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Indoor and Built Environment, Vol. 15, No. 4,
315-331 (2006)
DOI: 10.1177/1420326X06067802
The Integrated Effect of Medical Lamp Position and Diffuser Discharge Velocity on Ultra-clean Ventilation Performance in an Operating Theatre
T. T. Chow
Division of Building Science and Technology, City University of Hong Kong, Hong Kong SAR, bsttchow{at}cityu.edu.hk
Zhang Lin
Division of Building Science and Technology, City University of Hong Kong, Hong Kong SAR
Wei Bai
Division of Building Science and Technology, City University of Hong Kong, Hong Kong SAR
The ventilation system of an operating theatre (OT) in a hospital needs to provide a comfortable and healthy surgical environment, particularly to minimise the risk of airborne infection. Engineering standards are available to outline specialised ventilation design and installation requirements based on knowledge accumulated from quality research and day-to-day practices. In this paper, the integrated effect of a reduction in supply air velocity and changed medical lamp positions on the ultra-clean ventilation performance of a standard OT environment is reported. The dispersion of infectious particles from both the surgical team and the patient were examined through computational fluid dynamic analysis. It was observed that variations in supply velocity and medical lamp configuration will only slightly affect the thermal comfort environment. However, they could have a serious effect on the movement of infectious particles and hence increase the cross infection risk.
Key Words: Operating theatre • CFD • Indoor airflow • Building ventilation
References
- National Health Service Estates: Health Technical memorandum 2025, Ventilation in Healthcare Premises. London, HMSO , 1994.
- Charnley J: Postoperative infection after total hip replacement with special reference to air contamination in the operating room : Clin Orthop Related Res 1972;87: 167-187 .[CrossRef][Medline]
[Order article via Infotrieve]
- Whyte W, Lidwell OM, Lowbury EJL, Blowers R: Suggested bacteriological standards for air in ultraclean operating room : J Hospital Infection 1983;4: 133-139 .[CrossRef][ISI][Medline]
[Order article via Infotrieve]
- Woods JE, Reynolds GL, montag GM, Braymen DT, Rasmussen RW: Ventilation requirements in hospital operating rooms - Part 1: Control of Airborne Particles (RP- 202) : ASHRAE Trans 1986;92(2A): 396-426 .
- Kruppa B, Ruden H: The influence of various air exchange rates on airborne particles and microorganisms in conventionally ventilated operating room : Indoor Air 1996;6: 93-100 .[CrossRef]
- Friberg B, Lindgrenm, Karlsson C, Bergstrom A, Friberg S: mobile zoned/exponential LAF screen: a new concept in ultra-clean air technology for additional operating room ventilation : J Hospital Infection 2002;50(4): 286-292 .
- Persson M, van der Linden J: Wound ventilation with ultra-clean air for prevention of direct airborne contamination during surgery : Infection Control Hospital Epidemiol 2004;25(4): 297-301 .
- Kant IJ, van Rijssen-Mollm, Borm PJA: Simulation of nitrous oxide concentrations in operating and recovery rooms : Ann Occup Hyg 1990;34(6): 575-583 .[Abstract/Free Full Text]
- Chen Q, Jiang Z, Moser A: Control of airborne particle concentration and draught risk in an operating room : Indoor Air 1992;2: 154-167 .[CrossRef]
- Buchanan CR, Dunn-Rankin D: Transport of surgically produced aerosols in an operating room : AIHA J 1998;59(6): 393-402 .[CrossRef]
- Colquhoun J, Partridge L: Computational fluid dynamics applications in hospital ventilation design : Indoor Built Environ 2003;12: 81-88 .
- Woloszyn M, Virgone J, Melen S: Diagonal air-distribution system for operating rooms: experiment and modelling : Building Environ 2004;39: 1171-1178 .[CrossRef]
- Chow TT, Yang XY: Performance of ventilation system in a non-standard operating room : Building Environ 2003;38: 1401-1411 .
- Chow TT, Lin Z, Yang XY: Study of air infection risk in operating theatre : Healthy Buildings 2003 2003;3: 643-648 .
- DIN 4799: Heating, ventilation and air conditioning - testing of air distribution systems serving operating theatres. Berlin, Beuth verlag , 1990.
- Zamunar N: Operating room environment with turbulent airflow. ASHRAE Technical Data Bulletin - Hospital and Operating Room Ventilation. Atlanta , 1986, pp. 101-107.
- Noble WC: Dispersal of bacteria from human skin . Proc. International Symposium on Contamination Control, Copenhagen, Denmark, 1976, pp. 16-24 .
- Patankar SV: Numerical heat transfer and fluid flow. Washington, DC, Hemisphere , 1980.
- Launder BE, Spalding DB: The numerical computation of turbulent flows : Computer methods Appl Mech Engineer 1974;3: 269-289 .
- Fluent Inc: User’s Guide for FLUENT 6.1, Lebanon, USA , 2003.
- ISO Standard 7730: moderate thermal environment - determination of the PMV and PPD indices and specification of the conditions for the thermal comfort. International Standard Organization, Geneva , 1990.
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