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What This Guide Helps With
Troubleshoots restricted pneumatic flow caused by kinked, compressed, twisted, obstructed, damaged, or incorrectly positioned external tubing and accessories.
Step-by-Step Troubleshooting
1. Protect the Patient Before Investigating Restricted Flow
Do not manipulate tourniquet tubing while the patient depends on active cuff pressure unless directed through the appropriate clinical procedure. Provide alternative equipment when technical troubleshooting is required. Expected outcome: The pneumatic path can be inspected without creating a patient hazard.
2. Confirm the Alarm and Affected Channel
Record the exact displayed condition, determine whether the restriction occurs during inflation, maintenance, or deflation, and identify the affected cuff and hose. Expected outcome: The reported condition is clearly defined and reproducible.
3. Trace the Entire External Hose Path
Follow the hose from the system to the cuff. Look for sharp bends, twisting, loops, compression, or tubing trapped beneath the patient, table, side rail, drape equipment, or accessories. Expected outcome: The hose has a clear, unrestricted path. If relieving an external restriction restores normal operation, verify function and stop.
4. Inspect the Hose for Permanent Deformation
Examine the tubing for flattened areas, internal collapse suggested by external damage, severe bends, or compromised connectors. Expected outcome: The hose retains its normal shape and shows no visible damage. Replace it if damaged.
5. Inspect the Cuff Tubing and Connection
Check the tubing at the cuff for folding, twisting, compression, damaged fittings, or stress at the connection point. Expected outcome: The cuff connection and attached tubing are unobstructed.
6. Verify Cuff Positioning
Ensure the cuff and hose have not been positioned so that the tubing is folded beneath the cuff or compressed by straps or other equipment. Clinical personnel remain responsible for proper patient application. Expected outcome: The cuff installation does not mechanically restrict the pneumatic path.
7. Substitute a Known-Good Hose
Connect a known-good compatible hose and approved cuff to determine whether the restriction follows the original external tubing. Expected outcome: Normal operation with the known-good hose identifies the original hose as defective.
8. Compare Channels if Appropriate
With the unit removed from clinical use, test the known-good external setup on another available channel when appropriate. Expected outcome: A restriction alarm isolated to one channel despite known-good accessories suggests an internal pneumatic-path or sensing problem.
9. Verify Inflation and Deflation
After correction, test inflation, pressure maintenance, and deflation using an approved test setup. Confirm no line restriction indication returns. Expected outcome: Pneumatic flow is normal through the affected channel. Troubleshooting can stop after successful verification.
10. Escalate an Unresolved Restriction Condition
If external tubing and cuff restrictions have been eliminated but the condition persists, do not open the pneumatic assembly or attempt internal valve repair. Expected outcome: The device is removed from service and referred for qualified bench evaluation.
If the Problem Persists
External hose routing, kinking, cuff positioning, and accessory damage have been ruled out. Remaining possibilities include an internal pneumatic restriction, valve issue, pressure-sensing problem, port fault, or other service-level condition.
Remove the unit from service, label it Out of Service, and evaluate it using appropriate manufacturer documentation and approved pneumatic test equipment. Internal repair or calibration should be performed only by qualified personnel.
Return the unit to service only after confirming normal inflation and deflation flow, pressure control, alarms, and any functions affected by the repair.
Clinical Use Tip
Route tourniquet hoses so they remain visible and free from compression by the patient, table hardware, positioning equipment, or surgical accessories.
Work Order Documentation (CCR Method)
CCR = Complaint, Cause, Resolution
Complaint
What was reported by the clinical staff.
Example:
"OR staff reported a line occlusion alarm when attempting to inflate a cuff with the A.T.S. 4000."
Cause
What was observed during troubleshooting.
Example:
"Clinical Engineering found the pneumatic hose sharply kinked where it passed beneath positioning equipment."
Resolution
What action was taken.
Example:
"Corrected hose routing, inspected the tubing for damage, and verified normal inflation and deflation without recurring alarms."
Helpful Details to Include (If Known)
- Exact alarm message
- Affected channel
- When restriction occurred
- Hose routing
- Kinks or compression found
- Cuff tubing condition
- Known-good hose test
- Comparison with another channel
- Inflation and deflation results
- Final device status
- Exact alarm message
- Affected channel
- When restriction occurred
- Hose routing
- Kinks or compression found
- Cuff tubing condition
- Known-good hose test
- Comparison with another channel
- Inflation and deflation results
- Final device status
Final Thought
A restriction alarm often begins with the external pneumatic path. Protect the patient, trace the hose completely, verify the cuff connection, prove the correction, and escalate if known-good accessories do not resolve the condition.
That is successful troubleshooting.