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INFECTION CONTROL


Disinfection technology that can complement ICRA in renovation work It was found that there is a problem by examining the renovation work from the viewpoint of infection control. The ICRA requires sealing the work area, but this is not always possible. For example, if the ceiling is continuous with the ceiling of the adjacent patient area, it may not be possible to create a temporary wall in the ceiling cavity for construction preparation. Even in such cases, the risk of


scattering Aspergillus can be reduced by disinfecting the ceiling cavity in advance by chemical spraying. The ICRA is an effective assessment tool to prevent dust leakage outside the renovation area. However, the use of chemical mist spray technology represents a transformative approach – it makes more sense to disinfect the Aspergillus spores before dust scatters.


Application of disinfection technology to large-scale demolition work At the Fujita Health University Hospital, concerns were raised that Aspergillus spores had the potential to invade the ward or ICU during construction of a new ward and renovation of existing buildings. Sealing and negative pressure control of the construction area was impossible. In addition, the restriction of the openings of the adjacent building windows and the filtering of the air intake could not completely prevent the infestation of Aspergillus spores. Therefore, it was decided to disinfect the ceiling cavity of the building before demolition to reduce the risk of infection for hospitalised patients. At the beginning of the demolition


work, we disinfected around 52,000 square metres of the ceiling cavity of the existing building. Due to the need for


Hospital ward South South-south-west South South-south-west South-south-east South-east South-west South-west West-south-west West-south-west


Year/month/day/time Direction 2018/4/1 11:00 2018/4/1 13:00 2018/4/1 15:00


West-south-west South-south-west South


Annual wind direction data analysis In the daytime from 09:00 to 17:00 32.6% effect


Demolition building


Verification of wind direction.


rapid disinfection work within limited processes, we developed a device that enabled disinfection at four locations simultaneously using a large compressor. As a result, the disinfection work could be completed in around one month.


Conclusion Ultimately, disinfecting the ceiling cavity where large amounts of aspergillus fungus live can significantly reduce the infection risk. Chemical mist spray can help reduce the risk of infection by complementing conventional measures to prevent the scattering of dust, such as sealing of the renovation work area and maintaining negative pressure. Spraying with a two- fluid spray nozzle allows for cost-effective disinfection, by using the minimum amount of hypochlorous acid aqueous solution required and distributing it to every corner of the ceiling cavity. The chemical is designated as a food additive and, by properly controlling the


concentration of the solution, the health of workers undertaking the disinfection process is also protected.


The next deployment This technology was adopted for demolition work at Takamatsu Red Cross Hospital and for renovation and demolition work at Fujita Health University Hospital. We are promoting further technical improvements based on each experience. Even in the United States, where ICRA has already spread, we anticipate further uptake of the technology to enable increased risk reduction. We have already begun to disseminate the benefits of this technology in the United States to help prevent infection in hospital construction work.


Hospital projects often involve


renovation and demolition work, and we plan to widely propose this technology.


IFHE


References 1 Guidelines for Infection Control in University Hospitals, 2nd Edn (Edited by the Japan Infection Prevention and Control Conference for National and Public University Hospitals), p82.


2 Mitsuda T. The importance of preventing aspergillosis in susceptible patients and assessing risks to prevent infection. Infection Control 2009; Vol. 18.


3 Kohno S. The Journal of the Japanese Society of Internal Medicine, the 100th Anniversary of the Society’s foundation, October 10, 2002.


4 Yotsumoto M et al. Identification of indoor microorganisms using DNA sequence analysis. Abstracts of Annual Meeting of the Architectural Institute of Japan, 2010.


Disinfectant fogging cart for demolition work.


IFHE DIGEST 2020


During installation of the spray nozzle on the ceiling inspection port.


5 Yotsumoto M et al. Development of disinfection technology using two fluid spray nozzles – Aspergillosis measures in hospital demolition work. Abstracts of Annual Meeting of the Architectural Institute of Japan, 2017.


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2018/4/2 13:00 2018/4/2 14:00 2018/4/3 09:00 2018/4/3 12:00 2018/4/3 16:00 2018/4/3 17:00 2018/4/4 12:00 2018/4/4 13:00 2018/4/4 14:00


South South


West-south-west West-south-west South


West-south-west West-south-west West-south-west West-south-west


Meteorological Agency Data


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