Stryker LUCAS 3

Compression Stops, Weak Compression, Or Drive Mechanism Fault

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Asset Type

Mechanical CPR Device

Manufacturer

Stryker

Model

LUCAS 3

What This Guide Helps With

Troubleshooting interrupted, weak, or abnormal LUCAS 3 compression performance before escalating for repair.

Step-by-Step Troubleshooting

Ensure Patient Safety First

If the LUCAS 3 stops compressing, compresses weakly, or shows a drive-related fault during patient use, clinical staff must immediately resume manual CPR according to facility protocol.

Do not continue relying on the device if compression depth, rhythm, or piston movement appears unreliable.

Expected outcome: Patient circulation support is maintained without depending on a questionable mechanical CPR device.

Remove the Device From Active Use When Safe

Once patient care has been transferred to manual CPR or another approved method, remove the LUCAS 3 from the patient area for Clinical Engineering evaluation.

Expected outcome: Troubleshooting is performed away from the active patient care event.

If the issue occurred during an active code, document the reported behavior clearly.

Confirm the Reported Symptom

Power the LUCAS 3 on and observe the startup behavior.

Check whether the issue is:

Expected outcome: The reported failure is confirmed or identified as intermittent.

Check Battery Charge and Seating

Remove and reinstall the battery, ensuring it is fully seated and latched.

Check the battery charge indicator.

If available, test with a known-good charged LUCAS 3 battery.

Expected outcome: The device powers normally and runs without compression interruption.

If battery replacement resolves the issue, remove the suspect battery from service and stop troubleshooting the device.

Check External Power Supply and Charging Accessories

Inspect the external power supply, power cord, charger, and battery charger contacts for damage, looseness, contamination, or missing components.

Verify that the battery charges normally in the approved charger or through the device if applicable.

Expected outcome: Power accessories are ruled out as the cause of low power or unexpected shutdown.

Inspect the Device for Physical Damage

Look for cracks, impact marks, bent components, loose hardware, broken hooks, damaged legs, or signs that the device was dropped.

Pay close attention to the upper housing, support legs, back plate connection points, and piston area.

Expected outcome: No physical damage is present that could affect compression alignment or drive movement.

If damage is found, remove the device from service and send it for repair or manufacturer evaluation.

Verify Correct Assembly With the Back Plate

Attach the LUCAS 3 to its back plate and confirm both support legs lock securely.

Check for poor latching, uneven engagement, or movement between the upper unit and back plate.

Expected outcome: The upper unit attaches firmly and remains stable.

Why it matters: Poor mechanical alignment can affect compression position, force transfer, and device stability.

Inspect the Suction Cup and Piston Area

Check the suction cup for tears, deformation, improper attachment, contamination, or stiffness.

Inspect the piston area externally for debris, fluid residue, dried cleaning agent, or obstruction.

Expected outcome: The suction cup and piston area are clean, intact, and able to move without visible restriction.

If the suction cup is damaged or worn, replace it according to facility policy and retest.

Check for Obvious Obstruction or Binding

With the device off and removed from any patient use, visually inspect for anything preventing normal piston travel.

Do not force the piston, open the housing, or disassemble the drive mechanism.

Expected outcome: No external obstruction is present.

If binding, grinding, or restricted movement is suspected, stop troubleshooting and escalate.

Run a Controlled Functional Check

In a safe bench setting, power the device on and initiate a functional test according to facility procedure.

Observe compression startup, piston motion, sound, alerts, and whether the device stops unexpectedly.

Expected outcome: Compression motion is consistent, strong, and free of abnormal noise or fault indicators.

If the device completes the check normally, document the result and consider whether the original issue may have been related to battery charge, setup, patient positioning, or accessory condition.

Listen for Abnormal Drive Sounds

During testing, listen for grinding, clicking, straining, slipping, rattling, or sudden motor speed changes.

Expected outcome: The motor and drive sound smooth and consistent.

If abnormal sounds are present, remove the device from service. This may indicate an internal drive, motor, gear, or compression mechanism issue.

Check for Heat, Odor, or Electrical Warning Signs

Inspect the housing and battery area for unusual heat, burning odor, melted plastic, or discoloration.

Expected outcome: No heat, odor, or electrical damage is present.

If any of these are found, stop testing immediately and label the device Out of Service.

Review Error Indicators or Device Logs if Available

Check displayed alarms, indicators, or stored event/service information according to approved Clinical Engineering workflow.

Note any recurring drive, compression, battery, motor, or service-related faults.

Expected outcome: Fault information supports the observed symptom and helps determine whether repair escalation is needed.

Retest With Known-Good External Components

If the device behavior is intermittent, retest using:

Expected outcome: The issue either follows an accessory or remains with the device.

If the issue follows an accessory, remove that accessory from service. If the issue remains with the device, escalate for repair.

Return to Service Only if Fully Verified

Return the LUCAS 3 to service only if it passes operational checks, has no active faults, shows normal compression operation, and has no signs of mechanical damage.

Expected outcome: The device is confirmed safe and ready for emergency use.

If there is any doubt about compression strength or drive reliability, do not return it to service.

If the Problem Persists

If the LUCAS 3 continues to stop compressions, produces weak compressions, shows a drive mechanism fault, makes abnormal drive noise, or fails functional testing after battery, accessory, setup, and visible obstruction checks, the likely cause is internal.

The device should be:

Knowing when to stop is proper troubleshooting. A mechanical CPR device must not be returned to service unless compression performance can be trusted.

Clinical Use Tip

Do not troubleshoot a LUCAS 3 while it is being relied on for active patient compressions. If the device stops or compressions appear weak, clinical staff should immediately switch to manual CPR or another approved resuscitation method before Clinical Engineering evaluates the device.

Work Order Documentation (CCR Method)

CCR = Complaint, Cause, Resolution

Complaint

What was reported by the clinical staff.

Example:
"Clinical staff reported that the Stryker LUCAS 3 stopped compressions during use and displayed a drive-related fault."

Cause

What was observed during troubleshooting.

Example:
"Clinical Engineering verified normal battery seating and accessory condition, but the device produced intermittent compression stoppage and abnormal drive noise during bench testing."

Resolution

What action was taken.

Example:
"LUCAS 3 was removed from service, labeled Out of Service, and sent for repair evaluation due to suspected internal drive mechanism fault."

Helpful Details to Include (If Known)

Final Thought

For a mechanical CPR device, compression reliability is the safety function. Clinical Engineering should rule out simple external causes first, including battery condition, accessory fit, back plate attachment, suction cup condition, and visible obstruction. If compression motion remains weak, inconsistent, noisy, or faulted, escalation is the correct repair decision. Accurate CCR documentation helps preserve the details of a high-risk failure event.

That is successful troubleshooting.

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