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What This Guide Helps With
Troubleshoots NIBP inflation and measurement failures caused by cuff, hose, connection, leakage, positioning, settings, or monitor pneumatic problems.
Step-by-Step Troubleshooting
1. Protect the Patient and Maintain Blood Pressure Monitoring
If NIBP measurement is clinically required and the Avalon FM50 cannot obtain a reliable reading, use another verified blood pressure measurement method or monitor before troubleshooting.
Do not repeatedly cycle an unreliable cuff on a patient as a troubleshooting method.
Expected outcome: Reliable blood pressure monitoring remains available.
2. Confirm the Exact Failure
Determine whether:
- The cuff does not inflate
- Inflation begins but stops
- Pressure leaks down
- The measurement times out or fails
- The issue is intermittent
- The problem occurs with one cuff or all cuffs
If clinically safe and no patient depends on the unit, reproduce the problem using an appropriate test setup.
Expected outcome: The NIBP failure pattern is clearly identified.
3. Inspect the Cuff
Inspect the cuff for:
- Tears
- Damaged bladder or tubing
- Loose fittings
- Contamination
- Incorrect cuff assembly
- Obvious wear
If the original complaint occurred during patient use, confirm that clinical staff were using an appropriately selected cuff and placement.
Expected outcome: The cuff is intact and suitable for testing.
4. Inspect the NIBP Hose
Check the hose for:
- Kinks
- Cuts
- Pinched sections
- Loose fittings
- Cracked connectors
- Blockage
- Damage near strain-relief points
Expected outcome: The hose provides an unobstructed, leak-free pneumatic path.
5. Reseat All External Pneumatic Connections
Reconnect the cuff-to-hose and hose-to-monitor connections securely.
Ensure connectors are fully seated without forcing them.
Expected outcome: The pneumatic circuit is securely connected.
If normal inflation and measurement return, proceed to final verification.
6. Substitute Known-Good Cuff and Hose Components
Replace the cuff and hose one component at a time with known-good compatible accessories.
This isolates the monitor from external pneumatic leaks or restrictions.
Expected outcome: The monitor performs normally with known-good accessories, or the fault remains with the monitor.
If the problem follows the original cuff or hose, replace the defective accessory and stop troubleshooting after successful verification.
7. Verify NIBP Controls and Measurement Settings
Confirm the monitor is set for the intended patient category and measurement operation using authorized normal controls.
Do not change settings simply to force a measurement or bypass a safety-related failure.
Expected outcome: NIBP is configured appropriately for the intended controlled test.
8. Perform a Controlled NIBP Functional Test
Use approved NIBP test equipment and manufacturer-supported test methods available to Clinical Engineering.
Verify:
- Inflation initiates normally
- The pneumatic circuit holds and releases pressure appropriately
- Measurement cycles complete
- No abnormal sounds or repeated failed cycles occur
Do not improvise pressure tests or exceed approved test conditions.
Expected outcome: The NIBP system completes controlled functional testing normally.
If successful, troubleshooting can stop after any required safety or performance verification.
9. Inspect the External NIBP Port
Check the accessible port for visible damage, looseness, obstruction, or contamination.
Do not open the monitor or service internal valves or pumps during external troubleshooting.
Expected outcome: The external pneumatic connection is mechanically sound.
10. Escalate Persistent NIBP Failure
If the monitor fails controlled testing with known-good cuff and hose assemblies, remove the unit from service.
Expected outcome: A monitor with unreliable blood pressure measurement capability is sent for appropriate bench evaluation.
If the Problem Persists
External cuff, hose, connection, positioning, and configuration problems have been ruled out.
Persistent NIBP failure may involve the internal pneumatic system, pressure sensing, control circuitry, calibration, or another service-level condition. Do not identify a specific pump, valve, or sensor as failed without supported diagnostic evidence.
The device should be:
- Removed from service
- Labeled Out of Service
- Sent for repair or bench evaluation
- Evaluated using appropriate Philips documentation and approved NIBP test equipment
- Repaired or calibrated only by qualified personnel
Following repair, complete applicable NIBP performance and safety verification before return to service.
Knowing when to stop external troubleshooting and escalate is proper troubleshooting.
Clinical Use Tip
Avoid repeated failed cuff cycles on a patient; establish an alternate verified blood pressure method while the affected NIBP channel is evaluated.
Work Order Documentation (CCR Method)
CCR = Complaint, Cause, Resolution
Complaint
What was reported by the clinical staff.
Example:
"Clinical staff reported that the Avalon FM50 NIBP cuff began inflating but repeatedly failed to complete a blood pressure measurement."
Cause
What was observed during troubleshooting.
Example:
"Clinical Engineering found a leak in the external NIBP hose, while the monitor completed testing normally with a known-good cuff and hose."
Resolution
What action was taken.
Example:
"Replaced the damaged NIBP hose and verified normal inflation, measurement cycling, and controlled NIBP functional performance."
Helpful Details to Include (If Known)
- Whether the cuff inflated
- Cuff condition
- Hose condition
- Connection condition
- Patient category setting observed
- Known-good cuff result
- Known-good hose result
- NIBP test-equipment result
- Abnormal pneumatic sounds
- Final monitor status
Final Thought
NIBP failures are often caused by cuffs, hoses, connections, or setup rather than internal hardware. Protect patient monitoring first, isolate the external pneumatic path, verify the monitor with approved test equipment, and escalate if reliable measurement cannot be demonstrated.
That is successful troubleshooting.