Abstract: Objective To explore the influence of anesthesia machine disinfector on the incidence of pipeline microorganism and pulmonary infection, so as to provide basis for future clinical application. Methods The 20 anesthesia machines used in Yueqing People's Hospital from March 2020 to March 2022 were selected as the research objects. The anesthesia machines were divided into experimental group and control group with 10 in each group by random number method. The experimental group was disinfected with an anaesthetic machine disinfector. The control group was disinfected with routine disinfection procedures. The sampling site, sampling time, microbial monitoring methods and postoperative pulmonary infection rate of patients were statistically analyzed. Results There was a significant difference between the two groups in the detection results of gram-positive bacteria, gram-negative bacteria and fungi (P<0.05). The monitoring sites of the number of positive bacterial culture cases were compared. The monitoring samples were taken at the expiratory end, the outlet of the soda lime tank, the inlet of the soda lime pipe, the inside of the bellows, the one-way valve at the inspiratory end, the inspiratory end, and the one-way valve at the expiratory end. The difference between the two groups was statistically significant (P<0.05). After operation, the incidence of pulmonary infection in the experimental group was lower than that in the control group, with a statistically significant difference (P<0.05). Conclusion The disinfection method of anesthesia machine disinfector can reduce the residual amount of microorganisms in the respiratory pipeline, and the standardized disinfection method of the respiratory circuit can well reduce the incidence of pulmonary infection, which is worthy of clinical promotion.

Key words: anaesthesia machine sterilizer, respiratory circuit in anesthesia machine, microorganism, pulmonary infection.