Overview
ISO 18777:2005 - Transportable liquid oxygen systems for medical use specifies safety and essential‑performance requirements for transportable liquid oxygen systems used as a supply source for oxygen therapy. These systems typically consist of a portable unit carried by (or with) the patient during use and the larger vessel used to refill that portable unit. The standard focuses on devices used in home care and healthcare facilities, often operated without professional supervision. Liquid oxygen vessels supplying fixed pipeline systems are explicitly excluded.
Key topics and requirements
ISO 18777:2005 is a Particular Standard based on IEC 60601‑1 and supplements/modifies the general medical electrical equipment requirements. Major technical topics covered include:
- Classification, identification and marking (labels, symbols, accompanying documents)
- Safety and essential performance requirements for transportable and refillable systems
- Power input and electrical safety (protective earthing, leakage currents, dielectric strength)
- Mechanical design and robustness (mechanical strength, stability, moving parts, expelled parts)
- Pressure vessels and cryogenic considerations (vacuum insulated vessels and operational safety)
- Fire prevention, overflow and leakage management (spillage, humidity, ingress protection)
- Electrostatic charges and oxygen compatibility (materials and cleaning to avoid ignition risk)
- Biocompatibility and user safety for parts contacting patients or oxygen flow paths
- Environmental and EMC requirements (electromagnetic compatibility, environmental tests)
- Human factors and labelling (use without professional supervision, instructions for safe use)
- Annexes providing rationale (Annex AA) and environmental aspects (Annex BB)
(The standard includes normative references such as EN 1251 series for cryogenic vessels, ISO 15001 for oxygen compatibility and IEC 60601‑1.)
Applications and who uses it
ISO 18777:2005 is used by:
- Manufacturers and designers of transportable liquid oxygen systems to meet safety and performance obligations
- Test laboratories and conformity assessment bodies for type testing and certification
- Regulatory and quality teams ensuring device compliance with medical device directives/requirements
- Procurement and clinical engineering selecting safe portable oxygen solutions for home care and institutions
- Healthcare providers and homecare suppliers to understand user-safety, labeling and operating constraints
Related standards
- IEC 60601‑1 (general safety for medical electrical equipment) - basis for this Particular Standard
- EN 1251‑1/2/3 (cryogenic transportable vacuum‑insulated vessels)
- ISO 15001 (oxygen compatibility)
- EN 980 / ISO 7000 (graphical symbols)
ISO 18777:2005 is essential for organizations developing or certifying portable liquid oxygen systems to ensure safe, reliable oxygen therapy in unsupervised environments.
