(b)(4).The returned zero tip basket was analyzed, and a visual evaluation noted that the basket was in a open position when returned.One basket wire was detached from the knot and was not returned.Also, the sheath was bent at the distal end.Functional inspection found the basket will open and close normally.The reported event that the device could not be used was confirmed.Based on all available information, it is possible that operational factors such as excess of force applied, manipulation/interaction with other device or a stone, and possibly a cut with a sharp tool could have caused the issue found.Furthermore, sheath kinked could have been cause due to handing/manipulation, or interaction with other device.Therefore, the most probable root cause is adverse event related to procedure.A review of the manufacturing documentation for this device revealed that no anomalies or deviations related to the event occurred during manufacturing.
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