Tubes used for dilating incision for minimally invasive portion of case were dirty on the inside with a residual substance.Instrument was contaminated and used on patient.Surgeon aware, instrument returned to sterile processing by main or sterile core coordinator.During procedure, particles appeared in the field when using the medtronic metrx dilator set.The instruments were ran through and cleaned.Sterile processing department (spd) swabbed inside of tube to check again (brown/ grey residue on the swab).Cleaned instruments numerous times and swab continued to come out with residue.Medtronic sent a loaner tray from another facility.Swab test showed same residue.Medtronic sent new set: swab test, few tubes had rust, and swab test on these and all others showed residue.Medtronic has filed a risk assessment.
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