What type of needle is most extensively used in acupuncture?

The filiform needle is indeed the type of needle most extensively used in acupuncture. These needles are thin and flexible, allowing practitioners to insert them with precision into specific acupuncture points on the body. The design of filiform needles facilitates the stimulation of qi (energy flow) while minimizing discomfort for the patient. Additionally, they can be left in place during treatment for longer periods, enhancing the therapeutic effects of acupuncture.

Other needle types mentioned have different applications: for instance, arrowhead needles are primarily used for injecting substances rather than for therapeutic stimulation, round needles may not have the same precision as filiform needles, and blunt needles are not suitable for acupuncture as they do not penetrate the skin effectively. Thus, the filiform needle is clearly the preferred choice in the field of acupuncture for its effectiveness and patient comfort.