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What This Guide Helps With
Troubleshoots absent or intermittent bipolar output caused by accessory, footswitch, cable, connection, control, setup, or generator-related conditions.
Step-by-Step Troubleshooting
1. Protect the Patient and Maintain Surgical Continuity
Do not troubleshoot unreliable bipolar output while the patient depends on the ESU. Provide an alternate verified generator or approved surgical method before evaluating the affected unit.
Remove the Valleylab Force FX from clinical use if bipolar activation is intermittent or unpredictable.
Expected outcome: Patient care continues without depending on the affected bipolar function.
2. Confirm the Reported Bipolar Condition
Determine whether:
- Bipolar output never activates
- Activation is intermittent
- The generator indicates activation but tissue effect was absent
- The footswitch does not initiate bipolar output
- The problem occurs with one bipolar accessory or multiple accessories
- Cable movement changes the condition
Reproduce the complaint using appropriate test equipment rather than a patient.
Expected outcome: The complaint is defined as an activation, accessory, connection, or output-performance problem.
3. Verify Basic Generator Operation
Confirm normal startup, stable AC power, readable display, functioning controls, and absence of unrelated alarms or abnormal heating.
If monopolar operation is also reported as failed, treat the problem as a broader generator-output condition rather than a bipolar-only fault.
Expected outcome: The generator otherwise appears operational and the issue remains isolated to bipolar use.
4. Inspect the Bipolar Accessory
Inspect the bipolar forceps or other connected bipolar accessory for:
- Damaged insulation
- Bent or contaminated contacts
- Loose cable attachment
- Broken strain relief
- Fluid ingress
- Visible cable damage
Do not continue using a visibly damaged accessory.
Expected outcome: The accessory and cable are intact and properly connected.
If a damaged accessory is identified, substitute a known-good compatible accessory and retest.
5. Verify the Bipolar Connection
Confirm the bipolar accessory connector is fully inserted into the appropriate bipolar receptacle.
Inspect the external receptacle for contamination, looseness, bent contacts, or evidence that the connector will not remain securely seated.
Do not force incompatible connectors.
Expected outcome: The bipolar accessory seats securely and maintains a stable connection.
If reseating the connector resolves the problem and repeated testing remains stable, troubleshooting may stop after final verification.
6. Check the Footswitch When Applicable
If bipolar activation uses a footswitch:
- Inspect the footswitch and cable.
- Verify the connector is securely seated.
- Check for crushed cable sections, contamination, or damaged strain relief.
- Substitute a known-good compatible footswitch if available.
Expected outcome: Footswitch activation is consistent and produces the expected bipolar activation indication.
If a known-good footswitch restores normal operation, remove the failed footswitch from service and complete final testing.
7. Compare With a Known-Good Bipolar Accessory
Connect a known-good compatible bipolar accessory using the same generator setup.
Operate the ESU only into an approved electrosurgical analyzer or appropriate test load.
Expected outcome: Bipolar output activates reliably with the known-good accessory.
If so, the original accessory or cable is the likely cause and the ESU itself does not require further troubleshooting beyond verification.
8. Verify Bipolar Output With Approved Test Equipment
Use appropriate test equipment to verify repeatable bipolar output under controlled conditions.
Check for:
- Reliable activation
- Stable output response
- Normal audible and visual activation indications
- No dropout when the cable remains stationary or is gently repositioned
Expected outcome: Bipolar output is stable and repeatable during controlled testing.
If output remains intermittent despite known-good accessories, remove the ESU from service.
9. Perform Final Functional Verification
After correction, verify:
- Bipolar accessory connection
- Footswitch operation when applicable
- Stable bipolar activation
- Audible and visual indications
- Required output performance
- Required return-to-service safety checks
Expected outcome: Bipolar function is reliable and all required tests pass.
If all required tests are satisfactory, troubleshooting is complete.
If the Problem Persists
If known-good bipolar accessories and footswitches, secure external connections, proper setup, and controlled testing do not restore reliable bipolar operation, common external causes have been ruled out.
Possible remaining categories include an internal bipolar control circuit, generator output circuitry, connector assembly, or another service-level failure.
The ESU should be:
- Removed from service
- Labeled Out of Service
- Sent for repair or bench evaluation
- Evaluated using appropriate manufacturer documentation and approved test equipment
- Repaired or configured only by qualified personnel
Intermittent electrosurgical output is not acceptable for clinical use. Stopping external troubleshooting at this point is appropriate.
Return the unit to service only after successful repair and complete functional and safety verification.
Clinical Use Tip
Do not repeatedly attempt intermittent bipolar activation during surgery; move to a verified accessory or ESU before continuing patient treatment.
Work Order Documentation (CCR Method)
CCR = Complaint, Cause, Resolution
Complaint
What was reported by the clinical staff.
Example:
"OR staff reported intermittent bipolar activation from the Valleylab Force FX during use."
Cause
What was observed during troubleshooting.
Example:
"Clinical Engineering found a damaged bipolar accessory cable that caused output to drop out when the cable was repositioned."
Resolution
What action was taken.
Example:
"Replaced the defective bipolar accessory, verified stable bipolar output with an electrosurgical analyzer, and completed return-to-service testing."
Helpful Details to Include (If Known)
- Bipolar accessory type
- Footswitch used
- Connector condition
- Whether activation indication occurred
- Known-good accessory substitution results
- Known-good footswitch results
- Cable movement effect
- Analyzer test results
- Whether monopolar functions were normal
- Final device status
Final Thought
Bipolar failures should be isolated methodically by checking the accessory, cable, footswitch, connection, and controlled output before assuming an internal generator problem. Remove unreliable equipment from service, escalate appropriately, and document the verified findings.
That is successful troubleshooting.