Overview
EN ISO 21533:2018 (ISO 21533:2018) specifies requirements and test methods for reprocessable cartridge syringes intended for intraligamentary injections in dentistry. The standard applies to cartridge syringes with ISO metric thread sizes and covers design, dimensional requirements, performance tests and reprocessing resistance. It updates and supersedes the 2003 edition and adds a dosage-wheel design and clarification on reprocessing.
Key Topics and Requirements
- Scope and design types
- Applicable designs: pistol-grip, pen-grip, and dosage-wheel syringe configurations.
- Only for intraligamentary injections (via the periodontal ligament).
- Dimensional and interface requirements
- Barrel dimensions, threaded needle‑mounting hub, and plunger rod dimensions and travel conform with ISO 9997.
- Barrel must accept cartridges conforming to ISO 11499; if a viewing port is provided, the barrel must also accommodate a protective sleeve.
- Performance and dosing
- Volume delivered per lever depression or dosage‑wheel rotation must be within ±10% of the manufacturer’s claim (test methods outlined).
- Protective sleeve
- If supplied, the protective sleeve must be specified as single‑use or reprocessable and must retain integrity during use.
- Resistance to reprocessing
- Syringes must show no signs of corrosion after 100 reprocessing cycles when tested per the standard’s methods.
- Testing and documentation
- Test methods include visual inspection, volume measurement, protective sleeve dislodgement, and reprocessing resistance.
- Requirements for instructions for use and product marking (syringe and unit pack) are included.
- Additional note
- Annex A highlights the existence of devices with imperial thread sizes (informative).
Applications and Users
- Medical device manufacturers designing or producing reprocessable dental cartridge syringes for intraligamentary injections.
- Regulatory and conformity assessors verifying compliance with European/CEN requirements.
- Sterilization and reprocessing service providers evaluating device durability through repeated cycles.
- Dental procurement and clinics specifying compliant syringes for practice and patient safety.
- Design engineers implementing dosage‑wheel mechanisms or conversion between metric and imperial interfaces.
Related Standards
- ISO 9997 - Dental cartridge syringes (dimensions/interface)
- ISO 11499 - Single‑use cartridges for local anaesthetics
- ISO 1942 - Dentistry vocabulary
- ISO 7885 - Sterile injection needles for single use
EN ISO 21533:2018 provides a focused framework for manufacturers and users to ensure safe, durable and accurately dosing reprocessable syringes used specifically for intraligamentary injections.
