A visual and dimensional inspection were performed on the returned device.The reported material separation and material twisted / bent (bunching) was confirmed.The reported difficult to advance could not be tested due to the device condition.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 identified no other incidents/complaints from this lot.The investigation was unable to determine a conclusive cause for the reported difficulties.Factors that may contribute to difficulty advancing the balloon catheter over the wire include, but are not limited to, inner diameter of the catheter, outer diameter of the guide wire, device support, buildup of procedural contaminants, user technique, and/or damage to the catheter or guide wire.In this case, analysis of the returned wire noted bunched polymer coating, it is possible that the guide catheter interacted with the wires polymer coating, resulting in the reported difficulty during advancement and subsequent polymer bunching and separation.There is no indication of a product quality issue with respect to manufacture, design, or labeling.
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