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(b)(4).Investigation - evaluation: a review of the complaint history, drawings, device history record, documentation, instructions for use (ifu), specifications,, quality control and visual inspection of the returned device was conducted during the investigation.The device is shipped with an instruction for use (ifu) that describes the intended use, specific items are addressed such as: do not exceed rated burst pressure and do not use a power injector for balloon inflation or injection of contrast medium as rupture may occur.The ifu also states, if balloon pressure is lost and/or balloon rupture occurs, deflate balloon and remove balloon and sheath as a unit.The nominal inflation for this device is 8 atm and the rated burst pressure is 11 atm.End user reported that the pressure used exceeded the labeled burst pressure.The returned balloon was inverted suggesting that the physician attempted to withdraw the balloon through the competitor sheath.After rupture, attempts to remove through an introducer/sheath (against the ifu) would be difficult as the balloon cannot be fully deflated, making rewrap more difficult on a balloon.A balloon that burst circumferentially has an even more difficult time with rewrap, which increases the potential for separation.The device is designed to burst linearly.However, a balloon may burst or tear circumferentially due to angulation or calcification.Calcifications can have unexpected sharp protrusions which can damage the balloon and contribute to burst or tear.It is unknown whether there was any vessel calcification.There is no evidence to suggest the product was not made to specifications.Review of device history record shows no nonconforming events which could contribute to this failure mode.It should be noted there were no other reported complaints for this lot number.Based on the investigation evaluation, the failure mode was likely caused by off label use of the device.We will continue to monitor for similar complaints.Per the quality engineering risk assessment no further action is required.
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