(b)(4).Device evaluated by mfr: visual inspection shows an abnormal shape to the deployment array.The deployment shaft is peeling.Here is evidence of damage to the proximal end of the basket observed on multiple splines.Evidence of damage to multiple electrodes across all splines.The electrical test was performed and the device failed the test.Magnetic sensor resistance and inductance testing revealed both pairs are within specification.The manufacturing batch record review confirmed that the device met all material, assembly and performance specifications.The investigation conclusion is user / use error as there was an act or omission of an act that resulted in a different medical device response than intended by the manufacturer or expected by the user.The dfu states: "warnings:.¿ do not operate the catheter against resistance.If resistance is felt during advancement, retraction, articulation, deployment or un-deployment, stop and evaluate device location under fluoroscopy.¿ do not advance or retract the catheter through a sheath when deployed or articulated." and "precautions:.Always undeploy the catheter prior to removal from the patient.Use visualization (such as fluoroscopy) to verify undeployment.Always move the articulation control lever to its neutral position to straighten the catheter prior to removal from the patient.When used with a steerable guiding introducer sheath: ensure under fluoroscopy that the guiding introducer sheath distal end is straight or, if necessary, only minimally curved prior to advancing or retracting the catheter through the sheath.Do not articulate the sheath while the catheter array is inside the articulating section.Do not deploy or articulate the catheter while the distal end is inside a sheath.Remove the catheter in case of any observed malfunction." (b)(4).
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