Blank fields on this form indicate the information is unknown, unavailable, or unchanged.Investigation - evaluation: a review of the complaint history, drawings, device history record, manufacturing instructions, quality control, and visual inspection / functional testing of unused product was conducted during the investigation.Eight unused sealed three-way stopcocks were returned for evaluation.The devices were visually examined for defects and tested for leaks.No visible cracks or device leakage were noted.A document-based investigation evaluation was also performed.There is no evidence to suggest the product was not made to specifications.Review of device history record shows no nonconforming events which could contribute to this failure mode.It should be noted there were no other reported complaints for this lot number.Based on the information provided and results of the investigation, a definitive root cause could not be determined.Measures have been previously conducted to address this failure mode.We will continue to monitor for similar complaints.Investigation - evaluation: a review of the complaint history, drawings, device history record, manufacturing instructions, quality control, and visual inspection / functional testing of unused product was conducted during the investigation.Eight unused sealed three-way stopcocks were returned for evaluation.The devices were visually examined for defects and tested for leaks.No visible cracks or device leakage were noted.A document-based investigation evaluation was also performed.There is no evidence to suggest the product was not made to specifications.Review of device history record shows no nonconforming events which could contribute to this failure mode.It should be noted there were no other reported complaints for this lot number.Based on the information provided and results of the investigation, a definitive root cause could not be determined.Measures have been previously conducted to address this failure mode.We will continue to monitor for similar complaints.
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