The lot history for this product shows no issues related to the reported complaint.The cannula was returned in an opened pouch.The detached piece of cannula core was returned in a plastic container, sealed with a surgical glove.The detached core element is entirely cylindrical.The intact portion ends in a taper.Separation occurred at the junction of taper and small outer diameter section of the cannula core.The edges at separation are rough as having been torn.The cannula does not appear to have been struck or pinched as openings of both pieces remain round.A small curl in edge of detached cylindrical portion may be an indication of the cannula having been bent.A mechanical force could cause a portion of the device to break.Not enough information is available to determine a definite root cause, however the probable root cause is a mechanical issue.The review of the lot history, trend analysis, risk analysis and/or directions for use were considered acceptable, with the product performing within anticipated rates.No corrective action was deemed necessary.The patient is doing well.There is no report of a visual problem.The investigation is complete.
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