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What This Guide Helps With
Troubleshooting failed maternal blood pressure measurements caused by cuff, hose, connection, sizing, positioning, settings, movement, or pneumatic leakage.
Step-by-Step Troubleshooting
1. Ensure Patient Safety and Obtain an Alternate Measurement
Do not rely on an NIBP channel that will not inflate, repeatedly aborts, or produces questionable results.
Notify clinical staff and obtain maternal blood pressure with another verified monitor or approved manual method. Do not repeatedly cycle a cuff on a patient while troubleshooting.
Expected outcome: A reliable maternal blood pressure is available through an alternate method.
2. Confirm the Exact Reported Condition
Determine whether:
- The cuff does not inflate at all.
- Inflation begins and immediately stops.
- The cuff inflates but no value is produced.
- Measurements are intermittent.
- Readings are clinically implausible.
- Automatic interval measurements fail but manual initiation works.
- The problem occurs with one cuff or all cuffs.
- A message appears during the attempt.
Record the reported message and the conditions under which the failure occurs.
Expected outcome: The failure is defined as no inflation, pneumatic leak, measurement abort, poor signal, or control/configuration issue.
3. Verify Monitor Operation and NIBP Availability
Confirm that the Philips Avalon FM30 completes startup and other monitoring functions operate normally.
Verify that the NIBP function is available, not disabled, and not affected by a broader monitor freeze or startup problem.
Expected outcome: The monitor is responsive and the NIBP function can be selected. If the entire monitor is unresponsive, remove it from use and troubleshoot the broader failure.
4. Inspect the Cuff
Check the cuff for:
- Tears, holes, or worn fabric.
- Damaged hook-and-loop closure.
- Kinked or separated tubing.
- Cracked fittings.
- Incorrect cuff type.
- Contamination or fluid intrusion.
- Bladder folding or displacement.
Do not use a damaged cuff.
Expected outcome: The cuff is intact and compatible. If damage is found, replace it with an approved cuff and retest.
5. Verify Cuff Size and Application
Confirm the cuff size is appropriate for the patient and that it is applied to an appropriate limb with the tubing unobstructed.
Check for:
- Cuff applied too loosely.
- Clothing trapped beneath the cuff.
- Tubing compressed under the patient.
- Excessive limb movement.
- Improper cuff placement.
- Unsupported limb or unusual positioning.
Expected outcome: The cuff is correctly sized, positioned, and secured. If measurement succeeds after correction, compare the result with an appropriate clinical reference and stop troubleshooting.
6. Inspect and Reseat the NIBP Hose
Trace the hose from the cuff to the monitor. Check for kinks, crushing, stretching, cracks, loose fittings, and damaged connectors.
Disconnect and reconnect both ends firmly. Ensure the hose is connected to the correct NIBP port and is not partially engaged.
Expected outcome: The hose is open, intact, and securely connected. If normal inflation and measurement return, complete final verification and stop troubleshooting.
7. Check for an External Pneumatic Leak
Start a measurement while observing the cuff and hose. Listen for escaping air and watch for rapid cuff deflation.
Do not obstruct the hose or attempt to plug the system with unapproved fittings.
Expected outcome: The cuff inflates without audible or visible external leakage. An external leak identifies the cuff, hose, or connector as the likely cause.
8. Substitute a Known-Good Cuff and Hose
Use a verified compatible cuff and NIBP hose known to work correctly.
Replace the cuff and hose as a set when practical to avoid misidentifying which external item is defective.
Expected outcome: Successful measurement with the known-good set confirms an accessory problem. Remove the failed cuff or hose from service.
9. Verify Measurement Controls and Settings
Confirm that:
- The measurement is being initiated correctly.
- The selected patient category is appropriate.
- Automatic cycling is not paused or canceled.
- No unintended control lockout is active.
- The configured interval is understood by staff.
- The NIBP function has not been disabled through an authorized setting.
Do not change protected configuration without authorization.
Expected outcome: The NIBP controls and user-accessible settings permit measurement. If a corrected setting restores normal operation, document it and stop troubleshooting.
10. Test with an Approved NIBP Analyzer
Remove the monitor from patient use and connect an approved NIBP simulator or analyzer using the correct setup.
Perform only the verification procedures authorized by local policy and Philips documentation. Do not use a person as a test subject for repeated troubleshooting cycles.
Expected outcome: The monitor inflates, deflates, and completes the approved functional test within applicable requirements.
11. Compare the Monitor with Another Verified Accessory Setup
If the monitor fails with the analyzer or multiple known-good accessory sets, compare operation with another verified Philips Avalon FM30 when available.
Expected outcome: The comparison confirms whether the problem is isolated to the monitor or the external accessories.
12. Perform Final Functional Verification
After correction:
- Confirm cuff inflation and controlled deflation.
- Verify at least one successful measurement using an approved test method.
- Check for external leakage.
- Confirm manual and configured automatic initiation as applicable.
- Verify displayed values, status messages, and alarms.
- Confirm the cuff and hose remain securely connected.
- Complete applicable performance and safety testing.
Expected outcome: The NIBP channel consistently completes measurements and passes required verification. Troubleshooting can stop.
13. Stop and Escalate When the NIBP Function Remains Unreliable
Remove the Philips Avalon FM30 from service when:
- Multiple known-good cuffs and hoses fail.
- The monitor will not inflate an approved analyzer.
- Inflation is uncontrolled or does not terminate appropriately.
- Pneumatic leakage appears internal to the monitor.
- The NIBP port is damaged or loose.
- The monitor freezes or resets during measurement.
- Results remain inconsistent or clinically implausible.
Expected outcome: An unreliable blood pressure channel is not returned to patient care.
If the Problem Persists
Common external causes such as cuff damage, incorrect sizing, poor placement, hose obstruction, loose connections, settings, and accessory leakage have been ruled out. The remaining cause may involve the internal pneumatic system, pressure sensing, valves, pump, monitor configuration, or control software.
Remove the device from service, label it Out of Service, and send it for bench evaluation using approved NIBP test equipment and current Philips documentation. Internal repair or calibration should be performed only by qualified personnel.
Return the monitor to service only after the NIBP channel passes required performance, leak, safety, control, and alarm verification. Knowing when to stop external troubleshooting is proper troubleshooting.
Clinical Use Tip
Obtain maternal blood pressure by another verified method before repeatedly attempting failed cuff cycles.
Work Order Documentation (CCR Method)
CCR = Complaint, Cause, Resolution
Complaint
What was reported by the clinical staff.
Example:
"Clinical staff reported that the Philips Avalon FM30 NIBP cuff inflated briefly and then aborted without displaying a blood pressure."
Cause
What was observed during troubleshooting.
Example:
"Clinical Engineering found a cracked cuff hose connector that leaked during inflation, while the monitor passed testing with a known-good cuff and hose."
Resolution
What action was taken.
Example:
"The damaged hose was replaced, and inflation, deflation, measurement completion, displayed values, and alarm operation were verified with approved test equipment."
Helpful Details to Include (If Known)
- Whether the cuff inflated.
- Displayed message or failure behavior.
- Cuff size and placement.
- Cuff and hose condition.
- Patient movement or positioning.
- Manual versus automatic measurement behavior.
- Known-good accessory results.
- External leak findings.
- NIBP analyzer results.
- Final measurement and alarm verification.
- Final equipment status.
Final Thought
Protect the patient by obtaining an alternate pressure, then check the cuff, hose, positioning, connections, and settings before suspecting the internal pneumatic system, and document the verified correction.
That is successful troubleshooting.