The three-edged needle, a needle for bloodletting, presently made of stainless steel, being 2 cun long, is shaped in a round handle, a triangular head and a sharp tip.

• 三棱针是点刺放血的针具，目前所用的三棱针多为不锈钢制成，针长约2寸，针柄较粗呈圆柱形，针身呈三棱形，针尖锋利，三边有刃。