Visual and functional analysis was performed on the returned device.The reported signal calibration failure was unable to be confirmed due to the returned condition of the device (proximal tube and microcable separation).A review of the lot history record identified no manufacturing nonconformities issued to the reported lot that would have contributed to this event.Additionally, a review of the complaint history revealed no indication of a lot specific product quality issue.The investigation determined the cause for the reported signal calibration failure was related to operational context.The device was returned with a separation of the proximal tube and microcable, which prevented further functional testing of the guidewire.The separation was likely caused by the observed guidewire kinks.While the kinks were due to either use conditions(s) or the handling technique(s) employed, the separation likely occurred after use and from post-use handling or return shipping conditions.The observed kinks likely caused the reported issue, as damage to the guidewire can affect the pressure signal performance.There was also stretching to the distal tip coil, which was determined to be unrelated to the reported event.There is no indication of a product quality issue with respect to the design, manufacture, or labeling of the device.
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