The reported event was confirmed however the cause was unknown.The product had caused the reported failure.The sample was evaluated and observed the stent received did not had a double pigtail.The stent straightener could be moved around the stent.The cause of one of the end stent was not in coil position or no double pigtail observed on returned stent.How and when the problem was occurred could not be determined.A potential root cause for this failure mode could be due to the defect component from the supplier or user related or mishandling the product.The device history record was reviewed and found nothing that could have caused or contributed to the reported event.The instructions for use were found adequate and state the following: "[warnings] 1.Method for use (1)when using the multi-length type stent, it should be avoided in the following cases.1)if you measure the length of patient¿s ureter and confirm that excessive coil part would be appear , consider using other stent which has different shape of tip and length.Ureteral stents with excessive coil part shave risks of knot formation at the tip of renal pelvis side during placement or removal.2) if any resistance is felt during removal, confirm the cause of the resistance with fluoroscopy and take remedial action to solve the problem.Excessive force during removal may lead to damage of the renal pelvis and or ureter.(2) ureteroarterial fistula may be formed between the ureter and the aorta or the iliac artery and result in massive hemorrhage at the replacement of the ureteral stent if a ureteral stent is placed for a long term in a patient who has undergone the intrapelvic surgery or irradiation.Therefore, carefully monitor the condition of the patient, and in the event of acknowledging bleeding from the urethra, perform retrograde pyelography or angiography, and provide appropriate care." h11:section a through f - the information provided by bd represents all of the known information at this time.Despite good faith efforts to obtain additional information, the complainant / reporter was unable or unwilling to provide any further patient, product, or procedural details to bd.H3 other text : the actual/suspected device was inspected.
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