On this page
Asset Type
Manufacturer
Model
What This Guide Helps With
This guide assists Clinical Engineering in troubleshooting a Medfusion 3500 syringe infusion pump when staff report infusion programming errors, unexpected infusion rates, or alarms related to improper rate delivery. These issues often result from external setup, user entry errors, or software/configuration issues rather than hardware failure.
- Infusion rate not matching programmed value
- Pump stops or alarms unexpectedly during infusion
- Unexpected changes in infusion volume or duration
- Error messages related to programming or rate
Step-by-Step Troubleshooting
Verify User Programming
- Confirm that the rate, volume, and infusion type entered match the physician’s orders.
- Check for decimal placement errors or unit mismatches (mL/hr vs. µL/min).
Why it matters: Most programming errors are due to simple user entry mistakes.
Check Syringe Compatibility
- Ensure the syringe size and manufacturer are compatible with the Medfusion 3500.
- Confirm the syringe is seated correctly in the cassette/holder.
Why it matters: Incorrect syringe size can cause the pump to calculate the wrong delivery rate.
Inspect Cassette and Door Sensors
- Verify that the cassette is properly latched and that the pump detects it.
- Look for debris, wear, or damage on the sensor or cassette interface.
Why it matters: Misreading cassette presence can cause the pump to abort or miscalculate infusion rates.
Check for Active Alarms or Error Messages
- Note any on-screen errors and verify against the pump’s error reference.
- Clear non-critical alarms and attempt to reprogram.
Why it matters: Persistent alarms may indicate configuration issues or early signs of internal sensor problems.
Power Cycle the Pump
- Remove the pump from service temporarily, turn it off, and then back on.
- Reprogram a test infusion with a compatible syringe to verify correct behavior.
Why it matters: Resets internal logic and clears temporary software glitches.
Verify Pump Firmware / Software Version
- Confirm the pump is running the latest approved firmware for your facility.
- Check for any software update notices from Smiths Medical.
Why it matters: Firmware bugs can occasionally cause calculation errors.
If the Problem Persists
External causes have been ruled out (user entry, syringe, cassette, power, and alarms). Likely internal sensor, motor, or software fault.
- Remove pump from service
- Label as “Out of Service”
- Send for bench evaluation or repair
Knowing when to escalate ensures patient safety and proper troubleshooting.
Clinical Use Tip
- Never attempt programming tests on an active patient.
- Move the patient to another verified pump first.
- Only troubleshoot in a safe environment with a compatible test syringe.
Work Order Documentation (CCR Method)
CCR = Complaint, Cause, Resolution
Complaint
What was reported by the clinical staff.
Example:
Staff report that the Medfusion 3500 delivered an incorrect infusion rate or programming error.
Cause
What was observed during troubleshooting.
Example:
Initial inspection showed correct syringe and cassette placement. Programming errors appear persistent. No user entry errors detected; pump resets did not resolve the issue.
Resolution
What action was taken.
Example:
Pump removed from service, labeled “Out of Service,” and sent to Biomedical Engineering bench for evaluation. Patient switched to alternate verified infusion pump.
Helpful Details to Include
- Verify syringe type and lot number
- Note any recurring error codes
- Document firmware/software version
- Record last service date and battery status
Final Thought
Patient safety is the highest priority. Troubleshooting logic should move from simplest causes (user entry, syringe, power) to more complex possibilities. Proper documentation and knowing when to escalate are critical to safe and effective Clinical Engineering operations.
That is successful troubleshooting.