Device evaluated by mfr: the device was returned for analysis.The balloon was returned partially inflated with inflation medium within the balloon material.A visual and microscopic examination was performed on the balloon material.No damage was noted on the balloon material.The 6fr introducer sheath used during the procedure was returned for analysis.The entire length of the returned sheath was observed to be torn.A 6fr boston scientific sheath was used to complete the analysis as the returned sheath was torn.On analysis, a vacuum was applied and the balloon fully deflated.The device was successfully advanced through and withdrawn from the 6fr boston scientific sheath without any resistance or issues observed.A visual and microscopic examination on the blade was performed, it was noted that approximately 2mm of one of the blades was lifted from the balloon material.The pad was intact.This damage can potentially be a result of the resistance encountered during the withdrawal of the device.The remainder of the blade was undamaged and fully attached to the balloon material.All other blades were present and fully bonded to the balloon material.No issues were noted with the blades or pads that have contributed to the complaint incident.A visual and tactile examination on the shaft was performed, no kinks or damage along the shaft of the device were found.A visual and tactile examination on the markerband/tip was performed.No issues with the markerband or tip that could have contributed to the complaint incident were identified.The manufacturing batch record review confirmed that the device met all material, assembly and performance specifications.The investigation conclusion is user / use error as there was an act or omission of an act that resulted in a different medical device response than intended by the manufacturer or expected by the user.The dfu small peripheral cutting balloon cautions state: "if resistance is encountered when removing the catheter through an introducer sheath or guidewire through the catheter, stop and remove them as a complete unit to prevent damage to the guidewire, catheter, introducer sheath or vessel." (b)(4).
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