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It was reported that during a transurethral lithotripsy procedure, approximately 10 minutes after fragmentation, a sudden crackling noise was heard coming from the device.Fragmentation could no longer be performed, indicating that energy was not being transmitted, and black burn marks was noted on the fiber connector.The fiber was replaced and the case was completed without patient complications.Analysis of the returned device identified an internal connector fracture.
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Upon receipt at our quality assurance laboratory, the returned fiber underwent a thorough analysis.The visual inspection concluded the fiber was received in one piece; there were no defects on fiber body.During the microscopic analysis it was observed that the fiber tip was in good condition.There was light exiting the connector face, indicating an internal connector fracture.The fiber was functionally tested, and results affirmed the aiming beam was dimmed and had a round shape.The device history record confirmed that the device met with all manufacturing specifications prior to distribution and there were no manufacturing deviations.The instructions for use (ifu) were reviewed and did not reveal any evidence of device off-label use or failure to follow instructions.The ifu mentions that inspect the fiber for kinks, punctures, fractures, or other damage.If the fiber appears damaged, do not use the fiber; return it to the supplier for replacement; and, hold the fiber tip to a non-reflective surface, and ensure that a circular red/green spot appears.If the spot is not circular, cleave the fiber.If the spot is weak or not visible, discard the fiber or return it to the supplier for replacement.A risk review was completed and confirmed that the reported allegation of connector overheating of device or device component, fiber device operates differently than expected and connector fractured were defined in the risk documentation.This event type has been accounted for during product risk analysis to support acceptable risk benefit for the product.It is probable that the internal connector fracture of the fiber occurred during procedural handling of the fiber during setup or use.Based on the information available, a conclusion code of cause traced to component failure was assigned to this investigation as an expected or random failure was identified without any design or manufacturing issue.
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