A dissection device (10) for dissecting tissue from an elongate structure in a body is disclosed. The device comprises an elongate tubular member (20) such as a cannula or other hollow tube (21 and an inflatable elongate tubular balloon (70) coupled to the elongate tubular member (20). The device further comprises means for connecting the elongate tubular balloon (70) to an inflation source to inflate the elongate tubular balloon (70) and means for deflating the elongate tubular balloon (70) such as by a deflation valve (30). The elongate tubular balloon (70) typically has multiple cylindrical chambers (73, 74), is inverted during its uninflated state and everts during use.
