The gungnir was more of a spear / poleaxe, i think. and a sword is just a straight edge with a handle really. This thing seems like something else entirely. not that i haven't seen similar ideas. But i've never been able to peg them as an actual weapon.
Hmm, now that you mention it Odin did have more of a spear than a sword. Maybe it's a form of double bladed scythe? Although scythes usually have their ends sticking out away from them and not straight up, but it's a concept. xD