Saitatsu is the Zanpakto and primay weapon of Haizo Aoi. It's full name in bankai is Chishioh Saitatsu.
Its command squence is Bleed
Saitatsu looks like a regular european sword/
Saitatsu is a large sythe with blades on both sides.
Saitatsu takes the form of a large european sword with wings at the guard and a pearl in the center of the guard and at the end of the handle. Haizo gets wings and a large tail.
The blade's spirit is the Saitatsu no Tokoyonokuni. It is a large dragon.