IEC 80601-2-71:2015

Overview

IEC 80601-2-71:2015 - "Medical electrical equipment - Part 2-71: Particular requirements for the basic safety and essential performance of functional near‑infrared spectroscopy (NIRS) equipment" - defines safety and performance requirements for functional NIRS equipment (often abbreviated as fNIRS). The standard applies to fNIRS devices used alone or as part of a medical electrical (ME) system to produce functional NIRS outputs for adjunctive diagnostic purposes. It sets out test methods, performance verification and essential documentation needed to demonstrate basic safety and essential performance of NIRS medical electrical equipment.

Key Topics and Requirements

• Scope & exclusions: Clarifies what is covered and what is not - for example, it excludes NIRS tissue oximeters not intended for functional output, pulse oximeters (see ISO 80601-2-61), frequency‑domain/time‑domain systems that require different tests, and devices measuring chromophores beyond oxy-/deoxy‑haemoglobin.
• Safety & performance structure: Builds on IEC 60601‑1 general requirements for ME equipment and provides particular requirements specific to functional NIRS devices.
• Electrical and mechanical protection: Requirements for protection against electrical hazards, mechanical hazards, excessive temperatures and unwanted radiation.
• Optical performance and measurements: Defines optical tests and metrics referenced in figures and tables - e.g., spectral power distribution (FWHM), average optical power, peak wavelength, signal stability, response time, rise/fall time, signal‑to‑noise ratio, and signal cross‑talk.
• Performance testing tools: Normative and informative annexes include a FUNCTIONAL NIRS PHANTOM (Annex BB) and guidance for using phantoms/attenuators to evaluate ME equipment performance.
• Identification, marking, documentation: Labelling requirements, instructions for use, and accompanying documents to support safe clinical use.
• Programmable systems & EMC: Requirements for programmable electrical medical systems (PEMS) and electromagnetic compatibility testing for ME equipment and ME systems.

Practical Applications - Who Uses This Standard

• Manufacturers of functional NIRS/fNIRS devices for design, risk management, verification and regulatory submissions.
• Regulatory and compliance teams preparing technical files and conformity assessments for markets that reference IEC standards.
• Test laboratories and certification bodies executing the standard’s test methods (including phantom‑based performance tests).
• Biomedical and clinical engineers, procurement specialists and hospital technology managers specifying safe, compliant fNIRS systems for research and adjunctive diagnostics.
• R&D teams developing new NIRS hardware and systems that must meet IEC 80601‑2‑71 safety and performance expectations.

Related Standards

• IEC 60601‑1 - General requirements for basic safety and essential performance of medical electrical equipment (collateral).
• ISO/IEC references and collateral standards cited in the standard (see Clause 2); ISO 80601‑2‑61 applies to pulse oximeters (not covered here).

This standard is essential for ensuring that functional NIRS equipment meets internationally accepted safety, performance and testing practices for clinical and research environments.