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The actual device concerned was returned and investigated: the distal shaft was torn off at near the guidewire port, and the distal shaft from the broken part was missing.The outer shaft was elongated, and the proximal end of the core wire was misaligned forward.The device history records (dhr) of the device concerned was reviewed: the production lot, to which the device concerned belongs, passed all in-process inspections including the shaft-pressurized test and the balloon-wrapping test for every product, and the finished product inspections including the shaft tensile strength test and the repetitive balloon inflation/deflation test on representative samples based on sampling plan.No nonconformity or abnormality in the manufacturing processes of the device concerned was found.Probable cause(s) and our comment: the balloon was injured and ruptured while passing through and inflating in the heavily calcified lesion, the bulky distal portion of the ruptured balloon became difficult to be pulled back for retrieving the device out of the patient, and then, further attempts to withdraw forcibly the crosstella rx tore off the balloon and the inner shaft, and the torn-off distal portion of the crosstella rx was separated and remained in the patient's vessel.The cause of the guidewire port broken was not understood.No nonconformity or abnormality in the manufacturing processes of the device concerned was found, and accordingly, we determine that the event reported was caused by not any defect of the device but the user's handling issues.
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