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[Shape and functions of shear needle in Internal Classic].

The shape of shear needle mentioned in Internal Classic was explored according to the available documents and the unearthed relics. And the functions of shear needle were studied as well. It is held that the initial shape of shear needle is the imitation of plowshare. Its head is wide and flat, which is similar to a triangle. And it's base and a hypotenuse form an acute angle with narrow and sharp blades. The blade of the base and the tip of the acute angle is considered as the site of action, which can be applied for fast and superficial insertion or cutting at the local area. It can protect the body from damage of interior tissues, and at the same time, has the function of clearing heat.