The complaint stated: ¿a black residue/stain was left inside the patient after using the blades.¿ the inner edgeform blades were grasped between, rotated and wiped on paper.Two light but visible tracks of fine grey particulate remained on the paper.The used two had more noticeable particulate mixed with bio substance.The new blade left lighter, but visible shading.The product was all tested and performed as expected.There were no abnormalities noted.The sluff chamber, both blades and tips had no outstanding observations.The blade connected, ran in forward, reverse and oscillating.It switched between modes with no issue.There were no error messages indicated on the control panel.The complaint was assigned to engineering for further evaluation.Per engineering: the effects observed are consistent with the effects warned against in the instruction for use when the device instructions are not followed.Based the results of the investigation, no further action is warranted at this time.
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