Overview
EN ISO 7376:2020/A1:2025 is a CEN-endorsed amendment to ISO 7376:2020 that clarifies optical output and illumination requirements for laryngoscopes used in tracheal intubation. Approved by CEN (15 December 2024) and published in 2025, this amendment provides measurable criteria for light output from handles and for the illuminated field produced by light-guide blades, improving interoperability and testability of laryngoscope systems.
Key topics and requirements
- Handle optical output: Handles designed for hook-on, light-guide illuminated blades shall deliver > 3 lumen optical output.
- This requirement applies to handles intended to be interchangeable with multiple blades.
- Conformance is verified using the test method in Annex B.
- System illumination supersedes handle-only rule: If a manufacturer supplies a complete laryngoscope system (handle + light-guide blade), the system illumination criteria take precedence.
- Illumination geometry and intensity (clauses 7.2.4 a–d):
- Horizontal (left–right) illumination span: > 50 mm and < 100 mm
- Vertical (upper–lower) illumination span: > 30 mm and < 80 mm
- Distance from blade tip to lower illumination edge: < 3 mm
- Illuminance: > 500 lux sustained for > 10 minutes
- Design guidance (Annex A): A handle output of 3 lumen is specified as a minimum to guide manufacturers, but the amendment notes that blade transmission losses vary; 500 lux cannot be guaranteed for all handle/blade combinations and the standard does not specify minimum blade transmission efficiency.
- Minor editorial updates: e.g., Figure B.1 table header labeled “Requirement” and B.3 f) updated to > 3 lumen.
Applications
- Product design and engineering: specify minimum light output and illumination geometry for laryngoscope handles and blades.
- Testing and conformity assessment: use Annex B test method to verify handle and system performance.
- Procurement and clinical specification: include measurable illumination metrics (> 500 lux, span dimensions, lumen) in tender documents.
- Quality assurance and maintenance: ensure devices meet sustained illuminance and spatial coverage for safe tracheal intubation.
Who should use this standard
- Medical device manufacturers (handles, light-guide blades, complete laryngoscopes)
- Biomedical engineers and clinical engineers
- Test laboratories and conformity assessors
- Hospital procurement teams and clinical departments (anesthesia, emergency medicine)
- Regulatory and standards bodies implementing EN/ISO requirements
Related standards
- ISO 7376:2020 (base standard for laryngoscopes) - this document is Amendment 1: 2025 and is endorsed as EN ISO 7376:2020/A1:2025 by CEN.
Keywords: EN ISO 7376:2020/A1:2025, laryngoscopes, tracheal intubation, optical output, illumination, 3 lumen, 500 lux, light-guide blade, Annex B test.
