ISO 80369-20 Test methods Small-bore connectors for liquids and gases in healthcare

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ISO 80369-20 Small-bore connectors for liquids and gases in healthcare applications – Part 20: Common test methods.

ISO 80369 standard outlines 9 specific test methods, each placed in an informative annex. These are broadly categorized into Leakage Tests, Mechanical Stress Tests, and Functional Tests. All tests use reference connectors defined in application‑specific parts (e.g., ISO 80369‑7) and uniform assembly rules.

Universal Preconditioning & Environment

Preconditioning: (20 ± 5) °C, (50 ± 10) % RH for ≥24h (required for hygroscopic materials; skip for non‑hygroscopic)

Test environment: 15–30 °C, 10–70 % RH (unless overridden by application parts)

Assembly:

Slip (non‑locking): Axial force 26.5–27.5N + torque ≤0.10Nm, rotation ≤90°, hold 5–6s

Locking: Torque 0.08–0.12Nm + axial force 26.5–27.5N, hold 5–6s

Details test stipulated in ISO 80369-20 introduction:

1, Leakage by Pressure Decay
Test Method	Pressurize the connected assembly with dry air; judge leakage by pressure change (not leakage rate)
Stipulations	Defined start pressure, test volume, test period; max allowable pressure change set by application part. Absolute pressure change ≤ threshold defined by application part.
Samples	Representative production connectors (rigid/semi‑rigid); 60 samples per group for validation
Equipment	Pressure tester with pressure source, pressure gauge (±0.3% FS), timer, stop valve, test volume fixture, reference connector
Procedure	Seal sample; assemble to reference connector; Pressurize to specified value; close valve; Record start/end pressure and duration; Calculate pressure chang.
2, Falling Drop Positive‑Pressure Liquid Leakage
Test Method	Water (often dyed with methylene blue) is introduced into the connection and pressurized.
Stipulations	300–330 kPa (per ISO 80369‑7), hold 30–35 s; horizontal orientation. No water droplets shall form or fall from the connection interface during the test.
Samples	Connector under test + appropriate reference connector (both dry before assembly).
Equipment	Water reservoir, pressurization system, pressure gauge (±0.3%), timing device.
Procedure	Assemble; fill with water, expel air Pressurize; hold duration Inspect for dripping
3, Subatmospheric‑Pressure Air Leakage Test
Test Method	Similar to Leakage by Pressure Decay, but a vacuum (negative pressure) is applied inside the connector instead of positive pressure.
Stipulations	80.0–88.0 kPa vacuum, hold 15–20 s; max pressure change defined by application part
Equipment	Vacuum pump, pressure gauge, timer, test volume fixture
4, Air Leakage During Aspiration
Test Method	Apply vacuum while filled with water; detect continuous air bubbles
Stipulations	Specified subatmospheric pressure; wait 20 s for initial bubbles to stop
Equipment	Vacuum source, transparent water vessel, pressure gauge, timer
5, Stress Cracking test
Test Method	Evaluates if the connector material cracks when exposed to chemicals (e.g., disinfectants) under mechanical stress.
Stipulations	Assembly duration ≥48 h (extendable by application part)
Equipment	Fixture to maintain connection, leakage test setup
6, Resistance to Separation from Axial Load
Test Method	A direct pulling force (tension) is applied to the mated connectors.
Stipulations	The connectors must withstand a specified axial force (e.g., 23N to 35N depending on the application) for 10-15 seconds without separating.
Equipment	Tensile tester, force gauge, timer
Procedure	Assemble; apply axial force at ~10 N/s Hold; check sealing interface
7, Resistance to Separation from Unscrewing
Test Method	Applies to locking connectors (e.g., Luer Lock). A rotational unscrewing torque is applied.
Stipulations	Must withstand a specified torque (e.g., 0.018–0.020 N·m) for 10-15 seconds without disengaging.
Equipment	Torsion tester, timer
Procedure	Assemble locking connector; Apply unscrewing torque; hold; Inspect the connection condition.
8, Resistance to Overriding
Test Method	Tests the durability of the locking threads/lugs by applying a high overriding torque.
Stipulations	The locking mechanism must not strip, crack, or override when subjected to a specified maximum torque (e.g., 0.15–0.17 N·m).
Equipment	Torsion tester, timer
Procedure	Assemble; apply torque; Hold; inspect thread/lug engagement condition.
9, Disconnection by Unscrewing Test
Test Method	Ensures that connectors intended for daily disconnection (like syringe tips) can be easily and reliably unscrewed by the user without excessive force.
Stipulations	Peak torque ≤ limit set by application part
Equipment	Torsion tester with high sampling rate
Procedure	Assemble; rest 10–15 min; Increase unscrewing torque until separation; Record peak torque.

Industry Field & Application

This standard is exclusively applied in the Healthcare and Medical Device Manufacturing industry. It governs the testing of small-bore connectors used in:

Intravenous (IV) therapy and hypodermic injections.

Respiratory ventilation and anesthesia.

Enteral feeding and urological drainage.

Neuraxial procedures (spinal/epidural).

Its ultimate goal is to provide a harmonized testing framework that guarantees the physical compatibility and safety of these life-critical interfaces.

Related Standards

ISO 80369 (1~7): General requirements for non‑interconnection & usability; Application‑specific connector dimensions (respiratory, enteral, neuraxial, intravascular, etc.

ISO 18250 series: Connectors for medical reservoir delivery systems

ISO 14971:2019: Medical device risk management

IEC 62366‑1: Medical device usability engineering

IMDRF GRRP WG/N47: Essential safety/performance principles

EU 2017/745 MDR: European medical device regulation

A single column tensile tester is a sophisticated material testing instrument designed for measuring mechanical properties of various materials under tension, compression, bending, shear, and other loading conditions. As the name suggests, it features a single vertical column supporting a moving crosshead that applies force to test specimens.

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