锋针即今三棱名，主刺瘤邪时气壅，发于经络痼不解，泻热出血荣卫通。
【注】四曰：锋针式图
[1]经之四曰：锋针者，取法于絮针，刃三隅，长一寸六分，
其上去八分，下留八分。
[2]刃三隅者，盖直壮而锐，可以泻热出血也。
[3]锋针即今三棱针，主刺时气温热瘤邪也。
[4]凡发于经络中壅痼不解之病，用三棱针之锋利，以泻热出血，
使经络开通，荣卫调和，而壅痼之疾愈矣。
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铍针之锋末如剑，主刺寒热两相搏，合而为痈脓已成，大脓一泻实时和。
【注】五曰：铍针式图
[1]经之五曰：铍针者，取法于剑锋者，广二分半，长四寸。
[2]其必广二分半长四寸如剑锋者，取其能开通也。
[3]铍针之锋如剑者，主刺寒热相搏，或邪气郁于荣卫，凝滞不通，
发为痈疽，其脓已成，用此开之，以取大脓。
[4]大脓泻则阴阳和，而痈热愈矣。
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员利形尖如氂，主治虚邪客于经，暴痹走注历节病，刺之经络实时痛。
【注】六曰：员利针式图
[1]经之六曰：员利针者，取法于氂针，微大其末，反小其身，
长一寸六分。
[2]其取法于氂者，以毛之强者曰氂，用其细健可稍深也。
[3]员利针，尖其形如氂，员而且锐，
主治虚邪客于经络而为暴痹与走注历节疼痛等病。
[4]以此刺之则经络流通，而虚邪自去矣。
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Fengzhen (Sharp Needle) is the modern three-edged needle, primarily used to puncture and treat neoplastic pathogens (tumors/pathological masses) and stagnation caused by seasonal epidemic qi. When pathogens manifest in the meridians and are stubborn and difficult to resolve, using Fengzhen to drain heat and bleed allows Ying (Nutritive Qi) and Wei (Defensive Qi) to flow freely.
[Note] Item 4: Diagram of the Fengzhen
[1] The Classic states: The Fengzhen is modeled after the cotton-picking needle, with a blade having three edges (triangular cross-section), one cun six fen in length.
The upper part extends eight fen from the tip, leaving the lower eight fen unsharpened.
[2] "Three edges" implies the blade is straight, robust, and sharp, suitable for draining heat and bleeding.
[3] Fengzhen corresponds to the modern three-edged needle, mainly used for puncturing conditions such as seasonal warm-heat pathogens and neoplastic pathogens.
[4] For any disease characterized by stagnation and stubbornness within the meridians, the sharpness of the three-edged needle is used to drain heat and bleed,
thereby opening the meridians, harmonizing Ying and Wei, and curing the stagnant and stubborn ailments.
The tip of the Pizhen (Broadsword Needle) resembles a sword, primarily used to puncture conditions where cold and heat struggle against each other, combining to form abscesses with pus already established; draining large amounts of pus restores harmony immediately.
[Note] Item 5: Diagram of the Pizhen
[1] The Classic states: The Pizhen is modeled after the edge of a sword, two-and-a-half fen wide, four cun long.
[2] Its dimensions of two-and-a-half fen wide and four cun long, resembling a sword's edge, are designed to facilitate opening and draining.
[3] The tip of the Pizhen being sword-like is primarily used to puncture conditions where cold and heat contend, or where pathogens stagnate in Ying and Wei, causing obstruction,
leading to carbuncles and sores with established pus; this needle is used to incise and extract large amounts of pus.
[4] Draining large amounts of pus harmonizes Yin and Yang, thereby curing the carbuncle and heat.
Yuanli Zhen (Round-Sharp Needle) is shaped sharply like yak hair, primarily treating deficiency pathogens lodging in the meridians, causing sudden bi-syndrome, wandering pain, and joint pain; upon needling, the meridians become patent and pain resolves instantly.
[Note] Item 6: Diagram of the Yuanli Zhen
[1] The Classic states: The Yuanli Zhen is modeled after the Mao needle, slightly larger at the tip and narrower in the body,
one cun six fen in length.
[2] It is modeled after Mao (yak hair); since strong hair is called Mao, its fine and sturdy nature allows for deeper insertion.
[3] The Yuanli Zhen has a sharp, round, and pointed tip resembling Mao,
primarily treating sudden bi-syndrome, wandering pain, and joint pain caused by deficiency pathogens lodging in the meridians.
[4] Needling with this instrument promotes the free flow of the meridians, causing deficiency pathogens to depart naturally.