AC power and ensure backup battery maintains operation for the expected duration.
- Why: Confirms real-world battery performance.
If the Problem Persists
If battery fails to hold charge, shows rapid depletion, or fails the internal test:
- Remove the ventilator from service.
- Label as Out of Service – Battery Fault.
- Send to authorized service or manufacturer for battery replacement.
Clinical Engineering Note: Knowing when to escalate is proper troubleshooting. Internal battery replacement requires manufacturer-approved service.
Clinical Use Tip
- Never rely on a degraded internal battery for patient transport or during power outages.
- Always ensure a ventilator is connected to AC power before use if the battery is in question.
- Use a ventilator with verified battery backup for critical care or patient transport.
Work Order Documentation (CCR Method)
CCR = Complaint, Cause, Resolution
Complaint
What was reported by the clinical staff.
Example:
“Ventilator battery backup only lasts ~10 minutes and battery warning displayed.”
Cause
What was observed during troubleshooting.
Example:
“Observed internal battery capacity below manufacturer specifications; battery fails internal test and cannot maintain power during AC disconnect simulation.”
Resolution
What action was taken.
Example:
“Ventilator removed from service, labeled Out of Service, and sent for authorized battery replacement.”
Helpful Details to Include
- Battery test results and backup duration.
- Ventilator AC power source tested.
- Any error messages displayed during testing.
- Last battery replacement date (if known).
Final Thought
Proper identification of internal battery degradation is critical for patient safety. Troubleshooting should progress from simple verification of AC power and connections to testing battery performance. Escalating to manufacturer service for replacement avoids unnecessary risk and ensures reliable ventilator operation. Accurate CCR documentation supports accountability and departmental records.
That is successful troubleshooting.