ISO 5361:2023/Amd 1:2026
(Amendment)Anaesthetic and respiratory equipment — Tracheal tubes and connectors — Amendment 1: Reinstatement of third edition S1 dimensions
- Status
- Published
- Publication Date
- 01-Jul-2026
- Technical Committee
- ISO/TC 121/SC 2 - Airways and related equipment
- Drafting Committee
- ISO/TC 121/SC 2 - Airways and related equipment
- Current Stage
- 6060 - International Standard published
- Start Date
- 02-Jul-2026
- Due Date
- 03-Jun-2028
- Completion Date
- 02-Jul-2026
Buy Documents
ISO 5361:2023/Amd 1:2026 - Anaesthetic and respiratory equipment — Tracheal tubes and connectors — Amendment 1: Reinstatement of third edition S1 dimensions
ISO 5361:2023/Amd 1:2026 - Matériel d'anesthésie et de réanimation respiratoire — Sondes trachéales et raccords — Amendement 1: Rétablissement des dimensions S1 de la troisième édition
ISO 5361:2023/Amd.1:2026 is an ISO amendment to ISO 5361:2023 for anaesthetic and respiratory equipment - tracheal tubes and connectors. It reinstates the third edition S1 dimensions by replacing Table 1 in clause 6.3.1.6, so manufacturers, inspectors and buyers can work from the updated basic tube dimensions.
What does ISO 5361:2023/Amd.1:2026 specify?
ISO 5361:2023/Amd.1:2026 specifies a single technical update to the tracheal tube dimensional requirements in ISO 5361:2023. The amendment centers on clause 6.3.1.6 and replaces Table 1, which sets the basic dimensions of tracheal tubes in millimetres.
The document is organized as an amendment rather than a full revision. Its technical content is the replacement table, plus a note that points readers to Annex A.7 for the rationale and to Annex A and Annex B for background linked to paediatric intubation.
What are the key requirements of ISO 5361:2023/Amd.1:2026?
ISO 5361:2023/Amd.1:2026 changes how the basic dimensions of tracheal tubes are presented and applied. In practice, this is the table manufacturers and verifiers use to check whether a tube matches the intended size and patient group.
- Clause 6.3.1.6 now uses a replacement Table 1. Anyone checking conformity should use the amended table rather than the earlier one.
- Table 1 gives the basic dimensions of tracheal tubes in millimetres. That matters for design control, incoming inspection and product release.
- The table separates tracheal tubes for a general patient population from tubes designed specifically for neonatal and paediatric patients. This means the permitted geometry is not the same for every use case.
- The listed dimensions include A, C, C1 and S1. These dimensions control tube length and key distances along the tube, so they affect fit, placement and how the product is described to users.
- The table covers designated sizes from 2.0 to 11.0. That gives manufacturers and buyers a clear size range to match against a product line or purchase specification.
- A note under the table says clinical literature suggests that a shorter Dimension C can decrease the likelihood of endobronchial intubations for paediatric patients. For users, that is a design and selection cue for paediatric products.
- The note also points to Annex A and Annex B, and says Annex A.7 contains the rationale for Table 1. That helps explain why the revised dimensions were kept in the amended form.
What changed in ISO 5361:2023/Amd.1:2026 from the previous edition?
ISO 5361:2023/Amd.1:2026 reinstates the third edition S1 dimensions. The stated change is the replacement of Table 1 in clause 6.3.1.6 with the amended set of basic tracheal tube dimensions.
Who uses ISO 5361:2023/Amd.1:2026?
ISO 5361:2023/Amd.1:2026 is used by manufacturers of tracheal tubes and connectors, by product designers, and by quality and inspection teams that verify dimensions against the standard. It is also relevant to buyers and clinicians who need to specify or select tubes for neonatal, paediatric or general patient use.
What does the ISO 5361:2023/Amd.1:2026 document contain?
The document contains the ISO foreword, publication and copyright information, and the amendment text itself. The technical core is a replacement of Table 1 in clause 6.3.1.6.
It also includes a note beneath the table and a reference to Annex A.7 for the rationale behind the table. The supporting note links the revised dimensions to paediatric airway considerations, especially the effect of Dimension C on endobronchial intubation risk.
Relations
- Effective Date
- 12-Feb-2026
- Effective Date
- 08-Mar-2025
Buy Documents
ISO 5361:2023/Amd 1:2026 - Anaesthetic and respiratory equipment — Tracheal tubes and connectors — Amendment 1: Reinstatement of third edition S1 dimensions
ISO 5361:2023/Amd 1:2026 - Matériel d'anesthésie et de réanimation respiratoire — Sondes trachéales et raccords — Amendement 1: Rétablissement des dimensions S1 de la troisième édition
Get Certified
Connect with accredited certification bodies for this standard

BSI Group
BSI (British Standards Institution) is the business standards company that helps organizations make excellence a habit.

TÜV Rheinland
TÜV Rheinland is a leading international provider of technical services.

TÜV SÜD
TÜV SÜD is a trusted partner of choice for safety, security and sustainability solutions.
Sponsored listings
Frequently Asked Questions
ISO 5361:2023/Amd 1:2026 is a standard published by the International Organization for Standardization (ISO). Its full title is "Anaesthetic and respiratory equipment — Tracheal tubes and connectors — Amendment 1: Reinstatement of third edition S1 dimensions". This standard covers: Anaesthetic and respiratory equipment — Tracheal tubes and connectors — Amendment 1: Reinstatement of third edition S1 dimensions
Anaesthetic and respiratory equipment — Tracheal tubes and connectors — Amendment 1: Reinstatement of third edition S1 dimensions
ISO 5361:2023/Amd 1:2026 is classified under the following ICS (International Classification for Standards) categories: 11.040.10 - Anaesthetic, respiratory and reanimation equipment. The ICS classification helps identify the subject area and facilitates finding related standards.
ISO 5361:2023/Amd 1:2026 has the following relationships with other standards: It is inter standard links to EN ISO 5361:2023/A1:2026, ISO 5361:2023. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
ISO 5361:2023/Amd 1:2026 is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.
Standards Content (Sample)
International
Standard
ISO 5361
Fourth edition
Anaesthetic and respiratory
2023-01
equipment — Tracheal tubes and
connectors
AMENDMENT 1
2026-07
AMENDMENT 1: Reinstatement of
third edition S1 dimensions
Matériel d'anesthésie et de réanimation respiratoire — Sondes
trachéales et raccords
AMENDEMENT 1: Rétablissement des dimensions S1 de la
troisième édition
Reference number
ISO 5361:2023/Amd.1:2026(en) © ISO 2026
ISO 5361:2023/Amd.1:2026(en)
© ISO 2026
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii
ISO 5361:2023/Amd.1:2026(en)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out through
ISO technical committees. Each member body interested in a subject for which a technical committee
has been established has the right to be represented on that committee. International organizations,
governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely
with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are described
in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the different types
of ISO document should be noted. This document was drafted in accordance with the editorial rules of the
ISO/IEC Directives, Part 2 (see www.iso.org/directives).
ISO draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed patent
rights in respect thereof. As of the date of publication of this document, ISO had not received notice of (a)
patent(s) which may be required to implement this document. However, implementers are cautioned that
this may not represent the latest information, which may be obtained from the patent database available at
www.iso.org/patents. ISO shall not be held responsible for identifying any or all such pate
...
Norme
internationale
ISO 5361
Quatrième édition
Matériel d'anesthésie et de
2023-01
réanimation respiratoire — Sondes
trachéales et raccords
AMENDEMENT 1
2026-07
AMENDEMENT 1: Rétablissement des
dimensions S1 de la troisième édition
Anaesthetic and respiratory equipment — Tracheal tubes and
connectors
AMENDMENT 1: Reinstatement of third edition S1 dimensions
Numéro de référence
ISO 5361:2023/Amd.1:2026(fr) © ISO 2026
ISO 5361:2023/Amd.1:2026(fr)
DOCUMENT PROTÉGÉ PAR COPYRIGHT
© ISO 2026
Tous droits réservés. Sauf prescription différente ou nécessité dans le contexte de sa mise en œuvre, aucune partie de cette
publication ne peut être reproduite ni utilisée sous quelque forme que ce soit et par aucun procédé, électronique ou mécanique,
y compris la photocopie, ou la diffusion sur l’internet ou sur un intranet, sans autorisation écrite préalable. Une autorisation peut
être demandée à l’ISO à l’adresse ci-après ou au comité membre de l’ISO dans le pays du demandeur.
ISO copyright office
Case postale 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Genève
Tél.: +41 22 749 01 11
E-mail: copyright@iso.org
Web: www.iso.org
Publié en Suisse
ii
ISO 5361:2023/Amd.1:2026(fr)
Avant-propos
L'ISO (Organisation internationale de normalisation) est une fédération mondiale d’organismes nationaux
de normalisation (comités membres de l’ISO). L'élaboration des Normes internationales est en général
confiée aux comités techniques de l'ISO. Chaque comité membre intéressé par une étude a le droit de faire
partie du comité technique créé à cet effet. Les organisations internationales, gouvernementales et non
gouvernementales, en liaison avec l'ISO participent également aux travaux. L'ISO collabore étroitement avec
la Commission électrotechnique internationale (IEC) en ce qui concerne la normalisation électrotechnique.
Les procédures utilisées pour élaborer le présent document et celles destinées à sa mise à jour sont
décrites dans les Directives ISO/IEC, Partie 1. Il convient, en particulier, de prendre note des différents
critères d'approbation requis pour les différents types de documents ISO. Le présent document a
été rédigé conformément aux règles de rédaction données dans les Directives ISO/IEC, Partie 2 (voir
www.iso.org/directives).
L'ISO attire l'attention sur le fait que la mise en application du présent document peut entraîner l'utilisation
d'un ou de plusieurs brevets. L'ISO ne prend pas position quant à la preuve, à la validité et à l'applicabilité de
tout droit de brevet revendiqué à cet égard. À la date de publication du présent document, l'ISO n’avait pas
reçu notification qu'un ou plusieurs brevets pouvaient être nécessaires à sa mise en application. Toutefois,
il y a lieu d'avertir les responsables de la mise en application du présent document que des informations
plus récentes sont susceptibles de figurer dans la base de données de brevets, disponible à l'adresse
www.iso.org/brevets. L'ISO ne saurait être tenue pour responsable de ne pas avoir identifié tout ou partie de
tels droits de brevet.
Les appellations commerciales éventuellement mentionnées dans le présent document sont données pour
information, par souci de commodité, à l'intention des utilisateurs et ne sauraient constituer un engagement.
Pour une explication de la nature volontaire des normes, la signification des termes et expressions
spécifiques de l'ISO liés à l'évaluation de la conformité, ou pour toute information au sujet de l'adhésion de
l'ISO aux principes de l'Organisation mondiale du commerce (OMC) concernant les obstacles techniques au
commerce (OTC), voir le lien suivant: www.iso.org/avant-propos.
Le présent document a été élaboré par le comité technique ISO/TC 12
...







