1 this product is a.
The use of this instrument is B.
There's something wrong with this. What do you mean by "this instrument" in product A, 2? I don't know.
If this instrument refers to product A, combine your question. I think you can describe it like this:
1, the product is a.
2. A method for realizing xxx (specifically, here refers to the technical effect that can be achieved with A), characterized by comprising:
As follows, a series of technical features of product A are introduced to describe it, and the exclusive right and subordinate right of product A are effectively combined to explain it.
Secondly, if only one part is described, the manual should provide a complete technical scheme of the whole mechanical device as a support. Not only that, but also the protection should be strengthened, including the exclusive rights of this part.