The device has not returned for analysis at this time, which precluded a full investigation and analysis of the root cause.However, based on information received from the customer the event occurred as a result of user error.Tip shear has been identified as a potential risk whenever the applicator shaft is removed separately through the biopsy probe once it has been positioned in the probe aperture for marker deployment.Our mammotome vacuum assisted biopsy probes contain extremely sharp edges along the aperture opening to effectively excise tissue.Removing the applicator shaft once it is exposed to the probe aperture creates the possibility of the applicator catching on one of these edges and shearing.As a mitigation step to address this risk, we provide warnings and precaution language and instruction within the instructions for use: warning: failure to align the mammomark applicator as specified may result in improper deployment of the collagen plug and possible tip shear.Warning #10: remove the mammomark applicator and the mammotme biopsy probe together as a single unit from the site and obtain images to confirm marker placement.Retraining was conducted following the event.Follow up with the customer revealed that the patient has a papilloma and the tip will be removed at the time of the surgery.The surgery has not been scheduled at the time of this report.However, due to the subsequent procedure and pursuant to 21 cfr 803 we are submitting this medwatch report.
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