During a stroke, opened a 4.0mm spiderwire 320/190cm to prep for distal protection.Brought the filter back into the green housing underwater to prevent air bubbles in the filter basket, everything seemed to have gone back smoothly.Went to advance the filter wire into the sheath and up into the patient when the doctor noticed that it was not advancing smoothly anymore, removed the filter wire and sheath housing from the patient.When examining the filter wire, noticed that the wire poked through the sheath housing and was defective.There was no patient harm.A new filter wire was opened and prepped in the same way and advanced smoothly and the case continued.
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