Operating room procedure was in process when the cast saw was plugged into the wall power outlet, which energized an onboard power unit that provides power to the cast saw from the vacuum portion at the base of the unit.A pair of cast spreader pliers that were tethered to the unit by a vinyl coated cable made contact with a prong on the cast saw creating a dead short.The tether cable heated and burned causing the tether to sever, dropping the pliers and opening the short.A small flame and smoke was seen which self extinguished immediately.Fda safety report id# (b)(4).
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