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ISO 15883-7:2017 Washer-disinfectors — Part 7: Requirements and tests for washer-disinfectors employing chemical disinfection for non-invasive, non-critical medical devices and healthcare equipment
A comprehensive guide to scope, technical requirements, and compliance for chemical disinfection processes in healthcare reprocessing
Scope and Purpose
ISO 15883-7:2017 is part of the multi-part ISO 15883 series dedicated to washer-disinfectors used in healthcare and medical device reprocessing. This standard specifically addresses washer-disinfectors that employ chemical disinfection for the reprocessing of non-invasive, non-critical medical devices and healthcare equipment. Non-critical devices are those that come into contact only with intact skin (e.g., stethoscopes, blood pressure cuffs, bedpans, commodes, washbasins). The standard provides requirements and test methods for both cleaning and chemical disinfection phases, ensuring that the washer-disinfector can achieve a validated level of cleanliness and microbial reduction without relying on thermal disinfection (i.e., high temperature). This is especially important for devices that are heat-sensitive and cannot withstand the thermal disinfection conditions specified in other parts of the standard.
ISO 15883-7:2017 complements ISO 15883-6:2011 (which covers thermal disinfection for the same categories of items) and references ISO 15883-1:2006 for general definitions, performance requirements, and safety aspects. The standard is designed for use by manufacturers of washer-disinfectors, testing laboratories, and healthcare facilities responsible for reprocessing non-critical items.
Key Technical Requirements
Cleaning Performance
As required by ISO 15883-1, the washer-disinfector must be capable of removing organic and inorganic residues from the load items. For Part 7, cleaning efficacy is demonstrated using test soils and methods defined in ISO 15883-5. The equipment must achieve a specified cleaning performance, typically verified by visual inspection and quantitative methods (e.g., protein residue measurement). The standard specifies that the cleaning phase must precede the chemical disinfection phase, and the combination of processes must not impair the disinfection efficacy.
Chemical Disinfection Process
The standard specifies that the chemical disinfection process must be validated to achieve at least a 5-log reduction of relevant microorganisms under defined conditions, including Enterococcus hirae, Pseudomonas aeruginosa, and Staphylococcus aureus. The process parameters—temperature, concentration of disinfectant, and contact time—must be monitored and controlled. Unlike thermal disinfection where A₀ values are used, the standard requires that the chemical disinfectant’s efficacy be proven through quantitative suspension tests and carrier tests performed under clean and dirty conditions.
| Parameter | Typical Range | Validation Requirement |
|---|---|---|
| Disinfectant concentration | 0.05% – 2% (peracetic acid, aldehydes, OPA, etc.) | Monitored each cycle; tolerance as per manufacturer |
| Temperature | 40–65 °C (disinfectant-dependent) | Stable within ±1 °C during contact phase |
| Contact time | 5–30 minutes (biocidal activity proven) | Achieve ≥5-log reduction for bacteria; ≥4-log for fungi |
| Cleaning efficacy | Test per ISO 15883-5 | Residual protein ≤6.4 µg/cm² or equivalent |
| Rinse water quality | Potable water or better | Final rinse with microbial quality ≤10 CFU/mL |
Controls and Monitoring
The washer-disinfector must be equipped with sensors and controllers to ensure that critical parameters (disinfectant concentration, temperature, time, flow rate, and dosing) are maintained within validated limits. The standard requires a printed record or digital log for each cycle, including any deviations. Additionally, the system must prevent restart of a cycle if critical alarms are not resolved.
Implementation Considerations
Healthcare facilities must perform initial validation and periodic requalification of their washer-disinfectors. For chemical disinfection, special attention is required for:
- Selection of compatible disinfectants that are CE-marked and approved for use in washer-disinfectors
- Calibration and accuracy of dosing systems
- Material compatibility: some chemicals may damage plastics, coatings, or elastomers over time
- Adequate rinsing cycles to remove chemical residues, preventing patient or user skin reactions
- Operator training on chemical handling and machine operation
Tip: Engage with the disinfectant manufacturer early in the validation process to confirm optimal parameters and stability in the machine environment.
Warning: Inadequate rinsing can leave harmful chemical residues on non-critical devices. The standard requires at least one final rinse with potable water, and documented verification of residue levels is recommended.
Compliance and Auditing
To claim compliance with ISO 15883-7:2017, manufacturers of washer-disinfectors must provide evidence of type testing and performance validation. Users (healthcare facilities) should ensure that their equipment is installed, validated, and maintained according to the manufacturer’s specifications and this standard. Internal audits should review cycle records, maintenance logs, and operator training certifications. For facilities subject to regulatory inspection, demonstrating adherence to the standard can reduce risk and support accreditation.
Note: The Canadian adoption CAN CSA ISO 15883-7:17 is identical to ISO 15883-7:2017, with no national modifications. Thus, compliance with the ISO version ensures Canadian regulatory alignment.
Success: Implementing ISO 15883-7:2017 ensures safe, effective, and reproducible reprocessing of heat-sensitive non-critical devices, reducing healthcare-associated infections (HAIs) and improving patient safety.
Danger: Never change disinfectant product, concentration, or contact time without a complete revalidation. Unverified modifications can result in disinfection failure and lead to cross-contamination outbreaks.
Frequently Asked Questions
Q: What is the difference between ISO 15883-6 and ISO 15883-7?
A: ISO 15883-6 covers thermal disinfection of non-invasive, non-critical devices, while ISO 15883-7 covers chemical disinfection for the same types of items. Part 7 is used when devices cannot withstand the high temperatures required for thermal disinfection (e.g., certain plastics, electronic components).
A: ISO 15883-6 covers thermal disinfection of non-invasive, non-critical devices, while ISO 15883-7 covers chemical disinfection for the same types of items. Part 7 is used when devices cannot withstand the high temperatures required for thermal disinfection (e.g., certain plastics, electronic components).
Q: Can chemical disinfection in a washer-disinfector replace manual cleaning?
A: The standard requires an automatic cleaning phase (typically using water and detergent) prior to chemical disinfection. If the washer-disinfector’s cleaning efficacy is validated according to ISO 15883-5, manual cleaning is not necessary for the tested load types.
A: The standard requires an automatic cleaning phase (typically using water and detergent) prior to chemical disinfection. If the washer-disinfector’s cleaning efficacy is validated according to ISO 15883-5, manual cleaning is not necessary for the tested load types.
Q: How is the efficacy of the chemical disinfection process validated?
A: Validation uses quantitative carrier tests with representative microorganisms (bacteria and fungi). The process must achieve at least a 5-log reduction for bacteria and a 4-log reduction for fungi under both clean and dirty conditions. Disinfectant efficacy must be proven at the verified concentration, temperature, and contact time.
A: Validation uses quantitative carrier tests with representative microorganisms (bacteria and fungi). The process must achieve at least a 5-log reduction for bacteria and a 4-log reduction for fungi under both clean and dirty conditions. Disinfectant efficacy must be proven at the verified concentration, temperature, and contact time.
Q: What is the significance of the CSA adoption CAN CSA ISO 15883-7:17?
A: CAN CSA ISO 15883-7:17 is the Canadian national adoption of ISO 15883-7:2017, making the standard officially recognized in Canada. It carries the same technical content and can be used as evidence of compliance with Canadian healthcare reprocessing requirements.
A: CAN CSA ISO 15883-7:17 is the Canadian national adoption of ISO 15883-7:2017, making the standard officially recognized in Canada. It carries the same technical content and can be used as evidence of compliance with Canadian healthcare reprocessing requirements.