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What This Guide Helps With
Troubleshoot blood-pump stoppage, noise, or unstable speed caused by tubing installation, pump-door conditions, obstruction, disposables, controls, or internal drive problems.
Step-by-Step Troubleshooting
1. Protect the Patient and Maintain Blood-Circuit Safety
Do not troubleshoot a blood pump that stops, runs unpredictably, or produces abnormal mechanical noise while a patient depends on it.
Follow clinical procedure for safely managing the extracorporeal circuit and transfer treatment to another verified machine as required.
Expected outcome: The patient and blood circuit are safely managed before technical evaluation begins.
2. Confirm the Exact Pump Complaint
Determine whether the pump will not start, starts and stops, rotates slowly, varies in speed, makes grinding or rubbing noise, or fails only with a particular bloodline.
Record any displayed alarm or message exactly.
Expected outcome: The pump problem is clearly characterized and reproducible under non-patient conditions.
3. Inspect Blood-Pump Tubing Installation
Verify the pump segment is installed correctly in the roller-pump pathway and is not twisted, stretched, pinched, misaligned, or improperly seated.
Do not force the tubing into the mechanism.
Expected outcome: The bloodline is correctly installed. If correcting tubing placement restores smooth stable operation and all tests pass, troubleshooting may stop.
4. Inspect the Pump Door and Accessible Mechanism
Check that the pump door or cover closes correctly and is not obstructed by tubing, debris, dried residue, or physical damage.
Inspect only externally accessible surfaces and do not remove the pump assembly.
Expected outcome: The pump area is clean, unobstructed, and closes normally.
5. Check the Disposable Bloodline
Inspect the pump segment for deformation, improper size, stiffness, manufacturing damage, or contamination.
Substitute a known-good compatible bloodline when appropriate.
Expected outcome: If the problem follows the disposable, replace the affected bloodline and verify normal pump operation.
6. Verify User Controls and Programmed Speed
Check accessible blood-pump controls and verify the selected speed or operating state is intentional.
Confirm the pump is not being held by another active machine safety condition or alarm.
Expected outcome: Controls are functioning and no external operating condition is preventing expected pump operation.
7. Observe Pump Operation Without Patient Connection
Operate the pump using an approved non-patient test setup and observe rotation, sound, speed stability, and response to normal control changes.
Stop the test if there is grinding, binding, overheating, or severe vibration.
Expected outcome: The pump rotates smoothly and maintains the commanded operating state.
8. Perform Approved Speed Verification When Required
If within Clinical Engineering scope, use approved test methods to verify blood-pump performance in accordance with B. Braun service documentation.
Do not adjust motor or speed calibration without approved procedure.
Expected outcome: Pump performance meets applicable manufacturer requirements.
9. Escalate Persistent Mechanical or Speed Problems
If tubing installation, pump-door condition, disposables, accessible controls, and external obstructions are ruled out but the problem remains, remove the machine from service.
Expected outcome: Motor, drive, feedback, mechanical, calibration, or control issues are referred for qualified service evaluation.
If the Problem Persists
Common external causes have been ruled out. Remaining problems may involve the blood-pump drive, motor, speed feedback, mechanical assembly, control electronics, calibration, or another internal condition.
The device should be:
- Removed from service.
- Labeled Out of Service.
- Sent for repair or bench evaluation.
- Evaluated using appropriate B. Braun service documentation and approved test equipment.
- Repaired or calibrated only by qualified personnel.
Complete required blood-pump, alarm, functional, and safety testing before return to clinical service.
Stopping when abnormal noise or unstable pump operation persists is proper troubleshooting.
Clinical Use Tip
Do not return a blood pump to service merely because it starts turning; verify smooth operation and stable commanded performance.
Work Order Documentation (CCR Method)
CCR = Complaint, Cause, Resolution
Complaint
What was reported by the clinical staff.
Example:
"Dialysis staff reported the blood pump was noisy and would not maintain a steady operating speed."
Cause
What was observed during troubleshooting.
Example:
"Clinical Engineering found the pump segment of the disposable bloodline was twisted and incorrectly seated in the pump pathway."
Resolution
What action was taken.
Example:
"A known-good bloodline was installed correctly, pump operation became smooth and stable, and the machine passed functional verification before return to service."
Helpful Details to Include (If Known)
- Pump will not start or stops
- Noise description
- Speed instability
- Exact displayed message
- Bloodline type
- Pump-segment condition
- Pump-door condition
- Known-good bloodline result
- Functional test result
- Results before and after correction
- Final device status
Final Thought
Protect the patient and extracorporeal circuit, verify tubing and disposable setup before assuming motor failure, test pump operation under safe conditions, escalate persistent faults, and document the verified repair outcome.
That is successful troubleshooting.