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Asset Type
Continuous Renal Replacement Therapy (CRRT)
Manufacturer
Model
What This Guide Helps With
This guide assists Clinical Engineering in troubleshooting pump module or pressure sensor-related issues on the PrismaFlex system. These problems may present as pressure alarms, inconsistent pressure readings, pump stoppages, or failure to initiate therapy. The focus is on identifying external and setup-related causes before assuming internal pump or sensor failure.
Step-by-Step Troubleshooting
Verify System Power and Startup Status
- Ensure the unit powers on normally with no boot errors.
- Confirm all modules initialize without faults.
- Why: Startup issues can mimic module or sensor failures.
Check for Active Alarms and Error Codes
- Review displayed alarms (arterial/venous pressure, TMP, access pressure).
- Document exact alarm messages.
- Why: Specific alarms help determine whether the issue is sensor-related or flow-related.
Inspect Cartridge Installation
- Ensure the cartridge is properly seated and fully locked into place.
- Verify tubing is correctly routed through pump segments and pressure pods.
- Why: Misalignment can prevent accurate pressure sensing or proper pump operation.
Check Tubing Placement in Pump Segments
- Confirm tubing is correctly loaded in all pump heads (blood, effluent, replacement).
- Ensure there is no twisting, kinking, or partial disengagement.
- Why: Improper loading affects pump rotation and pressure readings.
Inspect Pressure Sensor Pods and Interfaces
- Verify pressure lines are properly connected and seated in their designated ports.
- Check for fluid contamination, moisture, or debris in pressure pod areas.
- Why: Contaminated or improperly seated sensors can cause false readings or alarms.
Check for Air in Lines
- Inspect all lines for visible air bubbles, especially near pressure monitoring points.
- Prime the system if necessary.
- Why: Air can distort pressure readings and trigger alarms.
Verify Line Patency and Flow Path
- Check for clamps left closed, occlusions, or kinked tubing.
- Ensure smooth flow through the circuit.
- Why: Flow restrictions can trigger pressure alarms that appear sensor-related.
Swap Cartridge (If Available)
- Replace with a known-good cartridge set.
- Why: Eliminates disposable-related defects affecting pump or pressure readings.
Inspect for External Signs of Pump Issues
- Listen for abnormal noises (grinding, slipping, inconsistent rotation).
- Observe pump operation during setup or priming.
- Why: Mechanical pump issues may be externally noticeable.
Perform System Restart
- Power cycle the unit and reattempt setup.
- Why: Clears temporary faults or sensor communication errors.
Run Self-Test or Diagnostic (If Available)
- Use built-in diagnostics to evaluate pump and pressure sensor function.
- Why: Confirms whether the system detects internal faults.
If the Problem Persists
If all external causes have been ruled out and alarms or failures continue, the issue is likely due to internal pump module wear, pressure sensor drift, or control board faults.
- Remove the device from service
- Label as Out of Service
- Send for repair or bench evaluation
Recognizing when the issue is internal and stopping further troubleshooting is appropriate and ensures patient safety.
Clinical Use Tip
Do not attempt to troubleshoot pump or pressure-related issues while the system is connected to a patient. Always transition the patient to another CRRT device before evaluation to avoid interruption of therapy or risk of harm.
Work Order Documentation (CCR Method)
CCR = Complaint, Cause, Resolution
Complaint
What was reported by the clinical staff.
Example:
“Unit alarming with continuous arterial pressure errors and unable to start therapy.”
Cause
What was observed during troubleshooting.
Example:
“Improper tubing placement and pressure line not fully seated in sensor port, causing inaccurate readings.”
Resolution
What action was taken.
Example:
“Reseated tubing and pressure connections, verified proper cartridge installation, and confirmed normal operation during setup.”
Helpful Details to Include
- Outlet tested and system powered normally
- Cartridge swapped with known-good set
- Tubing placement verified
- Pressure pod condition (clean/dry/contaminated)
- Alarm messages observed
- Pump noise or abnormal operation noted
- Air presence in lines
- Final device status (in service or removed)
Final Thought
Effective troubleshooting of PrismaFlex pump and pressure issues relies on systematically ruling out setup and flow-related causes before assuming internal failure. Maintaining patient safety, avoiding unnecessary disassembly, and documenting findings clearly ensures efficient resolution and appropriate escalation when needed.
That is successful troubleshooting.