I guess what I should have stressed above is I know the lighter bow would benefit most, but will this make it more effective than the heavier bow I would say no as both would benefit from the research. The percentage of increase would probably go up more with the lighter bow than the heavier bow but both would probaly remain equal in seperation of capabilties. We use trocars in the operating room for abdominal cases. The one type has a blade that deploys when force is applied to the back of the trocar and enters the cavity with ease, represents the cut on contact head. The other type trocar we use is described as a dilating this trocar has a tanto chisel type tip and requires a rotating action to enter the abdomen and requires greater effort. The benefit of the later is it seperates tissue thus reducing future hernia’s at the trocar site. This would represent the tip and design of the single bevel.