Disinfection of corrugated tubing by ozone and ultrasound in mechanically ventilated tracheostomized patients

作者：Lopes M S; Ferreira J R F; da Silva K B; de Oliveira Bacelar Simplicio I; de Lima C J; Fernandes A B^*

来源：Journal of Hospital Infection, 2015, 90(4): 304-309.

DOI：10.1016/j.jhin.2015.03.004

• Decontamination
• Disinfection
• Ozone
• Semi-critical material
• Ultrasound

Background: Medical equipment coming into contact with non-intact skin or mucous membranes is classified as semi-critical material. This equipment requires at least high-level disinfection, as the major risk in all invasive procedures is the introduction of pathogenic microbes causing hospital-associated infections.
Aim: To evaluate the capacity of ozone gas and ultrasound to disinfect semi-critical, thermally sensitive material.
Methods: Used corrugated tubing from mechanically ventilated tracheostomized patients in the intensive care unit was obtained. Enzymatic detergent was applied for 15 min before different disinfection techniques were evaluated as follows: Group A (0.2% peracetic acid); Group B (ultrasound for 60 min); Group C (application of ozone gas at a concentration of 33 mg/L for 15 min); Group D (ultrasound for 30 min and ozone for 15 min); Group E (ultrasound for 60 min and ozone for 15 min).
Findings: Application of ultrasound for 60 min reduced the level of microbial contamination by 4 log(10), whereas ozone alone and the other two combined techniques (ultrasound and ozone) and the peracetic acid reduced the level of microbial contamination by 5 log10.
Conclusion: Ozone was the most advantageous technique taking into consideration processing time, ease of use, effectiveness, and cost. The use of ozone gas to disinfect semi-critical material proved to be technically feasible and extremely promising.

• 出版日期2015-8