ISO 27186:2020

Overview

ISO 27186:2020 - Active implantable medical devices - Four-pole connector system for implantable cardiac rhythm management devices - Dimensional and test requirements - defines the dimensional and test requirements for a four-pole connector system used with implantable cardiac rhythm management (CRM) devices. The standard covers both the lead connector (the connector portion of an implantable lead) and the mating connector cavity in an implantable pulse generator, specifying essential dimensions, performance requirements and applicable test methods.

Key scope points:

• Applies to four-pole connectors for pacing, electrogram sensing and/or defibrillation functions.
• Establishes two connector types: high-voltage and low-voltage only (with dimensional lockout to prevent unsafe contact).
• Does not replace unipolar/bipolar standards (e.g., ISO 11318, ISO 5841-3).
• Not applicable to systems >1 000 V and/or >50 A or to devices with unique sensors/electrodes outside conventional pacing/sensing/defibrillation.
• Manufacturers retain responsibility for safety, biocompatibility and overall system reliability.

Key topics and technical requirements

ISO 27186:2020 addresses practical connector engineering and testing, including:

• Dimensional requirements for lead connectors and connector cavities to ensure interchangeability.
• Materials and contact materials guidance for biocompatibility and corrosion resistance.
• Electrical requirements: electrical isolation, dielectric strength, current-carrying tests (with annexed test methods).
• Mechanical performance: insertion force, retention force, withdrawal force, tensile loads, deformation under contact loads.
• Seal zone requirements to maintain hermetic separation and prevent fluid ingress.
• Contact resistance and stability tests and fatigue assessments to verify long-term electrical connection integrity.
• Normative and informative annexes provide test procedures and rationale (e.g., electrical isolation, dielectric strength, high-voltage current-carrying tests, contact material requirements, fatigue and seal-zone behavior).