|
The radiopaque tip portion of the guidewire became kinked during use.The physician continued to use the kinked guidewire, drawing the kinked portion of the wire into the guide catheter, then advancing the wire distally.The tip fracture was observed after the wire was used to cross the lesion.The user facility provided fluoroscopic images that clearly show the guidewire successfully crossing a lesion with no apparent kinks; after the vessel was dilated, the guidewire became positioned in a tight configuration.A lesion in a second vessel was then approached using the same guidewire with a whisper extra support guidewire used as a "buddy wire".The galeo pro guidewire is clearly seen in the fluoroscopic images with no kinks at this point.Both the whisper es and the galeo pro guidewires were then withdrawn into the guide catheter; a kink was clearly visible in the radiopaque portion of the galeo pro in the next images when the guidewire was once again advanced out of the guide catheter.The kink in the galeo pro guidewire appears to become more pronounced in the following images when both the whisper and galeo pro guidewires were once again used to cross the lesion.After the guidewires were withdrawn a possible vessel spasm is clearly visible just distal to the stenosis, as is the fractured and detached portion of the galeo pro distal tip.Six days later the physician attempted to retrieve the galeo pro tip fragment.When the guidewire tip fragment could not be retrieved, the physician finally opted to place a stent to immobilize the tip fragment by trapping it against the vessel wall.The potential for kinks and other types of guidewire deformations are well-known for all types of coronary guidewires.The galeo pro coronary guidewire instructions for use clearly advises the user to be aware of this possibility, including the following warning statements: "never push, torque, advance, withdraw or auger the guidewire against resistance without first determining the cause of the resistance under fluoroscopy before taking remedial action.Excessive force against resistance may cause damage and/or fracture which may result in separation of the distal tip" and "always pay attention to the free movement of a guidewire in a coronary artery.Do not move a guidewire without observing the resultant tip response".The user is warned to remove the guidewire and the guide catheter as a single unit if strong resistance is encountered or if the guidewire becomes entrapped within the vasculature.The fluoroscopic images from this procedure clearly show that the physician continued to use the guidewire despite the visible kink.The images also clearly show that, after the kink occurred, the distal tip of the wire was not advancing properly in response to the physician's efforts to advance.The presence of a kink in an unsupported portion of the wire (i.E., the distal portion of the wire outside the guide catheter) greatly reduces the ability to transmit axial forces along the entire length of the guidewire.Although it is unclear from the images whether the galeo pro tip became entrapped in the apparently spasmed portion of the vessel, this could have contributed to the detachment of the guidewire tip.The actual device was not returned for analysis, so it is not possible to examine and analyze the characteristics of the fractured surface to further understand the failure mode.Production records for the manufacturing lot were examined and no failures or anomalies were present.Therefore, given the fluoroscopic images, the description of the event provided by the user, and the content of the device labeling it is most likely that the guidewire met its design specifications and the cause of this event was operator error (failure to observe warnings provided in the device labeling and to take appropriate actions as recommended in the instructions for use.
|