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Quality Control of Medical Instruments and Cleaning Water Hirobumi NAKAYAMA 1 , Kimiyuki KAWAGUCHI 1 , Akihito KATO 2 , Hiroyuki MORISHIMA 1 , Goro NAGASHIMA 1 , Setsuko YAGIOKA 3 , Takeshi ASAKURA 3 , Shinichi TANAKA 4 , Yuichiro TANAKA 5 1Department of Neurosurgery, St. Marianna University Kawasaki Municipal Tama Hospital, St. Marianna University School of Medicine 2Medical Emergency and Disaster Center, St. Marianna University Kawasaki Municipal Tama Hospital, St. Marianna University School of Medicine 3Operating Room, St. Marianna University Kawasaki Municipal Tama Hospital, St. Marianna University School of Medicine 4Infection Control Team, St. Marianna University School of Medicine 5Department of Neurosurgery, St. Marianna University School of Medicine Keyword: surgical instrument , corrosion , reversed-osmosis(RO)water pp.845-850
Published Date 2019/8/10
DOI https://doi.org/10.11477/mf.1436204035

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 PURPOSE:Herein we aimed to investigate the degradation of surgical instruments in our hospital and how water quality affects the rate of metal corrosion.

 MATERIALS and METHODS:We observed 279 stainless steel instruments, and determined the presence of damage like metal corrosion or scale formation. We also measured the concentrations of chloride(Cl)and silicate(SiO44−)ions in the water used for cleaning in our operating rooms, including tap water from the city water supply and reverse-osmosis(RO)filtered water.

 RESULT:Pitting corrosion was observed on 71% of the instruments we investigated. The concentration of Cl was 0.7mg/L in tap water and 0.1mg/L in RO water, while the concentration of SiO44− was 0.3mg/L in both the tap and RO water.

 DISCUSSION:Of the dissolved ions Cl and SiO44−, Cl is more of a concern, as it causes pitting corrosion over time, while SiO44− causes scale formation. Considering the typical water quality in the operating-room environment, degradation must be monitored for the general maintenance of metal surgical instruments.


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電子版ISSN 1882-1251 印刷版ISSN 0301-2603 医学書院

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