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What This Guide Helps With
Troubleshoots incomplete limb occlusion pressure measurement related to cuff setup, pneumatic connections, patient conditions, controls, or system-level faults.
Step-by-Step Troubleshooting
1. Protect the Patient and Separate Testing From Active Therapy
Do not perform technical troubleshooting of the measurement function while a patient depends on the same device for active tourniquet control. Use another verified system when needed. Expected outcome: Measurement troubleshooting can proceed without affecting necessary patient support.
2. Confirm the Exact Failure
Determine whether the measurement will not start, starts but aborts, fails to produce a value, or stops with a displayed message. Record the involved channel and cuff setup. Expected outcome: The stage at which the measurement fails is clearly identified.
3. Verify Normal Basic Operation
Confirm the A.T.S. 4000 powers normally, has completed startup, and does not show an unrelated system fault. Expected outcome: The unit is otherwise operating normally. If not, troubleshoot the primary system fault first.
4. Inspect Cuff and Hose Connections
Verify the cuff and pneumatic hose are securely connected and free from obvious leaks, kinks, or damaged fittings. Expected outcome: The pneumatic path is intact and unrestricted.
5. Verify Cuff Application and Condition
Confirm the cuff is appropriately secured, not folded or twisted, and has no visible damage. Clinical staff should confirm that cuff selection and patient positioning are appropriate for the measurement. Expected outcome: The cuff setup is mechanically suitable for an attempted measurement.
6. Check for External Conditions Affecting Measurement
Determine whether patient movement, cuff displacement, tubing compression, or other environmental or procedural factors are interrupting the measurement. Do not attempt to interpret or override clinical measurement requirements. Expected outcome: External interference is minimized and the measurement can proceed under stable conditions.
7. Use Known-Good Accessories
If the failure can be reproduced off the patient or during bench evaluation, substitute a known-good compatible cuff and hose. Expected outcome: Successful measurement with known-good accessories identifies an external accessory issue.
8. Verify Controls and Intended Mode Selection
Confirm the operator controls respond normally and the intended measurement function can be selected without changing restricted configuration or entering unauthorized service modes. Expected outcome: The function can be initiated through normal user-accessible controls.
9. Repeat Functional Verification Under Controlled Conditions
Using the appropriate approved test setup and manufacturer guidance available to Clinical Engineering, verify that the function initiates and completes normally. Expected outcome: The measurement function completes without abnormal interruption. Troubleshooting can stop when repeat testing is successful.
10. Escalate Persistent Measurement Failure
If the function still does not complete with known-good external accessories and normal controls, do not attempt internal sensor, pneumatic, or software repair without authorized procedures. Expected outcome: The device is removed from service and routed for qualified evaluation.
If the Problem Persists
Common external causes involving cuff setup, pneumatic connections, tubing restriction, movement, and accessory condition have been ruled out. Remaining possibilities include an internal sensing, pneumatic-control, software, configuration, or other service-level problem.
Remove the unit from service, label it Out of Service, and send it for repair or bench evaluation. Use appropriate Zimmer Biomet documentation and approved test equipment. Configuration or repair should be performed only by qualified personnel.
Before return to clinical use, verify the measurement function and all tourniquet functions affected by the evaluation or repair.
Clinical Use Tip
Do not rely on an incomplete or questionable limb occlusion pressure measurement when establishing clinical tourniquet settings.
Work Order Documentation (CCR Method)
CCR = Complaint, Cause, Resolution
Complaint
What was reported by the clinical staff.
Example:
"Staff reported that the A.T.S. 4000 began a limb occlusion pressure measurement but repeatedly stopped before producing a result."
Cause
What was observed during troubleshooting.
Example:
"Clinical Engineering found the cuff hose partially compressed beneath the table accessory, restricting the pneumatic path."
Resolution
What action was taken.
Example:
"Corrected the hose routing and verified the measurement function completed normally during controlled functional testing."
Helpful Details to Include (If Known)
- Exact displayed message
- Channel involved
- Whether measurement started
- Point at which it stopped
- Cuff condition and positioning
- Hose condition and routing
- Patient movement or environmental factors
- Known-good accessory results
- Control response
- Final measurement test result
- Final device status
- Exact displayed message
- Channel involved
- Whether measurement started
- Point at which it stopped
- Cuff condition and positioning
- Hose condition and routing
- Patient movement or environmental factors
- Known-good accessory results
- Control response
- Final measurement test result
- Final device status
Final Thought
An incomplete measurement should be approached through patient safety, cuff setup, pneumatic integrity, and environmental conditions before assuming an internal fault. Verify the correction completely and escalate when external troubleshooting is exhausted.
That is successful troubleshooting.