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(b)(4).During processing of this complaint, attempts were made to obtain complete event, patient and device information.The device was not returned for analysis.The lot history record could not be reviewed and a similar incident query could not be performed because the product was not returned for evaluation and the lot number was not reported.The investigation was unable to determine a cause for the reported difficulties.It may be possible that the balloon rupture occurred due to interaction with the anatomy or associated devices during use causing damage to the outer surface of the balloon material resulting in the rupture under pressure.Additionally, the separation likely occurred during removal as the ruptured balloon material caught in the introducer sheath during removal.There is no indication of a product quality issue with respect to the design, manufacture, or labeling of the device.
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