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General product information, not medical advice. A laryngectomy tube is sized and prescribed by a clinician. This page decodes the size codes on one manufacturer’s tubes, the Atos Medical Provox LaryTube, so you can read a code such as 8/36 and match it to a model. For care and handling, see what a laryngectomy tube is and how it is used safely.
Short answer: a Provox LaryTube code has the form diameter/length. Diameter comes in four designations (8, 9, 10 and 12) and length in three sizes (27, 36 and 55 mm). That gives 12 standard sizes, plus 8 with-ring and 8 fenestrated sizes sold only in 36 and 55 mm, 28 catalogue sizes in all. Searches for “larytube sizes” and “lary tube sizes” lead to this same chart.
LaryTube size chart (diameter x length x model)
Reference numbers (REF) below are the ones in the manufacturer’s product information sheet for the Provox LaryTube (document PF011-01-TechInfo, edition 2.0). A dash means that combination is not listed.
| Code (diameter/length) | Standard REF | With Ring REF | Fenestrated REF |
|---|---|---|---|
| 8/27 | 7601 | – | – |
| 8/36 | 7602 | 7624 | 7637 |
| 8/55 | 7603 | 7625 | 7638 |
| 9/27 | 7605 | – | – |
| 9/36 | 7606 | 7626 | 7640 |
| 9/55 | 7607 | 7627 | 7641 |
| 10/27 | 7609 | – | – |
| 10/36 | 7610 | 7628 | 7643 |
| 10/55 | 7611 | 7629 | 7644 |
| 12/27 | 7613 | – | – |
| 12/36 | 7614 | 7630 | 7646 |
| 12/55 | 7615 | 7631 | 7647 |
The product information sheet also carries a second reference list whose numbers end in “FR” (for example 7609FR). Use the list that matches your market and your product’s labelling; the two lists are not interchangeable. Always check your product’s labelling for the exact code and REF before relying on this chart.
How to read a code like 8/36
The manufacturer names its tubes “Provox LaryTube D/L”: the first number is the diameter designation and the second is the length in millimetres. So 8/36 is diameter designation 8, length 36 mm. The instructions for use (manual 90734, 2022-03-14) give the lengths in mm but list the diameters only as the numbers 8, 9, 10 and 12, with no unit. Do not convert a designation into millimetres yourself; a figure for the inner diameter has to come from the manufacturer’s own labelling.
Who chooses the size
Choosing and fitting a size is a clinical task, so this page gives no measuring or fitting steps. The manufacturer’s instructions for use state that the clinician can use a Provox LaryTube Sizer Kit, which contains samples (“sizers”) of the commercially available tubes, to help choose which sizes to prescribe. The product information sheet describes the tube as prescription only.
What a wrong size can do
The instructions for use warn that, if a tube is not an appropriate size, a tube that is too wide, too narrow, too long or too short may cause tissue damage, bleeding or irritation, and may make voice production harder. A tube that is too narrow may cause the stoma to shrink.
Standard, ring and fenestrated availability
- Standard: all 12 sizes, including the only 27 mm lengths. Sold with or without a voice prosthesis in use, held with a TubeHolder or LaryClip.
- With Ring: 8 sizes, 36 and 55 mm only. The Ring is a silicone part that, per the instructions for use, is used with Provox Adhesive.
- Fenestrated: 8 sizes, 36 and 55 mm only, intended for voice prosthesis users, with a TubeHolder or LaryClip.
All three are silicone and supplied non-sterile for a single patient, according to the product information sheet.
Common mix-ups
Is a laryngectomy tube size the same as a tracheostomy tube size?
No. A tracheostomy tube is a different device with its own sizing system; see tracheostomy tube sizes and what a tracheostomy tube is. Do not use one device’s size to pick the other.
Is a LaryTube the same as a LaryButton?
No. The LaryButton is a separate Atos product with its own sizes. Check the product name on your labelling to see which one you have.
Is the diameter number in millimetres?
The manufacturer’s documents give the diameter as a designation (8, 9, 10, 12) without a unit, while lengths are in mm. Treat the two numbers in a code as different kinds of value.
Where do an HME or stoma cover fit in?
They are separate accessories. See laryngectomy HMEs and stoma covers.
FAQ
What sizes do Provox LaryTubes come in?
Four diameter designations (8, 9, 10, 12) and three lengths (27, 36, 55 mm), per the manufacturer’s instructions for use. Ring and fenestrated versions are listed only in 36 and 55 mm.
How many LaryTube sizes are there in total?
Twenty-eight in the product information sheet: 12 standard, 8 with Ring and 8 fenestrated.
Who decides which size to use?
A clinician. The manufacturer describes a Sizer Kit for the clinician’s use when choosing sizes to prescribe, and lists the tube as prescription only.
Sources
- Atos Medical, Provox LaryTube instructions for use, manual 90734, 2022-03-14: https://www.atosmedical.com/wp-content/uploads/sites/2/2023/12/90734_Provox-LaryTube-Manual_2022-03-14_web.pdf (checked 2026-11-01).
- Atos Medical, Product Information PF011-01-TechInfo, edition 2.0, June 2024: https://atosmedical.com/download/sites/2/2024/06/TechInfo-Provox-Lary-products-June2024.pdf (checked 2026-11-01).
