I don't know why you would need special weapons to use your chakra through a weapon. Chakra does pretty much everything. Like anything, it just takes training.

Asuma's weapons are specially made to channel chakra, but that probably just make it easier. But weapons like that are probably really rare, and you probably don't get them until you already have the ability to channel your chakra through a weapon. So you have to learn the ability with normal weapons first, then once you know how, you can get the "special" weapons that are better for using that ability.