To explore the cleaning agent residue, cleaning quality and cleaning efficiency of three kinds of ophthalmic micro instrument cleaning methods.

A total of 12 000 pieces of ophthalmic micro instruments contaminated in the First Affiliated Hospital with Nanjing Medical University in March 2018 were collected. They were divided into groups A, B, and C by block randomization method, with 4 000 instruments in every group. Group A selected decompression boiling cleaning, group B selected automatic cleaning sterilizer cleaning and group C selected manual cleaning with ultrasonic machine cleaning. The cleaning effect was evaluated by visual inspection, magnifying glass with light source and ATP bioluminescence test. The cleaning agent residue was monitored by detecting the change of conductivity in pure water before and after cleaning. At the same time, required time for instrument processing of three groups were recorded to evaluate cleaning efficiency.

The results of the conductivity test of cleaning methods in three groups showed that no cleaning agent remained. The comparison of cleaning qualification rates of ATP detection method and the visual inspection method showed that the pass rates of A group were respectively 100.00% and 99.88%, those of group B were respectively 100.00% and 99.80 % and those of Group C were respectively 95.00% and 97.80%. There was no significant difference in cleaning quality and cleaning qualification rate between group A and group B (P>0.05) , but they were all higher than those of group C (P<0.01) . The comparison results of cleaning efficiency showed that the consumed time for each 500 instruments in group A was (86.04±6.60) min, that in group B was (147.36±14.60) min and that in group C was (241.50±22.41) min. The consumed time for group A was shorter than that of group B and group C, and consumed time for group B was shorter than that of group C. The differences were all statistically significant (P<0.01) .

No cleaning agent remains in the three cleaning methods, but the use of decompression boiling cleaning and automatic cleaning sterilizer cleaning can effectively ensure the cleaning quality. At the same time, decompression boiling cleaning takes less time and is more efficient than automatic cleaning sterilizer cleaning.

Ophthalmology; Micro instrument; Disinfection supply center; Cleaning method; Decompression boiling cleaning; Automatic cleaning; Manual cleaning with ultrasonic machine cleaning; Effect