This needle is called "Shaho-shin" in Japanese and that means "Needle for dispersion. A tool introduced last time is also used for dispersion. The difference between these two is that this Shaho-shin is used to disperse moving "Blood" directly and the other one is used to disperse moving Ki (Qi).
Shaho-shin is used with the condition that the needle is inside the tube, hitting the head of the needle by the finger. The stimulation is strong but it doesn't penetrate the skin. This needle can be effective for the treatment for fracture, muscle tears, sprain of the joints, hemorrhage, etc.
I actually used this needle on my own injury so I will talk about that.
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