The results of our investigation: 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 for every product, and the finished product inspections on representative samples based on sampling plan.
No nonconformity or abnormality in the manufacturing processes of the device concerned was found.
As a result of the concern device investigation: the balloon was circumferentially ruptured and detached at 92 mm from the posterior end of the balloon.
(balloon length: 200 mm) the inner shaft (gw lumen) was broken at 395 mm from the gw port.
(distance from tip to gw port section: 400 mm).
Based on our investigation of the concern device, we inferred that one distal ring marker, the distal balloon (approximately 100 mm), the distal tip, and part of the inner shaft (gw lumen), may have remained in the patient's body.
Probable cause(s) and our comment: no nonconformity or abnormality in the manufacturing processes of the device concerned was found.
Factors that may contribute to the balloon rupture and the stuck include, but are not limited to the following.
Balloon rupture occurred due to balloon dilation of a highly calcified lesion.
The lesion trapped the tip of the balloon, and it was presumed that the inner shaft and balloon were separated when the tip was released from the trap and the balloon was attempted to be removed.
Based on the above, it is inferred that this incident was caused by the lesion, and it is judged that there were no problems with the manufacturing or design of the device.
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The product was used for treatment of the posterior tibial artery.
The patient was a dialysis patient with strong calcification and balloon dilatation was insufficient even when balloon pressure was increased up to the rbp.
Considering the possibility of catheter breakage, the doctor tried various methods to remove the snagging at the distal tip without further removal of the catheter.
However, the distal tip snagging could not be released at all, and while trying various methods, the balloon portion became detached, leaving an estimated 10 cm of the balloon portion and the tip portion remaining inside the body.
It was determined that the product remaining in the body could not be recovered, and the plan was to monitor the blood flow through the body on a follow-up basis.
The anterior tibial artery was treated on the same day, and blood flow was still flowing to the fingertips.
The patient had been discharged from the hospital.
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