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As reported, when the 80cm outback elite was attempted to be removed, there was some resistance ¿due to top of crotch¿.Some limited traction was given to the system, and the tip of the outback broke.The broken part was stuck halfway through the long sheath.The long sheath was removed in its entirety terminating the procedure.There was no reported patient injury.Originally, the patient presented with left superficial femoral artery (sfa) which required re-canalization via the right, possibly the left iliac which had signs of stenosis.The aortic bifurcation was noted to be somewhat steep but stretched reasonably after the placement of an unknown stiff wire and a 55cm 6f flexor sheath.The user was trained with the device.The device was opened in a sterile field.The outback was used as there was difficulty with the re-canalization and the user could not get re-entry.The outback went over the bifurcation, which was not too steep, to the distal end of the sfa under angio for positioning.As there appeared to be a ¿spontaneous fenestration¿, a microwire was attempted to be used without hitting the lumen of the outback.This did not work well with the outback in situ and therefore a catheter was attempted to be used.It was also noted that multiple attempts had to be made during the procedure, via ipsilateral antegrade puncture, and retrograde via the foot with the patient under sedation, as the patient could not lie still.The device will be returned for evaluation.
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As reported, when the 80cm outback elite re-entry chronic total occlusion (cto) catheter was attempted to be removed, there was some resistance ¿due to top of crotch¿.Some limited traction was given to the system, and the tip of the outback broke.The broken part was stuck halfway through the long sheath.The long sheath was removed in its entirety terminating the procedure.There was no reported patient injury.Originally, the patient presented with left superficial femoral artery (sfa) which required re-canalization via the right, possibly the left iliac which had signs of stenosis.The aortic bifurcation was noted to be somewhat steep but stretched reasonably after the placement of an unknown stiff wire and a 55cm 6f non-cordis sheath.The user was trained with the device.The device was opened in a sterile field.The outback was used as there was difficulty with the re-canalization and the user could not get re-entry.The outback went over the bifurcation, which was not too steep, to the distal end of the sfa under angio for positioning.As there appeared to be a ¿spontaneous fenestration¿, a microwire was attempted to be used without hitting the lumen of the outback.This did not work well with the outback in situ and therefore a catheter was attempted to be used.It was also noted that multiple attempts had to be made during the procedure, via ipsilateral antegrade puncture, and retrograde via the foot with the patient under sedation, as the patient could not lie still.One non-sterile outback elite 80cm re-entry unit was received for analysis inside a plastic bag.The device was unpacked to proceed with the product evaluation.The catheter shaft close to the distal tip was found separated.An unknown sheath introducer was returned with the distal portion of the separated shaft stuck inside the device.No other visible anomalies were observed during the analysis.Note: the outback elite catheters are packaged with the cannula deployed.A functional test could not be performed due the separated condition found on the returned device.Due the separated condition, an sem analysis was performed, and results showed that the separated area of the outer shaft of the outback elite 80cm re-entry unit presented evidence of elongations.Plastic deformation resulting in diameter reduction and tension marks were observed on the braid wires.Also, ductile dimples were found on the separated braid wire surfaces.The elongations found on the outer shaft material, the ductile dimples and plastic deformations resulting in a diameter reduction and tension marks, are commonly associated with separations caused by material tensile overload.Therefore, it is assumed that the outer shaft material was induced to a tensile force that exceeded the braid wire and outer shaft material yield strength prior to the separation.No other anomalies were observed during sem analysis.A product history record (phr) review of lot 17905306 revealed no anomalies or non-conformances during the manufacturing and inspection processes that can be associated with the reported event.The reported ¿cto catheter system withdrawal difficulty through guide/sheath¿ could not be confirmed since functional analysis could not be performed with the returned sheath due to the separated condition of the outback cto catheter.However, the reported ¿catheter tip/distal tip fractured/separated in patient¿ was confirmed due to the condition of the device received.The exact cause of the separation could not be conclusively determined during analysis.Based on the information available for review, it is possible that vessel characteristics (aortic bifurcation was noted to be somewhat steep) and procedural/handling factors contributed to the withdrawal difficulty experienced within the long sheath and the subsequent fracture/separation of the device.This is evidenced by the elongations found on the outer shaft material, the ductile dimples and plastic deformations resulting in a diameter reduction, and tension marks found at the separated area through sem analysis.These conditions are commonly associated with separations caused by material tensile overload; therefore, it is assumed that the outer shaft material was induced to a tensile force that exceeded the braid wire and outer shaft material yield strength prior to the separation.As cautioned in the information for safety provided in the instructions for use (ifu), ¿always visualize tracking of the catheter tip over the aorto-iliac bifurcation.If strong resistance is felt during catheter manipulation/delivery, determine the cause of the resistance before proceeding further.Consider using a 3¿4 mm balloon at low atm to dilate points of resistance, as needed, along delivery track.If the cause cannot be determined, withdraw the outback elite re-entry catheter.Excessive rotation, bending or kinking of the outback elite re-entry catheter may affect its performance.Withdraw the outback elite re entry catheter if it becomes excessively kinked.¿ neither the phr review nor the product analysis suggests that the event experienced by the customer could be related to the design or manufacturing process of the product.Therefore, no corrective/preventive action will be taken at this time.
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