Nosocomial infections (HAI) are one of the most serious problems in modern medicine. According to WHO, 7-10% of hospitalized patients in developed countries and up to 25% in developing countries are infected. Ozonation is an effective method to combat this problem, ensuring pathogen destruction at 99.99%.
Unlike chemical disinfectants, ozone leaves no toxic residues, does not cause resistance in microorganisms, and decays to pure oxygen within 20-30 minutes after treatment. This is especially important for patients with weakened immunity.
The problem of nosocomial infections
Nosocomial infections increase hospitalization time by an average of 8-10 days, increase treatment costs and increase mortality. Main sources of HAI:
- Contact surfaces: beds, bedside tables, handrails, call buttons
- Medical equipment: monitors, catheters, breathing circuits
- Air environment: aerosol particles from coughing, sneezing, medical procedures
- Ventilation and air conditioning systems
- Textiles: bed linens, curtains, gowns
Ozonation of operating blocks
Operating blocks require special sanitary regimes. Traditional cleaning with disinfectants cannot ensure treatment of all surfaces — ozone, being a gas, penetrates equipment crevices, ventilation systems, hard-to-reach areas behind devices.
| Treatment type | Concentration | Treatment time | Frequency |
|---|---|---|---|
| Between operations | 10-15 mg/m³ | 30-40 min | After each operation |
| Final disinfection | 20-25 mg/m³ | 60-90 min | At end of workday |
| After infectious cases | 30-40 mg/m³ | 120 min | As indicated |
| Preventive | 10 mg/m³ | 60 min | Weekly |
Disinfection of wards and ICUs
Intensive care and resuscitation wards are zones with increased risk of infection transmission between patients. The most vulnerable categories are here: patients on mechanical ventilation, after surgery, with immunodeficiency.
Room preparation
Removal of patients (if possible) or use of isolated zones. Closing windows and doors, turning off supply ventilation.
Ozonation
Turning on the ozonator for the calculated time. Concentration of 15-20 mg/m³ ensures destruction of most pathogens.
Exposure
Maintaining the set concentration for 30-60 minutes for complete disinfection of all surfaces.
Ventilation
Opening ventilation, airing the room until ozone concentration drops below MAC (0.1 mg/m³).
Effectiveness against pathogens
Ozone destroys almost all types of pathogenic microorganisms found in healthcare facilities:
| Microorganism | Inactivation time | Efficiency |
|---|---|---|
| Staphylococcus aureus (MRSA) | 10-15 min | 99.99% |
| Escherichia coli | 5-10 min | 99.99% |
| Pseudomonas aeruginosa | 15-20 min | 99.99% |
| Candida albicans | 15-20 min | 99.9% |
| Aspergillus niger (spores) | 30-40 min | 99.9% |
| Clostridium difficile (spores) | 40-60 min | 99.9% |
| Influenza viruses | 5-10 min | 99.99% |
| Coronaviruses | 10-15 min | 99.99% |
Comparison of disinfection methods
Ozonation vs traditional methods
| Parameter | Ozonation | Chemical disinfection |
|---|---|---|
| Surface coverage | 100% (including hard-to-reach) | 70-80% (only accessible) |
| Toxic residues | No (decays to O₂) | Yes (require rinsing) |
| Bacterial resistance | Not formed | Forms with frequent use |
| Air treatment | Yes (air disinfection) | No |
| Need for cleaning after | No | Yes (wiping, rinsing) |
| Safety for staff | Yes (with proper protocol) | Risk of allergies and irritation |
Advantages of ozonation in medicine
No resistance
Ozone acts on cell membranes — bacteria cannot develop resistance
Full coverage
Gas penetrates everywhere: into crevices, behind equipment, into ventilation, under furniture
No residues
Decays to oxygen — no rinsing required, safe for patients
Compliance with regulations
Method recommended by Russian sanitary standards for healthcare facilities
Safety requirements
When ozonating medical premises, safety requirements must be observed:
- Treatment is carried out in the absence of people and animals
- The room must be sealed during treatment
- Staff working with ozonators must undergo training
- After treatment — mandatory ventilation to MAC (0.1 mg/m³)
- Use of ozone concentration sensors is recommended
- Keeping a treatment log for control and reporting