This invention discloses a cannula comprising an elongate shaft comprising a distal region and a proximal region and defining a lumen therebetween, and further comprising a wall defining at least one lateral aperture therethrough and a distal end defining at least one distal aperture. The distal region comprises an electrically exposed and conductive distal tip and the outer surface of the cannula between the distal tip and the proximal region is non-conductive.
