Application of precise gas injection time in the evaluation of drying effect of soft endoscopic lumens
OBJECTIVE To investigate the time to achieve effective drying during the cyclic use of soft endoscopes with different lengths and clamp diameters.MERHODS Seven different models of endoscopes in the Digestive En-doscopy Center of the First Affiliated Hospital of Zhejiang University School of Medicine from Jan.2022 to Jan.2024 were selected,and 30 endoscopes were observed in each drying time group of each model,and the number of droplets inside the tubes of soft endoscopes and the diameter of the largest droplet were observed by using an elec-tronic endoscope.The soft endoscopes in each time group were also categorized according to whether or not the water droplets were observed,and the differences in endoscopic drying effects of different time groups were com-pared with those of the same models.RESULTS For an endoscope with a biopsy tube diameter of 2mm and a length of 1 m,no water droplets were found for 1 minute of gas injection.For an endoscope with a biopsy tube di-ameter of 2.8 mm and a length of 1 m,no water droplets were found for 2 minutes of gas injection.For an endo-scope with a biopsy tube diameter of 3.2 mm and a length of 1 m,no water droplets were found for 3 minutes of gas injection.For the biopsy tube with a diameter of 3.2 mm and a length of 1.3 m,no water droplets were found for 3.5 minutes of endoscopic gas injection.For an endoscope with a biopsy tube diameter of 3.2 mm and a length of 1.6 m,no water droplets were found for 4 minutes of gas injection.For an endoscope with a biopsy tube diame-ter of 3.7 mm and a length of 1.3 m,no water droplets were found for 4 minutes of gas injection.For an endo-scope with a biopsy tube diameter of 3.7 mm and a length of 1.6 m,no water droplets were found for 5.5 minutes of gas injection.CONCLUSIONS Based on the observation results of the endoscope in this experiment,it is recom-mended that the gas injection time for the endoscope with a biopsy tube diameter of 2 mm and a length of lm should not be less than 1 minute.The biopsy tube diameter is 2.8 mm,and the endoscopic gas injection time for a length of lm is not less than 2 minutes.The biopsy tube diameter is 3.2 mm long,and the endoscopic gas injec-tion time for a length of 1m is not less than 3 minutes.The biopsy tube diameter is 3.2 mm long,and the endo-scopic gas injection time for a length of 1.3 m is not less than 3.5 min.The biopsy tube diameter is 3.2 mm,the length of the endoscope and biopsy tube diameter is 3.7,and the injection time of the endoscope with a length of 1.3 is not less than 4 minutes.The biopsy tube diameter is 3.7 mm in length and the endoscopic gas injection time for a 1.6 m length is not less than 5.5 min.
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