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What This Guide Helps With
This guide assists Clinical Engineering in troubleshooting a Smiths Medical CADD Legacy infusion pump when the keypad or buttons do not respond. Symptoms may include:
- Pump does not accept input from the keypad.
- Display remains unchanged despite button presses.
- Infusion cannot be started, paused, or stopped using the keypad.
The goal is to check external and easily verifiable causes before assuming an internal failure.
Step-by-Step Troubleshooting
Ensure Device is Powered
- Verify the pump is connected to a charged battery or AC power.
- Observe any indicator lights or display startup sequence.
- Why: A completely unpowered device can appear unresponsive.
Inspect for Obstructions or Debris
- Check the keypad for dirt, liquids, or sticky residue.
- Gently clean with a soft, lint-free cloth and approved cleaning solution.
- Why: Physical obstruction can prevent button actuation.
Check for Keypad Lock or Security Mode
- Some CADD Legacy pumps have keypad lock or programming lock features.
- Confirm the lock is not engaged. Refer to pump label or display prompts.
- Why: A locked keypad will not respond to input even if the device is functional.
Restart / Power Cycle the Pump
- Turn off the pump, wait 30 seconds, then power back on.
- Observe any boot-up errors or abnormal behavior.
- Why: Temporary software glitches can cause the keypad to become unresponsive.
Verify Battery Condition
- If the pump runs on battery, remove and reinstall the battery.
- Test with a known good battery if available.
- Why: Low voltage may prevent keypad scanning circuits from functioning correctly.
Check for Visible Damage
- Inspect the keypad for cracked or dislodged buttons.
- Inspect connectors at the keypad interface if externally accessible.
- Why: Physical damage or loose connections can interrupt button signals.
Test External Controls if Applicable
- If the pump supports external start/stop buttons or remote control, verify if those inputs work.
- Why: Confirms whether the issue is isolated to the keypad or systemic.
If the Problem Persists
- Remove the pump from service.
- Label as Out of Service.
- Send for internal bench evaluation or manufacturer repair.
Rationale: Continuing to troubleshoot internally may risk damage or void warranty. Knowing when to stop is proper troubleshooting.
Clinical Use Tip
- Do not attempt to troubleshoot the keypad on an active patient.
- Move the patient to another functioning pump before performing any work.
- Ensure any battery removal does not interrupt a current infusion.
Work Order Documentation (CCR Method)
CCR = Complaint, Cause, Resolution
Complaint
What was reported by the clinical staff.
Example:
“Pump keypad unresponsive; cannot start or adjust infusion.”
Cause
What was observed during troubleshooting.
Example:
“During troubleshooting, pump powered on, battery checked, keypad cleaned; no response from buttons.”
Resolution
What action was taken.
Example:
“Pump removed from service, labeled Out of Service, sent for repair.”
Helpful Details to Include
- Battery tested and/or replaced
- AC power tested
- Keypad physically inspected and cleaned
- Device restarted / power cycled
- Any external controls tested
Final Thought
Patient safety is paramount. Troubleshooting should follow a logical, stepwise approach, ruling out simple external issues first. Proper escalation and documentation preserve device integrity and hospital resources.
That is successful troubleshooting.