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The user facility reported that two of the navicross radiopaque markers came off the device during use and remained in the patient.Additional information was received on june 3, 2019.Per health canada report ((b)(4)): "during procedures endovascular for (iliac stenting) two separate radio opaque markers came off, two different navicross support catheters into the patient." additional information was received on june 26, 2019.The incident was regarding two navicross catheters to the same patient.No surgical intervention was required to treat the patient for the radio opaque markers.After the second navicross catheter lost its radio opaque markers, they switched to a different product.A cook medical j-wire, guide wire or benson wire was being used along with the navicross.
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The actual sample was received for evaluation.Visual inspection revealed that the radiopaque marker was missing in its place at approximately 41mm from the distal end of the device.Magnifying and electron microscopic inspections of the section where the radiopaque marker was missing revealed that there was an impression, which implied that the radiopaque marker had been fixed on the shaft.Some abrasions were noted on the section adjacent to the section where the radiopaque marker had been fixed.These abrasions are likely to have been generated when the radiopaque marker was dislodged from its place, implying that the actual sample was exposed to excessive frictional force on this section.Magnifying inspection of the outer surface of the shaft along the total length and the lumen at the distal end of the shaft and at the proximal end of the hub.The distal end of the shaft was found to have been deformed.This deformation implies that the distal end of the shaft came into contact with a hard object, including a sensed section of the lesion.The outside and inside diameters were measured on the undamaged segment and confirmed to meet manufacturer specifications.Ifu states: carefully handle the product under fluoroscopy.If any resistance is felt while handling the product, immediately stop the manipulation and find out cause of the resistance in order to avoid damage to blood vessels and separation or breakage of the product.Thank you very much for your continued support.Based on the provided information and investigation results, there is no definitive evidence that this event was related to a device defect or malfunction.It is likely that the actual sample came into contact with a hard object, including a stenosed section of the lesion and trapped by it on the section adjacent to the radiopaque marker.Subsequently, in this state, pulling force within the elastic region was applied to the shaft.Consequently, the shaft became stretched temporarily with the radiopaque marker being subjected to frictional force at the same time, resulting in the dislodgment of the radiopaque marker.However, the exact cause of the reported event cannot be definitively determined based on the available information.
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