The customer reported that the needle had separated from the microtip.Needle separation was confirmed upon receipt of the handpiece.Due to the state in which the device was received functional testing could not be performed.The hypodermic needle had separated at the braze joint.This is the highest stress point along the length of the needle.There was no indication of severe side loading or contact with hard tissue.The immediate cause is material fatigue associated with and/or being caused by user error.It is suspected that non-axial motion by the user and bending of the needle during use contributed to the needle breaking.Lab testing, to date, has been unable to duplicate needle failure when appropriate axial technique is used in simulated use conditions, indicating the failure is not related to material defect.
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Per the information provided, this was the second time the doctor had used the device.He was doing a fibroma, working around the arch of the foot.The needle was bending a little bit and the needle broke.Cutting time at time of needle separation was 1:15 minutes.As the doctor removed the microtip from the patient's foot and he noticed that the needle was halfway out of the shaft.The needle did not lodge in the patient, it remained in the microtip as the device was removed from the patient.A second microtip was obtained and the procedure completed with that device.There was a 3 minute delay while devices were switched out and the patient was under general anesthesia.There was no harm, injury or complication to the patient caused by the failure.
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