What is ISO 80369?

ISO 80369 is series of standards that were developed by the International Organization for Standardization to improve patient safety and reduce the risk of small-bore misconnections used in liquid and gas healthcare applications. Small-bore connectors convey liquids or gases in a patient-care setting, and are used in enteral, respiratory, urinary, blood pressure, neuraxial and intravenous systems.

Patients often have multiple lines connected to them to deliver medicine and nutrients. Numerous devices and systems use the universal luer lock connector, which is a type of small-bore connector. A small-bore connector is defined as having an ID of less than 8.5 mm, and a luer is defined by the ISO 594-1 and ISO 594-2 standards as “a conical fitting with a 6% taper for syringes, needles and certain other medical equipment.”

Through this connector, a healthcare worker or patient could mistakenly connect one device used for one application, such as enteral nutrition, to another device used for another application, such as intravenous therapy.

What are the ISO 80369 standards?

Q: Q2: Which ISO 80369 parts require testing, and what do they cover?

ISO 80369-1: General requirements and framework. ISO 80369-2: Breathing systems and gases. ISO 80369-3: Enteral/gastric applications (e.g., ENFit). ISO 80369-6: Neuraxial (e.g., spinal/epidural). ISO 80369-7: Intravenous/hypodermic (updated Luer standard, replacing ISO 594). ISO 80369-20: Common test methods (Annexes B–I and updates like K for air leakage during aspiration). Other parts (e.g., -4, -5) are delayed or limited. Testing focuses mainly on -2, -3, -6, -7 via -20 methods.

Q: Q3: What are the most common tests in ISO 80369-20, and what equipment is typically needed?

Key tests include: Leakage by pressure decay (Annex B): Positive pressure (300–330 kPa), pressure transducer, timer. Liquid leakage (falling drop, Annex C): Pressurized liquid, visual inspection setup. Subatmospheric air leakage (Annex D/K): Vacuum source, bubble observation in water. Stress cracking (Annex E): Environmental chamber (temperature/humidity). Resistance to axial separation (Annex F): Universal tensile testing machine with load cell. Resistance to unscrewing/overriding (Annex G/H): Torque tester or biaxial system. Disconnection by unscrewing (Annex I): Increasing torque measurement. Equipment often includes reference gauges/connectors, pressure/vacuum sources, torque/force fixtures, and data acquisition systems. KingPo and similar suppliers provide fixtures, gauges, and integrated test setups for these.

Q: Q4: Why is calibration of ISO 80369 testing equipment important?

Calibration ensures accurate, repeatable results for dimensions, pressure, force, and torque. It maintains compliance with standards, supports regulatory audits (e.g., FDA, EU MDR), and prevents false pass/fail outcomes that could affect patient safety or product certification.

Q: Q5: Can ISO 80369 test equipment be used for all types of medical connectors?

No — it is specifically for small-bore connectors in the ISO 80369 series (non-Luer and application-specific Luers). It does not apply to larger connectors, general tubing, or unrelated medical devices. For legacy Luer connectors, older ISO 594 tests may still be referenced, but ISO 80369-7 is the current standard for IV/intravascular.

Q: Q6: What are the key differences between ISO 80369-7 and the older ISO 594 Luer standard?

ISO 80369-7 tightens tolerances, adds performance tests (via -20), introduces non-interconnectability features, and requires stricter functional validation (leakage, separation resistance, etc.). It aims to reduce misconnections compared to the more universal ISO 594 design.

Q: Q7: How have recent updates (e.g., ISO 80369-20:2024) affected testing?

Updates include refined disconnection torque methods (increasing torque instead of fixed rate), new air leakage during aspiration (Annex K), wider humidity ranges for environmental conditioning, and clarifications on variable vs. attribute data. Previous test results may not need retesting for legacy devices, but new submissions must follow the latest version.

Q: Q8: Do I need special reference gauges for ISO 80369 testing?

Yes — each part (e.g., -2, -3, -6, -7) specifies reference connectors/gauges (e.g., Figure C.1–C.x male/female reference connectors with 6% taper for Luers). These are critical for dimensional inspection and functional mating tests.

ISO 80369-1 General Requirements and Overview

ISO 80369-2 Breathing Systems and Driving Gases (Airway)

ISO 80369-3 Enteral and Gastric (Stomach)

ISO 80369-4 Urinary Collection (Urethra) – Postponed

ISO 80369-5 Limb Cuff Inflation (Tourniquets and BP Cuffs)

ISO 80369-6 Neuraxial (Spine)

ISO 80369-7 Intravenous (Artery/Veins)*

ISO 80369-20 Common Test Methods

ISO 80369 Testing Equipment

ISO 80369-1 — Small-bore connectors for liquids and gases in healthcare applications — Part 1: General requirements

Specifies general requirements, principles, and test methods for assessing non-interconnectable characteristics of small-bore connectors across the entire series to minimize misconnection risks

ISO 80369-2

— Small-bore connectors for liquids and gases in healthcare applications — Part 2: Connectors for breathing systems and driving gases applications Defines specific design, dimensions, and requirements for connectors used in respiratory / breathing systems and driving gases (e.g., ventilator circuits, anesthesia breathing systems).

Gauge Number	gauge	inspected object
C.1	Socket reference connector（R1）	R1 cone connector
C.2	Socket reference connector	R1 cone connector
C.3	Cone reference connector	R1 socket connector
C.4	Cone reference connector	R1 socket connector
C.8	Socket reference connector	R2 cone connector
C.9	Socket reference connector	R2 cone connector
C.10	Cone reference connector	R2 socket connector
C.11	Cone reference connector	R2 socket connector

ISO 80369-3

— Small-bore connectors for liquids and gases in healthcare applications — Part 3: Connectors for enteral applications Specifies connectors for enteral feeding / nutrition applications (e.g., enteral feeding tubes, syringes, giving sets) to prevent connection to vascular or other systems.

Gauge Number	gauge	inspected object
C.1	Female reference	male ENTERAL
C.2	Female reference CONNECTOR	male ENTERAL CONNECTOR
C.3	Male reference CONNECTOR	female ENTERAL CONNECTOR
C.4	Male reference CONNECTOR	female ENTERAL CONNECTOR

ISO 80369-4

— Small-bore connectors for liquids and gases in healthcare applications — Part 4: Connectors for urethral and urinary applications Covers connectors intended for urinary / urethral applications (e.g., urinary catheters, drainage systems).

ISO 80369-5

— Small-bore connectors for liquids and gases in healthcare applications — Part 5: Connectors for limb cuff inflation applications Defines connectors for limb cuff inflation (e.g., tourniquets, blood pressure cuffs, pneumatic tourniquets).

ISO 80369-6

— Small-bore connectors for liquids and gases in healthcare applications — Part 6: Connectors for neuraxial applications Specifies connectors for neuraxial applications (e.g., spinal/epidural anesthesia, intrathecal delivery) to prevent connection to vascular or enteral routes.

Gauge Number	gauge	inspected object
C.1	Female reference LOCK CONNECTOR	male neuraxial CONNECTOR
C.2	Male reference SLIP CONNECTOR	female neuraxial CONNECTOR
C.3	Female reference CONNECTOR	male neuraxial CONNECTOR
C.4	Male reference LOCK CONNECTOR	female neuraxial CONNECTOR
C.5	Male reference CONNECTOR	female neuraxial LOCK CONNECTOR

ISO 80369-7

— Small-bore connectors for liquids and gases in healthcare applications — Part 7: Connectors with 6% (Luer) taper for intravascular or hypodermic applications Updates and replaces the older ISO 594 Luer standards; defines the modern requirements for Luer connectors restricted to intravascular (IV) and hypodermic (injection) applications only, with tighter tolerances and non-interconnectability features with respect to other ISO 80369 parts.

Gauge Number	gauge	inspected object
C.1	Female reference Luer Lock Connector	male Luer Connector
C.2	Male reference Luer Slip Connector	female Luer Connector
C.3	Female reference Luer Slip Connector	male Luer Connector
C.4	Male reference Luer Lock Connector	female Luer Connector
C.5	Female reference Luer Slip Connector	male Luer Connector
C.6	Male reference Luer Lock Connector	female Luer Connector

ISO 80369-20

— Small-bore connectors for liquids and gases in healthcare applications — Part 20: Common test methods Provides standardized common test methods (performance, leakage, resistance, etc.) referenced by Parts 2–7 (and future parts) to evaluate functional performance of the connectors.

Annex	Test Method Name	Primary Purpose	Key Required Equipment / Apparatus
B	Leakage by Pressure Decay Test	Detect air leakage under positive pressure (decay rate)	– Reference connector (from relevant ISO 80369 part) – Precision pressure source & regulator (e.g., 300–330 kPa) – High-resolution pressure transducer / monitor – Timer & data acquisition system – Sealed test circuit & fixturing
C	Falling Drop Positive-Pressure Liquid Leakage Test	Visual detection of liquid leakage under pressure	– Reference connector – Liquid (e.g., water) pressurization system – Visual observation setup (drop collection/inspection) – Orientation fixturing (vertical/horizontal)
D	Subatmospheric-Pressure Air Leakage Test	Detect air ingress under vacuum (bubble test)	– Vacuum source & precise gauge – Reference connector – Immersion tank (water for bubble observation) – Fixturing for submersion
E	Stress Cracking Test	Assess material resistance to environmental stress cracking	– Environmental conditioning chamber (temp/humidity control) – Stress application fixture (often combined with leak tests B/C) – Reference connector
F	Resistance to Separation from Axial Load	Evaluate resistance to axial pull-apart forces	– Universal testing machine (tensile) with calibrated load cell – Axial load fixture – Rigid mounting for reference connector – Force/displacement recording system
G	Resistance to Separation from Unscrewing	Test resistance to unscrewing torque	– Torque testing system (manual/motorized) – Torque transducer/sensor – Fixturing for apply unscrewing torque – Reference connector
H	Resistance to Overriding	Assess resistance to overriding (over-torquing)	– Biaxial test system (axial force + torque) – Overriding/over-torque fixture – Reference connector – Combined force/torque recording
I	Disconnection by Unscrewing	Evaluate ease / resistance to intentional disconnection by torque	– Torque application device – Fixturing for repeated connect/disconnect cycles – Reference connector – Torque monitoring

General FAQs about ISO 80369 Testing

Q1: What is the main purpose of ISO 80369 testing equipment?

It evaluates small-bore connectors (<8.5 mm inner diameter) for dimensional accuracy, leakage resistance, mechanical strength, and non-interconnectability to ensure patient safety and compliance with ISO 80369 parts (especially -20 for test methods). Equipment checks size, shape, leak performance, axial/torque resistance, and stress cracking to prevent misconnections in medical applications like IV, enteral, respiratory, and neuraxial systems.

Q2: Which ISO 80369 parts require testing, and what do they cover?

ISO 80369-1: General requirements and framework.
ISO 80369-2: Breathing systems and gases.
ISO 80369-3: Enteral/gastric applications (e.g., ENFit).
ISO 80369-6: Neuraxial (e.g., spinal/epidural).
ISO 80369-7: Intravenous/hypodermic (updated Luer standard, replacing ISO 594).
ISO 80369-20: Common test methods (Annexes B–I and updates like K for air leakage during aspiration). Other parts (e.g., -4, -5) are delayed or limited. Testing focuses mainly on -2, -3, -6, -7 via -20 methods.

Q3: What are the most common tests in ISO 80369-20, and what equipment is typically needed?

Key tests include:

Leakage by pressure decay (Annex B): Positive pressure (300–330 kPa), pressure transducer, timer.
Liquid leakage (falling drop, Annex C): Pressurized liquid, visual inspection setup.
Subatmospheric air leakage (Annex D/K): Vacuum source, bubble observation in water.
Stress cracking (Annex E): Environmental chamber (temperature/humidity).
Resistance to axial separation (Annex F): Universal tensile testing machine with load cell.
Resistance to unscrewing/overriding (Annex G/H): Torque tester or biaxial system.
Disconnection by unscrewing (Annex I): Increasing torque measurement. Equipment often includes reference gauges/connectors, pressure/vacuum sources, torque/force fixtures, and data acquisition systems. KingPo and similar suppliers provide fixtures, gauges, and integrated test setups for these.

Q4: Why is calibration of ISO 80369 testing equipment important?