User blog comment:Xilinoc/Ch. 591 - Marching Out the ZOMBIES 2/@comment-24282510-20140731035626/@comment-5398287-20140731042823

I, uh...

Hitsugaya's Bankai isn't his sword, it's his ice wings and stuff, which he can easily regenerate.

And the Zanpakuto itself can be easily mended by pouring Reiatsu into it.