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What This Guide Helps With
Troubleshooting syringe detection, size recognition, plunger engagement, and syringe-clamp errors caused by loading, compatibility, contamination, or external mechanical issues.
Step-by-Step Troubleshooting
1. Ensure Patient Safety First
Do not unload, reposition, or replace the syringe while the pump is actively delivering medication to a patient.
- Notify the responsible clinical staff.
- Transfer the infusion to another verified pump when continued therapy is required.
- Clamp or secure the medication line as clinically appropriate before manipulating the syringe.
- Use additional caution with vasoactive, sedating, high-alert, or short-half-life medications.
Expected outcome: The patient’s therapy continues safely without relying on a pump that cannot reliably recognize the syringe.
2. Confirm the Exact Recognition Failure
Record the complete displayed message and determine whether:
- The pump does not recognize that a syringe is installed.
- The detected syringe size is incorrect.
- The syringe barrel clamp is not recognized as closed.
- The plunger plate or drive head is not detected.
- The error appears immediately after loading.
- The error occurs only with a particular syringe brand or size.
Expected outcome: The failure is clearly defined before components are moved or replaced.
3. Verify the Syringe Is Approved and Compatible
Confirm that the syringe manufacturer, model, and size are approved for the pump and included in the facility’s configured syringe library.
Do not assume that two syringes with the same labeled volume have identical barrel dimensions or plunger geometry.
Expected outcome: The installed syringe matches an approved selection available on the pump.
If the syringe is not approved or cannot be correctly selected, replace it with a compatible syringe and stop troubleshooting if normal recognition returns.
4. Inspect the Syringe for Damage or Deformation
Remove the syringe when safe and inspect for:
- Cracked or distorted barrel flanges
- Bent or damaged plunger flanges
- An unevenly seated plunger
- A loose or separated plunger rod
- Labels, tape, or residue around the barrel
- An overfilled or unusually pressurized syringe
- Manufacturing defects or dimensional irregularities
Expected outcome: The syringe is physically intact and able to seat normally in the pump.
Replace a questionable syringe using approved medication-transfer procedures. If the replacement is recognized correctly, remove the original syringe from use and stop.
5. Reload the Syringe Carefully
Follow the pump’s normal loading sequence.
- Open the syringe holder or barrel clamp fully.
- Position the syringe barrel and flange squarely in their intended locations.
- Ensure the syringe is not twisted, angled, or resting above the seating surfaces.
- Align the plunger flange with the drive mechanism.
- Close the syringe clamp completely without forcing it.
- Confirm that the plunger retention mechanism engages correctly.
Expected outcome: The syringe sits flat, the clamp closes fully, and the plunger is securely captured.
If the pump recognizes the correct syringe size and permits normal setup, the issue was likely improper loading. Stop troubleshooting.
6. Check the Barrel Clamp and Plunger Mechanism Externally
With the pump removed from patient use, operate the externally accessible syringe clamp and plunger-retention components through their normal range.
Check for:
- Binding or sticking
- Excessive looseness
- Incomplete travel
- Visible cracks or misalignment
- A component that does not return normally
- Resistance caused by dried medication or debris
Do not force any mechanism.
Expected outcome: All external syringe-retention components move smoothly and reach their normal positions.
7. Inspect for Contamination or Obstruction
Examine accessible syringe seating areas, clamp surfaces, flange slots, and plunger-contact areas for:
- Dried medication
- Adhesive residue
- Broken label material
- Dust or lint
- Foreign objects
- Fluid intrusion
- Corrosion or discoloration
Clean only by the manufacturer-approved external cleaning method. Do not spray liquid directly into openings or use sharp tools.
Expected outcome: The loading and detection areas are clean, dry, and unobstructed.
If cleaning restores recognition, complete functional verification before returning the pump to service.
8. Verify the Syringe Selection on the Display
When the pump prompts for syringe information:
- Confirm that the displayed manufacturer and size match the installed syringe.
- Do not accept an incorrect syringe size merely to bypass the warning.
- Check whether the expected syringe option is absent from the configured library.
- Confirm that the pump is using the correct care area, profile, or configuration when applicable.
Expected outcome: The displayed syringe selection agrees with the physical syringe.
An incorrect syringe selection can affect delivery accuracy and must be corrected before clinical use.
9. Test With Another Approved Syringe
Using a new, empty, approved syringe of the same type and size, repeat the loading process.
Then, when appropriate, test a second approved syringe size.
Expected outcome: The pump consistently recognizes approved syringes and correctly identifies their sizes.
If only one syringe fails, suspect the syringe or its compatibility.
If multiple approved syringes fail, suspect the pump’s clamp, plunger-detection, position-sensing, or mechanical system.
10. Restart the Pump When Safe
With the pump disconnected from the patient and the syringe removed:
- Power the pump off normally.
- Disconnect it from the SpaceStation or external accessories when applicable.
- Wait briefly.
- Restore power and allow the startup sequence to complete.
- Reload an approved test syringe.
Expected outcome: The pump completes startup and recognizes the syringe normally.
If the error returns, do not repeatedly restart the device to bypass the condition.
11. Check for Docking or Accessory Interference
If the issue occurs while the pump is installed in a B. Braun SpaceStation or mounted near other equipment:
- Remove the pump from the station when safe.
- Confirm that adjacent pumps, cables, brackets, or pole-mount hardware do not obstruct syringe loading.
- Inspect the pump housing for signs of impact or distortion.
- Repeat the syringe-recognition test as a standalone device.
Expected outcome: The syringe mechanism operates without external obstruction or mounting pressure.
12. Perform a Controlled Functional Verification
Before returning the pump to service:
- Confirm that the correct syringe size is detected.
- Verify that the barrel clamp remains securely closed.
- Confirm that the plunger is captured correctly.
- Run an approved non-patient functional test.
- Check for unexpected alarms, slipping, unusual sounds, or visible movement.
- Perform any facility-required delivery-accuracy verification following a syringe-recognition complaint.
Expected outcome: Syringe recognition and pump operation are repeatable and reliable.
If recognition is intermittent or cannot be reproduced consistently, remove the pump from service.
If the Problem Persists
If multiple approved, undamaged syringes have been loaded correctly and external contamination, obstruction, configuration, and mounting issues have been ruled out, the failure is likely internal.
Possible internal causes may include a failed position sensor, syringe-size detection mechanism, clamp sensor, plunger-detection component, drive alignment issue, or associated electronics.
The pump should be:
- Removed from service
- Labeled Out of Service
- Sent for repair or qualified bench evaluation
Do not continue clinical use by manually accepting an incorrect syringe size or bypassing a clamp or plunger-recognition warning.
Knowing when to stop is proper troubleshooting.
Clinical Use Tip
Never troubleshoot syringe-recognition failures on an active patient. Transfer the infusion first, secure the medication line, and verify the replacement pump’s programming independently before resuming therapy.
Work Order Documentation (CCR Method)
CCR = Complaint, Cause, Resolution
Complaint
What was reported by the clinical staff.
Example:
"Clinical staff reported that the B. Braun Space syringe pump would not recognize a loaded 20 mL syringe and displayed a syringe-clamp warning."
Cause
What was observed during troubleshooting.
Example:
"The approved syringe was loaded correctly, but the barrel clamp did not consistently register its fully closed position during repeated testing."
Resolution
What action was taken.
Example:
"Removed the pump from service, labeled it Out of Service, and routed it for bench evaluation of the syringe-clamp detection mechanism."
Helpful Details to Include (If Known)
- Exact displayed error or alarm
- Syringe manufacturer and product line
- Syringe size
- Syringe lot number
- Whether the syringe was approved
- Whether another syringe was tested
- Correct or incorrect detected size
- Barrel-clamp behavior
- Plunger-retention behavior
- Visible contamination or damage
- Station-mounted versus standalone result
- Startup or restart result
- Functional-test result
- Unusual sounds or resistance
- Final device status
Final Thought
Syringe-recognition problems can directly affect infusion accuracy and medication delivery. Start with patient safety, verify syringe compatibility and loading, inspect accessible mechanisms, and escalate any inconsistent detection. Clear CCR documentation supports safe repair decisions and future trend analysis.
That is successful troubleshooting.