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Asset Type
Sequential Compression Device (SCD)
Manufacturer
Model
What This Guide Helps With
Abnormal inflation/deflation timing, inconsistent cycle duration, or therapy not following expected sequence due to setup, garment, or external airflow issues.
Step-by-Step Troubleshooting
Ensure Patient Safety First
- Remove the device from active patient use before troubleshooting.
- Expected: Patient placed on alternate DVT prophylaxis.
Verify the Reported Issue
- Power on the unit and observe a full compression cycle from start to finish.
- Expected: Confirm irregular timing, skipped phases, or inconsistent inflation/deflation intervals.
- Why it matters: Ensures the issue is real and not normal variation in therapy modes.
Confirm Correct Therapy Mode/Settings
- Check that the correct mode and settings are selected (if applicable for model configuration).
- Expected: Proper therapy mode with consistent cycle pattern.
- Why it matters: Incorrect mode selection can appear as timing irregularities.
If corrected and timing normalizes → stop troubleshooting.
Check Garment (Sleeve) Application
- Ensure sleeves are properly applied, not twisted, folded, or overly tight.
- Expected: Even, smooth wrap around the limb.
- Why it matters: Improper application can affect pressure delivery and alter cycle timing.
If corrected and timing normalizes → stop troubleshooting.
Inspect Tubing Connections
- Disconnect and reconnect tubing at both the pump and garment ports. Ensure a secure fit.
- Expected: Tight, fully seated connections with no looseness.
- Why it matters: Airflow inconsistencies from loose connections can disrupt cycle timing.
If corrected and timing normalizes → stop troubleshooting.
Check for Kinks or Restrictions in Tubing
- Trace the full length of tubing and remove any kinks, compression, or pinching.
- Expected: Tubing is straight and unobstructed.
- Why it matters: Restricted airflow can delay inflation/deflation phases.
If corrected and timing normalizes → stop troubleshooting.
Inspect Garment and Tubing for Leaks
- Check for holes, cracks, or loose fittings. Listen for air leaks during operation.
- Expected: No audible leaks and intact components.
- Why it matters: Air leaks can prolong inflation time and disrupt normal cycle timing.
If leak found and corrected → stop troubleshooting.
Swap with Known-Good Garment and Tubing
- Replace sleeves and tubing with a verified working set.
- Expected: Cycle timing returns to normal.
- Why it matters: Confirms whether issue is accessory-related vs device-related.
If resolved → faulty accessory identified.
Observe for Consistency Across Multiple Cycles
- Run several cycles and monitor timing stability.
- Expected: Consistent, repeatable cycle timing.
- Why it matters: Intermittent timing issues may indicate developing internal faults.
If the Problem Persists
If all external causes have been ruled out and cycle timing remains inconsistent, the issue is likely internal (control board, timing circuitry, or internal pneumatic regulation).
Remove the device from service, label it Out of Service, and send for repair or bench evaluation.
Knowing when to stop is proper troubleshooting.
Clinical Use Tip
Do not troubleshoot while the device is in use on a patient. Always transition the patient to a functioning SCD before evaluating timing issues.
Work Order Documentation (CCR Method)
CCR = Complaint, Cause, Resolution
Complaint
What was reported by the clinical staff.
Example:
"SCD reported to have irregular compression timing and inconsistent cycle duration."
Cause
What was observed during troubleshooting.
Example:
"Faulty garment tubing causing intermittent airflow restriction affecting cycle timing."
Resolution
What action was taken.
Example:
"Replaced tubing and garment; verified normal cycle timing across multiple cycles."
Helpful Details to Include (If Known)
- Full cycle observed and timing behavior noted
- Therapy mode/settings verified
- Tubing inspected for kinks or restrictions
- Garment condition and fit checked
- Accessories swapped with known-good set
- No unusual noises or airflow inconsistencies
- Final device status (returned to service or sent for repair)
Final Thought
Cycle timing issues are often caused by airflow disruptions rather than internal failure. A structured approach that prioritizes simple external checks ensures patient safety and prevents unnecessary repairs. Clear documentation supports future troubleshooting and reliability tracking.
That is successful troubleshooting.