凡欲下针,先以左手大指,掐于穴上,掐令多时,令患人呼十息,然后用右手持针,用力之,取穴则有准,入穴既定,撒手停针十息,号曰天才,待少时再进针五分,根据前停针,住手十息,号曰地才,不可便起,少待一二时,方可出针,号曰人才,乃可泻也