Final device investigation found that the device was returned with a pronounced bend in the shaft and damage to the insulation.Upon evaluation, the device passed mechanical testing - the jaw fully opened and closed and was able to pass the cut test.The device then was electrically tested and failed the insulation test.Under magnification, the insulation appeared rough and had marks were it may have been scraped or damaged.At one point, metal could be seen inside one of the scrape marks.The device history record was reviewed, and no discrepancies were noted.As each device is visually inspected and functionally tested prior to release, no conclusion could be made as to what may have caused the reported event.
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