I once watched a show on the discovery channel about doing surgury on someone' s stomach with the laproscopic?sp tools. The tools have a trocar tip on the end to pierce the abodomen wall and they showed this from inside the body cavity after they had put air into the abdomen. The first thing I thought of was my Muzzy fixed blade heads. They said that this style tip needs very little pressure to pierce through the wall and was needed to keep from accidentally going too deep. Verry impressive show!!!