ISO 14708-3:2017

Overview

ISO 14708-3:2017 - Implants for surgery: Active implantable medical devices - Part 3: Implantable neurostimulators defines particular safety, performance and type‑test requirements for devices that provide electrical stimulation of the central or peripheral nervous system (commonly called implantable neurostimulators or INS). The standard supplements and takes priority over ISO 14708-1, and is intended for type testing (sample device testing to assess behaviour), not routine production testing.

Key scope points:

• Applies to implantable neurostimulators and related parts/accessories (e.g., implantable pulse generators (IPG), leads, programmers, and software) that can affect safety or performance.
• Excludes purely non‑implantable external neurostimulators (covered by IEC 60601‑1 series).
• Addresses device design, markings, packaging, protection, and documentation to assure patient/user safety.

Key Topics and Technical Requirements

• Terminology and definitions specific to neurostimulators (INS, IPG, MR Conditional, projected service life, DUT).
• Type tests to evaluate device behavioural responses under defined conditions (explicitly not for routine manufacturing QA).
• Risk management: manufacturers must evaluate risks (referencing ISO 14971), including wireless coexistence and wireless quality of service for devices with wireless links; compliance is checked via the risk management file.
• Thermal safety: implantable parts not intended to supply heat must meet at least one criterion - e.g., outer surface ≤ 39 °C, or compliance with CEM43 thermal dose thresholds (Table 101) - or provide justification for higher temperatures.
• Protection features: requirements for protection against unintended biological effects, electrical hazards, heat, ionizing radiation, electromagnetic non‑ionizing radiation, electrostatic discharge, mechanical forces, pressure and temperature changes, and external defibrillator effects.
• Markings, packaging and documentation: requirements for device and packaging labels, sterile pack construction, and accompanying technical/user documentation.
• Informative/Normative annexes provide rationale, relationships to fundamental principles, and board/layout guidance.

Practical Applications - Who Uses This Standard

• Medical device manufacturers (design, R&D, and regulatory teams) for designing, validating and documenting implantable neurostimulators.
• Test laboratories performing type tests and safety evaluations.
• Regulatory and conformity assessors / notified bodies reviewing safety dossiers and risk management.
• Clinical engineers and procurement teams assessing device specifications and MR Conditional status.
• Design architects addressing EMC, wireless coexistence, thermal management (CEM43), and implantable packaging/marking.

Related Standards

• ISO 14708-1 (general requirements for active implantable medical devices)
• ISO 14971 (risk management for medical devices)
• ISO 14117 (EMC test protocols for implantable cardiac devices)
• IEC 60601-1 series (electrical safety for medical electrical equipment)
• ISO/TS 10974 (MRI safety assessment for active implantable devices)

Keywords: ISO 14708-3:2017, implantable neurostimulators, active implantable medical devices, IPG, neurostimulator testing, type tests, risk management, EMC, MR Conditional, CEM43 thermal dose, ISO 14708-1.