医療行為中を想定した手術室の空気環境予測技術
手術室の清浄度管理は感染症防止の観点から重要である。一般的に病院手術室では竣工時の性能検査によって無負荷時の空気環境が確認されているが、実運用段階での医療行為中の空気環境を詳細に測定した例はほとんどない。そこで、模擬手術を行い運用段階の手術室空気環境の実測を通じ医療行為中の空気環境を明らかにした。さらに、熱流体解析（CFDシミュレーション）によって手術中の手術室空気環境を予測し、空気環境の見える化を図った。また、主な発塵源である手術衣を着用した人体からの発塵量を人体部位別に明らかにして境界条件とした。その結果、従来の点発塵を想定した一般的な方法よりも精度よく手術中の空気環境を予測することが可能になった。
Prediction Systems of Air Environmental Performance for Operating Rooms during Surgery
Control of cleanliness is very important to prevent surgical site infections*1 in operating rooms. Air environmental performance of an operating room is usually checked As-Built*2 state and rarely checked Operational*3 state. In order to clarify the environmental performance in operating rooms during surgery （Operational*3 state）, these performances were measured with mock surgery after an operating room began to be used. Air environmental performance during surgery is visualized by using CFD simulation system. Particle generation from each part of human body wearing surgical suit was made clear. CFD simulation system using these results as boundary conditions can predict air environmental performance during surgery more precisely than that using particle generation from one point of human body as a boundary condition.
*1 Surgical Site Infections: Infections that occurs after surgery in the part of the body where the surgery took place.
*2 As-Built: The condition where the installation is complete with all services connected and functioning, but with no production equipment, materials or personnel present. As-built classification can only be done once, when the room is built and before bringing in the equipment.
*3 Operational: The condition where the installation is functioning in the specified manner, with the specified number of personnel present and working in the manner agreed upon.
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