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The catheter was returned and is clean.It was not used on a patient.A longitudinal tear in the balloon was confirmed.The cause could not be identified through microscopic inspection.A comparative catheter was tested for rated burst pressure.It was the same catalog number / size as the complaint catheter, but a different lot number.The balloon was immersed in a body temperature water bath and inflated in 0.5 atm increments until failure.The balloon tore in a longitudinal manner at 3.5 atm, which is well above the labeled rated burst pressure of 2.0 atm.As per the instructions for use, an inflation device with pressure gauge should be used on the device to monitor pressure.In this case, an inflation device with pressure gauge was not used, making it impossible to determine how much pressure was applied to the balloon before it burst.
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As per the report from the user facility / distributor - during positive balloon preparation as indicated in the ifu, the physician filled the balloon with contrast/saline mixture (ration unknown) to a "soft" dilated state with either a 30 or 60cc syringe.Upon "pullback" to expel air, the physician noted that the balloon burst.The nature of this burst was not known.The catheter shaft was not kinked.A 611937 pdc537 was used to complete the procedure.It is unknown at what pressure the balloon ruptured.
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