The concerned device "senri" is a rapid-exchange (rx) type semi-compliant pta balloon dilatation catheter compatible to 0.018" guidewire (gw)."senri" has no approval in the us, however, we will report this case as an incident occurred on a similar device for "crosstella rx" (a rx-type pta balloon dilatation catheter, compatible to 0.018" gw) that is distributed in the us under 510(k) # k152873.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 visual test, 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.The actual device concerned was returned and investigated: the fractured distal part including the balloon was not returned.The outer shaft was fractured at the 90 mm from the gw port.The inner shaft was fractured at the 45 mm from the gw port.The inner and outer shaft were torn from the guide wire (gw) port to the broken part.The core wire was moved 140 mm from the predefined position (in the hub) to the distal side.Probable cause(s) and our comment: the balloon should have been injured with a sharp edge of the calcified lesion or another device(s) concomitantly used and was ruptured when inflated.While retrieving it out of the patient, the bulky portion of the ruptured balloon was caught at the legion and became unable to pull back further.A further attempt to forcibly pull back the device resulted in breakage of the shaft including the balloon.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 device handling-issues.
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