WHILE DRIVING IN A SNOW STORM VEHICLE HIT A PATCH OF ICE, AND STARTED TO SLIDE, SPUN AROUND & WAS THEN REARENDED. UPON BEING REARENDED, DRIVER'S SEATBACK BROKE. DRIVER FELL BACKWARDS & LOST VISUAL CONTACT UNTIL VEHICLE STOPPED. VEHICLE TOWED TO SALVAGE YARD & WAS TOTALED. *AK