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This page describes products and general use; it is not medical advice.
A suture needle is the metal needle that carries suture material through tissue. Needles are described by four features: how the suture is attached, the curvature, the size, and the design of the point and body. This guide explains each feature, compares the common point types in one table, and shows how to read a needle description on a product record.
Who uses it: surgeons, surgical and veterinary teams, and the clinic staff, buyers and students who need to read a suture or needle specification.
What a suture needle is
A suture needle is a surgical needle used to pass suture through tissue. In United States regulation, a “disposable or reusable suturing needle” is named in the identification of the manual surgical instrument for general use in 21 CFR 878.4800. That regulation classifies the device as Class I (general controls) and exempts it from the premarket notification procedures in subpart E of part 807, subject to the limitations in 878.9 (text via Cornell Law School’s Legal Information Institute, checked 2026-10-30). Needles made for a single specialty can be classified elsewhere in the CFR; for example, the neurosurgical suture needle is classified in 21 CFR 882.4650 as Class I (general controls).
How a suture needle is built
The University of Saskatchewan veterinary skills course (WCVM VSAC, checked 2026-10-30) states that most surgical needles are made of stainless steel and should be sharp enough to penetrate tissue, strong enough to resist bending and flexible enough to resist breaking. It describes needle design as varying by four things: method of suture attachment, shape and amount of curvature, size, and point design.
Swaged versus eyed
- Swaged: the suture is permanently attached to the needle. The course describes these as consistently sharp, convenient because no threading is needed, and “generally preferred”.
- Eyed: the suture is threaded through an eye at the time of use. The course describes eyed needles as reusable and economical, but less efficient and more traumatic (a double strand is pulled through tissue).
Suture needle types by point and body
Needle bodies are either round or cutting. The table combines two independent sources: a manufacturer fact sheet (KRUUSE Suture Needles Fact Sheet, 06/2016, a veterinary supplier) and the University of Saskatchewan course. Both are veterinary materials, so the tissue uses below are as stated by those sources, not clinical recommendations. A dash means the source does not state it.
| Needle type | Cross-section and cutting edge | Use as stated by the source |
|---|---|---|
| Taper point (round bodied) | Round body, sharp tip; penetrates without cutting | KRUUSE: the most common tip of round bodied needles, with tissue-preserving penetration. USask: viscera, muscle and light fascia; not dense tissue such as skin, where extra force can bend the needle. |
| Taper cut (tapercut) | Round body with a cutting tip | KRUUSE: easy penetration in tough tissue with little tissue trauma. USask: delicate and dense tissue. |
| Conventional (traditional) cutting | Triangular; cutting edge on the inside of the curve | USask: generally replaced by reverse cutting. KRUUSE: cuts with the inner curve. |
| Reverse cutting | Triangular; apex cutting edge on the outside of the curve | KRUUSE: facilitates tissue penetration. USask: skin and tougher tissues, preferred by most surgeons. |
| Trocar point | Very sharp tip; KRUUSE trocar point needles are straight | KRUUSE: often used in the skin. |
| Micropoint spatula | Flat, thin, extremely sharp cutting edge | KRUUSE: ophthalmic needle for penetrating between layers of scleral or corneal tissue. |
In short, KRUUSE summarises that cutting needles cut cells and are often used in fibrous tissue such as fascia and skin, while round needles push cells aside and are used in soft-tissue surgery such as bladder and intestine.
Needle curvature
Needles range from straight to curved. According to the University of Saskatchewan course, straight needles are used near the surface (primarily skin) and passed with the fingers, while curved needles are handled with a needle holder (see Castroviejo needle holder for one example). Curvature is described as a fraction of a circle: 1/4, 3/8, 1/2, 5/8 and so on, and the most common curves are 3/8 and 1/2. Wider curves are described as useful for thick tissue or deep, poorly accessible sites. KRUUSE lists its shapes as 3/8 circle, 1/2 circle, compound curve and straight, and notes that most of its 1/2 circle needles are round bodied and most of its 3/8 circle needles are reverse cutting. That pairing is that manufacturer’s range, not a general rule.
Reading a needle description
Product records combine these features in a short code. The Nurolon suture record lists a 26 mm SH taper-point needle, and the Ethibond record shows how a needle may be listed with or without a standard needle attached. Read a description in this order:
- Attachment: swaged (suture attached) or eyed.
- Point and body: taper, taper cut, cutting, reverse cutting, trocar or spatula.
- Curvature: straight, or a fraction of a circle.
- Length and size code: given on the manufacturer’s record; the code letters (such as SH) are defined by each manufacturer, so use that manufacturer’s specification sheet.
The suture strand has its own size and material, covered in what is a suture and absorbable versus non-absorbable sutures.
Limits of these descriptions
Size and style codes are defined by each manufacturer, so check the product’s own specification rather than assuming a code means the same thing across brands. Both main sources are veterinary materials, so confirm intended uses in a product’s instructions for use. Which needle suits a given patient and site is a decision for the treating clinician.
FAQ
What are the main suture needle types?
By point and body: taper point, taper cut, conventional cutting, reverse cutting, trocar point and micropoint spatula, as compared in the table above.
What is the difference between a cutting and a taper needle?
A cutting needle has a triangular cross-section with cutting edges; a taper needle has a round body with a sharp point that penetrates without cutting (KRUUSE; University of Saskatchewan).
What does reverse cutting mean?
The apex cutting edge is on the outside (convex side) of the curve, rather than the inside as on a conventional cutting needle.
What does 3/8 circle mean on a suture needle?
It is the curvature, expressed as the fraction of a full circle the needle’s arc covers. The 3/8 and 1/2 circle curves are the most common, per the University of Saskatchewan course.
Are suture needles regulated by the FDA?
Suturing needles are named in 21 CFR 878.4800, which classifies the device as Class I and exempts it from premarket notification, subject to the limitations in 878.9.
Sources
All sources checked 2026-10-30.
- 21 CFR 878.4800, Manual surgical instrument for general use: https://www.law.cornell.edu/cfr/text/21/878.4800
- KRUUSE, Suture Needles Fact Sheet, 06/2016: https://kruuse.com/Files/Files/Pdf/KRUUSE%20Suture%20Needles_Fact%20Sheet.pdf
- University of Saskatchewan WCVM, VSAC Lab 4 Part 1, Needles: https://wcvm.usask.ca/vsac205/Lab4/needles.php
- 21 CFR 882.4650, Neurosurgical suture needle: https://www.law.cornell.edu/cfr/text/21/882.4650
