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A bistoury is a long, narrow surgical knife used for minor incisions, with a straight or curved blade and, on some patterns, a sharp or blunt probe point. The word is mostly met in older instrument catalogues, museum records and dictionaries; current supply and regulatory language more often says scalpel, scalpel blade or surgical knife. This page is general product information, not medical advice and not a description of any procedure.
Short answer
Bistoury names a type of hand-held surgical knife. The American Heritage Dictionary defines it as “a long, narrow surgical knife for minor incisions” (checked 2026-10-30). The Royal College of Physicians and Surgeons of Glasgow adds that it has either a straight or curved blade, and that bistoury knives can have a sharp or blunt probe point (heritage collection record, checked 2026-10-30).
What does bistoury mean?
The American Heritage Dictionary gives the origin as French bistouri, “perhaps from Italian dialectal bistori, from bistorino, of Pistoia, from Latin Pistorium, Pistoia”. The “perhaps” is the dictionary’s own: the derivation is not settled. In practice the term describes the shape of the knife (long and narrow) rather than a brand, material or size.
How the term is used in instrument records
Two features appear in the museum description and are worth reading for when you meet the word in a catalogue, an inventory line or a historical record:
- Blade line: straight or curved.
- Tip: a sharp point or a blunt probe point.
The Glasgow collection holds, for example, a curved bistoury from the 1860s made by S. Maw and Son Ltd in metal and ebony, 17.5 cm long (item 2003/12.18). The record does not state its tip, so a record that says only “bistoury” does not tell you the blade line or tip.
Types: reading the descriptors
| Descriptor | What the source says | Source |
|---|---|---|
| Straight blade | A bistoury may have a straight blade | RCPSG heritage collection, 2026-10-30 |
| Curved blade | A bistoury may have a curved blade | RCPSG heritage collection, 2026-10-30 |
| Sharp probe point | Bistoury knives can have a sharp probe point | RCPSG heritage collection, 2026-10-30 |
| Blunt probe point | Bistoury knives can have a blunt probe point | RCPSG heritage collection, 2026-10-30 |
Blade line and tip are independent: a record can combine either blade line with either tip type. Sizes, materials and any numbering are specific to each maker and are not set by the word bistoury.
Bistoury and scalpel: how the terms overlap
Both words describe small hand-held cutting instruments. The dictionary definition above is narrower in shape (long, narrow), while current U.S. regulatory text uses the modern names. In 21 CFR 878.4800, the manual surgical instruments for general use include “knife”, “scalpel blade”, “scalpel handle” and “one-piece scalpel”; the word bistoury does not appear in that list (Cornell Legal Information Institute copy of the CFR, checked 2026-10-30). If a supply listing or record uses either word, read the described blade and tip rather than assuming the two are interchangeable. For the modern instrument see what a scalpel is, and for one specific blade shape see the crescent blade guide.
Where it matters for labs, clinics and supply decisions
Under 21 CFR 878.4800(b), manual surgical instruments for general use are Class I (general controls) and exempt from premarket notification, subject to the limitations in 21 CFR 878.9. The same section says an instrument with specialized uses in a specific medical specialty is classified in separate regulations in parts 868 through 892. That regulation does not name the bistoury, so this page does not state how any particular bistoury product is classified. Staff who maintain instrument inventories can use a simple checklist drawn from the sources above:
- Does the record say straight or curved?
- Does it state a sharp point, a blunt probe point, or neither?
- Is it described as reusable or disposable? The regulation covers both, so the word alone does not say.
- Is the product described under a current name (scalpel blade, handle, knife) that matches the regulatory wording?
Related reading on this site: what a medical device is, surgical retractors and medical and laboratory forceps.
Common misunderstandings
- “Bistoury is a brand.” No. The dictionary and museum sources treat it as a type of knife.
- “Every bistoury is curved.” No. The Glasgow record states straight or curved.
- “It always has a sharp tip.” No. Probe points can be sharp or blunt.
- “The CFR classifies bistouries by name.” The general-use list in 21 CFR 878.4800 does not name the bistoury.
FAQ
What is a bistoury?
A long, narrow surgical knife for minor incisions (American Heritage Dictionary, checked 2026-10-30).
Is a bistoury the same as a scalpel?
Both are small hand-held surgical knives, but the sources used here define the bistoury by its long, narrow shape and straight or curved blade, while U.S. regulation lists scalpel blades and handles by name. Check the item description rather than assuming equivalence.
Is a bistoury regulated as a medical device?
21 CFR 878.4800 covers manual surgical instruments for general use, including knives and scalpel blades, as Class I (general controls), exempt from premarket notification subject to 21 CFR 878.9. The regulation does not name the bistoury, so this page does not state how a particular bistoury product is classified.
Where does the word come from?
French bistouri, perhaps from Italian dialect bistori and ultimately from Pistoia, per the American Heritage Dictionary.
Sources
- American Heritage Dictionary of the English Language, entry “bistoury”: https://www.ahdictionary.com/word/search.html?q=bistoury (checked 2026-10-30).
- Royal College of Physicians and Surgeons of Glasgow, heritage collection, “Curved Bistoury”: https://heritage.rcpsg.ac.uk/items/show/292 (checked 2026-10-30).
- 21 CFR 878.4800, Manual surgical instrument for general use, via Cornell Legal Information Institute: https://www.law.cornell.edu/cfr/text/21/878.4800 (checked 2026-10-30).
